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Entry
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- #109150 - MACHADO-JOSEPH DISEASE; MJD
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- OMIM
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<p>
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<span class="h4">#109150</span>
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<br />
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<strong>Table of Contents</strong>
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<a href="#title"><strong>Title</strong></a>
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<a href="#phenotypeMap"><strong>Phenotype-Gene Relationships</strong></a>
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<a href="/clinicalSynopsis/109150"><strong>Clinical Synopsis</strong></a>
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<a href="/phenotypicSeries/PS164400"> <strong>Phenotypic Series</strong> </a>
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<a href="#text"><strong>Text</strong></a>
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<a href="#description">Description</a>
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<a href="#clinicalFeatures">Clinical Features</a>
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<a href="#otherFeatures">Other Features</a>
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<a href="#inheritance">Inheritance</a>
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<a href="#diagnosis">Diagnosis</a>
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<a href="#mapping">Mapping</a>
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<a href="#molecularGenetics">Molecular Genetics</a>
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<a href="#genotypePhenotypeCorrelations">Genotype/Phenotype Correlations</a>
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<a href="#pathogenesis">Pathogenesis</a>
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<a href="#populationGenetics">Population Genetics</a>
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<a href="#history">History</a>
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<a href="#animalModel">Animal Model</a>
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<a href="#seeAlso"><strong>See Also</strong></a>
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<a href="#references"><strong>References</strong></a>
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<a href="#contributors"><strong>Contributors</strong></a>
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<a href="#creationDate"><strong>Creation Date</strong></a>
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<a href="#editHistory"><strong>Edit History</strong></a>
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<div style="display: table-cell;">External Links</div>
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</h4>
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<div><a href="https://clinicaltrials.gov/search?cond=MACHADO-JOSEPH DISEASE" class="mim-tip-hint" title="A registry of federally and privately supported clinical trials conducted in the United States and around the world." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Clinical Trials', 'domain': 'clinicaltrials.gov'})">Clinical Trials</a></div>
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<div><a href="#mimEuroGentestFold" id="mimEuroGentestToggle" data-toggle="collapse" class="mim-tip-hint mimTriangleToggle" title="A list of European laboratories that offer genetic testing."><span id="mimEuroGentestToggleTriangle" class="small" style="margin-left: -0.8em;">►</span>EuroGentest</div>
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<div id="mimEuroGentestFold" class="collapse">
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<div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=20359&Typ=Pat" title="Machado-Joseph disease type 1" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">Machado-Joseph disease typ… </a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=20360&Typ=Pat" title="Machado-Joseph disease type 2" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">Machado-Joseph disease typ… </a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=20361&Typ=Pat" title="Machado-Joseph disease type 3" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">Machado-Joseph disease typ… </a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=13774&Typ=Pat" title="Spinocerebellar ataxia type 3" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">Spinocerebellar ataxia typ… </a></div>
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</div>
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<div><a href="#mimGeneReviewsFold" id="mimGeneReviewsToggle" data-toggle="collapse" class="mim-tip-hint mimTriangleToggle" title="Expert-authored, peer-reviewed descriptions of inherited disorders including the uses of genetic testing in diagnosis, management, and genetic counseling."><span id="mimGeneReviewsToggleTriangle" class="small" style="margin-left: -0.8em;">►</span>Gene Reviews</div>
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<div id="mimGeneReviewsFold" class="collapse">
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<div style="margin-left: 0.5em;"><a href="https://www.ncbi.nlm.nih.gov/books/NBK1138/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Gene Reviews', 'domain': 'ncbi.nlm.nih.gov'})">Hereditary Ataxia Overview</a></div><div style="margin-left: 0.5em;"><a href="https://www.ncbi.nlm.nih.gov/books/NBK1196/" title="Spinocerebellar Ataxia Type 3" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Gene Reviews', 'domain': 'ncbi.nlm.nih.gov'})">Spinocerebellar Ataxia Typ…</a></div>
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</div>
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<div><a href="https://www.diseaseinfosearch.org/x/6762" class="mim-tip-hint" title="Network of disease-specific advocacy organizations, universities, private companies, government agencies, and public policy organizations." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Genetic Alliance', 'domain': 'diseaseinfosearch.org'})">Genetic Alliance</a></div>
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<div><a href="https://medlineplus.gov/genetics/condition/spinocerebellar-ataxia-type-3" class="mim-tip-hint" title="Consumer-friendly information about the effects of genetic variation on human health." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MedlinePlus Genetics', 'domain': 'medlineplus.gov'})">MedlinePlus Genetics</a></div>
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<div><a href="https://www.ncbi.nlm.nih.gov/gtr/all/tests/?term=109150[mim]" class="mim-tip-hint" title="Genetic Testing Registry." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GTR', 'domain': 'ncbi.nlm.nih.gov'})">GTR</a></div>
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<div><a href="#mimOrphanetFold" id="mimOrphanetToggle" data-toggle="collapse" class="mim-tip-hint mimTriangleToggle" title="European reference portal for information on rare diseases and orphan drugs."><span id="mimOrphanetToggleTriangle" class="small" style="margin-left: -0.8em;">►</span>Orphanet</div>
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<div id="mimOrphanetFold" class="collapse">
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<div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=276238" title="Machado-Joseph disease type 1" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">Machado-Joseph disease typ…</a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=276241" title="Machado-Joseph disease type 2" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">Machado-Joseph disease typ…</a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=276244" title="Machado-Joseph disease type 3" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">Machado-Joseph disease typ…</a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=98757" title="Spinocerebellar ataxia type 3" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">Spinocerebellar ataxia typ…</a></div>
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<div style="display: table-cell;">Animal Models</div>
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<div class="panel-body small mim-panel-body">
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<div><a href="https://www.alliancegenome.org/disease/DOID:1440" class="mim-tip-hint" title="Search Across Species; explore model organism and human comparative genomics." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Alliance Genome', 'domain': 'alliancegenome.org'})">Alliance Genome</a></div>
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<div><a href="http://www.informatics.jax.org/disease/109150" class="mim-tip-hint" title="Phenotypes, alleles, and disease models from Mouse Genome Informatics." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MGI Mouse Phenotype', 'domain': 'informatics.jax.org'})">MGI Mouse Phenotype</a></div>
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<div><a href="https://omia.org/OMIA002473/" class="mim-tip-hint" title="Online Mendelian Inheritance in Animals (OMIA) is a database of genes, inherited disorders and traits in 191 animal species (other than human and mouse.)" target="_blank">OMIA</a></div>
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<div><a href="https://wormbase.org/resources/disease/DOID:1440" class="mim-tip-hint" title="Database of the biology and genome of Caenorhabditis elegans and related nematodes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Disease Ontology', 'domain': 'wormbase.org'})">Wormbase Disease Ontology</a></div>
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<div><a href="https://catalog.coriell.org/Search?q=OmimNum:109150" class="definition" title="Coriell Cell Repositories; cell cultures and DNA derived from cell cultures." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'CCR', 'domain': 'ccr.coriell.org'})">Coriell</a></div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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<span>
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<span class="mim-tip-bottom" qtip_title="<strong>Looking for this gene or this phenotype in other resources?</strong>" qtip_text="Select a related resource from the dropdown menu and click for a targeted link to information directly relevant.">
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</span>
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</span>
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</div>
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<div class="col-lg-8 col-lg-pull-2 col-md-8 col-md-pull-2 col-sm-8 col-sm-pull-2 col-xs-12">
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<div>
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<a id="title" class="mim-anchor"></a>
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<div>
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<a id="number" class="mim-anchor"></a>
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<div class="text-right">
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<a href="#" class="mim-tip-icd" qtip_title="<strong>ICD+</strong>" qtip_text="
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<strong>SNOMEDCT:</strong> 91952008<br />
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<strong>ORPHA:</strong> 276238, 276241, 276244, 98757<br />
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<strong>DO:</strong> 1440<br />
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">ICD+</a>
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</div>
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<div>
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<span class="h3">
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<span class="mim-font mim-tip-hint" title="Phenotype description, molecular basis known">
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<span class="text-danger"><strong>#</strong></span>
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109150
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</span>
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</span>
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</div>
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</div>
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<div>
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<a id="preferredTitle" class="mim-anchor"></a>
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<h3>
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<span class="mim-font">
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MACHADO-JOSEPH DISEASE; MJD
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</span>
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</h3>
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</div>
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<div>
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<br />
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</div>
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<div>
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<a id="alternativeTitles" class="mim-anchor"></a>
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<div>
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<p>
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<span class="mim-font">
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<em>Alternative titles; symbols</em>
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</span>
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</p>
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</div>
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<div>
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<h4>
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<span class="mim-font">
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SPINOCEREBELLAR ATAXIA 3; SCA3<br />
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SPINOCEREBELLAR ATROPHY III<br />
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AZOREAN NEUROLOGIC DISEASE<br />
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SPINOPONTINE ATROPHY<br />
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NIGROSPINODENTATAL DEGENERATION
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</span>
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</h4>
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</div>
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</div>
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<div>
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<br />
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</div>
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</div>
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<div>
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<a id="phenotypeMap" class="mim-anchor"></a>
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<h4>
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<span class="mim-font">
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<strong>Phenotype-Gene Relationships</strong>
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</span>
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</h4>
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<div>
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<table class="table table-bordered table-condensed table-hover small mim-table-padding">
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<thead>
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<tr class="active">
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<th>
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Location
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</th>
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<th>
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Phenotype
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</th>
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<th>
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Phenotype <br /> MIM number
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</th>
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<th>
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Inheritance
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</th>
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<th>
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Phenotype <br /> mapping key
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</th>
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<th>
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Gene/Locus
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</th>
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<th>
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Gene/Locus <br /> MIM number
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</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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<span class="mim-font">
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<a href="/geneMap/14/466?start=-3&limit=10&highlight=466">
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14q32.12
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</a>
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</span>
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</td>
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<td>
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<span class="mim-font">
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Machado-Joseph disease
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</span>
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</td>
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<td>
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<span class="mim-font">
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<a href="/entry/109150"> 109150 </a>
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</span>
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</td>
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<td>
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<span class="mim-font">
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<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
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</span>
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</td>
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<td>
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<span class="mim-font">
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<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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</span>
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</td>
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<td>
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<span class="mim-font">
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ATXN3
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</span>
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</td>
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<td>
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<span class="mim-font">
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<a href="/entry/607047"> 607047 </a>
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</span>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div>
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<div class="btn-group ">
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<a href="/clinicalSynopsis/109150" class="btn btn-warning" role="button"> Clinical Synopsis </a>
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<button type="button" id="mimPhenotypicSeriesToggle" class="btn btn-warning dropdown-toggle mimSingletonFoldToggle" data-toggle="collapse" href="#mimClinicalSynopsisFold" onclick="ga('send', 'event', 'Unfurl', 'ClinicalSynopsis', 'omim.org')">
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<span class="caret"></span>
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<span class="sr-only">Toggle Dropdown</span>
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</button>
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</div>
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<div class="btn-group">
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<a href="/phenotypicSeries/PS164400" class="btn btn-info" role="button"> Phenotypic Series </a>
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<button type="button" id="mimPhenotypicSeriesToggle" class="btn btn-info dropdown-toggle mimSingletonFoldToggle" data-toggle="collapse" href="#mimPhenotypicSeriesFold" onclick="ga('send', 'event', 'Unfurl', 'PhenotypicSeries', 'omim.org')">
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<span class="caret"></span>
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<span class="sr-only">Toggle Dropdown</span>
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</button>
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</div>
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<div class="btn-group">
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<button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
|
|
PheneGene Graphics <span class="caret"></span>
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</button>
|
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<ul class="dropdown-menu" style="width: 17em;">
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<li><a href="/graph/linear/109150" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
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<li><a href="/graph/radial/109150" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Radial'})"> Radial </a></li>
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</ul>
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</div>
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<span class="glyphicon glyphicon-question-sign mim-tip-hint" title="OMIM PheneGene graphics depict relationships between phenotypes, groups of related phenotypes (Phenotypic Series), and genes.<br /><a href='/static/omim/pdf/OMIM_Graphics.pdf' target='_blank'>A quick reference overview and guide (PDF)</a>"></span>
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<div>
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<p />
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</div>
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<div id="mimClinicalSynopsisFold" class="well well-sm collapse mimSingletonToggleFold">
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<div class="small" style="margin: 5px">
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<div>
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<div>
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<span class="h5 mim-font">
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<strong> INHERITANCE </strong>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<div>
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<span class="mim-font">
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- Autosomal dominant <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/263681008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">263681008</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/771269000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">771269000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0443147&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0443147</a>, <a href="https://bioportal.bioontology.org/search?q=C1867440&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1867440</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span><br />
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</span>
|
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</div>
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</div>
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</div>
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<div>
|
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<div>
|
|
<span class="h5 mim-font">
|
|
<strong> HEAD & NECK </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
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<div>
|
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<div>
|
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<span class="h5 mim-font">
|
|
<em> Eyes </em>
|
|
</span>
|
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</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Gaze-evoked nystagmus <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/1220537002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">1220537002</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C5574666&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5574666</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000640" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000640</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000640" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000640</a>]</span><br /> -
|
|
External ophthalmoplegia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/19373007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">19373007</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/H49.88" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H49.88</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/378.55" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">378.55</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0162292&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0162292</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000544" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000544</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000544" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000544</a>]</span><br /> -
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Supranuclear ophthalmoplegia <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1408507&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1408507</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000623" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000623</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000623" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000623</a>]</span><br /> -
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Diplopia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/24982008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">24982008</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/H53.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H53.2</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/368.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">368.2</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0012569&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0012569</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000651" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000651</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000651" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000651</a>]</span><br /> -
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Dysmetric saccades <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1836392&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1836392</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000641" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000641</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000641" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000641</a>]</span><br /> -
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|
Impaired horizontal smooth pursuit <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1866753&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1866753</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001151" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001151</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001151" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001151</a>]</span><br /> -
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Blepharoptosis <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/11934000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">11934000</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/H02.409" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H02.409</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/H02.40" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H02.40</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/H02.4" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H02.4</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/374.3" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">374.3</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/374.30" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">374.30</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0005745&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0005745</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000508" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000508</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000508" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000508</a>]</span> <a href="https://elementsofmorphology.nih.gov/index.cgi?tid=76abf29563d4adc64d21da86221224b1" target="_blank" class="small mim-tip-eom" title="<img src="https://elementsofmorphology.nih.gov/images/terms/Ptosis-small.jpg"> <br/>Further Information: <a href="https://elementsofmorphology.nih.gov/index.cgi?tid=76abf29563d4adc64d21da86221224b1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'EOM\', \'domain\': \'elementsofmorphology.nih.gov\'})">Elements of Morphology</a>"><span class="glyphicon glyphicon-user" aria-hidden="true"></span></a><br /> -
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Bulging eyes <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/18265008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">18265008</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/H05.20" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H05.20</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/376.30" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">376.30</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0015300&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0015300</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000520" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000520</a>]</span><br /> -
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Abnormal electrooculogram (EOG) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862369&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862369</a>]</span> <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/442770004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">442770004</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R94.110" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R94.110</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/794.12" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">794.12</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0030454" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0030454</a>]</span><br />
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</span>
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</div>
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</div>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<strong> ABDOMEN </strong>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<div>
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<div>
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<span class="h5 mim-font">
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<em> Gastrointestinal </em>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<span class="mim-font">
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- Dysphagia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/288939007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">288939007</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/40739000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">40739000</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R13.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R13.1</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/R13.10" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R13.10</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/787.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">787.2</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/787.20" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">787.20</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0011168&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0011168</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002015" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002015</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002015" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002015</a>]</span><br />
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</span>
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</div>
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</div>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<strong> GENITOURINARY </strong>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<div>
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<div>
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<span class="h5 mim-font">
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<em> Bladder </em>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<span class="mim-font">
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- Sphincter disturbances <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1843663&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1843663</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002839" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002839</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002839" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002839</a>]</span><br />
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</span>
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</div>
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</div>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<strong> MUSCLE, SOFT TISSUES </strong>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<div>
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<span class="mim-font">
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- Muscle cramps <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/45352006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">45352006</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/55300003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">55300003</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/M62.83" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">M62.83</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/728.85" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">728.85</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0037763&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0037763</a>, <a href="https://bioportal.bioontology.org/search?q=C0026821&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0026821</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003394" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003394</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003394" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003394</a>]</span><br /> -
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|
Fasciculations <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/82470000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">82470000</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R25.3" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R25.3</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0015644&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0015644</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002380" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002380</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002380" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002380</a>]</span><br />
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</span>
|
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</div>
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</div>
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</div>
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<div>
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<div>
|
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<span class="h5 mim-font">
|
|
<strong> NEUROLOGIC </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
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<div>
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<div>
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<span class="h5 mim-font">
|
|
<em> Central Nervous System </em>
|
|
</span>
|
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</div>
|
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<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Cerebellar ataxia, progressive <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/230233000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">230233000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0393525&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0393525</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002073" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002073</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002073" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002073</a>]</span><br /> -
|
|
Limb ataxia <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0750937&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0750937</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002070" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002070</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002070" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002070</a>]</span><br /> -
|
|
Truncal ataxia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/250067008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">250067008</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0427190&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0427190</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002078" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002078</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002078" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002078</a>]</span><br /> -
|
|
Spasticity <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/221360009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">221360009</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/397790002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">397790002</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0026838&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0026838</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001257" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001257</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001257" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001257</a>]</span><br /> -
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|
Pyramidal signs <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/14648003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">14648003</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0234132&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0234132</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0007256" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0007256</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0007256" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0007256</a>]</span><br /> -
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Extrapyramidal signs <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/43378000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">43378000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0234133&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0234133</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002071" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002071</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002071" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002071</a>]</span><br /> -
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|
Facial-lingual fasciculations <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862359&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862359</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0007089" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0007089</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0007089" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0007089</a>]</span><br /> -
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Parkinsonism <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/32798002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">32798002</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/G20.C" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">G20.C</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0242422&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0242422</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001300" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001300</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001300" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001300</a>]</span><br /> -
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Bradykinesia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/399317006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">399317006</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0233565&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0233565</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002067" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002067</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002067" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002067</a>]</span><br /> -
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Postural instability <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1843921&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1843921</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002172" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002172</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002172" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002172</a>]</span><br /> -
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Extensor plantar responses <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/246586009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">246586009</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/366575004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">366575004</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0034935&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0034935</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003487" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003487</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003487" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003487</a>]</span><br /> -
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Dysarthria <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/8011004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">8011004</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/438.13" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">438.13</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/784.51" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">784.51</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0013362&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0013362</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001260" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001260</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001260" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001260</a>]</span><br /> -
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Rigidity <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/16046003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">16046003</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0700109&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0700109</a>, <a href="https://bioportal.bioontology.org/search?q=C0026837&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0026837</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002063" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002063</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002063" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002063</a>]</span><br /> -
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Dementia (<20%) <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/52448006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">52448006</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/12348006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">12348006</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/F03.90" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F03.90</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/F03" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F03</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/290.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">290.1</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/294.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">294.2</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/290" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">290</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0011265&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0011265</a>, <a href="https://bioportal.bioontology.org/search?q=C0497327&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0497327</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000726" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000726</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000726" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000726</a>]</span><br /> -
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Dystonia (<20%) <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/15802004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">15802004</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/G24.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">G24.9</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/G24" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">G24</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0013421&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0013421</a>, <a href="https://bioportal.bioontology.org/search?q=C0393593&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0393593</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001332" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001332</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001332" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001332</a>]</span><br /> -
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Chronic pain <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/82423001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">82423001</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/338.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">338.2</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0150055&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0150055</a>, <a href="https://bioportal.bioontology.org/search?q=C5700083&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5700083</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0012532" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0012532</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0012532" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0012532</a>]</span><br /> -
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Fasciculation-like movements <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1866748&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1866748</a>]</span><br /> -
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Autonomic dysfunction may occur <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862362&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862362</a>]</span> <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/15241006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">15241006</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/G90.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">G90.9</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/G90" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">G90</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/337" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">337</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/337.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">337.9</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0012332" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0012332</a>]</span><br /> -
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Loss of neurons and gliosis in basal ganglia, cranial nerve nuclei, and spinal cord <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862363&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862363</a>]</span><br /> -
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Cerebellar atrophy, mild <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862364&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862364</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001272" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001272</a>]</span><br /> -
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Enlarged fourth ventricle, mild <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862365&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862365</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002198" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002198</a>]</span><br /> -
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Mild loss of neurons in the cerebellum <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862366&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862366</a>]</span><br /> -
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Sparing of the inferior olives <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862367&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862367</a>]</span><br /> -
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Spinocerebellar tract degeneration <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1866751&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1866751</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002503" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002503</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002503" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002503</a>]</span><br />
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</span>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<em> Peripheral Nervous System </em>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<span class="mim-font">
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- Peripheral neuropathy <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/42658009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">42658009</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/302226006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">302226006</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/G64" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">G64</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/350-359.99" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">350-359.99</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4721453&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4721453</a>, <a href="https://bioportal.bioontology.org/search?q=C0031117&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0031117</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0009830" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0009830</a>, <a href="https://hpo.jax.org/app/browse/term/HP:0000759" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000759</a>, <a href="https://hpo.jax.org/app/browse/term/HP:0001271" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001271</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0009830" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0009830</a>]</span><br /> -
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Decreased vibration sense <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/130980003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">130980003</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1295585&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1295585</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002495" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002495</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002495" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002495</a>]</span><br /> -
|
|
Impaired thermal sense <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1862368&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1862368</a>]</span><br /> -
|
|
Decreased or absent ankle reflexes <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1850816&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1850816</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0200101" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0200101</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0200101" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0200101</a>]</span><br /> -
|
|
Distal muscular atrophy <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1848736&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1848736</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003693" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003693</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003693" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003693</a>]</span><br />
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|
|
</span>
|
|
</div>
|
|
</div>
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</div>
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</div>
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<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<strong> MISCELLANEOUS </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
|
|
<div>
|
|
<span class="mim-font">
|
|
|
|
- Onset in third to fourth decade<br /> -
|
|
Wide clinical variability<br /> -
|
|
Progressive disorder <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1864985&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1864985</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003676" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003676</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003676" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003676</a>]</span><br /> -
|
|
Normal alleles contain up to 44 repeats<br /> -
|
|
Pathogenic alleles contain 52 to 86 repeats<br /> -
|
|
Incomplete penetrance with 45 to 51 repeats<br /> -
|
|
Genetic anticipation <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0600498&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0600498</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003743" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003743</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003743" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003743</a>]</span><br />
|
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|
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</span>
|
|
</div>
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|
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</div>
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|
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</div>
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<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<strong> MOLECULAR BASIS </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
|
|
<div>
|
|
<span class="mim-font">
|
|
|
|
- Caused by trinucleotide repeat expansion (CAG)n in the ataxin-3 gene (MJD, <a href="/entry/607047#0001">607047.0001</a>)<br />
|
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|
|
</span>
|
|
</div>
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|
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</div>
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|
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</div>
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|
|
<div class="text-right">
|
|
<a href="#mimClinicalSynopsisFold" data-toggle="collapse">▲ Close</a>
|
|
</div>
|
|
</div>
|
|
</div>
|
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|
|
<div id="mimPhenotypicSeriesFold" class="well well-sm collapse mimSingletonToggleFold">
|
|
<div class="small">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
<div class="row">
|
|
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
|
|
<h5>
|
|
Spinocerebellar ataxia
|
|
- <a href="/phenotypicSeries/PS164400">PS164400</a>
|
|
- 49 Entries
|
|
</h5>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="row" style="margin-left: 0.125em; margin-right: 0.125em;">
|
|
<table class="table table-bordered table-condensed table-hover mim-table-padding">
|
|
<thead>
|
|
<tr>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Location</strong>
|
|
</th>
|
|
<th class="col-lg-5 col-md-5 col-sm-5 col-xs-6 text-nowrap">
|
|
<strong>Phenotype</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Inheritance</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Phenotype<br />mapping key</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Phenotype<br />MIM number</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Gene/Locus</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Gene/Locus<br />MIM number</strong>
|
|
</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/49?start=-3&limit=10&highlight=49"> 1p36.33 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607454"> Spinocerebellar ataxia 21 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607454"> 607454 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616101"> TMEM240 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616101"> 616101 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/378?start=-3&limit=10&highlight=378"> 1p35.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617931"> Spinocerebellar ataxia 47 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617931"> 617931 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607204"> PUM1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607204"> 607204 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/653?start=-3&limit=10&highlight=653"> 1p32.2-p32.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/615945"> Spinocerebellar ataxia 37 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/615945"> 615945 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/603448"> DAB1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/603448"> 603448 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/919?start=-3&limit=10&highlight=919"> 1p13.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607346"> Spinocerebellar ataxia 19 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607346"> 607346 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/605411"> KCND3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/605411"> 605411 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/2/269?start=-3&limit=10&highlight=269"> 2p16.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608703"> Spinocerebellar ataxia 25 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608703"> 608703 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610316"> PNPT1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610316"> 610316 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/3/17?start=-3&limit=10&highlight=17"> 3p26.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/606658"> Spinocerebellar ataxia 15 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/606658"> 606658 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/147265"> ITPR1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/147265"> 147265 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/3/17?start=-3&limit=10&highlight=17"> 3p26.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/117360"> Spinocerebellar ataxia 29, congenital nonprogressive </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/117360"> 117360 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/147265"> ITPR1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/147265"> 147265 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/3/436?start=-3&limit=10&highlight=436"> 3p14.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/164500"> Spinocerebellar ataxia 7 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/164500"> 164500 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607640"> ATXN7 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607640"> 607640 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/3/798?start=-3&limit=10&highlight=798"> 3q25.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617018"> ?Spinocerebellar ataxia 43 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617018"> 617018 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/120520"> MME </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/120520"> 120520 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/4/531?start=-3&limit=10&highlight=531"> 4q27 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616410"> ?Spinocerebellar ataxia 41 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616410"> 616410 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/602345"> TRPC3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/602345"> 602345 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/4/691?start=-3&limit=10&highlight=691"> 4q34.3-q35.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613371"> ?Spinocerebellar ataxia 30 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613371"> 613371 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613371"> SCA30 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613371"> 613371 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/5/633?start=-3&limit=10&highlight=633"> 5q32 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604326"> Spinocerebellar ataxia 12 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604326"> 604326 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604325"> PPP2R2B </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604325"> 604325 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/5/687?start=-3&limit=10&highlight=687"> 5q33.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617769"> Spinocerebellar ataxia 45 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617769"> 617769 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604269"> FAT2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604269"> 604269 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/6/90?start=-3&limit=10&highlight=90"> 6p22.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/164400"> Spinocerebellar ataxia 1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/164400"> 164400 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601556"> ATXN1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601556"> 601556 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/6/600?start=-3&limit=10&highlight=600"> 6p12.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/615957"> Spinocerebellar ataxia 38 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/615957"> 615957 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611805"> ELOVL5 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611805"> 611805 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/6/667?start=-3&limit=10&highlight=667"> 6q14.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/133190"> Spinocerebellar ataxia 34 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/133190"> 133190 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/605512"> ELOVL4 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/605512"> 605512 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/6/928?start=-3&limit=10&highlight=928"> 6q24.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617691"> Spinocerebellar ataxia 44 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617691"> 617691 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604473"> GRM1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604473"> 604473 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/6/1041?start=-3&limit=10&highlight=1041"> 6q27 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607136"> Spinocerebellar ataxia 17 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607136"> 607136 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600075"> TBP </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600075"> 600075 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/7/414?start=-3&limit=10&highlight=414"> 7q21.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/619806"> ?Spinocerebellar ataxia 49 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/619806"> 619806 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611170"> SAMD9L </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611170"> 611170 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/7/454?start=-3&limit=10&highlight=454"> 7q22-q32 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607458"> Spinocerebellar ataxia 18 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607458"> 607458 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607458"> SCA18 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607458"> 607458 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/7/642?start=-3&limit=10&highlight=642"> 7q32-q33 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613909"> Spinocerebellar ataxia 32 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613909"> 613909 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613909"> SCA32 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613909"> 613909 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/11/380?start=-3&limit=10&highlight=380"> 11q12 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608687"> Spinocerebellar ataxia 20 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="4 - A contiguous gene duplication or deletion syndrome in which multiple genes are involved"> 4 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608687"> 608687 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608687"> SCA20 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608687"> 608687 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/11/646?start=-3&limit=10&highlight=646"> 11q13.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600224"> Spinocerebellar ataxia 5 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600224"> 600224 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604985"> SPTBN2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604985"> 604985 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/12/813?start=-3&limit=10&highlight=813"> 12q24.12 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/183090"> Spinocerebellar ataxia 2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/183090"> 183090 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601517"> ATXN2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601517"> 601517 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/12/813?start=-3&limit=10&highlight=813"> 12q24.12 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/183090"> {Amyotrophic lateral sclerosis, susceptibility to, 13} </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/183090"> 183090 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601517"> ATXN2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601517"> 601517 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/13/204?start=-3&limit=10&highlight=204"> 13q21 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608768"> Spinocerebellar ataxia 8 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608768"> 608768 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613289"> ATXN8 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613289"> 613289 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/13/213?start=-3&limit=10&highlight=213"> 13q21.33 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608768"> Spinocerebellar ataxia 8 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608768"> 608768 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/603680"> ATXN8OS </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/603680"> 603680 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/13/293?start=-3&limit=10&highlight=293"> 13q33.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/193003"> Spinocerebellar ataxia 27A </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/193003"> 193003 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601515"> FGF14 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601515"> 601515 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/13/293?start=-3&limit=10&highlight=293"> 13q33.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620174"> Spinocerebellar ataxia 27B, late-onset </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620174"> 620174 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601515"> FGF14 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601515"> 601515 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/14/460?start=-3&limit=10&highlight=460"> 14q32.11-q32.12 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616053"> ?Spinocerebellar ataxia 40 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616053"> 616053 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611204"> CCDC88C </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611204"> 611204 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/14/466?start=-3&limit=10&highlight=466"> 14q32.12 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/109150"> Machado-Joseph disease </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/109150"> 109150 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607047"> ATXN3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607047"> 607047 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/15/139?start=-3&limit=10&highlight=139"> 15q15.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604432"> Spinocerebellar ataxia 11 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604432"> 604432 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611695"> TTBK2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611695"> 611695 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/16/37?start=-3&limit=10&highlight=37"> 16p13.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618093"> Spinocerebellar ataxia 48 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618093"> 618093 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607207"> STUB1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607207"> 607207 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/16/510?start=-3&limit=10&highlight=510"> 16q21 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/117210"> Spinocerebellar ataxia 31 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/117210"> 117210 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/612051"> BEAN1 </a>
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|
</span>
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</td>
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<td>
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|
<span class="mim-font">
|
|
<a href="/entry/612051"> 612051 </a>
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</span>
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</td>
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</tr>
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|
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<tr>
|
|
<td>
|
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<span class="mim-font">
|
|
|
|
<a href="/geneMap/16/561?start=-3&limit=10&highlight=561"> 16q22.1 </a>
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|
|
|
</span>
|
|
</td>
|
|
<td>
|
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<span class="mim-font">
|
|
<a href="/entry/620947"> Spinocerebellar ataxia 51 </a>
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</span>
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</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620947"> 620947 </a>
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</span>
|
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</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/609119"> THAP11 </a>
|
|
</span>
|
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</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/609119"> 609119 </a>
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</span>
|
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</td>
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</tr>
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<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/16/630?start=-3&limit=10&highlight=630"> 16q22.2-q22.3 </a>
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|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600223"> Spinocerebellar ataxia 4 </a>
|
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</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600223"> 600223 </a>
|
|
</span>
|
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</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/104155"> ZFHX3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/104155"> 104155 </a>
|
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</span>
|
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</td>
|
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</tr>
|
|
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|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/17/747?start=-3&limit=10&highlight=747"> 17q21.33 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616795"> Spinocerebellar ataxia 42 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616795"> 616795 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604065"> CACNA1G </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604065"> 604065 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/17/1021?start=-3&limit=10&highlight=1021"> 17q25.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620158"> Spinocerebellar ataxia 50 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620158"> 620158 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/602367"> NPTX1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/602367"> 602367 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/18/63?start=-3&limit=10&highlight=63"> 18p11.21 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610246"> Spinocerebellar ataxia 28 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610246"> 610246 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604581"> AFG3L2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/604581"> 604581 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/19/123?start=-3&limit=10&highlight=123"> 19p13.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/609306"> ?Spinocerebellar ataxia 26 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/609306"> 609306 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/130610"> EEF2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/130610"> 130610 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/19/355?start=-3&limit=10&highlight=355"> 19p13.13 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/183086"> Spinocerebellar ataxia 6 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/183086"> 183086 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601011"> CACNA1A </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601011"> 601011 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/19/700?start=-3&limit=10&highlight=700"> 19q13.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617770"> ?Spinocerebellar ataxia 46 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617770"> 617770 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/615698"> PLD3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/615698"> 615698 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/19/978?start=-3&limit=10&highlight=978"> 19q13.33 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/605259"> Spinocerebellar ataxia 13 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/605259"> 605259 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/176264"> KCNC3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/176264"> 176264 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/19/1111?start=-3&limit=10&highlight=1111"> 19q13.42 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/605361"> Spinocerebellar ataxia 14 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/605361"> 605361 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/176980"> PRKCG </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/176980"> 176980 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/20/29?start=-3&limit=10&highlight=29"> 20p13 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610245"> Spinocerebellar ataxia 23 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610245"> 610245 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/131340"> PDYN </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/131340"> 131340 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/20/32?start=-3&limit=10&highlight=32"> 20p13 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613908"> Spinocerebellar ataxia 35 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613908"> 613908 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613900"> TGM6 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613900"> 613900 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/20/35?start=-3&limit=10&highlight=35"> 20p13 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614153"> Spinocerebellar ataxia 36 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614153"> 614153 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614154"> NOP56 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614154"> 614154 </a>
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<p>A number sign (#) is used with this entry because Machado-Joseph disease (MJD), also known as spinocerebellar ataxia-3 (SCA3), is caused by a heterozygous (CAG)n trinucleotide repeat expansion encoding glutamine repeats in the ataxin-3 gene (ATXN3; <a href="/entry/607047">607047</a>) on chromosome 14q32.</p><p>Normal individuals have up to 44 glutamine repeats, and MJD patients have between 52 and 86 glutamine repeats. Incomplete penetrance is associated with 45 to 51 repeats (<a href="#112" class="mim-tip-reference" title="Todd, P. K., Paulson, H. L. <strong>RNA-mediated neurodegeneration in repeat expansion disorders.</strong> Ann. Neurol. 67: 291-300, 2010.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/20373340/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">20373340</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=20373340[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1002/ana.21948" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="20373340">Todd and Paulson, 2010</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20373340" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>For a general discussion of autosomal dominant spinocerebellar ataxia, see SCA1 (<a href="/entry/164400">164400</a>).</p>
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<p>Machado-Joseph disease (MJD), named for affected families of Azorean extraction, is an autosomal dominant progressive neurologic disorder characterized principally by ataxia, spasticity, and ocular movement abnormalities. Although independently described as a seemingly separate disorder, spinocerebellar ataxia-3 (SCA3) is now known to be the same as Machado-Joseph disease.</p><p>Three classic clinical subtypes of MJD are recognized: type 1 with early onset and marked pyramidal and dystonic signs; type 2, or pure, with predominant cerebellar ataxia; and type 3 with later-onset and peripheral neuropathy (<a href="#27" class="mim-tip-reference" title="Franca, M. C., Jr., D'Abreu, A., Nucci, A., Lopes-Cendes, I. <strong>Muscle excitability abnormalities in Machado-Joseph disease.</strong> Arch. Neurol. 65: 525-529, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18413477/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18413477</a>] [<a href="https://doi.org/10.1001/archneur.65.4.525" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18413477">Franca et al., 2008</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=18413477" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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Among Portuguese immigrants living in New England, <a href="#67" class="mim-tip-reference" title="Nakano, K. K., Dawson, D. M., Spence, A. <strong>Machado disease: a hereditary ataxia in Portuguese emigrants to Massachusetts.</strong> Neurology 22: 49-55, 1972.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5061839/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5061839</a>] [<a href="https://doi.org/10.1212/wnl.22.1.49" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5061839">Nakano et al. (1972)</a> described a form of dominantly inherited ataxia occurring in descendants of William Machado, a native of an island in the Portuguese Azores. The disorder began as ataxic gait after age 40. Six patients studied in detail showed abnormally large amounts of air in the posterior fossa on pneumoencephalogram, denervation atrophy of muscle, and diabetes mellitus. Other families of Azorean origin living in Massachusetts (<a href="#77" class="mim-tip-reference" title="Romanul, F. C. A., Fowler, H. L., Radvany, J., Feldman, R. G., Feingold, M. <strong>Azorean disease of the nervous system.</strong> New Eng. J. Med. 296: 1505-1508, 1977.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/865531/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">865531</a>] [<a href="https://doi.org/10.1056/NEJM197706302962606" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="865531">Romanul et al., 1977</a>; <a href="#125" class="mim-tip-reference" title="Woods, B. T., Schaumburg, H. H. <strong>Nigro-spino-dentatal degeneration with nuclear ophthalmoplegia: a unique and partially treatable clinico-pathological entity.</strong> J. Neurol. Sci. 17: 149-166, 1972.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5053922/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5053922</a>] [<a href="https://doi.org/10.1016/0022-510x(72)90137-2" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5053922">Woods and Schaumburg, 1972</a>) and in California (<a href="#79" class="mim-tip-reference" title="Rosenberg, R. N., Nyhan, W. L., Bay, C., Shore, P. <strong>Autosomal dominant striato-nigral degeneration: a clinical, pathologic and biochemical study of a new genetic disorder.</strong> Neurology 26: 703-714, 1976.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/945867/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">945867</a>] [<a href="https://doi.org/10.1212/wnl.26.8.703" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="945867">Rosenberg et al., 1976</a>) were reported. <a href="#77" class="mim-tip-reference" title="Romanul, F. C. A., Fowler, H. L., Radvany, J., Feldman, R. G., Feingold, M. <strong>Azorean disease of the nervous system.</strong> New Eng. J. Med. 296: 1505-1508, 1977.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/865531/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">865531</a>] [<a href="https://doi.org/10.1056/NEJM197706302962606" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="865531">Romanul et al. (1977)</a> suggested that all 4 reported kindreds had the same mutant gene despite differences in expression. The progressive neurologic disorder was characterized by gait ataxia, features similar to those in Parkinson disease (PD; <a href="/entry/168600">168600</a>) in some patients, limitation of eye movements, widespread fasciculations of muscles, loss of reflexes in the lower limbs, followed by nystagmus, mild cerebellar tremors, and extensor plantar responses. Postmortem examinations showed loss of neurons and gliosis in the substantia nigra, nuclei pontis (and in the putamen in one case) as well as the nuclei of the vestibular and cranial nerves, columns of Clarke and anterior horns. <a href="#80" class="mim-tip-reference" title="Rosenberg, R. N. <strong>Azorean disease of the nervous system. (Letter)</strong> New Eng. J. Med. 297: 729, 1977.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/895799/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">895799</a>] [<a href="https://doi.org/10.1056/NEJM197709292971318" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="895799">Rosenberg (1977)</a> referred to the disorder he and his colleagues described as Joseph disease (<a href="#79" class="mim-tip-reference" title="Rosenberg, R. N., Nyhan, W. L., Bay, C., Shore, P. <strong>Autosomal dominant striato-nigral degeneration: a clinical, pathologic and biochemical study of a new genetic disorder.</strong> Neurology 26: 703-714, 1976.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/945867/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">945867</a>] [<a href="https://doi.org/10.1212/wnl.26.8.703" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="945867">Rosenberg et al., 1976</a>) and questioned that one can be certain of its identity to the disorder in other families of Azorean origin. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=945867+895799+5061839+865531+5053922" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In January 1976, Corino Andrade (<a href="#19" class="mim-tip-reference" title="Coutinho, P., Calheiros, J. M., Andrade, C. <strong>(On a new degenerative disorder of the central nervous system, inherited in an autosomal dominant mode and affecting people of Azorean extraction.).</strong> O Medico 82: 446-448, 1977."None>Coutinho et al., 1977</a>) 'went to the Azores...to investigate a degenerative disease of the central nervous system known to exist there. We saw 40 patients belonging to 15 families (in the islands of Flores and St. Michael)...It is our opinion that different families just mentioned, which have been taken as separate diseases, are only clinically diverse forms of the same disorder, of which symptomatic pleomorphism is a conspicuous feature.' In the same year, <a href="#77" class="mim-tip-reference" title="Romanul, F. C. A., Fowler, H. L., Radvany, J., Feldman, R. G., Feingold, M. <strong>Azorean disease of the nervous system.</strong> New Eng. J. Med. 296: 1505-1508, 1977.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/865531/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">865531</a>] [<a href="https://doi.org/10.1056/NEJM197706302962606" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="865531">Romanul et al. (1977)</a> arrived at the same conclusion. The full paper by <a href="#18" class="mim-tip-reference" title="Coutinho, P., Andrade, C. <strong>Autosomal dominant system degeneration in Portuguese families of the Azores Islands: a new genetic disorder involving cerebellar, pyramidal, extrapyramidal and spinal cord motor functions.</strong> Neurology 28: 703-709, 1978.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/566869/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">566869</a>] [<a href="https://doi.org/10.1212/wnl.28.7.703" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="566869">Coutinho and Andrade (1978)</a> appeared the next year. <a href="#57" class="mim-tip-reference" title="Lima, L., Coutinho, P. <strong>Clinical criteria for diagnosis of Machado-Joseph disease: report of a non-Azorean Portuguese family.</strong> Neurology 30: 319-322, 1980.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7189034/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7189034</a>] [<a href="https://doi.org/10.1212/wnl.30.3.319" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7189034">Lima and Coutinho (1980)</a> described a mainland Portuguese family. The possibility that the Joseph family was originally Sephardic Jewish was raised by <a href="#89" class="mim-tip-reference" title="Sequeiros, J., Coutinho, P. <strong>Genetic aspects of Machado-Joseph disease.</strong> Broteria-Genetica (Lisbon) 77: 137-147, 1981."None>Sequeiros and Coutinho (1981)</a>. Mainland families originated in a mountainous and relatively inaccessible region of northeastern Portugal where large communities of Sephardic Jews settled at one time. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=865531+566869+7189034" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Under the designation 'spinopontine degeneration,' <a href="#7" class="mim-tip-reference" title="Boller, F., Segarra, J. M. <strong>Spino-pontine degeneration.</strong> Europ. Neurol. 2: 356-373, 1969.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5808476/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5808476</a>] [<a href="https://doi.org/10.1159/000113812" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5808476">Boller and Segarra (1969)</a> reported 24 persons with late-onset ataxia in 4 generations of an Anglo-Saxon family. <a href="#110" class="mim-tip-reference" title="Taniguchi, R., Konigsmark, B. W. <strong>Dominant spino-pontine atrophy: report of a family through three generations.</strong> Brain 94: 349-358, 1971.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5571046/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5571046</a>] [<a href="https://doi.org/10.1093/brain/94.2.349" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5571046">Taniguchi and Konigsmark (1971)</a> described 16 affected persons in 3 generations of a black family. The pathologic findings were similar in the 2 families. The cerebellum was relatively spared and the inferior olives were normal. The spinal cord showed loss of myelinated fibers in the spinocerebellar tracts and posterior funiculi. There was also marked loss of nuclei basis ponti. <a href="#70" class="mim-tip-reference" title="Pogacar, S., Ambler, M., Conklin, W. J., O'Neil, W. A., Lee, H. Y. <strong>Dominant spinopontine atrophy: report of two additional members of family W.</strong> Arch. Neurol. 35: 156-162, 1978.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/629660/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">629660</a>] [<a href="https://doi.org/10.1001/archneur.1978.00500270038008" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="629660">Pogacar et al. (1978)</a> followed up on the Boller-Segarra family (members of which had lived in northern Rhode Island for over 300 years). In 2 clinical cases and 1 autopsy, they questioned the separation from olivopontocerebellar ataxia (SCA1; <a href="/entry/164400">164400</a>), because they found abolished tendon reflexes and flexion contractures of the legs in 1 patient, and onset at 18 years of age, palatal myoclonus and optic atrophy in the second. Dementia developed in both. Pathologic findings, in contrast to earlier reports, showed involvement of the cerebellum and inferior olivary nuclei. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=5808476+5571046+629660" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#18" class="mim-tip-reference" title="Coutinho, P., Andrade, C. <strong>Autosomal dominant system degeneration in Portuguese families of the Azores Islands: a new genetic disorder involving cerebellar, pyramidal, extrapyramidal and spinal cord motor functions.</strong> Neurology 28: 703-709, 1978.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/566869/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">566869</a>] [<a href="https://doi.org/10.1212/wnl.28.7.703" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="566869">Coutinho and Andrade (1978)</a> proposed a 3-way phenotypic classification for MJD: cerebellar ataxia, external ophthalmoplegia and pyramidal signs (type 2), additional predominant extrapyramidal signs (type 1), and additional distal muscular atrophy (type 3). Although not completely specific to MJD, dystonia, facial and lingual fasciculations, and peculiar, bulging eyes represent a constellation strongly suggestive of this disease. <a href="#81" class="mim-tip-reference" title="Rosenberg, R. N. <strong>Dominant ataxias. In: Kety, S. S.; Rowland, L. P.; Sidman, R. L.; Matthysse, S. W. (eds.): Genetics of Neurological and Psychiatric Disorders.</strong> New York: Raven Press (pub.) 1983."None>Rosenberg (1983)</a> added a fourth phenotype: neuropathy and parkinsonism. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=566869" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#20" class="mim-tip-reference" title="Coutinho, P., Guimaraes, A., Scaravilli, F. <strong>The pathology of Machado-Joseph disease: report of a possible homozygous case.</strong> Acta Neuropath. 58: 48-54, 1982.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7136516/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7136516</a>] [<a href="https://doi.org/10.1007/BF00692697" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7136516">Coutinho et al. (1982)</a> described the presumedly homozygotic son of 2 affected parents; the son had onset at age 8 and died of the disease at age 15. Another son of these parents had onset at age 7. As with other late-onset dominant spinocerebellar degenerations (notably the olivopontocerebellar degenerations), there is considerable phenotypic variation even within the same family. <a href="#4" class="mim-tip-reference" title="Barbeau, A., Roy, M., Cunha, L., de Vincente, A. N., Rosenberg, R. N., Nyhan, W. L., MacLeod, P. L., Chazot, G., Langston, L. B., Dawson, D. M., Coutinho, P. <strong>The natural history of Machado-Joseph disease: an analysis of 138 personally examined cases.</strong> Canad. J. Neurol. Sci. 11: 510-525, 1984.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6509398/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6509398</a>] [<a href="https://doi.org/10.1017/s0317167100034983" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="6509398">Barbeau et al. (1984)</a> gave an extensive review. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7136516+6509398" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#93" class="mim-tip-reference" title="Sequeiros, J. <strong>Personal Communication.</strong> Baltimore, Md. and Oporto, Portugal 3/4/1985."None>Sequeiros (1985)</a> pointed out that the diagnosis of Machado-Joseph disease had been made (<a href="#39" class="mim-tip-reference" title="Healton, E. B., Brust, J. C. M., Kerr, D. L., Resor, S., Penn, A. <strong>Presumably Azorean disease in a presumably non-Portuguese family.</strong> Neurology 30: 1084-1089, 1980.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7191499/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7191499</a>] [<a href="https://doi.org/10.1212/wnl.30.10.1084" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7191499">Healton et al., 1980</a>) in an American black family originating from North Carolina; that on further check this proved to be the family reported by <a href="#110" class="mim-tip-reference" title="Taniguchi, R., Konigsmark, B. W. <strong>Dominant spino-pontine atrophy: report of a family through three generations.</strong> Brain 94: 349-358, 1971.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5571046/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5571046</a>] [<a href="https://doi.org/10.1093/brain/94.2.349" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5571046">Taniguchi and Konigsmark (1971)</a>; that <a href="#20" class="mim-tip-reference" title="Coutinho, P., Guimaraes, A., Scaravilli, F. <strong>The pathology of Machado-Joseph disease: report of a possible homozygous case.</strong> Acta Neuropath. 58: 48-54, 1982.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7136516/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7136516</a>] [<a href="https://doi.org/10.1007/BF00692697" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7136516">Coutinho et al. (1982)</a>, in commenting on the neuropathology of Machado-Joseph disease, noted the similarity to the spinopontine atrophy reported by <a href="#7" class="mim-tip-reference" title="Boller, F., Segarra, J. M. <strong>Spino-pontine degeneration.</strong> Europ. Neurol. 2: 356-373, 1969.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5808476/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5808476</a>] [<a href="https://doi.org/10.1159/000113812" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5808476">Boller and Segarra (1969)</a>, <a href="#110" class="mim-tip-reference" title="Taniguchi, R., Konigsmark, B. W. <strong>Dominant spino-pontine atrophy: report of a family through three generations.</strong> Brain 94: 349-358, 1971.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5571046/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5571046</a>] [<a href="https://doi.org/10.1093/brain/94.2.349" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5571046">Taniguchi and Konigsmark (1971)</a>, and <a href="#45" class="mim-tip-reference" title="Ishino, H., Sata, M., Mii, T., Terao, A., Hayahara, T., Otsuki, S., Hoaki, T. <strong>An autopsy case of Marie's hereditary ataxia.</strong> Psychiat. Neurol. Jpn. 73: 747-757, 1971.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5168989/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5168989</a>]" pmid="5168989">Ishino et al. (1971)</a>; and, finally, that the disorder reported in the last family, Japanese, had been proved to be Machado-Joseph disease. See <a href="#92" class="mim-tip-reference" title="Sequeiros, J., Suite, N. D. A. <strong>Spinopontine atrophy disputed as a separate entity: the first description of Machado-Joseph disease. (Letter)</strong> Neurology 36: 1408, 1986.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/3463884/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">3463884</a>]" pmid="3463884">Sequeiros and Suite (1986)</a>. <a href="#54" class="mim-tip-reference" title="Lazzarini, A., Zimmerman, T. R., Jr., Johnson, W. G., Duvoism, R. C. <strong>A 17th-century founder gives rise to a large North American pedigree of autosomal dominant spinocerebellar ataxia not linked to the SCA1 locus on chromosome 6.</strong> Neurology 42: 2118-2124, 1992.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/1436521/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">1436521</a>] [<a href="https://doi.org/10.1212/wnl.42.11.2118" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="1436521">Lazzarini et al. (1992)</a> expanded on the pedigree of the family first reported by <a href="#7" class="mim-tip-reference" title="Boller, F., Segarra, J. M. <strong>Spino-pontine degeneration.</strong> Europ. Neurol. 2: 356-373, 1969.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5808476/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5808476</a>] [<a href="https://doi.org/10.1159/000113812" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5808476">Boller and Segarra (1969)</a> and concluded that the disorder represented a spinocerebellar ataxia phenotypically similar to that of spinocerebellar ataxia type 1, which shows linkage to HLA. However, linkage to HLA was excluded in this kindred, leading to the designation SCA2 (<a href="/entry/183090">183090</a>) for this and other HLA-unlinked SCA kindreds. <a href="#96" class="mim-tip-reference" title="Silveira, I., Manaia, A., Melki, J., Magarino, C., Lunkes, A., Hernandez, A., Gispert, S., Burlet, P., Rozet, J.-M., Coutinho, P., Loureiro, J. E. L., Guimaraes, J., Auburger, G., Munnich, A., Sequeiros, J. <strong>Machado-Joseph disease is genetically different from Holguin dominant ataxia (SCA2).</strong> Genomics 17: 556-559, 1993.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7902323/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7902323</a>] [<a href="https://doi.org/10.1006/geno.1993.1371" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7902323">Silveira et al. (1993)</a> demonstrated that the disorder designated Holguin ataxia, or SCA2, that is frequent in Cubans, is genetically distinct from MJD; MJD was excluded from a location on 12q where linkage studies showed the SCA2 locus to be situated. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7191499+3463884+7136516+5168989+7902323+5808476+5571046+1436521" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#24" class="mim-tip-reference" title="Eto, K., Sumi, S. M., Bird, T. D., McEvoy-Bush, T., Boehnke, M., Schellenberg, G. <strong>Family with dominantly inherited ataxia, amyotrophy, and peripheral sensory loss: spinopontine atrophy or Machado-Joseph Azorean disease in another non-Portuguese family?</strong> Arch. Neurol. 47: 968-974, 1990.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/2396938/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">2396938</a>] [<a href="https://doi.org/10.1001/archneur.1990.00530090038011" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="2396938">Eto et al. (1990)</a> described a family of German extraction with progressive ataxia, eye movement abnormalities, peripheral sensory loss, and spinal muscular atrophy of adult onset. The pedigree pattern in 4 generations was consistent with autosomal dominant inheritance. <a href="#24" class="mim-tip-reference" title="Eto, K., Sumi, S. M., Bird, T. D., McEvoy-Bush, T., Boehnke, M., Schellenberg, G. <strong>Family with dominantly inherited ataxia, amyotrophy, and peripheral sensory loss: spinopontine atrophy or Machado-Joseph Azorean disease in another non-Portuguese family?</strong> Arch. Neurol. 47: 968-974, 1990.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/2396938/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">2396938</a>] [<a href="https://doi.org/10.1001/archneur.1990.00530090038011" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="2396938">Eto et al. (1990)</a> suggested that the form of spinopontine atrophy might be different from Machado-Joseph disease: the eyes were not protuberant, extraocular movements were abnormal to a minor degree, and neuropathologically the substantia nigra and dentate nucleus were spared. <a href="#24" class="mim-tip-reference" title="Eto, K., Sumi, S. M., Bird, T. D., McEvoy-Bush, T., Boehnke, M., Schellenberg, G. <strong>Family with dominantly inherited ataxia, amyotrophy, and peripheral sensory loss: spinopontine atrophy or Machado-Joseph Azorean disease in another non-Portuguese family?</strong> Arch. Neurol. 47: 968-974, 1990.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/2396938/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">2396938</a>] [<a href="https://doi.org/10.1001/archneur.1990.00530090038011" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="2396938">Eto et al. (1990)</a> considered their family to resemble most that reported by <a href="#7" class="mim-tip-reference" title="Boller, F., Segarra, J. M. <strong>Spino-pontine degeneration.</strong> Europ. Neurol. 2: 356-373, 1969.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5808476/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5808476</a>] [<a href="https://doi.org/10.1159/000113812" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5808476">Boller and Segarra (1969)</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=5808476+2396938" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#109" class="mim-tip-reference" title="Takiyama, Y., Oyanagi, S., Kawashima, S., Sakamoto, H., Saito, K., Yoshida, M., Tsuji, S., Mizuno, Y., Nishizawa, M. <strong>A clinical and pathologic study of a large Japanese family with Machado-Joseph disease tightly linked to the DNA markers on chromosome 14q.</strong> Neurology 44: 1302-1308, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8035935/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8035935</a>] [<a href="https://doi.org/10.1212/wnl.44.7.1302" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8035935">Takiyama et al. (1994)</a> compared the clinical and pathologic features of SCA1 and SCA2 to those in a large Japanese family with Machado-Joseph disease that had previously been linked to markers on chromosome 14q. Although many of the clinical features and the age of onset were similar to those of SCA1 and SCA2, other features were more distinctive for Machado-Joseph disease. These included dystonia, difficulty in opening of the eyelids, slowness of movements, bulging eyes, and facial-lingual fasciculations. One autopsy showed few changes in either the inferior olive or the Purkinje cells, in sharp contrast to SCA1 and SCA2 where such changes are pronounced. The subthalamopallidal system of the MJD patient showed marked degeneration, which has not been described in SCA1 or SCA2. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8035935" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#94" class="mim-tip-reference" title="Seto, M., Tsujihata, M. <strong>Cluster of Machado-Joseph disease in a small rural town near Nagasaki City, Japan: clinical and genetic studies of two families. (Letter)</strong> J. Neurol. 246: 405-407, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10399876/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10399876</a>] [<a href="https://doi.org/10.1007/s004150050373" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10399876">Seto and Tsujihata (1999)</a> studied a cluster of MJD in a small rural town near Nagasaki City, Japan. They stated that <a href="#85" class="mim-tip-reference" title="Sakai, T., Ohta, M., Ishino, H. <strong>Joseph disease in a non-Portuguese family.</strong> Neurology 33: 74-80, 1983.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6681562/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6681562</a>] [<a href="https://doi.org/10.1212/wnl.33.1.74" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="6681562">Sakai et al. (1983)</a> described the first family with MJD in Japan, and that Japan had the largest number of reported MJD families in the world. One family studied by <a href="#94" class="mim-tip-reference" title="Seto, M., Tsujihata, M. <strong>Cluster of Machado-Joseph disease in a small rural town near Nagasaki City, Japan: clinical and genetic studies of two families. (Letter)</strong> J. Neurol. 246: 405-407, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10399876/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10399876</a>] [<a href="https://doi.org/10.1007/s004150050373" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10399876">Seto and Tsujihata (1999)</a> had 20 affected persons among 73 descending from an ancestor born in 1839. This ancestor had been told that he was a child of unknown non-Japanese parentage (probably Portuguese). The second family had 12 affected persons among 43 with a common ancestor born in 1897. Unsteady gait was the most frequent initial symptom. Age at onset varied from 11 to 51 years with a mean in males of 36.5 and in females of 39.7 years. Anticipation was observed in both families. Three patients had shown only ocular signs: nystagmus, external ophthalmoplegia, and/or blepharoptosis. Bulging eyes were found in only 4 patients. The authors stated that Nagasaki was the only open Japanese port during the Edo period (1635 to 1868). <a href="https://pubmed.ncbi.nlm.nih.gov/?term=10399876+6681562" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#59" class="mim-tip-reference" title="Livingstone, I. R., Sequeiros, J. <strong>Machado-Joseph disease in an American-Italian family.</strong> J. Neurogenet. 1: 185-188, 1984.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6536725/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6536725</a>] [<a href="https://doi.org/10.3109/01677068409107084" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="6536725">Livingstone and Sequeiros (1984)</a> noted that 28 families with Machado-Joseph disease had been described in the Azorean Islands, mainly Flores and Sao Miguel, and 3 non-Azorean families in northeast Portugal. <a href="#12" class="mim-tip-reference" title="Burt, T., Blumbergs, P., Currie, B. <strong>A dominant hereditary ataxia resembling Machado-Joseph disease in Arnhem Land, Australia.</strong> Neurology 43: 1750-1752, 1993.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8414025/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8414025</a>] [<a href="https://doi.org/10.1212/wnl.43.9.1750" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8414025">Burt et al. (1993)</a> described a dominantly inherited form of ataxia resembling Machado-Joseph disease in members of 4 families of the Arnhem Land Aboriginal people of northern Australia. Portuguese ancestry was possible, although not proven. <a href="#33" class="mim-tip-reference" title="Goldberg-Stern, H., D'jaldetti, R., Melamed, E., Gadoth, N. <strong>Machado-Joseph (Azorean) disease in a Yemenite Jewish family in Israel.</strong> Neurology 44: 1298-1301, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8035934/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8035934</a>] [<a href="https://doi.org/10.1212/wnl.44.7.1298" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8035934">Goldberg-Stern et al. (1994)</a> reported a family of Machado-Joseph disease in a Yemenite Jewish kindred that originated from a remote village named Ta'izz. This family, incidentally named Yoseph, had no documentation of Portuguese ancestry. Portuguese trade connections with the Yemenites most likely did not reach Ta'izz which is far from the coast and is almost inaccessible because of a wall of high mountains. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=6536725+8035934+8414025" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Oculomotor Abnormalities</em></strong></p><p>
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Among 65 patients with SCA1, SCA2, or SCA3, <a href="#10" class="mim-tip-reference" title="Burk, K., Abele, M., Fetter, M., Dichgans, J., Skalej, M., Laccone, F., Didierjean, O., Brice, A., Klockgether, T. <strong>Autosomal dominant cerebellar ataxia type I: clinical features and MRI in families with SCA1, SCA2 and SCA3.</strong> Brain 119: 1497-1505, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8931575/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8931575</a>] [<a href="https://doi.org/10.1093/brain/119.5.1497" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8931575">Burk et al. (1996)</a> found reduced saccade velocity in 56%, 100%, and 30% of patients, respectively. MRI showed severe olivopontocerebellar atrophy in SCA2, similar but milder changes in SCA1, and very mild atrophy with sparing of the olives in SCA3. Careful examination of 3 major criteria of eye movements, saccade amplitude, saccade velocity, and presence of gaze-evoked nystagmus, permitted <a href="#76" class="mim-tip-reference" title="Rivaud-Pechoux, S., Durr, A., Gaymard, B., Cancel, G., Ploner, C. J., Agid, Y., Brice, A., Pierrot-Deseilligny, C. <strong>Eye movement abnormalities correlate with genotype in autosomal dominant cerebellar ataxia type I.</strong> Ann. Neurol. 43: 297-302, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9506545/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9506545</a>] [<a href="https://doi.org/10.1002/ana.410430306" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9506545">Rivaud-Pechoux et al. (1998)</a> to assign over 90% of patients with SCA1, SCA2, or SCA3 to their genetically confirmed patient group. In SCA1, saccade amplitude was significantly increased, resulting in hypermetria. In SCA2, saccade velocity was markedly decreased. In SCA3, the most characteristic finding was the presence of gaze-evoked nystagmus. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=9506545+8931575" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In an investigation of oculomotor function, <a href="#13" class="mim-tip-reference" title="Buttner, N., Geschwind, D., Jen, J. C., Perlman, S., Pulst, S. M., Baloh, R. W. <strong>Oculomotor phenotypes in autosomal dominant ataxias.</strong> Arch. Neurol. 55: 1353-1357, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9779665/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9779665</a>] [<a href="https://doi.org/10.1001/archneur.55.10.1353" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9779665">Buttner et al. (1998)</a> found that all 3 patients with SCA1, all 7 patients with SCA3, and all 5 patients with SCA6 (<a href="/entry/183086">183086</a>) had gaze-evoked nystagmus. Three of 5 patients with SCA2 did not have gaze-evoked nystagmus, perhaps because they could not generate corrective fast components. Rebound nystagmus occurred in all SCA3 patients, 33% of SCA1 patients, 40% of SCA6 patients, and none of SCA2. Spontaneous downbeat nystagmus only occurred in SCA6. Peak saccade velocity was decreased in 100% of patients with SCA2, 1 patient with SCA1, and no patients with SCA3 or SCA6. Saccade hypermetria was found in all types, but was most common in SCA3. <a href="#11" class="mim-tip-reference" title="Burk, K., Fetter, M., Abele, M., Laccone, F., Brice, A., Dichgans, J., Klockgether, T. <strong>Autosomal dominant cerebellar ataxia type I: oculomotor abnormalities in families with SCA1, SCA2, and SCA3.</strong> J. Neurol. 246: 789-797, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10525976/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10525976</a>] [<a href="https://doi.org/10.1007/s004150050456" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10525976">Burk et al. (1999)</a> found that gaze-evoked nystagmus was not associated with SCA2. However, severe saccade slowing was highly characteristic of SCA2. Saccade velocity in SCA3 was normal to mildly reduced. The gain in vestibuloocular reflex was significantly impaired in SCA3 and SCA1. Eye movement disorders of SCA1 overlapped with both SCA2 and SCA3. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=10525976+9779665" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>The reticulotegmental nucleus of the pons (RTTG), also known as the nucleus of Bechterew, is a precerebellar nucleus important in the premotor oculomotor circuits crucial for the accuracy of horizontal saccades and the generation of horizontal smooth pursuit. By postmortem examination, <a href="#82" class="mim-tip-reference" title="Rub, U., Burk, K., Schols, L., Brunt, E. R., de Vos, R. A. I., Orozco Diaz, G., Gierga, K., Ghebremedhin, E., Schultz, C., Del Turco, D., Mittelbronn, M., Auburger, G., Deller, T., Braak, H. <strong>Damage to the reticulotegmental nucleus of the pons in spinocerebellar ataxia type 1, 2, and 3.</strong> Neurology 63: 1258-1263, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15477548/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15477548</a>] [<a href="https://doi.org/10.1212/01.wnl.0000140498.24112.8c" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15477548">Rub et al. (2004)</a> identified neuronal loss and astrogliosis in the RTTG in 1 of 2 SCA1 patients, 2 of 4 SCA2 patients, and 4 of 4 SCA3 patients that correlated with clinical findings of hypometric saccades and slowed and saccadic smooth pursuits. The 3 patients without these specific oculomotor findings had intact RTTG regions. The authors concluded that the neurodegeneration associated with SCA1, SCA2, and SCA3 affects premotor networks in addition to motor nuclei in a subset of patients. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15477548" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>In 19 of 27 (70%) patients with confirmed SCA types 1, 2, 3, 6, or 7 (<a href="/entry/164500">164500</a>), <a href="#120" class="mim-tip-reference" title="van de Warrenburg, B. P. C., Notermans, N. C., Schelhaas, H. J., van Alfen, N., Sinke, R. J., Knoers, N. V. A. M., Zwarts, M. J., Kremer, B. P. H. <strong>Peripheral nerve involvement in spinocerebellar ataxias.</strong> Arch. Neurol. 61: 257-261, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/14967775/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">14967775</a>] [<a href="https://doi.org/10.1001/archneur.61.2.257" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="14967775">van de Warrenburg et al. (2004)</a> found electrophysiologic evidence of peripheral nerve involvement. Eight patients (30%) had findings compatible with a dying-back axonopathy, whereas 11 patients (40%) had findings consistent with a primary neuronopathy involving dorsal root ganglion and/or anterior horn cells; the 2 types were clinically almost indistinguishable. Of 8 patients with SCA3, 5 had a neuronopathy and 4 had a sensorimotor axonopathy. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=14967775" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In a detailed neuropsychologic study, <a href="#49" class="mim-tip-reference" title="Kawai, Y., Takeda, A., Abe, Y., Washimi, Y., Tanaka, F., Sobue, G. <strong>Cognitive impairments in Machado-Joseph disease.</strong> Arch. Neurol. 61: 1757-1760, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15534186/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15534186</a>] [<a href="https://doi.org/10.1001/archneur.61.11.1757" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15534186">Kawai et al. (2004)</a> found that 16 Japanese MJD patients had verbal and visual memory deficits, impaired verbal fluency, and impaired visuospatial and constructional function compared to controls. In addition, the patients were more depressed and anxious than controls. There was no correlation between cognitive impairment and CAG repeat length. The findings were consistent with widespread dysfunction of the cerebral cortex and/or impairment of the cerebellar cortical circuits. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15534186" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#126" class="mim-tip-reference" title="Yeh, T.-H., Lu, C.-S., Chou, Y.-H. W., Chong, C.-C., Wu, T., Han, N.-H., Chen, R.-S. <strong>Autonomic dysfunction in Machado-Joseph disease.</strong> Arch. Neurol. 62: 630-636, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15824264/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15824264</a>] [<a href="https://doi.org/10.1001/archneur.62.4.630" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15824264">Yeh et al. (2005)</a> reported autonomic dysfunction among patients with MJD confirmed by genetic analysis. Ten (66%) of 15 patients reported at least 3 diverse autonomic symptoms, most commonly nocturia, cold intolerance, orthostatic dizziness, dry eyes, dry mouth, and impaired near vision. Electrophysiologic studies showed parasympathetic cardiovagal dysfunction in 71% of patients and sympathetic sudomotor dysfunction in 73% of patients. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15824264" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#26" class="mim-tip-reference" title="Franca, M. C., Jr., D'Abreu, A., Friedman, J. H., Nucci, A., Lopes-Cendes, I. <strong>Chronic pain in Machado-Joseph disease: a frequent and disabling symptom.</strong> Arch. Neurol. 64: 1767-1770, 2007.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18071041/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18071041</a>] [<a href="https://doi.org/10.1001/archneur.64.12.1767" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18071041">Franca et al. (2007)</a> found that 33 (47%) of 70 patients with MJD reported chronic pain, most often in the lumbar back and lower limbs. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=18071041" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#27" class="mim-tip-reference" title="Franca, M. C., Jr., D'Abreu, A., Nucci, A., Lopes-Cendes, I. <strong>Muscle excitability abnormalities in Machado-Joseph disease.</strong> Arch. Neurol. 65: 525-529, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18413477/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18413477</a>] [<a href="https://doi.org/10.1001/archneur.65.4.525" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18413477">Franca et al. (2008)</a> observed muscle excitability abnormalities in 41 (82%) of 50 men with MJD, 10 (20%) of whom reported muscle cramps as the presenting complaint. Fifteen patients had fasciculations on clinical exam, and 25 had fasciculations identified on EMG testing. Those with fasciculations had a higher frequency of peripheral neuropathy. <a href="#27" class="mim-tip-reference" title="Franca, M. C., Jr., D'Abreu, A., Nucci, A., Lopes-Cendes, I. <strong>Muscle excitability abnormalities in Machado-Joseph disease.</strong> Arch. Neurol. 65: 525-529, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18413477/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18413477</a>] [<a href="https://doi.org/10.1001/archneur.65.4.525" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18413477">Franca et al. (2008)</a> noted that damage to motor axons in classic motor neuron disease leads to collateral nerve sprouting with overexpression of ionic channels that results in spontaneous ectopic activity and muscle cramping. While this mechanism may be at work in some MJD patients, others may have cramps and/or fasciculations due to altered excitatory inputs from damaged corticospinal fibers. <a href="#47" class="mim-tip-reference" title="Kanai, K., Kuwabara, S. <strong>Motor nerve hyperexcitability and muscle cramps in Machado-Joseph disease. (Letter)</strong> Arch. Neurol. 66: 139 only, 2009.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19139316/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19139316</a>] [<a href="https://doi.org/10.1001/archneurol.2008.515" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="19139316">Kanai and Kuwabara (2009)</a> commented that they considered muscle cramps in MJD to be primarily a symptom of peripheral motor nerve sprouting and hyperexcitability, particularly in the early stages of the disease. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=18413477+19139316" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Clinical Variability</em></strong></p><p>
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<a href="#66" class="mim-tip-reference" title="Munchau, A., Dressler, D., Bhatia, K. P., Vogel, P., Zuhlke, C. <strong>Machado-Joseph disease presenting as severe generalised dystonia in a German patient. (Letter)</strong> J. Neurol. 246: 840-842, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10525985/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10525985</a>] [<a href="https://doi.org/10.1007/s004150050465" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10525985">Munchau et al. (1999)</a> described a German woman who presented with severe generalized dystonia beginning at the age of 18 years when she noticed involuntary twisting and cramping of her right hand and twisting of both feet shortly thereafter. Symptoms worsened when she was stressed. At the age of 19 years, she began to grimace when talking and laughing, and her speech became difficult to understand. Over a period of 2 years her symptoms deteriorated, and she became unable to walk without support. She was found to be heterozygous for the ATXN3 gene, with a CAG repeat length of 81 +/- 2 and 14 +/- 1 in the mutated expanded allele and in the normal allele, respectively. Remarkably, cerebellar function was normal apart from mild oculomotor abnormalities. Severe dystonia as a presenting feature had never been described in patients from Germany, where MJD represented 50% of autosomal dominant cerebellar ataxia (ADCA) cases. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10525985" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In a family of African descent in which 3 members presented with phenotypic features reminiscent of typical Parkinson disease (PD; <a href="/entry/168600">168600</a>), <a href="#36" class="mim-tip-reference" title="Gwinn-Hardy, K., Singleton, A., O'Suilleabhain, P., Boss, M., Nicholl, D., Adam, A., Hussey, J., Critchley, P., Hardy, J., Farrer, M. <strong>Spinocerebellar ataxia type 3 phenotypically resembling Parkinson disease in a black family.</strong> Arch. Neurol. 58: 296-299, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11176969/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11176969</a>] [<a href="https://doi.org/10.1001/archneur.58.2.296" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11176969">Gwinn-Hardy et al. (2001)</a> identified pathogenic expansions in the ATXN3 gene (<a href="/entry/607047">607047</a>). Features suggestive of PD included bradykinesis, facial masking, rigidity, postural instability, shuffling, asymmetric onset, dopamine responsiveness, and lack of atypical features often associated with SCA3. A fourth, mildly symptomatic patient also carried the repeat expansion. The authors suggested that the low numbers of repeats in this family (67-75; normal, 16-34) presenting with parkinsonism may be associated with ethnic background and that evaluation for SCA3 should be considered in similar cases. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11176969" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In a study of 412 individuals with MJD, <a href="#51" class="mim-tip-reference" title="Kieling, C., Prestes, P. R., Saraiva-Pereira, M. L., Jardim, L. B. <strong>Survival estimates for patients with Machado-Joseph disease (SCA3).</strong> Clin. Genet. 72: 543-545, 2007.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17894834/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17894834</a>] [<a href="https://doi.org/10.1111/j.1399-0004.2007.00910.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="17894834">Kieling et al. (2007)</a> found that the estimated mean survival time was 63.96 years, compared to 78.61 years in unaffected relatives. For a subset of 366 patients, mean age at onset was 36.37 years with a survival of 21.18 years. Early onset and increased CAG length predicted shorter overall survival times. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17894834" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#127" class="mim-tip-reference" title="Zeng, S., Zeng, J., He, M., Zeng, X., Zhou, Y., Liu, Z., Jiang, H., Tang, B., Wang, J. <strong>Chinese homozygous Machado-Joseph disease (MJD)/SCA3: a case report.</strong> J. Hum. Genet. 60: 157-160, 2015.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/25566755/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">25566755</a>] [<a href="https://doi.org/10.1038/jhg.2014.117" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="25566755">Zeng et al. (2015)</a> reported a Chinese man, born of consanguineous parents, who was homozygous for a pathogenic ATXN3 repeat expansion (71/71) and showed onset of symptoms at age 18 years. He initially developed gait disturbances and slurred speech. Several years later, he had spastic gait, dysphagia, nystagmus, saccade hypermetria, and mild hearing loss. Brain imaging did not show cerebellar or brainstem atrophy. His parents, who were in their mid forties, showed only mild symptoms of the disorder. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25566755" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>Machado-Joseph disease is an autosomal dominant disorder. <a href="#89" class="mim-tip-reference" title="Sequeiros, J., Coutinho, P. <strong>Genetic aspects of Machado-Joseph disease.</strong> Broteria-Genetica (Lisbon) 77: 137-147, 1981."None>Sequeiros and Coutinho (1981)</a> identified 9 cases of 'skipped generations' (penetrance = 94.5%).</p><p>Some individuals, usually born of consanguineous unions, may be homozygous for a pathogenic ATXN3 allele. These individuals usually show an earlier age at disease onset and more severe symptoms (summary by <a href="#127" class="mim-tip-reference" title="Zeng, S., Zeng, J., He, M., Zeng, X., Zhou, Y., Liu, Z., Jiang, H., Tang, B., Wang, J. <strong>Chinese homozygous Machado-Joseph disease (MJD)/SCA3: a case report.</strong> J. Hum. Genet. 60: 157-160, 2015.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/25566755/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">25566755</a>] [<a href="https://doi.org/10.1038/jhg.2014.117" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="25566755">Zeng et al., 2015</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25566755" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#21" class="mim-tip-reference" title="Dawson, D. M., Feudo, P., Zubick, H. H., Rosenberg, R., Fowler, H. <strong>Electro-oculographic findings in Machado-Joseph disease.</strong> Neurology 32: 1272-1276, 1982.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6890162/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6890162</a>] [<a href="https://doi.org/10.1212/wnl.32.11.1272" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="6890162">Dawson et al. (1982)</a> suggested that the electrooculogram may be useful in early detection. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6890162" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>The finding of 'intermediate alleles' presented a problem in the Portuguese MJD Predictive Testing Program. A second problem was the issue of homoallelism, i.e., homozygosity for 2 normal alleles with exactly the same (CAG)n length, which was found in about 10% of all test results. <a href="#62" class="mim-tip-reference" title="Maciel, P., Costa, M. C., Ferro, A., Rousseau, M., Santos, C. S., Gaspar, C., Barros, J., Rouleau, G. A., Coutinho, P., Sequeiros, J. <strong>Improvement in the molecular diagnosis of Machado-Joseph disease.</strong> Arch. Neurol. 58: 1821-1827, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11708990/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11708990</a>] [<a href="https://doi.org/10.1001/archneur.58.11.1821" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11708990">Maciel et al. (2001)</a> reported a study in which an affected patient carried a 71 and a 51 CAG repeat and 2 asymptomatic relatives carried the 51 CAG repeat and normal-size alleles. The results suggested that the 51 CAG repeat is not associated with disease. The intermediate alleles were not present in a large sample of the healthy population from the same region. Intragenic polymorphisms allowed distinction of the 2 different normal alleles in all cases of homoallelism. An improved protocol for molecular testing for MJD was proposed. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11708990" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>In 7 French autosomal dominant SCA families, previously excluded from linkage to the region of chromosome 6 carrying SCA1, <a href="#31" class="mim-tip-reference" title="Gispert, S., Twells, R., Orozco, G., Brice, A., Weber, J., Heredero, L., Scheufler, K., Riley, B., Allotey, R., Nothers, C., Hillermann, R., Lunkes, A., and 17 others. <strong>Chromosomal assignment of the second locus for autosomal dominant cerebellar ataxia (SCA2) to chromosome 12q23-24.1.</strong> Nature Genet. 4: 295-299, 1993.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8358438/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8358438</a>] [<a href="https://doi.org/10.1038/ng0793-295" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8358438">Gispert et al. (1993)</a> also excluded linkage to the region of chromosome 12 carrying the SCA2 locus (<a href="/entry/183090">183090</a>), thus providing evidence for the existence of a third SCA locus, SCA3. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8358438" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#102" class="mim-tip-reference" title="Stevanin, G., Le Guern, E., Ravise, N., Chneiweiss, H., Durr, A., Cancel, G., Vignal, A., Boch, A.-L., Ruberg, M., Penet, C., Pothin, Y., Lagroua, I., Haguenau, M., Rancurel, G., Weissenbach, J., Agid, Y., Brice, A. <strong>A third locus for autosomal dominant cerebellar ataxia type 1 maps to chromosome 14q24.3-qter: evidence for the existence of a fourth locus.</strong> Am. J. Hum. Genet. 54: 11-20, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8279460/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8279460</a>]" pmid="8279460">Stevanin et al. (1994)</a> reported linkage studies in 3 of these French families, in 2 of which location of the gene at 14q24.3-qter was possible. Combined analysis of the families placed the SCA3 locus in a 15-cM interval between markers D14S67 and D14S81. <a href="#101" class="mim-tip-reference" title="Stevanin, G., Cancel, G., Durr, A., Chneiweiss, H., Dubourg, O., Weissenbach, J., Cann, H. M., Agid, Y., Brice, A. <strong>The gene for spinal cerebellar ataxia 3 (SCA3) is located in a region of about 3 cM on chromosome 14q24.3-q32.2.</strong> Am. J. Hum. Genet. 56: 193-201, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7825578/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7825578</a>]" pmid="7825578">Stevanin et al. (1995)</a> narrowed the mapping of SCA3 to a 3-cM interval on 14q. In the third family, <a href="#102" class="mim-tip-reference" title="Stevanin, G., Le Guern, E., Ravise, N., Chneiweiss, H., Durr, A., Cancel, G., Vignal, A., Boch, A.-L., Ruberg, M., Penet, C., Pothin, Y., Lagroua, I., Haguenau, M., Rancurel, G., Weissenbach, J., Agid, Y., Brice, A. <strong>A third locus for autosomal dominant cerebellar ataxia type 1 maps to chromosome 14q24.3-qter: evidence for the existence of a fourth locus.</strong> Am. J. Hum. Genet. 54: 11-20, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8279460/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8279460</a>]" pmid="8279460">Stevanin et al. (1994)</a> excluded linkage to the sites of SCA1, SCA2, and SCA3, thus indicating the existence of a fourth ADCA type I locus. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=8279460+7825578" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In Japanese kindreds with MJD, <a href="#108" class="mim-tip-reference" title="Takiyama, Y., Nishizawa, M., Tanaka, H., Kawashima, S., Sakamoto, H., Karube, Y., Shimazaki, H., Soutome, M., Endo, K., Ohta, S., Kagawa, Y., Kanazawa, I., Mizuno, Y., Yoshida, M., Yuasa, T., Horikawa, Y., Oyanagi, K., Nagai, H., Kondo, T., Inuzuka, T., Onodera, O., Tsuji, S. <strong>The gene for Machado-Joseph disease maps to human chromosome 14q.</strong> Nature Genet. 4: 300-304, 1993.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8358439/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8358439</a>] [<a href="https://doi.org/10.1038/ng0793-300" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8358439">Takiyama et al. (1993)</a> assigned the disease locus to 14q24.3-q32 by genetic linkage to microsatellite loci D14S55 and D14S48; multipoint maximum lod score = 9.719. Using 4 microsatellite DNA polymorphisms (STRPs), <a href="#91" class="mim-tip-reference" title="Sequeiros, J., Silveira, I., Maciel, P., Coutinho, P., Manaia, A., Gaspar, C., Burlet, P., Loureiro, L., Guimaraes, J., Tanaka, H., Takiyama, Y., Sakamoto, H., Nishizawa, M., Nomura, Y., Segawa, M., Tsuji, S., Melki, J., Munnich, A. <strong>Genetic linkage studies of Machado-Joseph disease with chromosome 14q STRPs in 16 Portuguese-Azorean kindreds.</strong> Genomics 21: 645-648, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7959745/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7959745</a>] [<a href="https://doi.org/10.1006/geno.1994.1327" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7959745">Sequeiros et al. (1994)</a> likewise mapped the MJD gene to 14q. Using HOMOG, <a href="#91" class="mim-tip-reference" title="Sequeiros, J., Silveira, I., Maciel, P., Coutinho, P., Manaia, A., Gaspar, C., Burlet, P., Loureiro, L., Guimaraes, J., Tanaka, H., Takiyama, Y., Sakamoto, H., Nishizawa, M., Nomura, Y., Segawa, M., Tsuji, S., Melki, J., Munnich, A. <strong>Genetic linkage studies of Machado-Joseph disease with chromosome 14q STRPs in 16 Portuguese-Azorean kindreds.</strong> Genomics 21: 645-648, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7959745/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7959745</a>] [<a href="https://doi.org/10.1006/geno.1994.1327" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7959745">Sequeiros et al. (1994)</a> could find no evidence for heterogeneity with the 5 Japanese families in whom linkage had been reported. <a href="#99" class="mim-tip-reference" title="St. George-Hyslop, P., Rogaeva, E., Huterer, J., Tsuda, T., Santos, J., Haines, J. L., Schlumpf, K., Rogaev, E. I., Liang, Y., Crapper McLachlan, D. R., Kennedy, J., Weissenbach, J., Billingsley, G. D., Cox, D. W., Lang, A. E., Wherrett, J. R. <strong>Machado-Joseph disease in pedigrees of Azorean descent is linked to chromosome 14.</strong> Am. J. Hum. Genet. 55: 120-125, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8023841/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8023841</a>]" pmid="8023841">St. George-Hyslop et al. (1994)</a> provided evidence that MJD in 5 pedigrees of Azorean descent was also linked to 14q in an 18-cM region between the markers D14S67 and AACT (<a href="/entry/107280">107280</a>); multipoint lod score = 7.00 near D14S81. They also reported molecular evidence for homozygosity at the MJD locus in an MJD-affected subject with severe, early-onset symptoms. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=8023841+7959745+8358439" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#116" class="mim-tip-reference" title="Twist, E. C., Casaubon, L. K., Ruttledge, M. H., Rao, V. S., Macleod, P. M., Radvany, J., Zhao, Z., Rosenberg, R. N., Farrer, L. A., Rouleau, G. A. <strong>Machado Joseph disease maps to the same region of chromosome 14 as the spinocerebellar ataxia type 3 locus.</strong> J. Med. Genet. 32: 25-31, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7897622/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7897622</a>] [<a href="https://doi.org/10.1136/jmg.32.1.25" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7897622">Twist et al. (1995)</a> studied 6 MJD families of Portuguese/Azorean origin and 1 of Brazilian origin, using 9 microsatellite markers mapped to 14q24.3-q32. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7897622" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>A fourth SCA locus was suggested by the report of <a href="#115" class="mim-tip-reference" title="Twells, R., Yenchitsomanus, P.-T., Sirinavin, C., Allotey, R., Poungvarin, N., Viriyavejakul, A., Cemal, C., Weber, J., Farrall, M., Rodprasert, P., Prayoonwiwat, N., Williamson, R., Chamberlain, S. <strong>Autosomal dominant cerebellar ataxia with dementia: evidence for a fourth disease locus.</strong> Hum. Molec. Genet. 3: 177-180, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8162021/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8162021</a>] [<a href="https://doi.org/10.1093/hmg/3.1.177" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8162021">Twells et al. (1994)</a> in which linkage to the regions of chromosomes 6, 12, and 14, where forms of SCA had previously been mapped, was excluded in a large Thai kindred in which dominant cerebellar ataxia was often combined with frontal lobe signs and dementia. Similarly, <a href="#60" class="mim-tip-reference" title="Lopes-Cendes, I., Andermann, E., Rouleau, G. A. <strong>Evidence for the existence of a fourth dominantly inherited spinocerebellar ataxia locus.</strong> Genomics 21: 270-274, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8088802/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8088802</a>] [<a href="https://doi.org/10.1006/geno.1994.1257" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8088802">Lopes-Cendes et al. (1994)</a> excluded linkage with these 3 loci in a large French-Canadian kindred with 4 generations of living affected individuals in 4 generations. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=8088802+8162021" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#48" class="mim-tip-reference" title="Kawaguchi, Y., Okamoto, T., Taniwaki, M., Aizawa, M., Inoue, M., Katayama, S., Kawakami, H., Nakamura, S., Nishimura, M., Akiguchi, I., Kimura, J., Narumiya, S., Kakizuka, A. <strong>CAG expansions in a novel gene for Machado-Joseph disease at chromosome 14q32.1.</strong> Nature Genet. 8: 221-228, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7874163/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7874163</a>] [<a href="https://doi.org/10.1038/ng1194-221" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7874163">Kawaguchi et al. (1994)</a> identified a common mutation in the MJD gene as the cause of Machado-Joseph disease. In normal individuals, the gene was found to contain between 13 and 36 CAG repeats, whereas most of the patients with clinically diagnosed MJD and all of the affected members of a family with the clinical and pathologic diagnosis of MJD showed expansion of the repeat number to the range of 68 to 79 (<a href="/entry/607047#0001">607047.0001</a>). <a href="#88" class="mim-tip-reference" title="Schols, L., Vieira-Saecker, A. M. M., Schols, S., Przuntek, H., Epplen, J. T., Riess, O. <strong>Trinucleotide expansion within the MJD1 gene presents clinically as spinocerebellar ataxia and occurs most frequently in German SCA patients.</strong> Hum. Molec. Genet. 4: 1001-1005, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7655453/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7655453</a>] [<a href="https://doi.org/10.1093/hmg/4.6.1001" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7655453">Schols et al. (1995)</a> provided definitive proof that mutation in the ATXN3 gene cause SCA3. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7874163+7655453" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#32" class="mim-tip-reference" title="Giunti, P., Sweeney, M. G., Harding, A. E. <strong>Detection of the Machado-Joseph disease/spinocerebellar ataxia three trinucleotide repeat expansion in families with autosomal dominant motor disorders, including the Drew family of Walworth.</strong> Brain 118: 1077-1085, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7496771/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7496771</a>] [<a href="https://doi.org/10.1093/brain/118.5.1077" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7496771">Giunti et al. (1995)</a> surveyed members of 63 families with a variety of autosomal dominant late-onset cerebellar ataxias for the CAG repeat expansion described in association with Machado-Joseph disease. The MJD mutation was identified in 9 families segregating progressive adult-onset cerebellar degeneration with variable supranuclear ophthalmoplegia, optic atrophy, mild dementia, peripheral neuropathy, or extrapyramidal dysfunction, corresponding to Harding's classification of ADCA type I (<a href="#38" class="mim-tip-reference" title="Harding, A. E. <strong>The clinical features and classification of the late onset autosomal dominant cerebellar ataxias: a study of 11 families, including descendants of 'the Drew family of Walworth'.</strong> Brain 105: 1-28, 1982.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7066668/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7066668</a>] [<a href="https://doi.org/10.1093/brain/105.1.1" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7066668">Harding, 1982</a>). Most of the patients with ADCA type I have olivopontocerebellar atrophy at autopsy. <a href="#32" class="mim-tip-reference" title="Giunti, P., Sweeney, M. G., Harding, A. E. <strong>Detection of the Machado-Joseph disease/spinocerebellar ataxia three trinucleotide repeat expansion in families with autosomal dominant motor disorders, including the Drew family of Walworth.</strong> Brain 118: 1077-1085, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7496771/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7496771</a>] [<a href="https://doi.org/10.1093/brain/118.5.1077" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7496771">Giunti et al. (1995)</a> noted that this mutation was also identified in a further family affected with parkinsonism, peripheral neuropathy and dystonia but little cerebellar disease. The origins of these 10 families were the United Kingdom, India, Pakistan, the West Indies, France, Brazil, and Ghana. The authors could find no clinical feature that distinguished ADCA type I patients with the SCA3 mutation from those who did not have it. <a href="#32" class="mim-tip-reference" title="Giunti, P., Sweeney, M. G., Harding, A. E. <strong>Detection of the Machado-Joseph disease/spinocerebellar ataxia three trinucleotide repeat expansion in families with autosomal dominant motor disorders, including the Drew family of Walworth.</strong> Brain 118: 1077-1085, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7496771/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7496771</a>] [<a href="https://doi.org/10.1093/brain/118.5.1077" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7496771">Giunti et al. (1995)</a> found that the CAG repeat length ranged from 13 to 41 copies on normal chromosomes and 62 to 80 copies on affected chromosomes. The families in which <a href="#32" class="mim-tip-reference" title="Giunti, P., Sweeney, M. G., Harding, A. E. <strong>Detection of the Machado-Joseph disease/spinocerebellar ataxia three trinucleotide repeat expansion in families with autosomal dominant motor disorders, including the Drew family of Walworth.</strong> Brain 118: 1077-1085, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7496771/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7496771</a>] [<a href="https://doi.org/10.1093/brain/118.5.1077" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7496771">Giunti et al. (1995)</a> detected the Machado-Joseph disease trinucleotide repeat expansion included the historic 'Drew family of Walworth' (<a href="#38" class="mim-tip-reference" title="Harding, A. E. <strong>The clinical features and classification of the late onset autosomal dominant cerebellar ataxias: a study of 11 families, including descendants of 'the Drew family of Walworth'.</strong> Brain 105: 1-28, 1982.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7066668/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7066668</a>] [<a href="https://doi.org/10.1093/brain/105.1.1" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7066668">Harding, 1982</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7496771+7066668" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Since some clinical features of MJD overlap with those of SCA, <a href="#88" class="mim-tip-reference" title="Schols, L., Vieira-Saecker, A. M. M., Schols, S., Przuntek, H., Epplen, J. T., Riess, O. <strong>Trinucleotide expansion within the MJD1 gene presents clinically as spinocerebellar ataxia and occurs most frequently in German SCA patients.</strong> Hum. Molec. Genet. 4: 1001-1005, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7655453/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7655453</a>] [<a href="https://doi.org/10.1093/hmg/4.6.1001" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7655453">Schols et al. (1995)</a> sought MJD mutations in 38 German families with autosomal dominant SCA. The MJD (CAG)n trinucleotide expansion was identified in 19 families. In contrast, the trinucleotide expansion was not observed in 21 ataxia patients without a family history of the disease. Analysis of the (CAG)n repeat length in 30 patients revealed an inverse correlation with the age of onset. The (CAG)n stretch of the affected allele varied between 67 and 78 trinucleotide units; the normal alleles carried between 12 and 28 simple repeats. These results demonstrated that the MJD mutation causes the disease phenotype of most SCA patients in Germany. <a href="#87" class="mim-tip-reference" title="Schols, L., Amoiridis, G., Langkafel, M., Buttner, T., Przuntek, H., Riess, O., Vieira-Saecker, A. M., Epplen, J. T. <strong>Machado-Joseph disease mutations as the genetic basis of most spinocerebellar ataxias in Germany.</strong> J. Neurol. Neurosurg. Psychiat. 59: 449-450, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7561932/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7561932</a>] [<a href="https://doi.org/10.1136/jnnp.59.4.449" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7561932">Schols et al. (1995)</a> pointed out that in SCA3 as observed in Germany, features characteristic of Machado-Joseph disease, such as dystonia, bulging eyes, and faciolingual fasciculations, are rare. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7561932+7655453" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#23" class="mim-tip-reference" title="Durr, A., Stevanin, G., Cancel, G., Duyckaerts, C., Abbas, N., Didierjean, O., Chneiweiss, H., Benomar, A., Lyon-Caen, O., Julien, J., Serdaru, M., Penet, C., Agid, Y., Brice, A. <strong>Spinocerebellar ataxia 3 and Machado-Joseph disease: clinical, molecular, and neuropathological features.</strong> Ann. Neurol. 39: 490-499, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8619527/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8619527</a>] [<a href="https://doi.org/10.1002/ana.410390411" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8619527">Durr et al. (1996)</a> screened 173 index patients with adult-onset cerebellar ataxia of whom 125 were classified as ADCA type I (cerebellar signs with supranuclear ophthalmoplegia, extrapyramidal signs, dementia, and amyotrophy); 9 of whom were ADCA type II (cerebellar ataxia with retinal degeneration in all family members); and 4 were ADCA type III (pure cerebellar signs after a disease duration of more than 10 years). The SCA3-MJD mutation represented 28% of all their ADCA type I families, whereas SCA1 only accounted for 13% in their population. The number of CAG repeats in the expanded allele ranged from 64 to 82 with a median of 73. In contrast, normal alleles contained between 14 and 40 CAG repeats. The mean expansion between generations was +0.86 CAG repeat units without a statistically significant difference between paternally and maternally transmitted alleles. <a href="#23" class="mim-tip-reference" title="Durr, A., Stevanin, G., Cancel, G., Duyckaerts, C., Abbas, N., Didierjean, O., Chneiweiss, H., Benomar, A., Lyon-Caen, O., Julien, J., Serdaru, M., Penet, C., Agid, Y., Brice, A. <strong>Spinocerebellar ataxia 3 and Machado-Joseph disease: clinical, molecular, and neuropathological features.</strong> Ann. Neurol. 39: 490-499, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8619527/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8619527</a>] [<a href="https://doi.org/10.1002/ana.410390411" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8619527">Durr et al. (1996)</a> found no correlation between the CAG repeat length and the tendency to expansion. All SCA3 patients had cerebellar ataxia; 46% had extensor plantar responses; 55% had decreased vibratory sensation; and supranuclear ophthalmoplegia was present in 47% of the patients. Dystonia and parkinsonian signs were only found in 18% of the patients. Two of 49 patients had retinal degeneration; 60% of patients had axonal neuropathy. Bulging eyes were noticed in 23% of SCA3 patients, which was similar to the frequency observed in SCA1 patients. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8619527" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#61" class="mim-tip-reference" title="Lopes-Cendes, I., Teive, H. G. A., Cardoso, F., Viana, E. M., Calcagnotto, M. E., da Costa, J. C., Trevisol-Bittencourt, P. C., Maciel, J. A., Rousseau, M., Santos, A. S., Araujo, A. Q. C., Rouleau, G. A. <strong>Molecular characteristics of Machado-Joseph disease mutation in 25 newly described Brazilian families.</strong> Braz. J. Genet. 20: 717-724, 1997."None>Lopes-Cendes et al. (1997)</a> reported 25 unrelated Brazilian families with MJD. Molecular analysis showed that normal alleles ranged from 12 to 33 CAG repeats, whereas expanded pathogenic alleles ranged from 66 to 78 CAG repeats. There was a significant negative correlation between age at onset and length of CAG tract. However, repeat contractions were also detected, and <a href="#61" class="mim-tip-reference" title="Lopes-Cendes, I., Teive, H. G. A., Cardoso, F., Viana, E. M., Calcagnotto, M. E., da Costa, J. C., Trevisol-Bittencourt, P. C., Maciel, J. A., Rousseau, M., Santos, A. S., Araujo, A. Q. C., Rouleau, G. A. <strong>Molecular characteristics of Machado-Joseph disease mutation in 25 newly described Brazilian families.</strong> Braz. J. Genet. 20: 717-724, 1997."None>Lopes-Cendes et al. (1997)</a> estimated that only 40% of the variation in age at disease onset could be attributed to length of the expanded repeat.</p><p><a href="#72" class="mim-tip-reference" title="Ramesar, R. S., Bardien, S., Beighton, P., Bryer, A. <strong>Expanded CAG repeats in spinocerebellar ataxia (SCA1) segregate with distinct haplotypes in South African families.</strong> Hum. Genet. 100: 131-137, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9225982/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9225982</a>] [<a href="https://doi.org/10.1007/s004390050478" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9225982">Ramesar et al. (1997)</a> investigated 14 South African kindreds and 22 sporadic individuals with SCA for expanded SCA1 (<a href="/entry/601556#0001">601556.0001</a>) and MJD repeats. The authors stated that SCA1 mutations accounted for 43% of known ataxia families in the Western Cape region of South Africa. They found that expanded SCA1 and CAG repeats cosegregated with the disorder in 6 of the families, 5 of mixed ancestry and 1 Caucasian, and were also observed in a sporadic case from the indigenous Black African population. The use of the microsatellite markers D6S260, D6S89, and D6S274 provided evidence that the expanded SCA1 repeats segregated with 3 distinct haplotypes in the 6 families. None of the families nor the sporadic individuals showed expansion of the MJD repeat. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9225982" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Studying 77 German families with autosomal dominant cerebellar ataxia of SCA types 1, 2, 3, and 6 (<a href="/entry/183086">183086</a>), <a href="#86" class="mim-tip-reference" title="Schols, L., Amoiridis, G., Buttner, T., Przuntek, H., Epplen, J. T., Riess, O. <strong>Autosomal dominant cerebellar ataxia: phenotypic differences in genetically defined subtypes?</strong> Ann. Neurol. 42: 924-932, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9403486/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9403486</a>] [<a href="https://doi.org/10.1002/ana.410420615" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9403486">Schols et al. (1997)</a> found that the SCA1 mutation accounted for 9%, SCA2 for 10%, SCA3 for 42%, and SCA6 for 22%. There was no family history of ataxia in 7 of 27 SCA6 patients. Age at onset correlated inversely with repeat length in all subtypes. Yet the average effect of 1 CAG unit on age of onset was different for each SCA subtype. <a href="#86" class="mim-tip-reference" title="Schols, L., Amoiridis, G., Buttner, T., Przuntek, H., Epplen, J. T., Riess, O. <strong>Autosomal dominant cerebellar ataxia: phenotypic differences in genetically defined subtypes?</strong> Ann. Neurol. 42: 924-932, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9403486/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9403486</a>] [<a href="https://doi.org/10.1002/ana.410420615" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9403486">Schols et al. (1997)</a> compared clinical, electrophysiologic, and magnetic resonance imaging (MRI) findings to identify phenotypic characteristics of genetically defined SCA subtypes. Slow saccades, hyporeflexia, myoclonus, and action tremor suggested SCA2. SCA3 patients frequently developed diplopia, severe spasticity or pronounced peripheral neuropathy, and impaired temperature discrimination, apart from ataxia. SCA6 presented with a predominantly cerebellar syndrome, and patients often had onset after 55 years of age. SCA1 was characterized by markedly prolonged peripheral and central motor conduction times in motor evoked potentials. MRI scans showed pontine and cerebellar atrophy in SCA1 and SCA2. In SCA3, enlargement of the fourth ventricle was the main sequel of atrophy. SCA6 presented with pure cerebellar atrophy on MRI. Overlap between the 4 SCA subtypes was broad, however. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9403486" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#48" class="mim-tip-reference" title="Kawaguchi, Y., Okamoto, T., Taniwaki, M., Aizawa, M., Inoue, M., Katayama, S., Kawakami, H., Nakamura, S., Nishimura, M., Akiguchi, I., Kimura, J., Narumiya, S., Kakizuka, A. <strong>CAG expansions in a novel gene for Machado-Joseph disease at chromosome 14q32.1.</strong> Nature Genet. 8: 221-228, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7874163/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7874163</a>] [<a href="https://doi.org/10.1038/ng1194-221" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7874163">Kawaguchi et al. (1994)</a> found a negative correlation between age of onset and CAG repeat numbers in MJD. Southern blot analyses and genomic cloning demonstrated the existence of related genes and raised the possibility that similar abnormalities in related genes may give rise to diseases similar to MJD. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7874163" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#64" class="mim-tip-reference" title="Maruyama, H., Nakamura, S., Matsuyama, Z., Sakai, T., Doyu, M., Sobue, G., Seto, M., Tsujihata, M., Oh-i, T., Nishio, T., Sunohara, N., Takahashi, R., and 11 others. <strong>Molecular features of the CAG repeats and clinical manifestation of Machado-Joseph disease.</strong> Hum. Molec. Genet. 4: 807-812, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7633439/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7633439</a>] [<a href="https://doi.org/10.1093/hmg/4.5.807" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7633439">Maruyama et al. (1995)</a> examined the molecular features of the CAG repeats and the clinical manifestations in 90 MJD individuals from 62 independent Japanese MJD families and found that the MJD repeat length was inversely correlated with the age of onset (r = -0.87). The MJD chromosomes contained 61-84 repeat units, whereas normal chromosomes displayed 14-34 repeats. In the normal chromosomes, 14 repeat units were the most common and the shortest. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7633439" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#107" class="mim-tip-reference" title="Takiyama, Y., Igarashi, S., Rogaeva, E. A., Endo, K., Rogaev, E. I., Tanaka, H., Sherrington, R., Sanpei, K., Liang, Y., Saito, M., Tsuda, T., Takano, H., and 15 others. <strong>Evidence for inter-generational instability in the CAG repeat in the MJD1 gene and for conserved haplotypes at flanking markers amongst Japanese and Caucasian subjects with Machado-Joseph disease.</strong> Hum. Molec. Genet. 4: 1137-1146, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8528200/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8528200</a>] [<a href="https://doi.org/10.1093/hmg/4.7.1137" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8528200">Takiyama et al. (1995)</a> examined the size of the (CAG)n repeat array in the 3-prime end of the ATXN3 gene and the haplotype at a series of microsatellite markers surrounding the ATXN3 gene in a large cohort of Japanese and Caucasian subjects with MJD. Expansion of the array from the normal range of 14-37 repeats to 68-84 repeats was found, with no instances of expansions intermediate in size between those of the normal and MJD affected groups. The expanded allele associated with MJD displayed intergenerational instability, particularly in male meiosis, and this instability was associated with the clinical phenomenon of anticipation. The size of the expanded allele was not only inversely correlated with the age-of-onset of MJD, but was also correlated with the frequency of other clinical features, such as pseudoexophthalmos and pyramidal signs were more frequent in subjects with larger repeats. The disease phenotype was significantly more severe and had an early age of onset (16 years) in a subject homozygous for the expanded allele, which contrasts with Huntington disease (HD; <a href="/entry/143100">143100</a>), in which the homozygous subject has a disorder indistinguishable from that in the heterozygous subject. The observation in MJD suggests that the expanded allele may exert its effect either by a dominant-negative effect (putatively excluded in HD) or by a gain-of-function effect as proposed for HD. Japanese and Caucasian subjects affected with MJD shared haplotypes at several markers surrounding the ATXN3 gene, these markers being uncommon in the normal Japanese and Caucasian populations, thus suggesting the existence either of common founders in these populations or of chromosomes susceptible to pathologic expansion of the CAG repeat in the ATXN3 gene. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8528200" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#73" class="mim-tip-reference" title="Ranum, L. P. W., Lundgren, J. K., Schut, L. J., Ahrens, M. J., Perlman, S., Aita, J., Bird, T. D., Gomez, C., Orr, H. T. <strong>Spinocerebellar ataxia type 1 and Machado-Joseph disease: incidence of CAG expansions among adult-onset ataxia patients from 311 families with dominant, recessive, or sporadic ataxia.</strong> Am. J. Hum. Genet. 57: 603-608, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7668288/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7668288</a>]" pmid="7668288">Ranum et al. (1995)</a> made use of the fact that the genes involved in 2 forms of autosomal dominant ataxia, that for MJD and that for SCA1, have been isolated to assess the frequency of trinucleotide repeat expansions among individuals diagnosed with ataxia. They collected and analyzed DNA from individuals with both disorders. In both cases, the genes responsible for the disorder were found to have an expansion of an unstable CAG trinucleotide repeat. These individuals represented 311 families with adult-onset ataxia of unknown etiology, of which 149 families had dominantly inherited ataxia. <a href="#73" class="mim-tip-reference" title="Ranum, L. P. W., Lundgren, J. K., Schut, L. J., Ahrens, M. J., Perlman, S., Aita, J., Bird, T. D., Gomez, C., Orr, H. T. <strong>Spinocerebellar ataxia type 1 and Machado-Joseph disease: incidence of CAG expansions among adult-onset ataxia patients from 311 families with dominant, recessive, or sporadic ataxia.</strong> Am. J. Hum. Genet. 57: 603-608, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7668288/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7668288</a>]" pmid="7668288">Ranum et al. (1995)</a> found that of these, 3% had SCA1 trinucleotide repeat expansions, whereas 21% were positive for the MJD trinucleotide expansion. For the 57 patients with MJD trinucleotide repeat expansions, strong inverse correlation between CAG repeat size and age at onset was observed (r = -0.838). Among the MJD patients, the normal and affected ranges of CAG repeat size were 14 to 40 and 68 to 82 repeats, respectively. For SCA1, the normal and affected ranges were much closer, namely 19 to 38 and 40 to 81 CAG repeats, respectively. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7668288" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#14" class="mim-tip-reference" title="Cancel, G., Abbas, N., Stevanin, G., Durr, A., Chneiweiss, H., Neri, C., Duyckaerts, C., Penet, C., Cann, H. M., Agid, Y., Brice, A. <strong>Marked phenotypic heterogeneity associated with expansion of a CAG repeat sequence at the spinocerebellar ataxia 3/Machado-Joseph disease locus.</strong> Am. J. Hum. Genet. 57: 809-816, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7573040/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7573040</a>]" pmid="7573040">Cancel et al. (1995)</a> documented the marked phenotypic heterogeneity associated with expansion of the CAG repeat sequence at the SCA3/MJD locus. They studied 3 French families with type I autosomal dominant cerebellar ataxia and a French family with neuropathologic findings suggesting the ataxochoreic form of dentatorubropallidoluysian atrophy (DRPLA; <a href="/entry/125370">125370</a>). A strong correlation was found between size of the expanded CAG repeat and age at onset of clinical disease. Instability of the expanded triplet repeat was not found to be affected by sex of the parent transmitting the mutation. Both somatic and gonadal mosaicism for alleles carrying expanded trinucleotide repeats was found. The 4 French families had no known Portuguese ancestry. Faciolingual myokymia, said to be a hallmark of MJD, increased tendon reflexes, ophthalmoplegia, and dystonia occur significantly more frequently among Azorean MJD patients, while decreased vibratory sense and dementia were found more often among the French cerebellar ataxia type I patients. Myoclonus, present in 1 of the 5 patients in the French family with the DRPLA-like disorder, had never been reported in SCA3 or MJD kindreds. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7573040" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#41" class="mim-tip-reference" title="Igarashi, S., Takiyama, Y., Cancel, G., Rogaeva, E. A., Sasaki, H., Wakisaka, A., Zhou, Y.-X., Takano, H., Endo, K., Sanpei, K., Oyake, M., Tanaka, H., and 17 others. <strong>Intergenerational instability of the CAG repeat of the gene for Machado-Joseph disease (MJD1) is affected by the genotype of the normal chromosome: implications for the molecular mechanisms of the instability of the CAG repeat.</strong> Hum. Molec. Genet. 5: 923-932, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8817326/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8817326</a>] [<a href="https://doi.org/10.1093/hmg/5.7.923" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8817326">Igarashi et al. (1996)</a> investigated the association of intergenerational instability of the expanded CAG repeat in MJD with a CAG/CAA polymorphism in the CAG repeat and a CGG/GGG polymorphism at the 3-prime end of the CAG array. Their results strongly suggested that an interallelic interaction is involved in the intergenerational instability of the expanded CAG repeat. <a href="#41" class="mim-tip-reference" title="Igarashi, S., Takiyama, Y., Cancel, G., Rogaeva, E. A., Sasaki, H., Wakisaka, A., Zhou, Y.-X., Takano, H., Endo, K., Sanpei, K., Oyake, M., Tanaka, H., and 17 others. <strong>Intergenerational instability of the CAG repeat of the gene for Machado-Joseph disease (MJD1) is affected by the genotype of the normal chromosome: implications for the molecular mechanisms of the instability of the CAG repeat.</strong> Hum. Molec. Genet. 5: 923-932, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8817326/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8817326</a>] [<a href="https://doi.org/10.1093/hmg/5.7.923" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8817326">Igarashi et al. (1996)</a> reported that normal chromosomes with the CGG allele are more frequently associated with larger CAG repeats than normal chromosomes with the GGG allele. They also reported that 80 of 88 independent MJD chromosomes had the CGG allele, which is in striking contrast to the CGG allele frequency in the normal chromosome. <a href="#41" class="mim-tip-reference" title="Igarashi, S., Takiyama, Y., Cancel, G., Rogaeva, E. A., Sasaki, H., Wakisaka, A., Zhou, Y.-X., Takano, H., Endo, K., Sanpei, K., Oyake, M., Tanaka, H., and 17 others. <strong>Intergenerational instability of the CAG repeat of the gene for Machado-Joseph disease (MJD1) is affected by the genotype of the normal chromosome: implications for the molecular mechanisms of the instability of the CAG repeat.</strong> Hum. Molec. Genet. 5: 923-932, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8817326/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8817326</a>] [<a href="https://doi.org/10.1093/hmg/5.7.923" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8817326">Igarashi et al. (1996)</a> investigated the effect of gender on the intergenerational instability of the expanded CAG repeat. They obtained significant evidence that the expanded CAG repeats were less stable in paternal transmission than in maternal transmission. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8817326" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Size of the expanded repeat and gene dosage are factors in the severity and early onset of MJD. Another factor pointed out by <a href="#50" class="mim-tip-reference" title="Kawakami, H., Maruyama, H., Nakamura, S., Kawaguchi, Y., Kakizuka, A., Doyu, M., Sobue, G. <strong>Unique features of the CAG repeats in Machado-Joseph disease. (Letter)</strong> Nature Genet. 9: 344-345, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7795637/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7795637</a>] [<a href="https://doi.org/10.1038/ng0495-344" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7795637">Kawakami et al. (1995)</a> is gender. In a total of 14 sib pairs, the mean of the differences in age of onset between the sibs of different sexes was 12.7 +/-1.7 (n = 7) and between the sibs of the same sex was 3.9 +/-1.7 (n = 7). The difference was statistically significant, whereas the variance in length of CAG repeats between these 2 groups was not significant. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7795637" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#118" class="mim-tip-reference" title="van Alfen, N., Sinke, R. J., Zwarts, M. J., Gabreels-Festen, A., Praamstra, P., Kremer, B. P. H., Horstink, M. W. I. M. <strong>Intermediate CAG repeat lengths (53,54) for MJD/SCA3 are associated with an abnormal phenotype.</strong> Ann. Neurol. 49: 805-808, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11409435/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11409435</a>] [<a href="https://doi.org/10.1002/ana.1089" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11409435">Van Alfen et al. (2001)</a> reported a Dutch family in which 4 members in 2 generations had intermediate repeat lengths (53 and 54) in the ATXN3 gene. All but the youngest had a restless legs syndrome with fasciculations and a sensorimotor axonal polyneuropathy. The authors concluded that intermediate repeat lengths can be pathogenic and may predispose for restless legs and peripheral nerve disorder. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11409435" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#119" class="mim-tip-reference" title="van de Warrenburg, B. P. C., Hendriks, H., Durr, A., van Zuijlen, M. C. A., Stevanin, G., Camuzat, A., Sinke, R. J., Brice, A., Kremer, B. P. H. <strong>Age at onset variance analysis in spinocerebellar ataxias: a study in a Dutch-French cohort.</strong> Ann. Neurol. 57: 505-512, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15747371/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15747371</a>] [<a href="https://doi.org/10.1002/ana.20424" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15747371">Van de Warrenburg et al. (2005)</a> applied statistical analysis to examine the relationship between age at onset and number of expanded triplet repeats from a Dutch-French cohort of 802 patients with SCA1 (138 patients), SCA2 (166 patients), SCA3 (342 patients), SCA6 (53 patients), and SCA7 (103 patients). The size of the expanded repeat explained 66 to 75% of the variance in age at onset for SCA1, SCA2, and SCA7, but less than 50% for SCA3 and SCA6. The relation between age at onset and CAG repeat was similar for all groups except for SCA2, suggesting that the polyglutamine repeat in the ataxin-2 protein exerts its pathologic effect in a different way. A contribution of the nonexpanded allele to age at onset was observed for only SCA1 and SCA6. <a href="#119" class="mim-tip-reference" title="van de Warrenburg, B. P. C., Hendriks, H., Durr, A., van Zuijlen, M. C. A., Stevanin, G., Camuzat, A., Sinke, R. J., Brice, A., Kremer, B. P. H. <strong>Age at onset variance analysis in spinocerebellar ataxias: a study in a Dutch-French cohort.</strong> Ann. Neurol. 57: 505-512, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15747371/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15747371</a>] [<a href="https://doi.org/10.1002/ana.20424" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15747371">Van de Warrenburg et al. (2005)</a> acknowledged that their results were purely mathematical, but suggested that they reflected biologic variations among the diseases. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15747371" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#68" class="mim-tip-reference" title="Padiath, Q. S., Srivastava, A. K., Roy, S., Jain, S., Brahmachari, S. K. <strong>Identification of a novel 45 repeat unstable allele associated with a disease phenotype at the MJD1/SCA3 locus.</strong> Am. J. Med. Genet. Neuropsychiat. Genet. 133B: 124-126, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15457499/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15457499</a>] [<a href="https://doi.org/10.1002/ajmg.b.30088" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15457499">Padiath et al. (2005)</a> reported a 3-generation Indian pedigree in which the proband had 45 CAG repeats in the ATXN3 gene. The proband had clinical features of spinocerebellar ataxia as well as signs of cerebellar and brainstem atrophy. The 45-repeat allele was unstable on intergenerational transmission and was associated with a haplotype found in the majority of MJD/SCA3 patients worldwide. <a href="#68" class="mim-tip-reference" title="Padiath, Q. S., Srivastava, A. K., Roy, S., Jain, S., Brahmachari, S. K. <strong>Identification of a novel 45 repeat unstable allele associated with a disease phenotype at the MJD1/SCA3 locus.</strong> Am. J. Med. Genet. Neuropsychiat. Genet. 133B: 124-126, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15457499/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15457499</a>] [<a href="https://doi.org/10.1002/ajmg.b.30088" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15457499">Padiath et al. (2005)</a> noted that this was the smallest unstable allele reported in the ATXN3 gene. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15457499" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#56" class="mim-tip-reference" title="Leotti, V. B., de Vries, J. J., Oliveira, C. M., de Mattos, E. P., Te Meerman, G. J., Brunt, E. R., Kampinga, H. H., Jardim, L. B., Verbeek, D. S. <strong>CAG repeat size influences the progression rate of spinocerebellar ataxia type 3.</strong> Ann. Neurol. 89: 66-73, 2021.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/32978817/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">32978817</a>] [<a href="https://doi.org/10.1002/ana.25919" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="32978817">Leotti et al. (2021)</a> analyzed CAG repeat size and progression of disease for over 15 years in 82 Dutch patients with MJD from a single medical center. The analysis included a total of 722 clinical evaluations and scores on the International Cooperative Ataxia Rating Scale. The authors found that the length of the expanded CAG repeat explained 49.39% of the age of onset variation. Across the entire cohort, the ICARS scores increased by an average of 2.57 points per year, but the patients with the largest CAG expansions (70-75 repeats) had a faster progression (3.27 points per year) than those with the shortest CAG expansions (60-66 repeats) whose ICARS scores increased at an average of 1.78 points per year. <a href="#56" class="mim-tip-reference" title="Leotti, V. B., de Vries, J. J., Oliveira, C. M., de Mattos, E. P., Te Meerman, G. J., Brunt, E. R., Kampinga, H. H., Jardim, L. B., Verbeek, D. S. <strong>CAG repeat size influences the progression rate of spinocerebellar ataxia type 3.</strong> Ann. Neurol. 89: 66-73, 2021.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/32978817/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">32978817</a>] [<a href="https://doi.org/10.1002/ana.25919" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="32978817">Leotti et al. (2021)</a> calculated that the CAG repeat length explained 30% of the variation in disease progression. The CAG repeat length combined with the residual age of onset (RAO, the difference between the observed age of onset and predicted age of onset based on the expanded CAG repeat length) explained 46.9% of the ICARS progression. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=32978817" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Allelic Transmission</em></strong></p><p>
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<a href="#64" class="mim-tip-reference" title="Maruyama, H., Nakamura, S., Matsuyama, Z., Sakai, T., Doyu, M., Sobue, G., Seto, M., Tsujihata, M., Oh-i, T., Nishio, T., Sunohara, N., Takahashi, R., and 11 others. <strong>Molecular features of the CAG repeats and clinical manifestation of Machado-Joseph disease.</strong> Hum. Molec. Genet. 4: 807-812, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7633439/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7633439</a>] [<a href="https://doi.org/10.1093/hmg/4.5.807" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7633439">Maruyama et al. (1995)</a> analyzed parent-child transmission in association with the clinical anticipation of the disease and showed the unidirectional expansion of CAG repeats with no case of diminution in the affected family. The differences in CAG repeat length between parent and child and between sibs were greater in paternal transmission than in maternal transmission. Detailed analysis showed that a large degree of expansion was associated with a shorter length of the ATXN3 gene in paternal transmission. On the other hand, the increments of increase were similar for shorter and longer expansions in maternal transmission. Among the 3 clinical subtypes, type 1 MJD with dystonia showed a larger degree of expansion in CAG repeats of the gene and younger ages of onset than the other types. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7633439" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#43" class="mim-tip-reference" title="Ikeuchi, T., Igarashi, S., Takiyama, Y., Onodera, O., Oyake, M., Takano, H., Koide, R., Tanaka, H., Tsuji, S. <strong>Non-mendelian transmission in dentatorubral-pallidoluysian atrophy and Machado-Joseph disease: the mutant allele is preferentially transmitted in male meiosis.</strong> Am. J. Hum. Genet. 58: 730-733, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8644735/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8644735</a>]" pmid="8644735">Ikeuchi et al. (1996)</a> analyzed segregation patterns in 80 transmissions in 7 MJD pedigrees and in 211 transmissions in 24 DRPLA pedigrees with the diagnoses confirmed by molecular testing. The significant distortions in favor of transmission of the mutant alleles were found in male meiosis, where the mutant alleles were transmitted to 73% of all offspring in MJD (P less than 0.01) and to 62% of all offspring in DRPLA (P less than 0.01). The results were consistent with meiotic drive in these 2 disorders. The authors commented that, since more prominent meiotic instability of the length of the CAG trinucleotide repeats is observed in male meiosis than in female meiosis and meiotic drive is observed only in male meiosis, these results raised the possibility that a common molecular mechanism underlies the meiotic drive and the meiotic instability in male meiosis. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8644735" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#83" class="mim-tip-reference" title="Rubinsztein, D. C., Leggo, J. <strong>Non-Mendelian transmission at the Machado-Joseph disease locus in normal females: preferential transmission of alleles with smaller CAG repeats.</strong> J. Med. Genet. 34: 234-236, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9132496/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9132496</a>] [<a href="https://doi.org/10.1136/jmg.34.3.234" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9132496">Rubinsztein and Leggo (1997)</a> investigated the transmission of alleles with larger versus smaller CAG repeat numbers in the ATXN3 gene in normal heterozygotes from the 40 CEPH families. Their data suggested that there was no segregation distortion in male meioses, while the smaller CAG allele was inherited in 57% of female meioses (p less than 0.016). The pattern of inheritance of smaller versus larger CAG alleles at this locus was significantly different when male and female meioses were compared. While previous data suggested that meiotic drive may be a feature of certain human diseases, including the trinucleotide disease MJD, myotonic dystrophy, and DRPLA, the data of <a href="#83" class="mim-tip-reference" title="Rubinsztein, D. C., Leggo, J. <strong>Non-Mendelian transmission at the Machado-Joseph disease locus in normal females: preferential transmission of alleles with smaller CAG repeats.</strong> J. Med. Genet. 34: 234-236, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9132496/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9132496</a>] [<a href="https://doi.org/10.1136/jmg.34.3.234" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9132496">Rubinsztein and Leggo (1997)</a> were compatible with meiotic drive also occurring among non-disease-associated CAG sizes. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9132496" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In German patients with SCA3, <a href="#75" class="mim-tip-reference" title="Riess, O., Epplen, J. T., Amoiridis, G., Przuntek, H., Schols, L. <strong>Transmission distortion of the mutant alleles in spinocerebellar ataxia.</strong> Hum. Genet. 99: 282-284, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9048937/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9048937</a>] [<a href="https://doi.org/10.1007/s004390050355" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9048937">Riess et al. (1997)</a> likewise found transmission distortion of the mutant alleles, but the segregation distortion was observed during maternal transmission in German families, rather than in paternal inheritance, as observed in Japanese pedigrees. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9048937" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#34" class="mim-tip-reference" title="Grewal, R. P., Cancel, G., Leeflang, E. P., Durr, A., McPeek, M. S., Draghinas, D., Yao, X., Stevanin, G., Alnot, M.-O., Brice, A., Arnheim, N. <strong>French Machado-Joseph disease patients do not exhibit gametic segregation distortion: a sperm typing analysis.</strong> Hum. Molec. Genet. 8: 1779-1784, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10441343/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10441343</a>] [<a href="https://doi.org/10.1093/hmg/8.9.1779" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10441343">Grewal et al. (1999)</a> performed a sperm typing study of 5 MJD patients of French descent. Analysis of the pooled data showed a ratio of mutant to normal alleles of 379:436 (46.5%:53.5%). To confirm these results, sperm typing analysis was also performed using a polymorphic marker, D14S1050, closely linked to the ATXN3 gene. Among 910 sperm analyzed, the allele linked to the disease chromosome was detected in 50.3% of the samples, and the allele linked to the normal chromosome was found in 49.6% of the sperm. The difference in frequency of these 2 alleles was not significant. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10441343" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In an analysis of 428 meioses among 102 healthy Portuguese sibships, <a href="#6" class="mim-tip-reference" title="Bettencourt, C., Fialho, R. N., Santos, C., Montiel, R., Bruges-Armas, J., Maciel, P., Lima, M. <strong>Segregation distortion of wild-type alleles at the Machado-Joseph disease locus: a study in normal families from the Azores islands (Portugal).</strong> J. Hum. Genet. 53: 333-339, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18286225/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18286225</a>] [<a href="https://doi.org/10.1007/s10038-008-0261-7" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18286225">Bettencourt et al. (2008)</a> observed preferential transmission of the smaller ATXN3 wildtype allele. There were no mutational events. There was a positive correlation between the difference in length between the 2 ATXN3 alleles of the transmitter's genotype and the frequency of transmission of the smaller alleles. The authors concluded that the genotypic composition of the transmitters in a sample should be taken into account in studies of segregation ratio distortion. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=18286225" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In a large population-based study of 82 MJD families from Rio Grande do Sul, Brazil, <a href="#71" class="mim-tip-reference" title="Prestes, P. R., Saraiva-Pereira, M. L., Silveira, I., Sequeiros, J., Jardim, L. B. <strong>Machado-Joseph disease enhances genetic fitness: a comparison between affected and unaffected women and between MJD and the general population.</strong> Ann. Hum. Genet. 72: 57-64, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17683516/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17683516</a>] [<a href="https://doi.org/10.1111/j.1469-1809.2007.00388.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="17683516">Prestes et al. (2008)</a> found that fitness among affected individuals was increased compared to the general population and compared to unaffected family members. Affected individuals had significantly more children than unaffected relatives, with no sign of parental gender effect. In addition, affected individuals had a lower age at first delivery and earlier onset of menopause compared to unaffected relatives; however, affected women who did not have children had larger CAG tracts than those who had children. <a href="#71" class="mim-tip-reference" title="Prestes, P. R., Saraiva-Pereira, M. L., Silveira, I., Sequeiros, J., Jardim, L. B. <strong>Machado-Joseph disease enhances genetic fitness: a comparison between affected and unaffected women and between MJD and the general population.</strong> Ann. Hum. Genet. 72: 57-64, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17683516/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17683516</a>] [<a href="https://doi.org/10.1111/j.1469-1809.2007.00388.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="17683516">Prestes et al. (2008)</a> noted that since disease onset usually occurs after reproductive age, most affected individuals have children before knowing their genetic status. The findings overall suggested enhanced fitness of the mutant allele. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17683516" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#42" class="mim-tip-reference" title="Ikeda, H., Yamaguchi, M., Sugai, S., Aze, Y., Narumiya, S., Kakizuka, A. <strong>Expanded polyglutamine in the Machado-Joseph disease protein induces cell death in vitro and in vivo.</strong> Nature Genet. 13: 196-202, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8640226/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8640226</a>] [<a href="https://doi.org/10.1038/ng0696-196" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8640226">Ikeda et al. (1996)</a> demonstrated the induction of apoptosis in cultured cells expressing a portion of the ATXN3 gene that included the expanded CAG repeats. Cell death occurred only when the CAG repeat was translated into polyglutamine residues, which apparently precipitated in large covalently modified forms. <a href="#98" class="mim-tip-reference" title="Sisodia, S. S. <strong>Nuclear inclusions in glutamine repeat disorders: are they pernicious, coincidental, or beneficial?</strong> Cell 95: 1-4, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9778239/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9778239</a>] [<a href="https://doi.org/10.1016/s0092-8674(00)81743-2" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9778239">Sisodia (1998)</a> reviewed the significance of nuclear inclusions in glutamine repeat disorders. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=9778239+8640226" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Studying the link between intranuclear expression of expanded polyglutamine and neuronal dysfunction, <a href="#69" class="mim-tip-reference" title="Perez, M. K., Paulson, H. L., Pittman, R. N. <strong>Ataxin-3 with an altered conformation that exposes the polyglutamine domain is associated with the nuclear matrix.</strong> Hum. Molec. Genet. 8: 2377-2385, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10556285/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10556285</a>] [<a href="https://doi.org/10.1093/hmg/8.13.2377" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10556285">Perez et al. (1999)</a> demonstrated that ataxin-3 adopts a unique conformation when expressed within the nucleus of transfected cells. They found that this novel conformation of intranuclear ataxin-3 is not due to proteolysis, suggesting instead that association with nuclear protein(s) alters the structure of full-length ataxin-3, exposing the polyglutamine domain. This conformationally altered ataxin-3 was bound to the nuclear matrix. The pathologic form of ataxin-3 with an expanded polyglutamine domain also associates with the nuclear matrix. These data suggested that an early event in the pathogenesis of SCA3/MJD may be an altered conformation of ataxin-3 within the nucleus that exposes the polyglutamine domain. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10556285" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#15" class="mim-tip-reference" title="Chai, Y., Koppenhafer, S. L., Shoesmith, S. J., Perez, M. K., Paulson, H. L. <strong>Evidence for proteasome involvement in polyglutamine disease: localization to nuclear inclusions in SCA3/MJD and suppression of polyglutamine aggregation in vitro.</strong> Hum. Molec. Genet. 8: 673-682, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10072437/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10072437</a>] [<a href="https://doi.org/10.1093/hmg/8.4.673" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10072437">Chai et al. (1999)</a> presented 2 lines of evidence implicating the ubiquitin-proteasome pathway in the pathogenesis of SCA3/MJD. First, studies of both human disease tissue and in vitro models showed redistribution of the 26S proteasome complex into polyglutamine aggregates. In neurons from SCA3/MJD brain, the proteasome localized to intranuclear inclusions containing the mutant protein ataxin-3. In transfected cells, the proteasome redistributed into inclusions formed by 3 expanded polyglutamine proteins: a pathologic ataxin-3 fragment, full-length mutant ataxin-3, and an unrelated GFP-polyglutamine fusion protein. Inclusion formation by the full-length mutant ataxin-3 required nuclear localization of the protein and occurred within specific subnuclear structures recently implicated in the regulation of cell death. In a second set of experiments, inhibitors of the proteasome caused a repeat length-dependent increase in aggregate formation, implying that the proteasome plays a direct role in suppressing polyglutamine aggregation in disease. These results supported a central role for protein misfolding in the pathogenesis of SCA3/MJD and suggested that modulating proteasome activity is a potential approach to altering the progression of this and other polyglutamine diseases. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10072437" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#25" class="mim-tip-reference" title="Evert, B. O., Wullner, U., Schulz, J. B., Weller, M., Groscurth, P., Trottier, Y., Brice, A., Klockgether, T. <strong>High level expression of expanded full-length ataxin-3 in vitro causes cell death and formation of intranuclear inclusions in neuronal cells.</strong> Hum. Molec. Genet. 8: 1169-1176, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10369861/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10369861</a>] [<a href="https://doi.org/10.1093/hmg/8.7.1169" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10369861">Evert et al. (1999)</a> generated ataxin-3-expressing rat mesencephalic CSM14.1 cells to study the effects of long-term expression of ataxin-3. The isolated stable cell lines provided high level expression of human full-length ataxin-3 with either the normal nonexpanded CAG repeats (SCA3-Q23) or the pathogenic expanded CAG repeats (SCA3-Q70). When cultured at a nonpermissive temperature (39 degrees C), CSM14.1 cells expressing the expanded full-length ataxin-3 developed nuclear inclusion bodies, strong indentations of the nuclear envelope, and cytoplasmic vacuolation, whereas cells expressing the nonexpanded form and control cells did not. The ultrastructural alterations resembled those found in affected neurons of SCA3 patients. Cells with such changes exhibited increased spontaneous nonapoptotic cell death. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10369861" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#28" class="mim-tip-reference" title="Gaspar, C., Jannatipour, M., Dion, P., Laganiere, J., Sequeiros, J., Brais, B., Rouleau, G. A. <strong>CAG tract of MJD-1 may be prone to frameshifts causing polyalanine accumulation.</strong> Hum. Molec. Genet. 9: 1957-1966, 2000.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10942424/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10942424</a>] [<a href="https://doi.org/10.1093/hmg/9.13.1957" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10942424">Gaspar et al. (2000)</a> explored the possibility that frameshift mutations in expanded CAG tracts of ATXN3 can generate polyalanine mutant proteins and form intranuclear inclusions. Antisera were raised against a synthetic peptide corresponding to the C terminus of ATXN3, which would result from a frameshift within the CAG repeat motif with an intervening polyalanine stretch. Corresponding proteins were evident in MJD patients by Western blot analysis of lymphoblastoid proteins and in situ hybridization of MJD pontine neurons. Transfection experiments suggested that frameshifts are more likely to occur in longer CAG repeats and that alanine polymers alone may be harmful to cells. The authors suggested that a similar pathogenic mechanism may occur in other CAG repeat disorders. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10942424" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#44" class="mim-tip-reference" title="Ishikawa, A., Yamada, M., Makino, K., Aida, I., Idezuka, J., Ikeuchi, T., Soma, Y., Takahashi, H., Tsuji, S. <strong>Dementia and delirium in 4 patients with Machado-Joseph disease.</strong> Arch. Neurol. 59: 1804-1808, 2002.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/12433269/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">12433269</a>] [<a href="https://doi.org/10.1001/archneur.59.11.1804" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="12433269">Ishikawa et al. (2002)</a> reported 4 patients with MJD, confirmed by expanded CAG repeat in the ATXN3 gene, who had symptoms of dementia and delirium. The common features of the patients, 2 of whom were sibs, were relatively early age of onset (16-36 years), long latency to the occurrence of dementia and delirium (13-25 years), and much longer CAG repeat lengths (74-79) compared with the mean repeat length found in patients with MJD. Abnormal mental activity began after age 40 and consisted of abnormal episodes of crying, excitation, delusion, disorientation, and inappropriate behavior, suggesting a delirious state. Dementia followed soon after. Pathologic examination of 2 patients showed cerebrocortical and thalamic neuronal intranuclear inclusions that stained with an antipolyglutamine antibody. <a href="#44" class="mim-tip-reference" title="Ishikawa, A., Yamada, M., Makino, K., Aida, I., Idezuka, J., Ikeuchi, T., Soma, Y., Takahashi, H., Tsuji, S. <strong>Dementia and delirium in 4 patients with Machado-Joseph disease.</strong> Arch. Neurol. 59: 1804-1808, 2002.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/12433269/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">12433269</a>] [<a href="https://doi.org/10.1001/archneur.59.11.1804" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="12433269">Ishikawa et al. (2002)</a> suggested that symptoms of delirium and dementia may occur in late stages of MJD, particularly in those with longer expanded repeats, and may be caused by dysfunction of cerebrocortical neurons. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12433269" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#113" class="mim-tip-reference" title="Toulouse, A., Au-Yeung, F., Gaspar, C., Roussel, J., Dion, P., Rouleau, G. A. <strong>Ribosomal frameshifting on MJD-1 transcripts with long CAG tracts.</strong> Hum. Molec. Genet. 14: 2649-2660, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16087686/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16087686</a>] [<a href="https://doi.org/10.1093/hmg/ddi299" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="16087686">Toulouse et al. (2005)</a> established a cellular model of transcript frameshifting of expanded CAG tracts, resulting from ribosomal slippage to the -1 frame exclusively. Ribosomal frameshifting depended on the presence of long CAG tracts, and polyalanine-frameshifted proteins may enhance polyglutamine-associated toxicity, possibly contributing to pathogenesis. Anisomycin, a ribosome-interacting drug that reduces -1 frameshifting, also reduced toxicity, suggesting a therapeutic opportunity for these disorders. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16087686" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#37" class="mim-tip-reference" title="Haacke, A., Broadley, S. A., Boteva, R., Tzvetkov, N., Hartl, F. U., Breuer, P. <strong>Proteolytic cleavage of polyglutamine-expanded ataxin-3 is critical for aggregation and sequestration of non-expanded ataxin-3.</strong> Hum. Molec. Genet. 15: 555-568, 2006.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16407371/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16407371</a>] [<a href="https://doi.org/10.1093/hmg/ddi472" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="16407371">Haacke et al. (2006)</a> found that full-length recombinant human AT3 formed detergent-resistant fibrillar aggregates in vitro with extremely low efficiency, even when it contained a pathogenic polyQ tract of 71 residues (AT3Q71). However, an N-terminally truncated form, called 257cQ71, which began with residue 257 and contained only the C terminus with an expanded polyQ region, readily formed detergent-insoluble aggregates and recruited full-length nonpathogenic AT3Q22 into the aggregates. The efficiency of recruitment increased with expansion of the polyQ stretch. FRET analysis revealed that the interaction of AT3Q22 with the polyQ tract of 257cQ71 caused a conformational change that affected the active-site cysteine within the Josephin domain of AT3Q22. Similar results were found in vivo with transfected mouse neuroblastoma cells: 257cQ71 formed inclusions in almost all cells, and full-length AT3 proteins did not readily aggregate unless coexpressed with 257cQ71. AT3Q71 also formed inclusions, but it appeared to do so following its partial degradation. Use of an engineered protease-sensitive form of AT3 suggested that release of expanded polyQ fragments initiates the formation of cellular inclusions. <a href="#37" class="mim-tip-reference" title="Haacke, A., Broadley, S. A., Boteva, R., Tzvetkov, N., Hartl, F. U., Breuer, P. <strong>Proteolytic cleavage of polyglutamine-expanded ataxin-3 is critical for aggregation and sequestration of non-expanded ataxin-3.</strong> Hum. Molec. Genet. 15: 555-568, 2006.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16407371/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16407371</a>] [<a href="https://doi.org/10.1093/hmg/ddi472" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="16407371">Haacke et al. (2006)</a> concluded that recruitment of functional AT3 into aggregates by expanded polyQ-containing fragments reduces cellular AT3 content and thus impairs its function. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16407371" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#74" class="mim-tip-reference" title="Reina, C. P., Zhong, X., Pittman, R. N. <strong>Proteotoxic stress increases nuclear localization of ataxin-3.</strong> Hum. Molec. Genet. 19: 235-249, 2010.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19843543/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19843543</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=19843543[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1093/hmg/ddp482" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="19843543">Reina et al. (2010)</a> showed that interactions of ATXN3 with valosin-containing protein (VCP; <a href="/entry/601023">601023</a>) and HHR23B (RAD23B; <a href="/entry/600062">600062</a>) were dynamic and modulated by proteotoxic stresses. Heat shock, a general proteotoxic stress, also induced wildtype and pathogenic ATXN3 to accumulate in the nucleus. Mapping studies showed that 2 regions of ATXN3, the Josephin domain and the C terminus, regulated heat shock-induced nuclear localization. Atxn3-null mouse cells were more sensitive to toxic effects of heat shock, suggesting that ATXN3 had a protective function in the cellular response to heat shock. Oxidative stress also induced nuclear localization of ATXN3; both wildtype and pathogenic ATXN3 accumulated in the nucleus of SCA3 patient fibroblasts following oxidative stress. Heat shock and oxidative stress were the first processes identified that increased nuclear localization of ATXN3. <a href="#74" class="mim-tip-reference" title="Reina, C. P., Zhong, X., Pittman, R. N. <strong>Proteotoxic stress increases nuclear localization of ataxin-3.</strong> Hum. Molec. Genet. 19: 235-249, 2010.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19843543/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19843543</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=19843543[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1093/hmg/ddp482" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="19843543">Reina et al. (2010)</a> suggested that the nucleus may be a key site for early pathogenesis of SCA3. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=19843543" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#53" class="mim-tip-reference" title="Koch, P., Breuer, P., Peitz, M., Jungverdorben, J., Kesavan, J., Poppe, D., Doerr, J., Ladewig, J., Mertens, J., Tuting, T., Hoffmann, P., Klockgether, T., Evert, B. O., Wullner, U., Brustle, O. <strong>Excitation-induced ataxin-3 aggregation in neurons from patients with Machado-Joseph disease.</strong> Nature 480: 543-546, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22113611/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22113611</a>] [<a href="https://doi.org/10.1038/nature10671" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="22113611">Koch et al. (2011)</a> showed that L-glutamate-induced excitation of patient-specific induced pluripotent stem cell (iPSC)-derived neurons initiates calcium-dependent proteolysis of ATXN3 followed by the formation of SDS-insoluble aggregates. This phenotype could be abolished by calpain (see <a href="/entry/114220">114220</a>) inhibition, confirming a key role of this protease in ATXN3 aggregation. Aggregate formation was further dependent on functional sodium and potassium channels as well as ionotropic and voltage-gated calcium channels, and was not observed in iPSCs, fibroblasts, or glia, thereby providing an explanation for the neuron-specific phenotype of Machado-Joseph disease. <a href="#53" class="mim-tip-reference" title="Koch, P., Breuer, P., Peitz, M., Jungverdorben, J., Kesavan, J., Poppe, D., Doerr, J., Ladewig, J., Mertens, J., Tuting, T., Hoffmann, P., Klockgether, T., Evert, B. O., Wullner, U., Brustle, O. <strong>Excitation-induced ataxin-3 aggregation in neurons from patients with Machado-Joseph disease.</strong> Nature 480: 543-546, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22113611/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22113611</a>] [<a href="https://doi.org/10.1038/nature10671" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="22113611">Koch et al. (2011)</a> concluded that iPSCs enable the study of aberrant protein processing associated with late-onset neurodegenerative disorders in patient-specific neurons. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=22113611" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>With the cloning of the ATXN3 gene and the firm identification of the disorder in many populations, the hypothesis was raised that the present world distribution of the disorder could have resulted from the spread of an original founder mutation. <a href="#100" class="mim-tip-reference" title="Stevanin, G., Cancel, G., Didierjean, O., Durr, A., Abbas, N., Cassa, E., Feingold, J., Agid, Y., Brice, A. <strong>Linkage disequilibrium at the Machado-Joseph disease/spinal cerebellar ataxia 3 locus: evidence for a common founder effect in French and Portuguese-Brazilian families as well as a second ancestral Portuguese-Azorean mutation. (Letter)</strong> Am. J. Hum. Genet. 57: 1247-1250, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7485178/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7485178</a>]" pmid="7485178">Stevanin et al. (1995)</a> reported strong linkage disequilibrium of MJD chromosomes at the AFM343vf1 locus and found a common haplotype that is frequently shared by Japanese and Azorean MJD chromosomes, which suggests a founder effect or the presence of predisposing chromosomes prone to expansions of the CAG repeat. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7485178" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#58" class="mim-tip-reference" title="Lima, M., Mayer, F. M., Coutinho, P., Abade, A. <strong>Origins of a mutation: population genetics of Machado-Joseph disease in the Azores (Portugal).</strong> Hum. Biol. 70: 1011-1023, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9825593/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9825593</a>]" pmid="9825593">Lima et al. (1998)</a> studied the genealogies of 32 Azorean families containing a total of 103 patients with Machado-Joseph disease, using parish records as the main source of data. These patients were originally from the islands of Sao Miguel, Terceira, Graciosa, and Flores. The genealogies of the 2 main Azorean American families, by the names of Machado and Joseph, were also reconstructed. The family from Terceira was linked to 3 different MJD families from Flores through common ancestors. No kinship was observed, however, between the MJD families from Sao Miguel and families from any other island. The chronologic and geographic distribution indicated that more than one MJD mutation was introduced in the Azores, probably by settlers coming from the Portuguese mainland. The molecular evidence corroborated these results, because 2 distinct haplotypes had been established, one on the island of Sao Miguel and the other on Flores. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9825593" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Among 202 Japanese and 177 Caucasian families with autosomal dominant SCA, <a href="#106" class="mim-tip-reference" title="Takano, H., Cancel, G., Ikeuchi, T., Lorenzetti, D., Mawad, R., Stevanin, G., Didierjean, O., Durr, A., Oyake, M., Shimohata, T., Sasaki, R., Koide, R., Igarashi, S., Hayashi, S., Takiyama, Y., Nishizawa, M., Tanaka, H., Zoghbi, H., Brice, A., Tsuji, S. <strong>Close associations between prevalences of dominantly inherited spinocerebellar ataxias with CAG-repeat expansions and frequencies of large normal CAG alleles in Japanese and Caucasian populations.</strong> Am. J. Hum. Genet. 63: 1060-1066, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9758625/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9758625</a>] [<a href="https://doi.org/10.1086/302067" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9758625">Takano et al. (1998)</a> found that the prevalence of SCA3 was significantly higher in the Japanese population (43%) compared to the Caucasian population (30%). This corresponded to higher frequencies of large normal ATXN3 CAG repeat alleles (greater than 27 repeats) in Japanese controls compared to Caucasian controls. The findings suggested that large normal alleles contribute to the generation of expanded alleles that lead to dominant SCA. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9758625" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#29" class="mim-tip-reference" title="Gaspar, C., Lopes-Cendes, I., Hayes, S., Goto, J., Arvidsson, K., Dias, A., Silveira, I., Maciel, P., Coutinho, P., Lima, M., Zhou, Y.-X., Soong, B.-W., and 18 others. <strong>Ancestral origins of the Machado-Joseph disease mutation: a worldwide haplotype study.</strong> Am. J. Hum. Genet. 68: 523-528, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11133357/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11133357</a>] [<a href="https://doi.org/10.1086/318184" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11133357">Gaspar et al. (2001)</a> analyzed linkage-disequilibrium of tightly linked polymorphisms and by haplotype comparison in 249 families from different countries. They typed 5 microsatellite markers surrounding the MJD locus and 3 intragenic single-basepair polymorphisms. The results showed 2 different haplotypes, specific to the island of origin, in families of Azorean extraction. In families from mainland Portugal, both Azorean haplotypes could be found. The majority of non-Portuguese families also shared the same intragenic ACA haplotype seen in the families coming from the island of Flores, but at least 3 other haplotypes were seen. These findings suggested 2 introductions of the mutation into the Portuguese population. Worldwide, the sharing of the intragenic ACA haplotype by most families studied supports a founder mutation in MJD. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11133357" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#65" class="mim-tip-reference" title="Mittal, U., Srivastava, A. K., Jain, S., Jain, S, Mukerji, M. <strong>Founder haplotype for Machado-Joseph disease in the Indian population.</strong> Arch. Neurol. 62: 637-640, 2005. Note: Erratum: Arch. Neurol. 62: 1143 only, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15824265/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15824265</a>] [<a href="https://doi.org/10.1001/archneur.62.4.637" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15824265">Mittal et al. (2005)</a> identified the common ACA haplotype in 9 Indian families with MJD. This haplotype was also significantly associated with large normal alleles (greater than 26 repeats) in unaffected Indian individuals. The authors suggested that the pathogenic expanded alleles may have originated from the pool of large normal alleles in this population, possibly via a gene conversion event. The findings were consistent with historical evidence related to Moorish sea trade and to maritime links between Portugal and South Asia. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15824265" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In a nationwide survey of Japanese patients, <a href="#40" class="mim-tip-reference" title="Hirayama, K., Takayanagi, T., Nakamura, R., Yanagisawa, N., Hattori, T., Kita, K., Yanagimoto, S., Fujita, M., Nagaoka, M., Satomura, Y., Sobue, I., Iizuka, R., Toyokura, Y., Satoyoshi, E. <strong>Spinocerebellar degenerations in Japan: a nationwide epidemiological and clinical study.</strong> Acta Neurol. Scand. Suppl. 153: 1-22, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8059595/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8059595</a>] [<a href="https://doi.org/10.1111/j.1600-0404.1994.tb05401.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8059595">Hirayama et al. (1994)</a> estimated the prevalence of all forms of spinocerebellar degeneration to be 4.53 per 100,000; of these, 2% were thought to have Machado-Joseph disease. <a href="#124" class="mim-tip-reference" title="Watanabe, H., Tanaka, F., Matsumoto, M., Doyu, M., Ando, T., Mitsuma, T., Sobue, G. <strong>Frequency analysis of autosomal dominant cerebellar ataxias in Japanese patients and clinical characterization of spinocerebellar ataxia type 6.</strong> Clin. Genet. 53: 13-19, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9550356/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9550356</a>] [<a href="https://doi.org/10.1034/j.1399-0004.1998.531530104.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9550356">Watanabe et al. (1998)</a> investigated 101 kindreds with spinocerebellar ataxias from the central Honshu island of Japan, using a molecular diagnostic approach with amplification of the CAG trinucleotide repeat of the causative genes. Machado-Joseph disease was the most common form, accounting for 33.7% of cases. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=9550356+8059595" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#103" class="mim-tip-reference" title="Storey, E., du Sart, D., Shaw, J. H., Lorentzos, P., Kelly, L., Gardner, R. J. M., Forrest, S. M., Biros, I., Nicholson, G. A. <strong>Frequency of spinocerebellar ataxia types 1, 2, 3, 6, and 7 in Australian patients with spinocerebellar ataxia.</strong> Am. J. Med. Genet. 95: 351-357, 2000.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11186889/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11186889</a>] [<a href="https://doi.org/10.1002/1096-8628(20001211)95:4<351::aid-ajmg10>3.0.co;2-r" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11186889">Storey et al. (2000)</a> examined the frequency of mutations for SCA types 1, 2, 3, 6, and 7 (<a href="/entry/164500">164500</a>) in southeastern Australia. Of 63 pedigrees or individuals with positive tests, 30% had SCA1, 15% had SCA2, 22% had SCA3, 30% had SCA6, and 3% had SCA7. Ethnic origin was of importance in determining SCA type: 4 of 9 SCA2 index cases were of Italian origin, and 4 of 14 SCA3 index cases were of Chinese origin. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11186889" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In 110 unrelated Portuguese and Brazilian families with spinocerebellar ataxia due to a trinucleotide repeat expansion, <a href="#97" class="mim-tip-reference" title="Silveira, I., Miranda, C., Guimaraes, L., Moreira, M.-C., Alonso, I., Mendonca, P., Ferro, A., Pinto-Basto, J., Coelho, J., Ferreirinha, F., Poirier, J., Parreira, E., and 12 others. <strong>Trinucleotide repeats in 202 families with ataxia: a small expanded (CAG)n allele at the SCA17 locus.</strong> Arch. Neurol. 59: 623-629, 2002.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11939898/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11939898</a>] [<a href="https://doi.org/10.1001/archneur.59.4.623" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11939898">Silveira et al. (2002)</a> found that 63% of dominantly inherited cases had an expansion in the ATXN3 gene. Other tested loci included SCA2 (3%), DRPLA (2%), SCA6 (1%), SCA7 (1%), and SCA8 (2%). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11939898" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#121" class="mim-tip-reference" title="van de Warrenburg, B. P. C., Sinke, R. J., Verschuuren-Bemelmans, C. C., Scheffer, H., Brunt, E. R., Ippel, P. F., Maat-Kievit, J. A., Dooijes, D., Notermans, N. C., Lindhout, D., Knoers, N. V. A. M., Kremer, H. P. H. <strong>Spinocerebellar ataxias in the Netherlands: prevalence and age at onset variance analysis.</strong> Neurology 58: 702-708, 2002.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11889231/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11889231</a>] [<a href="https://doi.org/10.1212/wnl.58.5.702" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11889231">Van de Warrenburg et al. (2002)</a> surveyed information from Dutch diagnostic laboratories and determined that the minimal prevalence of ADCA in the Netherlands was 3 per 100,000 (range, 2.8-3.8/100,000). Of 145 ADCA families, 44.1% had SCA3, 23.5% had SCA6, 11.7% had SCA7, 11.0% had SCA2, and 9.7% had SCA1. CAG repeat length contributed to 52 to 76% of age of onset variance, with similar regression slopes for SCA1, SCA2, SCA3, and SCA7, which the authors suggested may reflect a similar mechanism of polyglutamine-induced neurotoxicity in these diseases. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11889231" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>By haplotype analysis of 21 Dutch SCA3 families confirmed by genotype, <a href="#122" class="mim-tip-reference" title="Verbeek, D. S., Piersma, S. J., Hennekam, E. F. A. M., Ippel, E. F., Pearson, P. L., Sinke, R. J. <strong>Haplotype study in Dutch SCA3 and SCA6 families: evidence for common founder mutations.</strong> Europ. J. Hum. Genet. 12: 441-446, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15026782/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15026782</a>] [<a href="https://doi.org/10.1038/sj.ejhg.5201167" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15026782">Verbeek et al. (2004)</a> observed a highly conserved 1.4-Mb core genomic region between markers D14S995 and D14S973 in 17 families. The 4 remaining families had a truncated form of this haplotype. Genealogic research was able to link 10 SCA3 families into 4 clusters. Families with a 6 allele at marker D14S617 were clustered in the eastern part of the Netherlands (province of Drenthe) and those with a 7 allele at marker D14S617 were clustered in the western part (province of South Holland). The findings implicated 1 major founder SCA3 mutation in the Dutch population. Similar results were found for SCA6. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15026782" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#128" class="mim-tip-reference" title="Zhao, Y., Tan, E. K., Law, H. Y., Yoon, C. S., Wong, M. C., Ng, I. <strong>Prevalence and ethnic differences of autosomal-dominant cerebellar ataxia in Singapore.</strong> Clin. Genet. 62: 478-481, 2002.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/12485197/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">12485197</a>] [<a href="https://doi.org/10.1034/j.1399-0004.2002.620610.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="12485197">Zhao et al. (2002)</a> reported the prevalence and ethnic differences of ADCA in Singapore. Among 204 patients with ataxia who underwent genetic testing for 9 types, 58 (28.4%) from 36 families tested positive. SCA3 was identified in 31 (53.4%) patients from 15 families, SCA2 in 17 (29.3%) patients from 12 families, and SCA1 in 4 (6.9%) patients from 4 families. SCA2 was the only subtype identified among ethnic Malay and ethnic Indian families. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12485197" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Of 253 unrelated Korean patients with progressive cerebellar ataxia, <a href="#55" class="mim-tip-reference" title="Lee, W. Y., Jin, D. K., Oh, M. R., Lee, J. E., Song, S. M., Lee, E. A., Kim, G., Chung, J. S., Lee, K. H. <strong>Frequency analysis and clinical characterization of spinocerebellar ataxia types 1, 2, 3, 6, and 7 in Korean patients.</strong> Arch. Neurol. 60: 858-863, 2003. Note: Erratum: Arch. Neurol. 60: 1256 only, 2003.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/12810491/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">12810491</a>] [<a href="https://doi.org/10.1001/archneur.60.6.858" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="12810491">Lee et al. (2003)</a> identified 52 (20.6%) with expanded CAG repeats. The most frequent SCA type was SCA2 (33%), followed by SCA3 (29%), SCA6 (19%), SCA1 (12%), and SCA7 (8%). There were characteristic clinical features, such as hypotonia and optic atrophy for SCA1, hyporeflexia for SCA2, nystagmus, bulging eye, and dystonia for SCA3, and macular degeneration for SCA7. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12810491" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#95" class="mim-tip-reference" title="Shimizu, Y., Yoshida, K., Okano, T., Ohara, S., Hashimoto, T., Fukushima, Y., Ikeda, S. <strong>Regional features of autosomal-dominant cerebellar ataxia in Nagano: clinical and molecular genetic analysis of 86 families.</strong> J. Hum. Genet. 49: 610-616, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15480876/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15480876</a>] [<a href="https://doi.org/10.1007/s10038-004-0196-6" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15480876">Shimizu et al. (2004)</a> estimated the prevalence of SCA in the Nagano prefecture of Japan to be at least 22 per 100,000. Thirty-one of 86 families (36%) were positive for SCA disease-causing repeat expansions: SCA6 was the most common form (19%), followed by DRPLA (10%), SCA3 (3%), SCA1 (2%), and SCA2 (1%). The authors noted that the prevalence of SCA3 was lower compared to other regions in Japan, and that the number of genetically undetermined SCA families in Nagano was much higher than in other regions. Nagano is the central district of the main island of Japan, located in a mountainous area surrounded by the Japanese Alps. The restricted geography suggested that founder effects may have contributed to the high frequency of genetically undetermined ADCA families. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15480876" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Among 114 Brazilian families with autosomal dominant SCA, <a href="#114" class="mim-tip-reference" title="Trott, A., Jardim, L. B., Ludwig, H. T., Saute, J. A. M., Artigalas, O., Kieling, C., Wanderley, H. Y. C., Rieder, C. R. M., Monte, T. L., Socal, M., Alonso, I., Ferro, A., Carvalho, T., do Ceu Moreira, M., Mendonca, P., Ferreirinha, F., Silveira, I., Sequeiros, J., Giugliani, R., Saraiva-Pereira, M. L. <strong>Spinocerebellar ataxias in 114 Brazilian families: clinical and molecular findings. (Letter)</strong> Clin. Genet. 70: 173-176, 2006.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16879203/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16879203</a>] [<a href="https://doi.org/10.1111/j.1399-0004.2006.00656.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="16879203">Trott et al. (2006)</a> found that SCA3 was the most common form, present in 94 (84%) families. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16879203" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Among 113 Japanese families from the island of Hokkaido with autosomal dominant SCA, <a href="#5" class="mim-tip-reference" title="Basri, R., Yabe, I., Soma, H., Sasaki, H. <strong>Spectrum and prevalence of autosomal dominant spinocerebellar ataxia in Hokkaido, the northern island of Japan: a study of 113 Japanese families.</strong> J. Hum. Genet. 52: 848-855, 2007.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17805477/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17805477</a>] [<a href="https://doi.org/10.1007/s10038-007-0182-x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="17805477">Basri et al. (2007)</a> found that SCA6 was the most common form of the disorder, identified in 35 (31%) families. Thirty (27%) families had SCA3, 11 (10%) had SCA1, 5 (4%) had SCA2, 5 (4%) had DRPLA, 10 (9%) had 16q22-linked SCA (<a href="/entry/117210">117210</a>), and 1 (1%) had SCA14 (<a href="/entry/605361">605361</a>). The specific disorder could not be identified in 16 (14%) families. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17805477" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#71" class="mim-tip-reference" title="Prestes, P. R., Saraiva-Pereira, M. L., Silveira, I., Sequeiros, J., Jardim, L. B. <strong>Machado-Joseph disease enhances genetic fitness: a comparison between affected and unaffected women and between MJD and the general population.</strong> Ann. Hum. Genet. 72: 57-64, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17683516/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17683516</a>] [<a href="https://doi.org/10.1111/j.1469-1809.2007.00388.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="17683516">Prestes et al. (2008)</a> found a prevalence of 3.5 per 100,000 individuals for MJD in the state of Rio Grande do Sul, Brazil. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17683516" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#105" class="mim-tip-reference" title="Sura, T., Eu-ahsunthornwattana, J, Youngcharoen, S., Busabaratana, M., Dejsuphong, D., Trachoo, O., Theerasasawat, S., Tunteeratum, A., Noparutchanodom, C., Tunlayadechanont, S. <strong>Frequencies of spinocerebellar ataxia subtypes in Thailand: window to the population history?</strong> J. Hum. Genet. 54: 284-288, 2009.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19329990/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19329990</a>] [<a href="https://doi.org/10.1038/jhg.2009.27" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="19329990">Sura et al. (2009)</a> reported that SCA3 was the most common type of SCA in Thailand, occurring in 35 (19.2%) of 182 probands and 74 (22%) of 340 total patients. SCA1 and SCA2 were found in 11.5% and 10.4% of probands, respectively. SCA3 frequency was less than that found in Chinese studies, but more than that of most Indian studies. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=19329990" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>Pierre <a href="#63" class="mim-tip-reference" title="Marie, P. <strong>Sur l'heredo-ataxie cerebelleuse.</strong> Sem. Med. 13: 444-447, 1893."None>Marie (1893)</a>, professor and head of the Department of Neurology at Paris Medical School, proposed the designation 'l'heredo-ataxie cerebelleuse' (HAC) to describe a hereditary cerebellar disorder diagnosed in the Haudebourg family reported by <a href="#52" class="mim-tip-reference" title="Klippel, M., Durante, G. <strong>Contribution a l'etude des affections nerveuses familiales et hereditaires.</strong> Rev. Med. 12: 745-786, 1892."None>Klippel and Durante (1892)</a>. The last patient from the Haudebourg family was reported by <a href="#35" class="mim-tip-reference" title="Guillain, G., Bertrand, I., Godet-Guillain, J. <strong>Etude anatomique d'un cas d'heredo-ataxie cerebelleuse.</strong> Rev. Neurol. 73: 609-611, 1941."None>Guillain et al. (1941)</a>. In a reappraisal based on original handwritten reports and pathology slides of the last case labeled with the diagnosis of HAC, whose autopsy was recorded on October 15, 1943, and whose clinicopathologic features were identical to those of patients from the Haudebourg family, <a href="#117" class="mim-tip-reference" title="Uchihara, T., Duyckaerts, C., Iwabuchi, K., Iwata, M., Yagishita, S., Hauw, J.-J. <strong>Was the ataxia of Pierre Marie Machado-Joseph disease? A reappraisal based on the last autopsy case from la Salpetriere hospital.</strong> Arch. Neurol. 61: 784-790, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15148161/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15148161</a>] [<a href="https://doi.org/10.1001/archneur.61.5.784" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15148161">Uchihara et al. (2004)</a> concluded that HAC is consistent with Machado-Joseph disease. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15148161" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#42" class="mim-tip-reference" title="Ikeda, H., Yamaguchi, M., Sugai, S., Aze, Y., Narumiya, S., Kakizuka, A. <strong>Expanded polyglutamine in the Machado-Joseph disease protein induces cell death in vitro and in vivo.</strong> Nature Genet. 13: 196-202, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8640226/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8640226</a>] [<a href="https://doi.org/10.1038/ng0696-196" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8640226">Ikeda et al. (1996)</a> created ataxic transgenic mice by expressing the expanded polyglutamine stretch in Purkinje cells. The results demonstrated the potential involvement of expanded polyglutamine regions as the common etiologic agent for inherited neurodegenerative diseases with CAG expansions. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8640226" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#123" class="mim-tip-reference" title="Warrick, J. M., Paulson, H. L., Gray-Board, G. L., Bui, Q. T., Fischbeck, K. H., Pittman, R. N., Bonini, N. M. <strong>Expanded polyglutamine protein forms nuclear inclusions and causes neural degeneration in Drosophila.</strong> Cell 93: 939-949, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9635424/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9635424</a>] [<a href="https://doi.org/10.1016/s0092-8674(00)81200-3" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9635424">Warrick et al. (1998)</a> recreated this glutamine-repeat disease in Drosophila using a segment of the SCA3/MJD protein. Targeted expression of the protein with an expanded polyglutamine repeat led to nuclear inclusion formation and late-onset cell degeneration. Differential sensitivity to the mutant transgene was observed among different cell types, with neurons being particularly susceptible. Nuclear inclusion formation alone was not sufficient for degeneration. These results demonstrated that cellular mechanisms of human glutamine-repeat disease are conserved in invertebrates. This fly model is useful in identifying additional factors that modulate neurodegeneration. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9635424" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Data indicate that molecular chaperones can modulate polyglutamine pathogenesis. To elucidate the basis of polyglutamine toxicity and the mechanism by which chaperones suppress neurodegeneration, <a href="#16" class="mim-tip-reference" title="Chan, H. Y. E., Warrick, J. M., Gray-Board, G. L., Paulson, H. L., Bonini, N. M. <strong>Mechanisms of chaperone suppression of polyglutamine disease: selectivity, synergy and modulation of protein solubility in Drosophila.</strong> Hum. Molec. Genet. 9: 2811-2820, 2000.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11092757/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11092757</a>] [<a href="https://doi.org/10.1093/hmg/9.19.2811" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11092757">Chan et al. (2000)</a> studied transgenic Drosophila disease models of MJD and Huntington disease (<a href="/entry/143100">143100</a>). They demonstrated that Hsp70 (see <a href="/entry/140559">140559</a>) and Hdj1, the Drosophila homolog of human DNAJB1 (<a href="/entry/604572">604572</a>), showed substrate specificity for polyglutamine proteins as well as synergy in suppression of neurotoxicity, and altered the solubility properties of the mutant polyglutamine protein. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11092757" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>By comparing previously reported genetic modifiers in 3 Drosophila models of human neurodegenerative disease, <a href="#30" class="mim-tip-reference" title="Ghosh, S., Feany, M. B. <strong>Comparison of pathways controlling toxicity in the eye and brain in Drosophila models of human neurodegenerative diseases.</strong> Hum. Molec. Genet. 13: 2011-2018, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15254017/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15254017</a>] [<a href="https://doi.org/10.1093/hmg/ddh214" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15254017">Ghosh and Feany (2004)</a> confirmed that protein folding, histone acetylation, and apoptosis are common features of neurotoxicity. Two novel genetic modifiers, the Drosophila homolog of ATXN2 (<a href="/entry/601517">601517</a>) and CGI7231, were identified. Cell-type specificity was demonstrated as many, but not all, retinal modifiers also modified toxicity in postmitotic neurons. <a href="#30" class="mim-tip-reference" title="Ghosh, S., Feany, M. B. <strong>Comparison of pathways controlling toxicity in the eye and brain in Drosophila models of human neurodegenerative diseases.</strong> Hum. Molec. Genet. 13: 2011-2018, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15254017/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15254017</a>] [<a href="https://doi.org/10.1093/hmg/ddh214" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15254017">Ghosh and Feany (2004)</a> identified nicotinamide, which has histone deacetylase-inhibiting activity, as a potent suppressor of polyglutamine toxicity. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15254017" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#46" class="mim-tip-reference" title="Jung, J., Bonini, N. <strong>CREB-binding protein modulates repeat instability in a Drosophila model for polyQ disease.</strong> Science 315: 1857-1859, 2007.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17332375/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17332375</a>] [<a href="https://doi.org/10.1126/science.1139517" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="17332375">Jung and Bonini (2007)</a> showed that the Drosophila model for the CAG/polyglutamine disease spinocerebellar ataxia type-3 (<a href="#123" class="mim-tip-reference" title="Warrick, J. M., Paulson, H. L., Gray-Board, G. L., Bui, Q. T., Fischbeck, K. H., Pittman, R. N., Bonini, N. M. <strong>Expanded polyglutamine protein forms nuclear inclusions and causes neural degeneration in Drosophila.</strong> Cell 93: 939-949, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9635424/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9635424</a>] [<a href="https://doi.org/10.1016/s0092-8674(00)81200-3" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9635424">Warrick et al., 1998</a>) recapitulates key features of human CAG repeat instability, including large repeat changes and strong expansion bias. Instability is dramatically enhanced by transcription and modulated by nuclear excision repair and CREB-binding protein (<a href="/entry/600140">600140</a>), a histone acetyltransferase whose decreased activity contributes to polyglutamine disease. Pharmacologic treatment normalizes acetylation-suppressed instability. Thus, <a href="#46" class="mim-tip-reference" title="Jung, J., Bonini, N. <strong>CREB-binding protein modulates repeat instability in a Drosophila model for polyQ disease.</strong> Science 315: 1857-1859, 2007.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17332375/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17332375</a>] [<a href="https://doi.org/10.1126/science.1139517" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="17332375">Jung and Bonini (2007)</a> concluded that toxic consequences of pathogenic polyglutamine protein may include enhancing repeat instability. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=17332375+9635424" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#2" class="mim-tip-reference" title="Alves, S., Regulier, E., Nascimento-Ferreira, I., Hassig, R., Dufour, N., Koeppen, A., Carvalho, A. L., Simoes, S., Pedroso de Lima, M. C., Brouillet, E., Gould, V. C., Deglon, N., de Almeida, L. P. <strong>Striatal and nigral pathology in a lentiviral rat model of Machado-Joseph disease.</strong> Hum. Molec. Genet. 17: 2071-2083, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18385100/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18385100</a>] [<a href="https://doi.org/10.1093/hmg/ddn106" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18385100">Alves et al. (2008)</a> used a lentivirus to overexpress expanded human ataxin-3 (72Q repeats) in specific areas of rat brain. In the substantia nigra, mutant ataxin-3 was found in punctate and mainly nuclear aggregates, colocalized with ubiquitin (UBB; <a href="/entry/191339">191339</a>) and alpha-synuclein (SNCA; <a href="/entry/163890">163890</a>), reminiscent of Parkinson disease (<a href="/entry/168600">168600</a>), and depleted TH (<a href="/entry/191290">191290</a>)-positive neurons. Animals with injection in the substantia nigra developed motor deficits, including rotational asymmetry. These findings were not observed in response to injection of wildtype ataxin-3. Injection of expanded ataxin-3 in the striatum resulted in dose- and time-dependent neuropathology, including intranuclear aggregation of ubiquitinated mutant ataxin-3 and condensation of cell nuclei. Striatal tissue from 3 human MJD patients showed similar neuropathology, indicating that striatal dysfunction is involved in disease pathogenesis. In mice, injection of mutant ataxin-3 in the cerebral cortex resulted in some aggregation, but did not result in major neuropathologic changes. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=18385100" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#8" class="mim-tip-reference" title="Boy, J., Schmidt, T., Wolburg, H., Mack, A., Nuber, S., Bottcher, M., Schmitt, I., Holzmann, C., Zimmermann, F., Servadio, A., Riess, O. <strong>Reversibility of symptoms in a conditional mouse model of spinocerebellar ataxia type 3.</strong> Hum. Molec. Genet. 18: 4282-4295, 2009.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19666958/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19666958</a>] [<a href="https://doi.org/10.1093/hmg/ddp381" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="19666958">Boy et al. (2009)</a> generated a conditional mouse model of SCA3. Transgenic mice developed a progressive neurologic phenotype characterized by neuronal dysfunction in the cerebellum, reduced anxiety, hyperactivity, impaired performance on the rotarod test, and lower body weight gain. When mutant ataxin-3 expression was turned off in symptomatic mice in an early disease state, the transgenic mice were indistinguishable from negative controls after 5 months of treatment. <a href="#8" class="mim-tip-reference" title="Boy, J., Schmidt, T., Wolburg, H., Mack, A., Nuber, S., Bottcher, M., Schmitt, I., Holzmann, C., Zimmermann, F., Servadio, A., Riess, O. <strong>Reversibility of symptoms in a conditional mouse model of spinocerebellar ataxia type 3.</strong> Hum. Molec. Genet. 18: 4282-4295, 2009.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19666958/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19666958</a>] [<a href="https://doi.org/10.1093/hmg/ddp381" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="19666958">Boy et al. (2009)</a> concluded that reducing the production of pathogenic ataxin-3 may be a promising approach to treat SCA3, provided that such treatment is applied before irreversible damage has taken place and that it is continued for a sufficiently long time. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=19666958" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#1" class="mim-tip-reference" title="Alves, S., Nascimento-Ferreira, I., Dufour, N., Hassig, R., Auregan, G., Nobrega, C., Brouillet, E., Hantraye, P., Pedroso de Lima, M. C., Deglon, N., Pereira de Almeida, L. <strong>Silencing ataxin-3 mitigates degeneration in a rat model of Machado-Joseph disease: no role for wild-type ataxin-3?</strong> Hum. Molec. Genet. 19: 2380-2394, 2010.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/20308049/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">20308049</a>] [<a href="https://doi.org/10.1093/hmg/ddq111" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="20308049">Alves et al. (2010)</a> both overexpressed and silenced wildtype ATX3 in the rat model of MJD developed by <a href="#2" class="mim-tip-reference" title="Alves, S., Regulier, E., Nascimento-Ferreira, I., Hassig, R., Dufour, N., Koeppen, A., Carvalho, A. L., Simoes, S., Pedroso de Lima, M. C., Brouillet, E., Gould, V. C., Deglon, N., de Almeida, L. P. <strong>Striatal and nigral pathology in a lentiviral rat model of Machado-Joseph disease.</strong> Hum. Molec. Genet. 17: 2071-2083, 2008.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18385100/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18385100</a>] [<a href="https://doi.org/10.1093/hmg/ddn106" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18385100">Alves et al. (2008)</a>. They found that overexpression of wildtype ATX3 did not protect against MJD pathology, that knockdown of wildtype ATX3 did not aggravate MJD pathology, and that non-allele-specific silencing of ataxin-3 strongly reduced neuropathology. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=18385100+20308049" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In a small molecule screen of FDA-approved drugs, <a href="#111" class="mim-tip-reference" title="Teixeira-Castro, A., Jalles, A., Esteves, S., Kang, S., da Silva Santos, L., Silva-Fernandes, A., Neto, M. F., Brielmann, R. M., Bessa, C., Duarte-Silva, S., Miranda, A., Oliveira, S., Neves-Carvalho, A., Bessa, J., Summavielle, T., Silverman, R. B., Oliveira, P., Morimoto, R. I., Maciel, P. <strong>Serotonergic signalling suppresses ataxin 3 aggregation and neurotoxicity in animal models of Machado-Joseph disease.</strong> Brain 138: 3221-3227, 2015.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/26373603/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">26373603</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=26373603[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1093/brain/awv262" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="26373603">Teixeira-Castro et al. (2015)</a> found that citalopram, a selective serotonin reuptake inhibitor (SSRI) that targets 5HT receptors, rescued neuronal dysfunction, reduced toxic Atxn3 aggregation, and improved locomotion defects in animal models of mutant Atnx3-induced neurotoxicity in C. elegans. Similar results were also obtained with mutant mice. Postmortem examination of the animals suggested that citalopram affected folding and stability of Atxn3 rather than clearance of the mutant protein. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=26373603" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a href="#Araki1980" class="mim-tip-reference" title="Araki, S., Kurihara, T., Tawara, S., Kuribayashi, T. <strong>Familial amyloidotic polyneuropathy in Japanese. In: Glenner, G. G.; Costa, P. P.; Freitas, A. F. (eds.): Amyloid and Amyloidosis.</strong> Amsterdam: Excerpta Medica (pub.) 1980. Pp. 67-77.">Araki et al. (1980)</a>; <a href="#Boyer1962" class="mim-tip-reference" title="Boyer, S. H., Chisholm, A. W., McKusick, V. A. <strong>Cardiac aspects of Friedreich's ataxia.</strong> Circulation 25: 493-505, 1962.">Boyer et al. (1962)</a>; <a href="#Chazot1983" class="mim-tip-reference" title="Chazot, G., Kopp, N., Barbeau, A., Trillet, M., Schott, B. <strong>La maladie de Joseph (2 cas dans une famille francaise). (Abstract)</strong> Rev. Neurol. 139: 228, 1983.">Chazot et al. (1983)</a>; <a href="#Dawson1977" class="mim-tip-reference" title="Dawson, D. M. <strong>Ataxia in families from the Azores. (Editorial)</strong> New Eng. J. Med. 296: 1529-1530, 1977.">Dawson (1977)</a>; <a href="#Rosenberg1981" class="mim-tip-reference" title="Rosenberg, R. N., Fowler, H. L. <strong>Autosomal dominant motor system disease of the Portuguese: a review.</strong> Neurology 31: 1124-1126, 1981.">Rosenberg and Fowler (1981)</a>; <a href="#Sachdev1982" class="mim-tip-reference" title="Sachdev, H. S., Forno, L. S., Kane, C. A. <strong>Joseph disease: a multisystem degenerative disorder of the nervous system.</strong> Neurology 32: 192-195, 1982.">Sachdev et al. (1982)</a>; <a href="#Sequeiros1984" class="mim-tip-reference" title="Sequeiros, J., Silva, R. M., Rosenberg, R. N. <strong>Epidemiology of Machado-Joseph disease. (Abstract)</strong> Clin. Res. 32: 693A, 1984.">Sequeiros et al. (1984)</a>; <a href="#Suite1986" class="mim-tip-reference" title="Suite, N. D. A., Sequeiros, J., McKhann, G. M. <strong>Machado-Joseph disease in a Sicilian-American family.</strong> J. Neurogenet. 3: 177-182, 1986.">Suite et al. (1986)</a>
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Alves, S., Nascimento-Ferreira, I., Dufour, N., Hassig, R., Auregan, G., Nobrega, C., Brouillet, E., Hantraye, P., Pedroso de Lima, M. C., Deglon, N., Pereira de Almeida, L.
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<strong>Silencing ataxin-3 mitigates degeneration in a rat model of Machado-Joseph disease: no role for wild-type ataxin-3?</strong>
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Hum. Molec. Genet. 19: 2380-2394, 2010.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/20308049/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">20308049</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20308049" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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Alves, S., Regulier, E., Nascimento-Ferreira, I., Hassig, R., Dufour, N., Koeppen, A., Carvalho, A. L., Simoes, S., Pedroso de Lima, M. C., Brouillet, E., Gould, V. C., Deglon, N., de Almeida, L. P.
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<strong>Striatal and nigral pathology in a lentiviral rat model of Machado-Joseph disease.</strong>
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Hum. Molec. Genet. 17: 2071-2083, 2008.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18385100/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18385100</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=18385100" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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Araki, S., Kurihara, T., Tawara, S., Kuribayashi, T.
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<strong>Familial amyloidotic polyneuropathy in Japanese. In: Glenner, G. G.; Costa, P. P.; Freitas, A. F. (eds.): Amyloid and Amyloidosis.</strong>
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Amsterdam: Excerpta Medica (pub.) 1980. Pp. 67-77.
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Barbeau, A., Roy, M., Cunha, L., de Vincente, A. N., Rosenberg, R. N., Nyhan, W. L., MacLeod, P. L., Chazot, G., Langston, L. B., Dawson, D. M., Coutinho, P.
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<strong>The natural history of Machado-Joseph disease: an analysis of 138 personally examined cases.</strong>
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Canad. J. Neurol. Sci. 11: 510-525, 1984.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6509398/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6509398</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6509398" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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Basri, R., Yabe, I., Soma, H., Sasaki, H.
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<strong>Spectrum and prevalence of autosomal dominant spinocerebellar ataxia in Hokkaido, the northern island of Japan: a study of 113 Japanese families.</strong>
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J. Hum. Genet. 52: 848-855, 2007.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17805477/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17805477</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17805477" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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[<a href="https://doi.org/10.1007/s10038-007-0182-x" target="_blank">Full Text</a>]
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Bettencourt, C., Fialho, R. N., Santos, C., Montiel, R., Bruges-Armas, J., Maciel, P., Lima, M.
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<strong>Segregation distortion of wild-type alleles at the Machado-Joseph disease locus: a study in normal families from the Azores islands (Portugal).</strong>
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J. Hum. Genet. 53: 333-339, 2008.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18286225/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18286225</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=18286225" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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[<a href="https://doi.org/10.1007/s10038-008-0261-7" target="_blank">Full Text</a>]
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Boller, F., Segarra, J. M.
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<strong>Spino-pontine degeneration.</strong>
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Europ. Neurol. 2: 356-373, 1969.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5808476/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5808476</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=5808476" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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[<a href="https://doi.org/10.1159/000113812" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1093/brain/119.5.1497" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1007/s004150050456" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1212/wnl.43.9.1750" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1001/archneur.55.10.1353" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1212/wnl.28.7.703" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1007/BF00692697" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1212/wnl.32.11.1272" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1001/archneur.64.12.1767" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1001/archneur.65.4.525" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1093/hmg/9.13.1957" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1086/318184" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1093/brain/118.5.1077" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1212/wnl.44.7.1298" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1016/s0092-8674(00)81743-2" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1002/1096-8628(20001211)95:4<351::aid-ajmg10>3.0.co;2-r" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1111/j.1399-0004.2006.00656.x" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1001/archneur.61.2.257" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1001/archneur.62.4.630" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1038/jhg.2014.117" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1034/j.1399-0004.2002.620610.x" target="_blank">Full Text</a>]
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Hilary J. Vernon - updated : 02/26/2021
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Cassandra L. Kniffin - updated : 5/31/2016<br>Cassandra L. Kniffin - updated : 3/24/2016<br>George E. Tiller - updated : 8/5/2013<br>Cassandra L. Kniffin - updated : 3/19/2012<br>Ada Hamosh - updated : 2/7/2012<br>George E. Tiller - updated : 12/29/2010<br>Cassandra L. Kniffin - updated : 8/3/2010<br>Patricia A. Hartz - updated : 11/16/2009<br>Cassandra L. Kniffin - updated : 8/27/2009<br>Cassandra L. Kniffin - updated : 6/23/2009<br>Cassandra L. Kniffin - updated : 3/18/2009<br>Cassandra L. Kniffin - updated : 1/5/2009<br>George E. Tiller - updated : 12/9/2008<br>Cassandra L. Kniffin - updated : 10/6/2008<br>Cassandra L. Kniffin - updated : 7/7/2008<br>Cassandra L. Kniffin - updated : 3/31/2008<br>Cassandra L. Kniffin - updated : 3/6/2008<br>Cassandra L. Kniffin - updated : 1/14/2008<br>Ada Hamosh - updated : 4/13/2007<br>George E. Tiller - updated : 3/21/2007<br>Cassandra L. Kniffin - updated : 9/18/2006<br>Cassandra L. Kniffin - updated : 8/22/2005<br>John Logan Black, III - updated : 7/22/2005<br>Cassandra L. Kniffin - updated : 6/2/2005<br>Cassandra L. Kniffin - updated : 5/18/2005<br>Cassandra L. Kniffin - updated : 4/19/2005<br>Cassandra L. Kniffin - updated : 12/15/2004<br>Cassandra L. Kniffin - updated : 7/27/2004<br>Cassandra L. Kniffin - updated : 7/12/2004<br>Cassandra L. Kniffin - updated : 5/25/2004<br>Cassandra L. Kniffin - updated : 8/7/2003<br>Cassandra L. Kniffin - updated : 2/12/2003<br>Victor A. McKusick - updated : 12/26/2002<br>Cassandra L. Kniffin - updated : 12/6/2002<br>Cassandra L. Kniffin - updated : 9/4/2002<br>Cassandra L. Kniffin - updated : 8/15/2002<br>Cassandra L. Kniffin - reorganized : 6/21/2002<br>Cassandra L. Kniffin - updated : 6/17/2002<br>Victor A. McKusick - updated : 12/21/2001<br>Victor A. McKusick - updated : 7/18/2001<br>Victor A. McKusick - updated : 3/8/2001<br>George E. Tiller - updated : 2/5/2001<br>Sonja A. Rasmussen - updated : 1/9/2001<br>George E. Tiller - updated : 11/20/2000<br>George E. Tiller - updated : 10/25/2000<br>Victor A. McKusick - updated : 1/14/2000<br>Victor A. McKusick - updated : 12/9/1999<br>Victor A. McKusick - updated : 10/13/1999<br>Wilson H. Y. Lo - updated : 9/21/1999<br>Victor A. McKusick - updated : 9/15/1999<br>Wilson H. Y. Lo - updated : 8/10/1999<br>Victor A. McKusick - updated : 5/13/1999<br>Patti M. Sherman - updated : 3/8/1999<br>Victor A. McKusick - updated : 2/3/1999<br>Stylianos E. Antonarakis - updated : 10/8/1998<br>Stylianos E. Antonarakis - updated : 7/14/1998<br>Victor A. McKusick - updated : 5/12/1998<br>Ethylin Wang Jabs - updated : 7/21/1997<br>Victor A. McKusick - edited : 5/29/1997<br>Victor A. McKusick - updated : 4/21/1997<br>Victor A. McKusick - updated : 2/19/1997<br>Moyra Smith - updated : 8/15/1996<br>Orest Hurko - updated : 3/27/1996<br>Moyra Smith - updated : 3/26/1996
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Creation Date:
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Victor A. McKusick : 6/16/1986
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carol : 11/29/2023
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alopez : 06/22/2022<br>carol : 05/02/2022<br>carol : 02/26/2021<br>carol : 05/22/2018<br>alopez : 05/21/2018<br>carol : 06/03/2016<br>carol : 6/2/2016<br>carol : 6/1/2016<br>ckniffin : 5/31/2016<br>carol : 3/25/2016<br>ckniffin : 3/24/2016<br>alopez : 8/5/2013<br>carol : 7/26/2013<br>carol : 3/20/2012<br>ckniffin : 3/19/2012<br>alopez : 2/8/2012<br>terry : 2/7/2012<br>alopez : 9/22/2011<br>wwang : 1/11/2011<br>terry : 12/29/2010<br>carol : 12/21/2010<br>ckniffin : 11/16/2010<br>wwang : 10/21/2010<br>wwang : 8/4/2010<br>ckniffin : 8/3/2010<br>mgross : 11/16/2009<br>wwang : 9/29/2009<br>ckniffin : 8/27/2009<br>wwang : 6/26/2009<br>ckniffin : 6/23/2009<br>wwang : 3/24/2009<br>ckniffin : 3/18/2009<br>wwang : 1/14/2009<br>ckniffin : 1/5/2009<br>wwang : 12/9/2008<br>carol : 12/2/2008<br>wwang : 10/16/2008<br>ckniffin : 10/6/2008<br>wwang : 7/10/2008<br>ckniffin : 7/7/2008<br>wwang : 4/7/2008<br>ckniffin : 3/31/2008<br>wwang : 3/19/2008<br>ckniffin : 3/6/2008<br>carol : 1/21/2008<br>ckniffin : 1/14/2008<br>carol : 8/17/2007<br>alopez : 4/13/2007<br>wwang : 3/22/2007<br>terry : 3/21/2007<br>wwang : 9/22/2006<br>ckniffin : 9/18/2006<br>wwang : 11/14/2005<br>ckniffin : 11/3/2005<br>wwang : 8/29/2005<br>ckniffin : 8/22/2005<br>carol : 7/25/2005<br>terry : 7/22/2005<br>wwang : 6/15/2005<br>wwang : 6/13/2005<br>ckniffin : 6/2/2005<br>wwang : 6/1/2005<br>wwang : 5/26/2005<br>ckniffin : 5/18/2005<br>tkritzer : 5/9/2005<br>ckniffin : 4/19/2005<br>tkritzer : 12/15/2004<br>ckniffin : 12/15/2004<br>tkritzer : 11/8/2004<br>tkritzer : 7/28/2004<br>ckniffin : 7/27/2004<br>tkritzer : 7/13/2004<br>ckniffin : 7/12/2004<br>tkritzer : 5/27/2004<br>ckniffin : 5/25/2004<br>tkritzer : 1/28/2004<br>ckniffin : 1/21/2004<br>tkritzer : 8/13/2003<br>ckniffin : 8/7/2003<br>carol : 2/25/2003<br>ckniffin : 2/12/2003<br>tkritzer : 12/27/2002<br>terry : 12/26/2002<br>carol : 12/16/2002<br>tkritzer : 12/16/2002<br>ckniffin : 12/6/2002<br>carol : 9/10/2002<br>ckniffin : 9/4/2002<br>carol : 8/22/2002<br>ckniffin : 8/22/2002<br>ckniffin : 8/15/2002<br>carol : 6/21/2002<br>ckniffin : 6/21/2002<br>ckniffin : 6/20/2002<br>carol : 6/17/2002<br>ckniffin : 6/17/2002<br>cwells : 5/29/2002<br>terry : 12/21/2001<br>mcapotos : 8/9/2001<br>terry : 7/18/2001<br>mcapotos : 3/20/2001<br>mcapotos : 3/16/2001<br>terry : 3/8/2001<br>cwells : 2/5/2001<br>cwells : 2/5/2001<br>cwells : 2/5/2001<br>cwells : 1/31/2001<br>mcapotos : 1/9/2001<br>mcapotos : 1/9/2001<br>mcapotos : 11/20/2000<br>mcapotos : 11/10/2000<br>mcapotos : 11/1/2000<br>mcapotos : 10/25/2000<br>mcapotos : 1/28/2000<br>terry : 1/14/2000<br>mgross : 12/13/1999<br>terry : 12/9/1999<br>mgross : 10/18/1999<br>terry : 10/13/1999<br>carol : 9/21/1999<br>mgross : 9/21/1999<br>mgross : 9/16/1999<br>terry : 9/15/1999<br>carol : 8/10/1999<br>mgross : 5/27/1999<br>mgross : 5/20/1999<br>terry : 5/13/1999<br>carol : 3/9/1999<br>psherman : 3/8/1999<br>psherman : 3/8/1999<br>carol : 2/11/1999<br>terry : 2/3/1999<br>carol : 12/3/1998<br>carol : 10/8/1998<br>dkim : 9/11/1998<br>carol : 7/14/1998<br>carol : 5/19/1998<br>joanna : 5/13/1998<br>carol : 5/12/1998<br>terry : 4/7/1998<br>alopez : 3/27/1998<br>terry : 3/25/1998<br>mark : 9/3/1997<br>terry : 9/2/1997<br>mark : 8/1/1997<br>mark : 8/1/1997<br>mark : 7/31/1997<br>alopez : 7/30/1997<br>alopez : 7/9/1997<br>joanna : 5/29/1997<br>alopez : 4/21/1997<br>alopez : 4/17/1997<br>alopez : 4/17/1997<br>terry : 4/11/1997<br>mark : 2/19/1997<br>terry : 2/11/1997<br>terry : 8/15/1996<br>mark : 8/15/1996<br>mark : 8/8/1996<br>mark : 7/22/1996<br>mark : 5/31/1996<br>terry : 5/29/1996<br>mark : 4/27/1996<br>terry : 4/19/1996<br>terry : 4/15/1996<br>mark : 3/27/1996<br>mark : 3/26/1996<br>terry : 3/19/1996<br>mark : 10/19/1995<br>carol : 12/5/1994<br>terry : 7/28/1994<br>jason : 7/1/1994<br>davew : 6/8/1994<br>mimadm : 4/14/1994
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<strong>#</strong> 109150
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MACHADO-JOSEPH DISEASE; MJD
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SPINOCEREBELLAR ATAXIA 3; SCA3<br />
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SPINOCEREBELLAR ATROPHY III<br />
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AZOREAN NEUROLOGIC DISEASE<br />
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SPINOPONTINE ATROPHY<br />
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NIGROSPINODENTATAL DEGENERATION
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<strong>SNOMEDCT:</strong> 91952008;
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<strong>ORPHA:</strong> 276238, 276241, 276244, 98757;
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<strong>DO:</strong> 1440;
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<strong>Phenotype-Gene Relationships</strong>
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Inheritance
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<span class="mim-font">
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14q32.12
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Machado-Joseph disease
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<span class="mim-font">
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109150
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Autosomal dominant
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<span class="mim-font">
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3
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ATXN3
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<span class="mim-font">
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607047
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<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because Machado-Joseph disease (MJD), also known as spinocerebellar ataxia-3 (SCA3), is caused by a heterozygous (CAG)n trinucleotide repeat expansion encoding glutamine repeats in the ataxin-3 gene (ATXN3; 607047) on chromosome 14q32.</p><p>Normal individuals have up to 44 glutamine repeats, and MJD patients have between 52 and 86 glutamine repeats. Incomplete penetrance is associated with 45 to 51 repeats (Todd and Paulson, 2010). </p><p>For a general discussion of autosomal dominant spinocerebellar ataxia, see SCA1 (164400).</p>
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<strong>Description</strong>
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<p>Machado-Joseph disease (MJD), named for affected families of Azorean extraction, is an autosomal dominant progressive neurologic disorder characterized principally by ataxia, spasticity, and ocular movement abnormalities. Although independently described as a seemingly separate disorder, spinocerebellar ataxia-3 (SCA3) is now known to be the same as Machado-Joseph disease.</p><p>Three classic clinical subtypes of MJD are recognized: type 1 with early onset and marked pyramidal and dystonic signs; type 2, or pure, with predominant cerebellar ataxia; and type 3 with later-onset and peripheral neuropathy (Franca et al., 2008). </p>
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<strong>Clinical Features</strong>
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<p><strong><em>Early Descriptions, Diagnostic Uncertainties, and Geographic Distribution</em></strong></p><p>
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Among Portuguese immigrants living in New England, Nakano et al. (1972) described a form of dominantly inherited ataxia occurring in descendants of William Machado, a native of an island in the Portuguese Azores. The disorder began as ataxic gait after age 40. Six patients studied in detail showed abnormally large amounts of air in the posterior fossa on pneumoencephalogram, denervation atrophy of muscle, and diabetes mellitus. Other families of Azorean origin living in Massachusetts (Romanul et al., 1977; Woods and Schaumburg, 1972) and in California (Rosenberg et al., 1976) were reported. Romanul et al. (1977) suggested that all 4 reported kindreds had the same mutant gene despite differences in expression. The progressive neurologic disorder was characterized by gait ataxia, features similar to those in Parkinson disease (PD; 168600) in some patients, limitation of eye movements, widespread fasciculations of muscles, loss of reflexes in the lower limbs, followed by nystagmus, mild cerebellar tremors, and extensor plantar responses. Postmortem examinations showed loss of neurons and gliosis in the substantia nigra, nuclei pontis (and in the putamen in one case) as well as the nuclei of the vestibular and cranial nerves, columns of Clarke and anterior horns. Rosenberg (1977) referred to the disorder he and his colleagues described as Joseph disease (Rosenberg et al., 1976) and questioned that one can be certain of its identity to the disorder in other families of Azorean origin. </p><p>In January 1976, Corino Andrade (Coutinho et al., 1977) 'went to the Azores...to investigate a degenerative disease of the central nervous system known to exist there. We saw 40 patients belonging to 15 families (in the islands of Flores and St. Michael)...It is our opinion that different families just mentioned, which have been taken as separate diseases, are only clinically diverse forms of the same disorder, of which symptomatic pleomorphism is a conspicuous feature.' In the same year, Romanul et al. (1977) arrived at the same conclusion. The full paper by Coutinho and Andrade (1978) appeared the next year. Lima and Coutinho (1980) described a mainland Portuguese family. The possibility that the Joseph family was originally Sephardic Jewish was raised by Sequeiros and Coutinho (1981). Mainland families originated in a mountainous and relatively inaccessible region of northeastern Portugal where large communities of Sephardic Jews settled at one time. </p><p>Under the designation 'spinopontine degeneration,' Boller and Segarra (1969) reported 24 persons with late-onset ataxia in 4 generations of an Anglo-Saxon family. Taniguchi and Konigsmark (1971) described 16 affected persons in 3 generations of a black family. The pathologic findings were similar in the 2 families. The cerebellum was relatively spared and the inferior olives were normal. The spinal cord showed loss of myelinated fibers in the spinocerebellar tracts and posterior funiculi. There was also marked loss of nuclei basis ponti. Pogacar et al. (1978) followed up on the Boller-Segarra family (members of which had lived in northern Rhode Island for over 300 years). In 2 clinical cases and 1 autopsy, they questioned the separation from olivopontocerebellar ataxia (SCA1; 164400), because they found abolished tendon reflexes and flexion contractures of the legs in 1 patient, and onset at 18 years of age, palatal myoclonus and optic atrophy in the second. Dementia developed in both. Pathologic findings, in contrast to earlier reports, showed involvement of the cerebellum and inferior olivary nuclei. </p><p>Coutinho and Andrade (1978) proposed a 3-way phenotypic classification for MJD: cerebellar ataxia, external ophthalmoplegia and pyramidal signs (type 2), additional predominant extrapyramidal signs (type 1), and additional distal muscular atrophy (type 3). Although not completely specific to MJD, dystonia, facial and lingual fasciculations, and peculiar, bulging eyes represent a constellation strongly suggestive of this disease. Rosenberg (1983) added a fourth phenotype: neuropathy and parkinsonism. </p><p>Coutinho et al. (1982) described the presumedly homozygotic son of 2 affected parents; the son had onset at age 8 and died of the disease at age 15. Another son of these parents had onset at age 7. As with other late-onset dominant spinocerebellar degenerations (notably the olivopontocerebellar degenerations), there is considerable phenotypic variation even within the same family. Barbeau et al. (1984) gave an extensive review. </p><p>Sequeiros (1985) pointed out that the diagnosis of Machado-Joseph disease had been made (Healton et al., 1980) in an American black family originating from North Carolina; that on further check this proved to be the family reported by Taniguchi and Konigsmark (1971); that Coutinho et al. (1982), in commenting on the neuropathology of Machado-Joseph disease, noted the similarity to the spinopontine atrophy reported by Boller and Segarra (1969), Taniguchi and Konigsmark (1971), and Ishino et al. (1971); and, finally, that the disorder reported in the last family, Japanese, had been proved to be Machado-Joseph disease. See Sequeiros and Suite (1986). Lazzarini et al. (1992) expanded on the pedigree of the family first reported by Boller and Segarra (1969) and concluded that the disorder represented a spinocerebellar ataxia phenotypically similar to that of spinocerebellar ataxia type 1, which shows linkage to HLA. However, linkage to HLA was excluded in this kindred, leading to the designation SCA2 (183090) for this and other HLA-unlinked SCA kindreds. Silveira et al. (1993) demonstrated that the disorder designated Holguin ataxia, or SCA2, that is frequent in Cubans, is genetically distinct from MJD; MJD was excluded from a location on 12q where linkage studies showed the SCA2 locus to be situated. </p><p>Eto et al. (1990) described a family of German extraction with progressive ataxia, eye movement abnormalities, peripheral sensory loss, and spinal muscular atrophy of adult onset. The pedigree pattern in 4 generations was consistent with autosomal dominant inheritance. Eto et al. (1990) suggested that the form of spinopontine atrophy might be different from Machado-Joseph disease: the eyes were not protuberant, extraocular movements were abnormal to a minor degree, and neuropathologically the substantia nigra and dentate nucleus were spared. Eto et al. (1990) considered their family to resemble most that reported by Boller and Segarra (1969). </p><p>Takiyama et al. (1994) compared the clinical and pathologic features of SCA1 and SCA2 to those in a large Japanese family with Machado-Joseph disease that had previously been linked to markers on chromosome 14q. Although many of the clinical features and the age of onset were similar to those of SCA1 and SCA2, other features were more distinctive for Machado-Joseph disease. These included dystonia, difficulty in opening of the eyelids, slowness of movements, bulging eyes, and facial-lingual fasciculations. One autopsy showed few changes in either the inferior olive or the Purkinje cells, in sharp contrast to SCA1 and SCA2 where such changes are pronounced. The subthalamopallidal system of the MJD patient showed marked degeneration, which has not been described in SCA1 or SCA2. </p><p>Seto and Tsujihata (1999) studied a cluster of MJD in a small rural town near Nagasaki City, Japan. They stated that Sakai et al. (1983) described the first family with MJD in Japan, and that Japan had the largest number of reported MJD families in the world. One family studied by Seto and Tsujihata (1999) had 20 affected persons among 73 descending from an ancestor born in 1839. This ancestor had been told that he was a child of unknown non-Japanese parentage (probably Portuguese). The second family had 12 affected persons among 43 with a common ancestor born in 1897. Unsteady gait was the most frequent initial symptom. Age at onset varied from 11 to 51 years with a mean in males of 36.5 and in females of 39.7 years. Anticipation was observed in both families. Three patients had shown only ocular signs: nystagmus, external ophthalmoplegia, and/or blepharoptosis. Bulging eyes were found in only 4 patients. The authors stated that Nagasaki was the only open Japanese port during the Edo period (1635 to 1868). </p><p>Livingstone and Sequeiros (1984) noted that 28 families with Machado-Joseph disease had been described in the Azorean Islands, mainly Flores and Sao Miguel, and 3 non-Azorean families in northeast Portugal. Burt et al. (1993) described a dominantly inherited form of ataxia resembling Machado-Joseph disease in members of 4 families of the Arnhem Land Aboriginal people of northern Australia. Portuguese ancestry was possible, although not proven. Goldberg-Stern et al. (1994) reported a family of Machado-Joseph disease in a Yemenite Jewish kindred that originated from a remote village named Ta'izz. This family, incidentally named Yoseph, had no documentation of Portuguese ancestry. Portuguese trade connections with the Yemenites most likely did not reach Ta'izz which is far from the coast and is almost inaccessible because of a wall of high mountains. </p><p><strong><em>Oculomotor Abnormalities</em></strong></p><p>
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Among 65 patients with SCA1, SCA2, or SCA3, Burk et al. (1996) found reduced saccade velocity in 56%, 100%, and 30% of patients, respectively. MRI showed severe olivopontocerebellar atrophy in SCA2, similar but milder changes in SCA1, and very mild atrophy with sparing of the olives in SCA3. Careful examination of 3 major criteria of eye movements, saccade amplitude, saccade velocity, and presence of gaze-evoked nystagmus, permitted Rivaud-Pechoux et al. (1998) to assign over 90% of patients with SCA1, SCA2, or SCA3 to their genetically confirmed patient group. In SCA1, saccade amplitude was significantly increased, resulting in hypermetria. In SCA2, saccade velocity was markedly decreased. In SCA3, the most characteristic finding was the presence of gaze-evoked nystagmus. </p><p>In an investigation of oculomotor function, Buttner et al. (1998) found that all 3 patients with SCA1, all 7 patients with SCA3, and all 5 patients with SCA6 (183086) had gaze-evoked nystagmus. Three of 5 patients with SCA2 did not have gaze-evoked nystagmus, perhaps because they could not generate corrective fast components. Rebound nystagmus occurred in all SCA3 patients, 33% of SCA1 patients, 40% of SCA6 patients, and none of SCA2. Spontaneous downbeat nystagmus only occurred in SCA6. Peak saccade velocity was decreased in 100% of patients with SCA2, 1 patient with SCA1, and no patients with SCA3 or SCA6. Saccade hypermetria was found in all types, but was most common in SCA3. Burk et al. (1999) found that gaze-evoked nystagmus was not associated with SCA2. However, severe saccade slowing was highly characteristic of SCA2. Saccade velocity in SCA3 was normal to mildly reduced. The gain in vestibuloocular reflex was significantly impaired in SCA3 and SCA1. Eye movement disorders of SCA1 overlapped with both SCA2 and SCA3. </p><p>The reticulotegmental nucleus of the pons (RTTG), also known as the nucleus of Bechterew, is a precerebellar nucleus important in the premotor oculomotor circuits crucial for the accuracy of horizontal saccades and the generation of horizontal smooth pursuit. By postmortem examination, Rub et al. (2004) identified neuronal loss and astrogliosis in the RTTG in 1 of 2 SCA1 patients, 2 of 4 SCA2 patients, and 4 of 4 SCA3 patients that correlated with clinical findings of hypometric saccades and slowed and saccadic smooth pursuits. The 3 patients without these specific oculomotor findings had intact RTTG regions. The authors concluded that the neurodegeneration associated with SCA1, SCA2, and SCA3 affects premotor networks in addition to motor nuclei in a subset of patients. </p>
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<strong>Other Features</strong>
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<p>In 19 of 27 (70%) patients with confirmed SCA types 1, 2, 3, 6, or 7 (164500), van de Warrenburg et al. (2004) found electrophysiologic evidence of peripheral nerve involvement. Eight patients (30%) had findings compatible with a dying-back axonopathy, whereas 11 patients (40%) had findings consistent with a primary neuronopathy involving dorsal root ganglion and/or anterior horn cells; the 2 types were clinically almost indistinguishable. Of 8 patients with SCA3, 5 had a neuronopathy and 4 had a sensorimotor axonopathy. </p><p>In a detailed neuropsychologic study, Kawai et al. (2004) found that 16 Japanese MJD patients had verbal and visual memory deficits, impaired verbal fluency, and impaired visuospatial and constructional function compared to controls. In addition, the patients were more depressed and anxious than controls. There was no correlation between cognitive impairment and CAG repeat length. The findings were consistent with widespread dysfunction of the cerebral cortex and/or impairment of the cerebellar cortical circuits. </p><p>Yeh et al. (2005) reported autonomic dysfunction among patients with MJD confirmed by genetic analysis. Ten (66%) of 15 patients reported at least 3 diverse autonomic symptoms, most commonly nocturia, cold intolerance, orthostatic dizziness, dry eyes, dry mouth, and impaired near vision. Electrophysiologic studies showed parasympathetic cardiovagal dysfunction in 71% of patients and sympathetic sudomotor dysfunction in 73% of patients. </p><p>Franca et al. (2007) found that 33 (47%) of 70 patients with MJD reported chronic pain, most often in the lumbar back and lower limbs. </p><p>Franca et al. (2008) observed muscle excitability abnormalities in 41 (82%) of 50 men with MJD, 10 (20%) of whom reported muscle cramps as the presenting complaint. Fifteen patients had fasciculations on clinical exam, and 25 had fasciculations identified on EMG testing. Those with fasciculations had a higher frequency of peripheral neuropathy. Franca et al. (2008) noted that damage to motor axons in classic motor neuron disease leads to collateral nerve sprouting with overexpression of ionic channels that results in spontaneous ectopic activity and muscle cramping. While this mechanism may be at work in some MJD patients, others may have cramps and/or fasciculations due to altered excitatory inputs from damaged corticospinal fibers. Kanai and Kuwabara (2009) commented that they considered muscle cramps in MJD to be primarily a symptom of peripheral motor nerve sprouting and hyperexcitability, particularly in the early stages of the disease. </p><p><strong><em>Clinical Variability</em></strong></p><p>
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Munchau et al. (1999) described a German woman who presented with severe generalized dystonia beginning at the age of 18 years when she noticed involuntary twisting and cramping of her right hand and twisting of both feet shortly thereafter. Symptoms worsened when she was stressed. At the age of 19 years, she began to grimace when talking and laughing, and her speech became difficult to understand. Over a period of 2 years her symptoms deteriorated, and she became unable to walk without support. She was found to be heterozygous for the ATXN3 gene, with a CAG repeat length of 81 +/- 2 and 14 +/- 1 in the mutated expanded allele and in the normal allele, respectively. Remarkably, cerebellar function was normal apart from mild oculomotor abnormalities. Severe dystonia as a presenting feature had never been described in patients from Germany, where MJD represented 50% of autosomal dominant cerebellar ataxia (ADCA) cases. </p><p>In a family of African descent in which 3 members presented with phenotypic features reminiscent of typical Parkinson disease (PD; 168600), Gwinn-Hardy et al. (2001) identified pathogenic expansions in the ATXN3 gene (607047). Features suggestive of PD included bradykinesis, facial masking, rigidity, postural instability, shuffling, asymmetric onset, dopamine responsiveness, and lack of atypical features often associated with SCA3. A fourth, mildly symptomatic patient also carried the repeat expansion. The authors suggested that the low numbers of repeats in this family (67-75; normal, 16-34) presenting with parkinsonism may be associated with ethnic background and that evaluation for SCA3 should be considered in similar cases. </p><p>In a study of 412 individuals with MJD, Kieling et al. (2007) found that the estimated mean survival time was 63.96 years, compared to 78.61 years in unaffected relatives. For a subset of 366 patients, mean age at onset was 36.37 years with a survival of 21.18 years. Early onset and increased CAG length predicted shorter overall survival times. </p><p>Zeng et al. (2015) reported a Chinese man, born of consanguineous parents, who was homozygous for a pathogenic ATXN3 repeat expansion (71/71) and showed onset of symptoms at age 18 years. He initially developed gait disturbances and slurred speech. Several years later, he had spastic gait, dysphagia, nystagmus, saccade hypermetria, and mild hearing loss. Brain imaging did not show cerebellar or brainstem atrophy. His parents, who were in their mid forties, showed only mild symptoms of the disorder. </p>
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<p>Machado-Joseph disease is an autosomal dominant disorder. Sequeiros and Coutinho (1981) identified 9 cases of 'skipped generations' (penetrance = 94.5%).</p><p>Some individuals, usually born of consanguineous unions, may be homozygous for a pathogenic ATXN3 allele. These individuals usually show an earlier age at disease onset and more severe symptoms (summary by Zeng et al., 2015). </p>
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<strong>Diagnosis</strong>
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<p>Dawson et al. (1982) suggested that the electrooculogram may be useful in early detection. </p><p>The finding of 'intermediate alleles' presented a problem in the Portuguese MJD Predictive Testing Program. A second problem was the issue of homoallelism, i.e., homozygosity for 2 normal alleles with exactly the same (CAG)n length, which was found in about 10% of all test results. Maciel et al. (2001) reported a study in which an affected patient carried a 71 and a 51 CAG repeat and 2 asymptomatic relatives carried the 51 CAG repeat and normal-size alleles. The results suggested that the 51 CAG repeat is not associated with disease. The intermediate alleles were not present in a large sample of the healthy population from the same region. Intragenic polymorphisms allowed distinction of the 2 different normal alleles in all cases of homoallelism. An improved protocol for molecular testing for MJD was proposed. </p>
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<strong>Mapping</strong>
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<p>In 7 French autosomal dominant SCA families, previously excluded from linkage to the region of chromosome 6 carrying SCA1, Gispert et al. (1993) also excluded linkage to the region of chromosome 12 carrying the SCA2 locus (183090), thus providing evidence for the existence of a third SCA locus, SCA3. </p><p>Stevanin et al. (1994) reported linkage studies in 3 of these French families, in 2 of which location of the gene at 14q24.3-qter was possible. Combined analysis of the families placed the SCA3 locus in a 15-cM interval between markers D14S67 and D14S81. Stevanin et al. (1995) narrowed the mapping of SCA3 to a 3-cM interval on 14q. In the third family, Stevanin et al. (1994) excluded linkage to the sites of SCA1, SCA2, and SCA3, thus indicating the existence of a fourth ADCA type I locus. </p><p>In Japanese kindreds with MJD, Takiyama et al. (1993) assigned the disease locus to 14q24.3-q32 by genetic linkage to microsatellite loci D14S55 and D14S48; multipoint maximum lod score = 9.719. Using 4 microsatellite DNA polymorphisms (STRPs), Sequeiros et al. (1994) likewise mapped the MJD gene to 14q. Using HOMOG, Sequeiros et al. (1994) could find no evidence for heterogeneity with the 5 Japanese families in whom linkage had been reported. St. George-Hyslop et al. (1994) provided evidence that MJD in 5 pedigrees of Azorean descent was also linked to 14q in an 18-cM region between the markers D14S67 and AACT (107280); multipoint lod score = 7.00 near D14S81. They also reported molecular evidence for homozygosity at the MJD locus in an MJD-affected subject with severe, early-onset symptoms. </p><p>Twist et al. (1995) studied 6 MJD families of Portuguese/Azorean origin and 1 of Brazilian origin, using 9 microsatellite markers mapped to 14q24.3-q32. </p><p>A fourth SCA locus was suggested by the report of Twells et al. (1994) in which linkage to the regions of chromosomes 6, 12, and 14, where forms of SCA had previously been mapped, was excluded in a large Thai kindred in which dominant cerebellar ataxia was often combined with frontal lobe signs and dementia. Similarly, Lopes-Cendes et al. (1994) excluded linkage with these 3 loci in a large French-Canadian kindred with 4 generations of living affected individuals in 4 generations. </p>
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<strong>Molecular Genetics</strong>
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<p>Kawaguchi et al. (1994) identified a common mutation in the MJD gene as the cause of Machado-Joseph disease. In normal individuals, the gene was found to contain between 13 and 36 CAG repeats, whereas most of the patients with clinically diagnosed MJD and all of the affected members of a family with the clinical and pathologic diagnosis of MJD showed expansion of the repeat number to the range of 68 to 79 (607047.0001). Schols et al. (1995) provided definitive proof that mutation in the ATXN3 gene cause SCA3. </p><p>Giunti et al. (1995) surveyed members of 63 families with a variety of autosomal dominant late-onset cerebellar ataxias for the CAG repeat expansion described in association with Machado-Joseph disease. The MJD mutation was identified in 9 families segregating progressive adult-onset cerebellar degeneration with variable supranuclear ophthalmoplegia, optic atrophy, mild dementia, peripheral neuropathy, or extrapyramidal dysfunction, corresponding to Harding's classification of ADCA type I (Harding, 1982). Most of the patients with ADCA type I have olivopontocerebellar atrophy at autopsy. Giunti et al. (1995) noted that this mutation was also identified in a further family affected with parkinsonism, peripheral neuropathy and dystonia but little cerebellar disease. The origins of these 10 families were the United Kingdom, India, Pakistan, the West Indies, France, Brazil, and Ghana. The authors could find no clinical feature that distinguished ADCA type I patients with the SCA3 mutation from those who did not have it. Giunti et al. (1995) found that the CAG repeat length ranged from 13 to 41 copies on normal chromosomes and 62 to 80 copies on affected chromosomes. The families in which Giunti et al. (1995) detected the Machado-Joseph disease trinucleotide repeat expansion included the historic 'Drew family of Walworth' (Harding, 1982). </p><p>Since some clinical features of MJD overlap with those of SCA, Schols et al. (1995) sought MJD mutations in 38 German families with autosomal dominant SCA. The MJD (CAG)n trinucleotide expansion was identified in 19 families. In contrast, the trinucleotide expansion was not observed in 21 ataxia patients without a family history of the disease. Analysis of the (CAG)n repeat length in 30 patients revealed an inverse correlation with the age of onset. The (CAG)n stretch of the affected allele varied between 67 and 78 trinucleotide units; the normal alleles carried between 12 and 28 simple repeats. These results demonstrated that the MJD mutation causes the disease phenotype of most SCA patients in Germany. Schols et al. (1995) pointed out that in SCA3 as observed in Germany, features characteristic of Machado-Joseph disease, such as dystonia, bulging eyes, and faciolingual fasciculations, are rare. </p><p>Durr et al. (1996) screened 173 index patients with adult-onset cerebellar ataxia of whom 125 were classified as ADCA type I (cerebellar signs with supranuclear ophthalmoplegia, extrapyramidal signs, dementia, and amyotrophy); 9 of whom were ADCA type II (cerebellar ataxia with retinal degeneration in all family members); and 4 were ADCA type III (pure cerebellar signs after a disease duration of more than 10 years). The SCA3-MJD mutation represented 28% of all their ADCA type I families, whereas SCA1 only accounted for 13% in their population. The number of CAG repeats in the expanded allele ranged from 64 to 82 with a median of 73. In contrast, normal alleles contained between 14 and 40 CAG repeats. The mean expansion between generations was +0.86 CAG repeat units without a statistically significant difference between paternally and maternally transmitted alleles. Durr et al. (1996) found no correlation between the CAG repeat length and the tendency to expansion. All SCA3 patients had cerebellar ataxia; 46% had extensor plantar responses; 55% had decreased vibratory sensation; and supranuclear ophthalmoplegia was present in 47% of the patients. Dystonia and parkinsonian signs were only found in 18% of the patients. Two of 49 patients had retinal degeneration; 60% of patients had axonal neuropathy. Bulging eyes were noticed in 23% of SCA3 patients, which was similar to the frequency observed in SCA1 patients. </p><p>Lopes-Cendes et al. (1997) reported 25 unrelated Brazilian families with MJD. Molecular analysis showed that normal alleles ranged from 12 to 33 CAG repeats, whereas expanded pathogenic alleles ranged from 66 to 78 CAG repeats. There was a significant negative correlation between age at onset and length of CAG tract. However, repeat contractions were also detected, and Lopes-Cendes et al. (1997) estimated that only 40% of the variation in age at disease onset could be attributed to length of the expanded repeat.</p><p>Ramesar et al. (1997) investigated 14 South African kindreds and 22 sporadic individuals with SCA for expanded SCA1 (601556.0001) and MJD repeats. The authors stated that SCA1 mutations accounted for 43% of known ataxia families in the Western Cape region of South Africa. They found that expanded SCA1 and CAG repeats cosegregated with the disorder in 6 of the families, 5 of mixed ancestry and 1 Caucasian, and were also observed in a sporadic case from the indigenous Black African population. The use of the microsatellite markers D6S260, D6S89, and D6S274 provided evidence that the expanded SCA1 repeats segregated with 3 distinct haplotypes in the 6 families. None of the families nor the sporadic individuals showed expansion of the MJD repeat. </p><p>Studying 77 German families with autosomal dominant cerebellar ataxia of SCA types 1, 2, 3, and 6 (183086), Schols et al. (1997) found that the SCA1 mutation accounted for 9%, SCA2 for 10%, SCA3 for 42%, and SCA6 for 22%. There was no family history of ataxia in 7 of 27 SCA6 patients. Age at onset correlated inversely with repeat length in all subtypes. Yet the average effect of 1 CAG unit on age of onset was different for each SCA subtype. Schols et al. (1997) compared clinical, electrophysiologic, and magnetic resonance imaging (MRI) findings to identify phenotypic characteristics of genetically defined SCA subtypes. Slow saccades, hyporeflexia, myoclonus, and action tremor suggested SCA2. SCA3 patients frequently developed diplopia, severe spasticity or pronounced peripheral neuropathy, and impaired temperature discrimination, apart from ataxia. SCA6 presented with a predominantly cerebellar syndrome, and patients often had onset after 55 years of age. SCA1 was characterized by markedly prolonged peripheral and central motor conduction times in motor evoked potentials. MRI scans showed pontine and cerebellar atrophy in SCA1 and SCA2. In SCA3, enlargement of the fourth ventricle was the main sequel of atrophy. SCA6 presented with pure cerebellar atrophy on MRI. Overlap between the 4 SCA subtypes was broad, however. </p>
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<strong>Genotype/Phenotype Correlations</strong>
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<p>Kawaguchi et al. (1994) found a negative correlation between age of onset and CAG repeat numbers in MJD. Southern blot analyses and genomic cloning demonstrated the existence of related genes and raised the possibility that similar abnormalities in related genes may give rise to diseases similar to MJD. </p><p>Maruyama et al. (1995) examined the molecular features of the CAG repeats and the clinical manifestations in 90 MJD individuals from 62 independent Japanese MJD families and found that the MJD repeat length was inversely correlated with the age of onset (r = -0.87). The MJD chromosomes contained 61-84 repeat units, whereas normal chromosomes displayed 14-34 repeats. In the normal chromosomes, 14 repeat units were the most common and the shortest. </p><p>Takiyama et al. (1995) examined the size of the (CAG)n repeat array in the 3-prime end of the ATXN3 gene and the haplotype at a series of microsatellite markers surrounding the ATXN3 gene in a large cohort of Japanese and Caucasian subjects with MJD. Expansion of the array from the normal range of 14-37 repeats to 68-84 repeats was found, with no instances of expansions intermediate in size between those of the normal and MJD affected groups. The expanded allele associated with MJD displayed intergenerational instability, particularly in male meiosis, and this instability was associated with the clinical phenomenon of anticipation. The size of the expanded allele was not only inversely correlated with the age-of-onset of MJD, but was also correlated with the frequency of other clinical features, such as pseudoexophthalmos and pyramidal signs were more frequent in subjects with larger repeats. The disease phenotype was significantly more severe and had an early age of onset (16 years) in a subject homozygous for the expanded allele, which contrasts with Huntington disease (HD; 143100), in which the homozygous subject has a disorder indistinguishable from that in the heterozygous subject. The observation in MJD suggests that the expanded allele may exert its effect either by a dominant-negative effect (putatively excluded in HD) or by a gain-of-function effect as proposed for HD. Japanese and Caucasian subjects affected with MJD shared haplotypes at several markers surrounding the ATXN3 gene, these markers being uncommon in the normal Japanese and Caucasian populations, thus suggesting the existence either of common founders in these populations or of chromosomes susceptible to pathologic expansion of the CAG repeat in the ATXN3 gene. </p><p>Ranum et al. (1995) made use of the fact that the genes involved in 2 forms of autosomal dominant ataxia, that for MJD and that for SCA1, have been isolated to assess the frequency of trinucleotide repeat expansions among individuals diagnosed with ataxia. They collected and analyzed DNA from individuals with both disorders. In both cases, the genes responsible for the disorder were found to have an expansion of an unstable CAG trinucleotide repeat. These individuals represented 311 families with adult-onset ataxia of unknown etiology, of which 149 families had dominantly inherited ataxia. Ranum et al. (1995) found that of these, 3% had SCA1 trinucleotide repeat expansions, whereas 21% were positive for the MJD trinucleotide expansion. For the 57 patients with MJD trinucleotide repeat expansions, strong inverse correlation between CAG repeat size and age at onset was observed (r = -0.838). Among the MJD patients, the normal and affected ranges of CAG repeat size were 14 to 40 and 68 to 82 repeats, respectively. For SCA1, the normal and affected ranges were much closer, namely 19 to 38 and 40 to 81 CAG repeats, respectively. </p><p>Cancel et al. (1995) documented the marked phenotypic heterogeneity associated with expansion of the CAG repeat sequence at the SCA3/MJD locus. They studied 3 French families with type I autosomal dominant cerebellar ataxia and a French family with neuropathologic findings suggesting the ataxochoreic form of dentatorubropallidoluysian atrophy (DRPLA; 125370). A strong correlation was found between size of the expanded CAG repeat and age at onset of clinical disease. Instability of the expanded triplet repeat was not found to be affected by sex of the parent transmitting the mutation. Both somatic and gonadal mosaicism for alleles carrying expanded trinucleotide repeats was found. The 4 French families had no known Portuguese ancestry. Faciolingual myokymia, said to be a hallmark of MJD, increased tendon reflexes, ophthalmoplegia, and dystonia occur significantly more frequently among Azorean MJD patients, while decreased vibratory sense and dementia were found more often among the French cerebellar ataxia type I patients. Myoclonus, present in 1 of the 5 patients in the French family with the DRPLA-like disorder, had never been reported in SCA3 or MJD kindreds. </p><p>Igarashi et al. (1996) investigated the association of intergenerational instability of the expanded CAG repeat in MJD with a CAG/CAA polymorphism in the CAG repeat and a CGG/GGG polymorphism at the 3-prime end of the CAG array. Their results strongly suggested that an interallelic interaction is involved in the intergenerational instability of the expanded CAG repeat. Igarashi et al. (1996) reported that normal chromosomes with the CGG allele are more frequently associated with larger CAG repeats than normal chromosomes with the GGG allele. They also reported that 80 of 88 independent MJD chromosomes had the CGG allele, which is in striking contrast to the CGG allele frequency in the normal chromosome. Igarashi et al. (1996) investigated the effect of gender on the intergenerational instability of the expanded CAG repeat. They obtained significant evidence that the expanded CAG repeats were less stable in paternal transmission than in maternal transmission. </p><p>Size of the expanded repeat and gene dosage are factors in the severity and early onset of MJD. Another factor pointed out by Kawakami et al. (1995) is gender. In a total of 14 sib pairs, the mean of the differences in age of onset between the sibs of different sexes was 12.7 +/-1.7 (n = 7) and between the sibs of the same sex was 3.9 +/-1.7 (n = 7). The difference was statistically significant, whereas the variance in length of CAG repeats between these 2 groups was not significant. </p><p>Van Alfen et al. (2001) reported a Dutch family in which 4 members in 2 generations had intermediate repeat lengths (53 and 54) in the ATXN3 gene. All but the youngest had a restless legs syndrome with fasciculations and a sensorimotor axonal polyneuropathy. The authors concluded that intermediate repeat lengths can be pathogenic and may predispose for restless legs and peripheral nerve disorder. </p><p>Van de Warrenburg et al. (2005) applied statistical analysis to examine the relationship between age at onset and number of expanded triplet repeats from a Dutch-French cohort of 802 patients with SCA1 (138 patients), SCA2 (166 patients), SCA3 (342 patients), SCA6 (53 patients), and SCA7 (103 patients). The size of the expanded repeat explained 66 to 75% of the variance in age at onset for SCA1, SCA2, and SCA7, but less than 50% for SCA3 and SCA6. The relation between age at onset and CAG repeat was similar for all groups except for SCA2, suggesting that the polyglutamine repeat in the ataxin-2 protein exerts its pathologic effect in a different way. A contribution of the nonexpanded allele to age at onset was observed for only SCA1 and SCA6. Van de Warrenburg et al. (2005) acknowledged that their results were purely mathematical, but suggested that they reflected biologic variations among the diseases. </p><p>Padiath et al. (2005) reported a 3-generation Indian pedigree in which the proband had 45 CAG repeats in the ATXN3 gene. The proband had clinical features of spinocerebellar ataxia as well as signs of cerebellar and brainstem atrophy. The 45-repeat allele was unstable on intergenerational transmission and was associated with a haplotype found in the majority of MJD/SCA3 patients worldwide. Padiath et al. (2005) noted that this was the smallest unstable allele reported in the ATXN3 gene. </p><p>Leotti et al. (2021) analyzed CAG repeat size and progression of disease for over 15 years in 82 Dutch patients with MJD from a single medical center. The analysis included a total of 722 clinical evaluations and scores on the International Cooperative Ataxia Rating Scale. The authors found that the length of the expanded CAG repeat explained 49.39% of the age of onset variation. Across the entire cohort, the ICARS scores increased by an average of 2.57 points per year, but the patients with the largest CAG expansions (70-75 repeats) had a faster progression (3.27 points per year) than those with the shortest CAG expansions (60-66 repeats) whose ICARS scores increased at an average of 1.78 points per year. Leotti et al. (2021) calculated that the CAG repeat length explained 30% of the variation in disease progression. The CAG repeat length combined with the residual age of onset (RAO, the difference between the observed age of onset and predicted age of onset based on the expanded CAG repeat length) explained 46.9% of the ICARS progression. </p><p><strong><em>Allelic Transmission</em></strong></p><p>
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Maruyama et al. (1995) analyzed parent-child transmission in association with the clinical anticipation of the disease and showed the unidirectional expansion of CAG repeats with no case of diminution in the affected family. The differences in CAG repeat length between parent and child and between sibs were greater in paternal transmission than in maternal transmission. Detailed analysis showed that a large degree of expansion was associated with a shorter length of the ATXN3 gene in paternal transmission. On the other hand, the increments of increase were similar for shorter and longer expansions in maternal transmission. Among the 3 clinical subtypes, type 1 MJD with dystonia showed a larger degree of expansion in CAG repeats of the gene and younger ages of onset than the other types. </p><p>Ikeuchi et al. (1996) analyzed segregation patterns in 80 transmissions in 7 MJD pedigrees and in 211 transmissions in 24 DRPLA pedigrees with the diagnoses confirmed by molecular testing. The significant distortions in favor of transmission of the mutant alleles were found in male meiosis, where the mutant alleles were transmitted to 73% of all offspring in MJD (P less than 0.01) and to 62% of all offspring in DRPLA (P less than 0.01). The results were consistent with meiotic drive in these 2 disorders. The authors commented that, since more prominent meiotic instability of the length of the CAG trinucleotide repeats is observed in male meiosis than in female meiosis and meiotic drive is observed only in male meiosis, these results raised the possibility that a common molecular mechanism underlies the meiotic drive and the meiotic instability in male meiosis. </p><p>Rubinsztein and Leggo (1997) investigated the transmission of alleles with larger versus smaller CAG repeat numbers in the ATXN3 gene in normal heterozygotes from the 40 CEPH families. Their data suggested that there was no segregation distortion in male meioses, while the smaller CAG allele was inherited in 57% of female meioses (p less than 0.016). The pattern of inheritance of smaller versus larger CAG alleles at this locus was significantly different when male and female meioses were compared. While previous data suggested that meiotic drive may be a feature of certain human diseases, including the trinucleotide disease MJD, myotonic dystrophy, and DRPLA, the data of Rubinsztein and Leggo (1997) were compatible with meiotic drive also occurring among non-disease-associated CAG sizes. </p><p>In German patients with SCA3, Riess et al. (1997) likewise found transmission distortion of the mutant alleles, but the segregation distortion was observed during maternal transmission in German families, rather than in paternal inheritance, as observed in Japanese pedigrees. </p><p>Grewal et al. (1999) performed a sperm typing study of 5 MJD patients of French descent. Analysis of the pooled data showed a ratio of mutant to normal alleles of 379:436 (46.5%:53.5%). To confirm these results, sperm typing analysis was also performed using a polymorphic marker, D14S1050, closely linked to the ATXN3 gene. Among 910 sperm analyzed, the allele linked to the disease chromosome was detected in 50.3% of the samples, and the allele linked to the normal chromosome was found in 49.6% of the sperm. The difference in frequency of these 2 alleles was not significant. </p><p>In an analysis of 428 meioses among 102 healthy Portuguese sibships, Bettencourt et al. (2008) observed preferential transmission of the smaller ATXN3 wildtype allele. There were no mutational events. There was a positive correlation between the difference in length between the 2 ATXN3 alleles of the transmitter's genotype and the frequency of transmission of the smaller alleles. The authors concluded that the genotypic composition of the transmitters in a sample should be taken into account in studies of segregation ratio distortion. </p><p>In a large population-based study of 82 MJD families from Rio Grande do Sul, Brazil, Prestes et al. (2008) found that fitness among affected individuals was increased compared to the general population and compared to unaffected family members. Affected individuals had significantly more children than unaffected relatives, with no sign of parental gender effect. In addition, affected individuals had a lower age at first delivery and earlier onset of menopause compared to unaffected relatives; however, affected women who did not have children had larger CAG tracts than those who had children. Prestes et al. (2008) noted that since disease onset usually occurs after reproductive age, most affected individuals have children before knowing their genetic status. The findings overall suggested enhanced fitness of the mutant allele. </p>
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<strong>Pathogenesis</strong>
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<p>Ikeda et al. (1996) demonstrated the induction of apoptosis in cultured cells expressing a portion of the ATXN3 gene that included the expanded CAG repeats. Cell death occurred only when the CAG repeat was translated into polyglutamine residues, which apparently precipitated in large covalently modified forms. Sisodia (1998) reviewed the significance of nuclear inclusions in glutamine repeat disorders. </p><p>Studying the link between intranuclear expression of expanded polyglutamine and neuronal dysfunction, Perez et al. (1999) demonstrated that ataxin-3 adopts a unique conformation when expressed within the nucleus of transfected cells. They found that this novel conformation of intranuclear ataxin-3 is not due to proteolysis, suggesting instead that association with nuclear protein(s) alters the structure of full-length ataxin-3, exposing the polyglutamine domain. This conformationally altered ataxin-3 was bound to the nuclear matrix. The pathologic form of ataxin-3 with an expanded polyglutamine domain also associates with the nuclear matrix. These data suggested that an early event in the pathogenesis of SCA3/MJD may be an altered conformation of ataxin-3 within the nucleus that exposes the polyglutamine domain. </p><p>Chai et al. (1999) presented 2 lines of evidence implicating the ubiquitin-proteasome pathway in the pathogenesis of SCA3/MJD. First, studies of both human disease tissue and in vitro models showed redistribution of the 26S proteasome complex into polyglutamine aggregates. In neurons from SCA3/MJD brain, the proteasome localized to intranuclear inclusions containing the mutant protein ataxin-3. In transfected cells, the proteasome redistributed into inclusions formed by 3 expanded polyglutamine proteins: a pathologic ataxin-3 fragment, full-length mutant ataxin-3, and an unrelated GFP-polyglutamine fusion protein. Inclusion formation by the full-length mutant ataxin-3 required nuclear localization of the protein and occurred within specific subnuclear structures recently implicated in the regulation of cell death. In a second set of experiments, inhibitors of the proteasome caused a repeat length-dependent increase in aggregate formation, implying that the proteasome plays a direct role in suppressing polyglutamine aggregation in disease. These results supported a central role for protein misfolding in the pathogenesis of SCA3/MJD and suggested that modulating proteasome activity is a potential approach to altering the progression of this and other polyglutamine diseases. </p><p>Evert et al. (1999) generated ataxin-3-expressing rat mesencephalic CSM14.1 cells to study the effects of long-term expression of ataxin-3. The isolated stable cell lines provided high level expression of human full-length ataxin-3 with either the normal nonexpanded CAG repeats (SCA3-Q23) or the pathogenic expanded CAG repeats (SCA3-Q70). When cultured at a nonpermissive temperature (39 degrees C), CSM14.1 cells expressing the expanded full-length ataxin-3 developed nuclear inclusion bodies, strong indentations of the nuclear envelope, and cytoplasmic vacuolation, whereas cells expressing the nonexpanded form and control cells did not. The ultrastructural alterations resembled those found in affected neurons of SCA3 patients. Cells with such changes exhibited increased spontaneous nonapoptotic cell death. </p><p>Gaspar et al. (2000) explored the possibility that frameshift mutations in expanded CAG tracts of ATXN3 can generate polyalanine mutant proteins and form intranuclear inclusions. Antisera were raised against a synthetic peptide corresponding to the C terminus of ATXN3, which would result from a frameshift within the CAG repeat motif with an intervening polyalanine stretch. Corresponding proteins were evident in MJD patients by Western blot analysis of lymphoblastoid proteins and in situ hybridization of MJD pontine neurons. Transfection experiments suggested that frameshifts are more likely to occur in longer CAG repeats and that alanine polymers alone may be harmful to cells. The authors suggested that a similar pathogenic mechanism may occur in other CAG repeat disorders. </p><p>Ishikawa et al. (2002) reported 4 patients with MJD, confirmed by expanded CAG repeat in the ATXN3 gene, who had symptoms of dementia and delirium. The common features of the patients, 2 of whom were sibs, were relatively early age of onset (16-36 years), long latency to the occurrence of dementia and delirium (13-25 years), and much longer CAG repeat lengths (74-79) compared with the mean repeat length found in patients with MJD. Abnormal mental activity began after age 40 and consisted of abnormal episodes of crying, excitation, delusion, disorientation, and inappropriate behavior, suggesting a delirious state. Dementia followed soon after. Pathologic examination of 2 patients showed cerebrocortical and thalamic neuronal intranuclear inclusions that stained with an antipolyglutamine antibody. Ishikawa et al. (2002) suggested that symptoms of delirium and dementia may occur in late stages of MJD, particularly in those with longer expanded repeats, and may be caused by dysfunction of cerebrocortical neurons. </p><p>Toulouse et al. (2005) established a cellular model of transcript frameshifting of expanded CAG tracts, resulting from ribosomal slippage to the -1 frame exclusively. Ribosomal frameshifting depended on the presence of long CAG tracts, and polyalanine-frameshifted proteins may enhance polyglutamine-associated toxicity, possibly contributing to pathogenesis. Anisomycin, a ribosome-interacting drug that reduces -1 frameshifting, also reduced toxicity, suggesting a therapeutic opportunity for these disorders. </p><p>Haacke et al. (2006) found that full-length recombinant human AT3 formed detergent-resistant fibrillar aggregates in vitro with extremely low efficiency, even when it contained a pathogenic polyQ tract of 71 residues (AT3Q71). However, an N-terminally truncated form, called 257cQ71, which began with residue 257 and contained only the C terminus with an expanded polyQ region, readily formed detergent-insoluble aggregates and recruited full-length nonpathogenic AT3Q22 into the aggregates. The efficiency of recruitment increased with expansion of the polyQ stretch. FRET analysis revealed that the interaction of AT3Q22 with the polyQ tract of 257cQ71 caused a conformational change that affected the active-site cysteine within the Josephin domain of AT3Q22. Similar results were found in vivo with transfected mouse neuroblastoma cells: 257cQ71 formed inclusions in almost all cells, and full-length AT3 proteins did not readily aggregate unless coexpressed with 257cQ71. AT3Q71 also formed inclusions, but it appeared to do so following its partial degradation. Use of an engineered protease-sensitive form of AT3 suggested that release of expanded polyQ fragments initiates the formation of cellular inclusions. Haacke et al. (2006) concluded that recruitment of functional AT3 into aggregates by expanded polyQ-containing fragments reduces cellular AT3 content and thus impairs its function. </p><p>Reina et al. (2010) showed that interactions of ATXN3 with valosin-containing protein (VCP; 601023) and HHR23B (RAD23B; 600062) were dynamic and modulated by proteotoxic stresses. Heat shock, a general proteotoxic stress, also induced wildtype and pathogenic ATXN3 to accumulate in the nucleus. Mapping studies showed that 2 regions of ATXN3, the Josephin domain and the C terminus, regulated heat shock-induced nuclear localization. Atxn3-null mouse cells were more sensitive to toxic effects of heat shock, suggesting that ATXN3 had a protective function in the cellular response to heat shock. Oxidative stress also induced nuclear localization of ATXN3; both wildtype and pathogenic ATXN3 accumulated in the nucleus of SCA3 patient fibroblasts following oxidative stress. Heat shock and oxidative stress were the first processes identified that increased nuclear localization of ATXN3. Reina et al. (2010) suggested that the nucleus may be a key site for early pathogenesis of SCA3. </p><p>Koch et al. (2011) showed that L-glutamate-induced excitation of patient-specific induced pluripotent stem cell (iPSC)-derived neurons initiates calcium-dependent proteolysis of ATXN3 followed by the formation of SDS-insoluble aggregates. This phenotype could be abolished by calpain (see 114220) inhibition, confirming a key role of this protease in ATXN3 aggregation. Aggregate formation was further dependent on functional sodium and potassium channels as well as ionotropic and voltage-gated calcium channels, and was not observed in iPSCs, fibroblasts, or glia, thereby providing an explanation for the neuron-specific phenotype of Machado-Joseph disease. Koch et al. (2011) concluded that iPSCs enable the study of aberrant protein processing associated with late-onset neurodegenerative disorders in patient-specific neurons. </p>
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<strong>Population Genetics</strong>
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<p>With the cloning of the ATXN3 gene and the firm identification of the disorder in many populations, the hypothesis was raised that the present world distribution of the disorder could have resulted from the spread of an original founder mutation. Stevanin et al. (1995) reported strong linkage disequilibrium of MJD chromosomes at the AFM343vf1 locus and found a common haplotype that is frequently shared by Japanese and Azorean MJD chromosomes, which suggests a founder effect or the presence of predisposing chromosomes prone to expansions of the CAG repeat. </p><p>Lima et al. (1998) studied the genealogies of 32 Azorean families containing a total of 103 patients with Machado-Joseph disease, using parish records as the main source of data. These patients were originally from the islands of Sao Miguel, Terceira, Graciosa, and Flores. The genealogies of the 2 main Azorean American families, by the names of Machado and Joseph, were also reconstructed. The family from Terceira was linked to 3 different MJD families from Flores through common ancestors. No kinship was observed, however, between the MJD families from Sao Miguel and families from any other island. The chronologic and geographic distribution indicated that more than one MJD mutation was introduced in the Azores, probably by settlers coming from the Portuguese mainland. The molecular evidence corroborated these results, because 2 distinct haplotypes had been established, one on the island of Sao Miguel and the other on Flores. </p><p>Among 202 Japanese and 177 Caucasian families with autosomal dominant SCA, Takano et al. (1998) found that the prevalence of SCA3 was significantly higher in the Japanese population (43%) compared to the Caucasian population (30%). This corresponded to higher frequencies of large normal ATXN3 CAG repeat alleles (greater than 27 repeats) in Japanese controls compared to Caucasian controls. The findings suggested that large normal alleles contribute to the generation of expanded alleles that lead to dominant SCA. </p><p>Gaspar et al. (2001) analyzed linkage-disequilibrium of tightly linked polymorphisms and by haplotype comparison in 249 families from different countries. They typed 5 microsatellite markers surrounding the MJD locus and 3 intragenic single-basepair polymorphisms. The results showed 2 different haplotypes, specific to the island of origin, in families of Azorean extraction. In families from mainland Portugal, both Azorean haplotypes could be found. The majority of non-Portuguese families also shared the same intragenic ACA haplotype seen in the families coming from the island of Flores, but at least 3 other haplotypes were seen. These findings suggested 2 introductions of the mutation into the Portuguese population. Worldwide, the sharing of the intragenic ACA haplotype by most families studied supports a founder mutation in MJD. </p><p>Mittal et al. (2005) identified the common ACA haplotype in 9 Indian families with MJD. This haplotype was also significantly associated with large normal alleles (greater than 26 repeats) in unaffected Indian individuals. The authors suggested that the pathogenic expanded alleles may have originated from the pool of large normal alleles in this population, possibly via a gene conversion event. The findings were consistent with historical evidence related to Moorish sea trade and to maritime links between Portugal and South Asia. </p><p>In a nationwide survey of Japanese patients, Hirayama et al. (1994) estimated the prevalence of all forms of spinocerebellar degeneration to be 4.53 per 100,000; of these, 2% were thought to have Machado-Joseph disease. Watanabe et al. (1998) investigated 101 kindreds with spinocerebellar ataxias from the central Honshu island of Japan, using a molecular diagnostic approach with amplification of the CAG trinucleotide repeat of the causative genes. Machado-Joseph disease was the most common form, accounting for 33.7% of cases. </p><p>Storey et al. (2000) examined the frequency of mutations for SCA types 1, 2, 3, 6, and 7 (164500) in southeastern Australia. Of 63 pedigrees or individuals with positive tests, 30% had SCA1, 15% had SCA2, 22% had SCA3, 30% had SCA6, and 3% had SCA7. Ethnic origin was of importance in determining SCA type: 4 of 9 SCA2 index cases were of Italian origin, and 4 of 14 SCA3 index cases were of Chinese origin. </p><p>In 110 unrelated Portuguese and Brazilian families with spinocerebellar ataxia due to a trinucleotide repeat expansion, Silveira et al. (2002) found that 63% of dominantly inherited cases had an expansion in the ATXN3 gene. Other tested loci included SCA2 (3%), DRPLA (2%), SCA6 (1%), SCA7 (1%), and SCA8 (2%). </p><p>Van de Warrenburg et al. (2002) surveyed information from Dutch diagnostic laboratories and determined that the minimal prevalence of ADCA in the Netherlands was 3 per 100,000 (range, 2.8-3.8/100,000). Of 145 ADCA families, 44.1% had SCA3, 23.5% had SCA6, 11.7% had SCA7, 11.0% had SCA2, and 9.7% had SCA1. CAG repeat length contributed to 52 to 76% of age of onset variance, with similar regression slopes for SCA1, SCA2, SCA3, and SCA7, which the authors suggested may reflect a similar mechanism of polyglutamine-induced neurotoxicity in these diseases. </p><p>By haplotype analysis of 21 Dutch SCA3 families confirmed by genotype, Verbeek et al. (2004) observed a highly conserved 1.4-Mb core genomic region between markers D14S995 and D14S973 in 17 families. The 4 remaining families had a truncated form of this haplotype. Genealogic research was able to link 10 SCA3 families into 4 clusters. Families with a 6 allele at marker D14S617 were clustered in the eastern part of the Netherlands (province of Drenthe) and those with a 7 allele at marker D14S617 were clustered in the western part (province of South Holland). The findings implicated 1 major founder SCA3 mutation in the Dutch population. Similar results were found for SCA6. </p><p>Zhao et al. (2002) reported the prevalence and ethnic differences of ADCA in Singapore. Among 204 patients with ataxia who underwent genetic testing for 9 types, 58 (28.4%) from 36 families tested positive. SCA3 was identified in 31 (53.4%) patients from 15 families, SCA2 in 17 (29.3%) patients from 12 families, and SCA1 in 4 (6.9%) patients from 4 families. SCA2 was the only subtype identified among ethnic Malay and ethnic Indian families. </p><p>Of 253 unrelated Korean patients with progressive cerebellar ataxia, Lee et al. (2003) identified 52 (20.6%) with expanded CAG repeats. The most frequent SCA type was SCA2 (33%), followed by SCA3 (29%), SCA6 (19%), SCA1 (12%), and SCA7 (8%). There were characteristic clinical features, such as hypotonia and optic atrophy for SCA1, hyporeflexia for SCA2, nystagmus, bulging eye, and dystonia for SCA3, and macular degeneration for SCA7. </p><p>Shimizu et al. (2004) estimated the prevalence of SCA in the Nagano prefecture of Japan to be at least 22 per 100,000. Thirty-one of 86 families (36%) were positive for SCA disease-causing repeat expansions: SCA6 was the most common form (19%), followed by DRPLA (10%), SCA3 (3%), SCA1 (2%), and SCA2 (1%). The authors noted that the prevalence of SCA3 was lower compared to other regions in Japan, and that the number of genetically undetermined SCA families in Nagano was much higher than in other regions. Nagano is the central district of the main island of Japan, located in a mountainous area surrounded by the Japanese Alps. The restricted geography suggested that founder effects may have contributed to the high frequency of genetically undetermined ADCA families. </p><p>Among 114 Brazilian families with autosomal dominant SCA, Trott et al. (2006) found that SCA3 was the most common form, present in 94 (84%) families. </p><p>Among 113 Japanese families from the island of Hokkaido with autosomal dominant SCA, Basri et al. (2007) found that SCA6 was the most common form of the disorder, identified in 35 (31%) families. Thirty (27%) families had SCA3, 11 (10%) had SCA1, 5 (4%) had SCA2, 5 (4%) had DRPLA, 10 (9%) had 16q22-linked SCA (117210), and 1 (1%) had SCA14 (605361). The specific disorder could not be identified in 16 (14%) families. </p><p>Prestes et al. (2008) found a prevalence of 3.5 per 100,000 individuals for MJD in the state of Rio Grande do Sul, Brazil. </p><p>Sura et al. (2009) reported that SCA3 was the most common type of SCA in Thailand, occurring in 35 (19.2%) of 182 probands and 74 (22%) of 340 total patients. SCA1 and SCA2 were found in 11.5% and 10.4% of probands, respectively. SCA3 frequency was less than that found in Chinese studies, but more than that of most Indian studies. </p>
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<strong>History</strong>
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<p>Pierre Marie (1893), professor and head of the Department of Neurology at Paris Medical School, proposed the designation 'l'heredo-ataxie cerebelleuse' (HAC) to describe a hereditary cerebellar disorder diagnosed in the Haudebourg family reported by Klippel and Durante (1892). The last patient from the Haudebourg family was reported by Guillain et al. (1941). In a reappraisal based on original handwritten reports and pathology slides of the last case labeled with the diagnosis of HAC, whose autopsy was recorded on October 15, 1943, and whose clinicopathologic features were identical to those of patients from the Haudebourg family, Uchihara et al. (2004) concluded that HAC is consistent with Machado-Joseph disease. </p>
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<strong>Animal Model</strong>
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<p>Ikeda et al. (1996) created ataxic transgenic mice by expressing the expanded polyglutamine stretch in Purkinje cells. The results demonstrated the potential involvement of expanded polyglutamine regions as the common etiologic agent for inherited neurodegenerative diseases with CAG expansions. </p><p>Warrick et al. (1998) recreated this glutamine-repeat disease in Drosophila using a segment of the SCA3/MJD protein. Targeted expression of the protein with an expanded polyglutamine repeat led to nuclear inclusion formation and late-onset cell degeneration. Differential sensitivity to the mutant transgene was observed among different cell types, with neurons being particularly susceptible. Nuclear inclusion formation alone was not sufficient for degeneration. These results demonstrated that cellular mechanisms of human glutamine-repeat disease are conserved in invertebrates. This fly model is useful in identifying additional factors that modulate neurodegeneration. </p><p>Data indicate that molecular chaperones can modulate polyglutamine pathogenesis. To elucidate the basis of polyglutamine toxicity and the mechanism by which chaperones suppress neurodegeneration, Chan et al. (2000) studied transgenic Drosophila disease models of MJD and Huntington disease (143100). They demonstrated that Hsp70 (see 140559) and Hdj1, the Drosophila homolog of human DNAJB1 (604572), showed substrate specificity for polyglutamine proteins as well as synergy in suppression of neurotoxicity, and altered the solubility properties of the mutant polyglutamine protein. </p><p>By comparing previously reported genetic modifiers in 3 Drosophila models of human neurodegenerative disease, Ghosh and Feany (2004) confirmed that protein folding, histone acetylation, and apoptosis are common features of neurotoxicity. Two novel genetic modifiers, the Drosophila homolog of ATXN2 (601517) and CGI7231, were identified. Cell-type specificity was demonstrated as many, but not all, retinal modifiers also modified toxicity in postmitotic neurons. Ghosh and Feany (2004) identified nicotinamide, which has histone deacetylase-inhibiting activity, as a potent suppressor of polyglutamine toxicity. </p><p>Jung and Bonini (2007) showed that the Drosophila model for the CAG/polyglutamine disease spinocerebellar ataxia type-3 (Warrick et al., 1998) recapitulates key features of human CAG repeat instability, including large repeat changes and strong expansion bias. Instability is dramatically enhanced by transcription and modulated by nuclear excision repair and CREB-binding protein (600140), a histone acetyltransferase whose decreased activity contributes to polyglutamine disease. Pharmacologic treatment normalizes acetylation-suppressed instability. Thus, Jung and Bonini (2007) concluded that toxic consequences of pathogenic polyglutamine protein may include enhancing repeat instability. </p><p>Alves et al. (2008) used a lentivirus to overexpress expanded human ataxin-3 (72Q repeats) in specific areas of rat brain. In the substantia nigra, mutant ataxin-3 was found in punctate and mainly nuclear aggregates, colocalized with ubiquitin (UBB; 191339) and alpha-synuclein (SNCA; 163890), reminiscent of Parkinson disease (168600), and depleted TH (191290)-positive neurons. Animals with injection in the substantia nigra developed motor deficits, including rotational asymmetry. These findings were not observed in response to injection of wildtype ataxin-3. Injection of expanded ataxin-3 in the striatum resulted in dose- and time-dependent neuropathology, including intranuclear aggregation of ubiquitinated mutant ataxin-3 and condensation of cell nuclei. Striatal tissue from 3 human MJD patients showed similar neuropathology, indicating that striatal dysfunction is involved in disease pathogenesis. In mice, injection of mutant ataxin-3 in the cerebral cortex resulted in some aggregation, but did not result in major neuropathologic changes. </p><p>Boy et al. (2009) generated a conditional mouse model of SCA3. Transgenic mice developed a progressive neurologic phenotype characterized by neuronal dysfunction in the cerebellum, reduced anxiety, hyperactivity, impaired performance on the rotarod test, and lower body weight gain. When mutant ataxin-3 expression was turned off in symptomatic mice in an early disease state, the transgenic mice were indistinguishable from negative controls after 5 months of treatment. Boy et al. (2009) concluded that reducing the production of pathogenic ataxin-3 may be a promising approach to treat SCA3, provided that such treatment is applied before irreversible damage has taken place and that it is continued for a sufficiently long time. </p><p>Alves et al. (2010) both overexpressed and silenced wildtype ATX3 in the rat model of MJD developed by Alves et al. (2008). They found that overexpression of wildtype ATX3 did not protect against MJD pathology, that knockdown of wildtype ATX3 did not aggravate MJD pathology, and that non-allele-specific silencing of ataxin-3 strongly reduced neuropathology. </p><p>In a small molecule screen of FDA-approved drugs, Teixeira-Castro et al. (2015) found that citalopram, a selective serotonin reuptake inhibitor (SSRI) that targets 5HT receptors, rescued neuronal dysfunction, reduced toxic Atxn3 aggregation, and improved locomotion defects in animal models of mutant Atnx3-induced neurotoxicity in C. elegans. Similar results were also obtained with mutant mice. Postmortem examination of the animals suggested that citalopram affected folding and stability of Atxn3 rather than clearance of the mutant protein. </p>
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<div>
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<h4>
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<span class="mim-font">
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<span class="mim-text-font">
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Araki et al. (1980); Boyer et al. (1962); Chazot et al. (1983);
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Dawson (1977); Rosenberg and Fowler (1981); Sachdev et al. (1982);
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Sequeiros et al. (1984); Suite et al. (1986)
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
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Hilary J. Vernon - updated : 02/26/2021<br>Cassandra L. Kniffin - updated : 5/31/2016<br>Cassandra L. Kniffin - updated : 3/24/2016<br>George E. Tiller - updated : 8/5/2013<br>Cassandra L. Kniffin - updated : 3/19/2012<br>Ada Hamosh - updated : 2/7/2012<br>George E. Tiller - updated : 12/29/2010<br>Cassandra L. Kniffin - updated : 8/3/2010<br>Patricia A. Hartz - updated : 11/16/2009<br>Cassandra L. Kniffin - updated : 8/27/2009<br>Cassandra L. Kniffin - updated : 6/23/2009<br>Cassandra L. Kniffin - updated : 3/18/2009<br>Cassandra L. Kniffin - updated : 1/5/2009<br>George E. Tiller - updated : 12/9/2008<br>Cassandra L. Kniffin - updated : 10/6/2008<br>Cassandra L. Kniffin - updated : 7/7/2008<br>Cassandra L. Kniffin - updated : 3/31/2008<br>Cassandra L. Kniffin - updated : 3/6/2008<br>Cassandra L. Kniffin - updated : 1/14/2008<br>Ada Hamosh - updated : 4/13/2007<br>George E. Tiller - updated : 3/21/2007<br>Cassandra L. Kniffin - updated : 9/18/2006<br>Cassandra L. Kniffin - updated : 8/22/2005<br>John Logan Black, III - updated : 7/22/2005<br>Cassandra L. Kniffin - updated : 6/2/2005<br>Cassandra L. Kniffin - updated : 5/18/2005<br>Cassandra L. Kniffin - updated : 4/19/2005<br>Cassandra L. Kniffin - updated : 12/15/2004<br>Cassandra L. Kniffin - updated : 7/27/2004<br>Cassandra L. Kniffin - updated : 7/12/2004<br>Cassandra L. Kniffin - updated : 5/25/2004<br>Cassandra L. Kniffin - updated : 8/7/2003<br>Cassandra L. Kniffin - updated : 2/12/2003<br>Victor A. McKusick - updated : 12/26/2002<br>Cassandra L. Kniffin - updated : 12/6/2002<br>Cassandra L. Kniffin - updated : 9/4/2002<br>Cassandra L. Kniffin - updated : 8/15/2002<br>Cassandra L. Kniffin - reorganized : 6/21/2002<br>Cassandra L. Kniffin - updated : 6/17/2002<br>Victor A. McKusick - updated : 12/21/2001<br>Victor A. McKusick - updated : 7/18/2001<br>Victor A. McKusick - updated : 3/8/2001<br>George E. Tiller - updated : 2/5/2001<br>Sonja A. Rasmussen - updated : 1/9/2001<br>George E. Tiller - updated : 11/20/2000<br>George E. Tiller - updated : 10/25/2000<br>Victor A. McKusick - updated : 1/14/2000<br>Victor A. McKusick - updated : 12/9/1999<br>Victor A. McKusick - updated : 10/13/1999<br>Wilson H. Y. Lo - updated : 9/21/1999<br>Victor A. McKusick - updated : 9/15/1999<br>Wilson H. Y. Lo - updated : 8/10/1999<br>Victor A. McKusick - updated : 5/13/1999<br>Patti M. Sherman - updated : 3/8/1999<br>Victor A. McKusick - updated : 2/3/1999<br>Stylianos E. Antonarakis - updated : 10/8/1998<br>Stylianos E. Antonarakis - updated : 7/14/1998<br>Victor A. McKusick - updated : 5/12/1998<br>Ethylin Wang Jabs - updated : 7/21/1997<br>Victor A. McKusick - edited : 5/29/1997<br>Victor A. McKusick - updated : 4/21/1997<br>Victor A. McKusick - updated : 2/19/1997<br>Moyra Smith - updated : 8/15/1996<br>Orest Hurko - updated : 3/27/1996<br>Moyra Smith - updated : 3/26/1996
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Creation Date:
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Victor A. McKusick : 6/16/1986
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carol : 11/29/2023<br>alopez : 06/22/2022<br>carol : 05/02/2022<br>carol : 02/26/2021<br>carol : 05/22/2018<br>alopez : 05/21/2018<br>carol : 06/03/2016<br>carol : 6/2/2016<br>carol : 6/1/2016<br>ckniffin : 5/31/2016<br>carol : 3/25/2016<br>ckniffin : 3/24/2016<br>alopez : 8/5/2013<br>carol : 7/26/2013<br>carol : 3/20/2012<br>ckniffin : 3/19/2012<br>alopez : 2/8/2012<br>terry : 2/7/2012<br>alopez : 9/22/2011<br>wwang : 1/11/2011<br>terry : 12/29/2010<br>carol : 12/21/2010<br>ckniffin : 11/16/2010<br>wwang : 10/21/2010<br>wwang : 8/4/2010<br>ckniffin : 8/3/2010<br>mgross : 11/16/2009<br>wwang : 9/29/2009<br>ckniffin : 8/27/2009<br>wwang : 6/26/2009<br>ckniffin : 6/23/2009<br>wwang : 3/24/2009<br>ckniffin : 3/18/2009<br>wwang : 1/14/2009<br>ckniffin : 1/5/2009<br>wwang : 12/9/2008<br>carol : 12/2/2008<br>wwang : 10/16/2008<br>ckniffin : 10/6/2008<br>wwang : 7/10/2008<br>ckniffin : 7/7/2008<br>wwang : 4/7/2008<br>ckniffin : 3/31/2008<br>wwang : 3/19/2008<br>ckniffin : 3/6/2008<br>carol : 1/21/2008<br>ckniffin : 1/14/2008<br>carol : 8/17/2007<br>alopez : 4/13/2007<br>wwang : 3/22/2007<br>terry : 3/21/2007<br>wwang : 9/22/2006<br>ckniffin : 9/18/2006<br>wwang : 11/14/2005<br>ckniffin : 11/3/2005<br>wwang : 8/29/2005<br>ckniffin : 8/22/2005<br>carol : 7/25/2005<br>terry : 7/22/2005<br>wwang : 6/15/2005<br>wwang : 6/13/2005<br>ckniffin : 6/2/2005<br>wwang : 6/1/2005<br>wwang : 5/26/2005<br>ckniffin : 5/18/2005<br>tkritzer : 5/9/2005<br>ckniffin : 4/19/2005<br>tkritzer : 12/15/2004<br>ckniffin : 12/15/2004<br>tkritzer : 11/8/2004<br>tkritzer : 7/28/2004<br>ckniffin : 7/27/2004<br>tkritzer : 7/13/2004<br>ckniffin : 7/12/2004<br>tkritzer : 5/27/2004<br>ckniffin : 5/25/2004<br>tkritzer : 1/28/2004<br>ckniffin : 1/21/2004<br>tkritzer : 8/13/2003<br>ckniffin : 8/7/2003<br>carol : 2/25/2003<br>ckniffin : 2/12/2003<br>tkritzer : 12/27/2002<br>terry : 12/26/2002<br>carol : 12/16/2002<br>tkritzer : 12/16/2002<br>ckniffin : 12/6/2002<br>carol : 9/10/2002<br>ckniffin : 9/4/2002<br>carol : 8/22/2002<br>ckniffin : 8/22/2002<br>ckniffin : 8/15/2002<br>carol : 6/21/2002<br>ckniffin : 6/21/2002<br>ckniffin : 6/20/2002<br>carol : 6/17/2002<br>ckniffin : 6/17/2002<br>cwells : 5/29/2002<br>terry : 12/21/2001<br>mcapotos : 8/9/2001<br>terry : 7/18/2001<br>mcapotos : 3/20/2001<br>mcapotos : 3/16/2001<br>terry : 3/8/2001<br>cwells : 2/5/2001<br>cwells : 2/5/2001<br>cwells : 2/5/2001<br>cwells : 1/31/2001<br>mcapotos : 1/9/2001<br>mcapotos : 1/9/2001<br>mcapotos : 11/20/2000<br>mcapotos : 11/10/2000<br>mcapotos : 11/1/2000<br>mcapotos : 10/25/2000<br>mcapotos : 1/28/2000<br>terry : 1/14/2000<br>mgross : 12/13/1999<br>terry : 12/9/1999<br>mgross : 10/18/1999<br>terry : 10/13/1999<br>carol : 9/21/1999<br>mgross : 9/21/1999<br>mgross : 9/16/1999<br>terry : 9/15/1999<br>carol : 8/10/1999<br>mgross : 5/27/1999<br>mgross : 5/20/1999<br>terry : 5/13/1999<br>carol : 3/9/1999<br>psherman : 3/8/1999<br>psherman : 3/8/1999<br>carol : 2/11/1999<br>terry : 2/3/1999<br>carol : 12/3/1998<br>carol : 10/8/1998<br>dkim : 9/11/1998<br>carol : 7/14/1998<br>carol : 5/19/1998<br>joanna : 5/13/1998<br>carol : 5/12/1998<br>terry : 4/7/1998<br>alopez : 3/27/1998<br>terry : 3/25/1998<br>mark : 9/3/1997<br>terry : 9/2/1997<br>mark : 8/1/1997<br>mark : 8/1/1997<br>mark : 7/31/1997<br>alopez : 7/30/1997<br>alopez : 7/9/1997<br>joanna : 5/29/1997<br>alopez : 4/21/1997<br>alopez : 4/17/1997<br>alopez : 4/17/1997<br>terry : 4/11/1997<br>mark : 2/19/1997<br>terry : 2/11/1997<br>terry : 8/15/1996<br>mark : 8/15/1996<br>mark : 8/8/1996<br>mark : 7/22/1996<br>mark : 5/31/1996<br>terry : 5/29/1996<br>mark : 4/27/1996<br>terry : 4/19/1996<br>terry : 4/15/1996<br>mark : 3/27/1996<br>mark : 3/26/1996<br>terry : 3/19/1996<br>mark : 10/19/1995<br>carol : 12/5/1994<br>terry : 7/28/1994<br>jason : 7/1/1994<br>davew : 6/8/1994<br>mimadm : 4/14/1994
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