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<title>
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Entry
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- #204300 - CEROID LIPOFUSCINOSIS, NEURONAL, 6B (KUFS TYPE); CLN6B
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- OMIM
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<span class="h4">#204300</span>
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<a href="#phenotypeMap"><strong>Phenotype-Gene Relationships</strong></a>
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<a href="/phenotypicSeries/PS256730"> <strong>Phenotypic Series</strong> </a>
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<a href="#description">Description</a>
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<a href="#nomenclature">Nomenclature</a>
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<a href="#clinicalFeatures">Clinical Features</a>
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<a href="#inheritance">Inheritance</a>
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<a href="#molecularGenetics">Molecular Genetics</a>
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<a href="#seeAlso"><strong>See Also</strong></a>
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<li role="presentation">
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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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<div><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=19114&Typ=Pat" class="mim-tip-hint" title="A list of European laboratories that offer genetic testing." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">EuroGentest</a></div>
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<div><a href="https://www.diseaseinfosearch.org/x/1254" 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://www.ncbi.nlm.nih.gov/gtr/all/tests/?term=204300[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="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=228363" class="mim-tip-hint" title="European reference portal for information on rare diseases and orphan drugs." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">OrphaNet</a></div>
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<span id="mimVariationLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5">►</span> Variation
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<div><a href="http://www.ucl.ac.uk/ncl/" class="mim-tip-hint" title="A gene-specific database of variation." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Locus Specific DB', 'domain': 'locus-specific-db.org'})">Locus Specific DBs</a></div>
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<div class="panel panel-default" style="margin-top: 0px; border-radius: 0px">
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<div class="panel-heading mim-panel-heading" role="tab" id="mimAnimalModels">
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</span>
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<div><a href="https://www.alliancegenome.org/disease/DOID:0110730" 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/204300" 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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<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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<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>ORPHA:</strong> 228363<br />
|
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<strong>DO:</strong> 0110730<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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204300
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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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CEROID LIPOFUSCINOSIS, NEURONAL, 6B (KUFS TYPE); CLN6B
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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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<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/15/326?start=-3&limit=10&highlight=326">
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15q23
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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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Ceroid lipofuscinosis, neuronal, 6B (Kufs type)
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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/204300"> 204300 </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 recessive">AR</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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CLN6
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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/606725"> 606725 </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/204300" class="btn btn-warning" role="button"> Clinical Synopsis </a>
|
|
<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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|
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<a href="/phenotypicSeries/PS256730" 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')">
|
|
<span class="caret"></span>
|
|
<span class="sr-only">Toggle Dropdown</span>
|
|
</button>
|
|
</div>
|
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<div class="btn-group">
|
|
<button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
|
|
PheneGene Graphics <span class="caret"></span>
|
|
</button>
|
|
<ul class="dropdown-menu" style="width: 17em;">
|
|
<li><a href="/graph/linear/204300" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
|
|
<li><a href="/graph/radial/204300" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Radial'})"> Radial </a></li>
|
|
</ul>
|
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</div>
|
|
<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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|
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<div id="mimClinicalSynopsisFold" class="well well-sm collapse mimSingletonToggleFold">
|
|
<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">
|
|
<strong> INHERITANCE </strong>
|
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</span>
|
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</div>
|
|
<div style="margin-left: 2em;">
|
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<div>
|
|
<span class="mim-font">
|
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|
|
- Autosomal recessive <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/258211005" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">258211005</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0441748&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0441748</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000007</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000007</a>]</span><br />
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|
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</span>
|
|
</div>
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</div>
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</div>
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<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<strong> NEUROLOGIC </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<em> Central Nervous System </em>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Seizures <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/91175000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">91175000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0036572&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0036572</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001250" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001250</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001250" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001250</a>]</span><br /> -
|
|
Cerebellar ataxia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/85102008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">85102008</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0007758&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0007758</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001251" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001251</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001251" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001251</a>]</span><br /> -
|
|
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 /> -
|
|
Myoclonus <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/17450006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">17450006</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/G25.3" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">G25.3</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/333.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">333.2</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0027066&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0027066</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001336" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001336</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001336" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001336</a>]</span><br /> -
|
|
Dementia <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 /> -
|
|
Cerebral atrophy <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/278849000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">278849000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0235946&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0235946</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002059" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002059</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002059" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002059</a>]</span><br /> -
|
|
Autofluorescent lipopigment in neurons <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1864678&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1864678</a>]</span><br /> -
|
|
Leukoencephalopathy on CT and MRI <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1859832&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1859832</a>]</span><br />
|
|
|
|
</span>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<em> Behavioral Psychiatric Manifestations </em>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Behavioral changes <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/315244000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">315244000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0542299&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0542299</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000708" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000708</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000708" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000708</a>]</span><br /> -
|
|
Depression <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/78667006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">78667006</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/35489007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">35489007</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/366979004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">366979004</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/255339005" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">255339005</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/F34.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F34.1</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/F32.A" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F32.A</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/F33.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F33.9</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0812393&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0812393</a>, <a href="https://bioportal.bioontology.org/search?q=C0011581&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0011581</a>, <a href="https://bioportal.bioontology.org/search?q=C0460137&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0460137</a>, <a href="https://bioportal.bioontology.org/search?q=C1579931&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1579931</a>, <a href="https://bioportal.bioontology.org/search?q=C0344315&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0344315</a>, <a href="https://bioportal.bioontology.org/search?q=C4085311&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4085311</a>, <a href="https://bioportal.bioontology.org/search?q=C0011570&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0011570</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000716" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000716</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000716" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000716</a>]</span><br /> -
|
|
Auditory and visual hallucinations <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0740399&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0740399</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>
|
|
<span class="h5 mim-font">
|
|
<strong> LABORATORY ABNORMALITIES </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
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|
|
<div>
|
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<span class="mim-font">
|
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|
|
- Granular osmiophilic deposits (GROD) in cells resulting in 'fingerprint' profiles ultrastructurally <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1968932&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1968932</a>]</span><br /> -
|
|
Granular osmiophilic deposits (GROD) in cells resulting in 'curvilinear' profiles ultrastructurally <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1968933&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1968933</a>]</span><br /> -
|
|
Granular osmiophilic deposits (GROD) in cells resulting in 'rectilinear' profiles ultrastructurally <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C5562934&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5562934</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> MISCELLANEOUS </strong>
|
|
</span>
|
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</div>
|
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<div style="margin-left: 2em;">
|
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<div>
|
|
<span class="mim-font">
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|
|
- Onset in adulthood (third to fourth decade) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1853562&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1853562</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003581" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003581</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003581" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003581</a>]</span><br /> -
|
|
For similar autosomal dominant form, see <a href="/entry/162350">162350</a><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> MOLECULAR BASIS </strong>
|
|
</span>
|
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</div>
|
|
<div style="margin-left: 2em;">
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<div>
|
|
<span class="mim-font">
|
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|
|
- Caused by mutation in the CLN6 transmembrane ER protein gene (CLN6, <a href="/entry/606725#0011">606725.0011</a>)<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 class="text-right">
|
|
<a href="#mimClinicalSynopsisFold" data-toggle="collapse">▲ Close</a>
|
|
</div>
|
|
</div>
|
|
</div>
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|
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<div id="mimPhenotypicSeriesFold" class="well well-sm collapse mimSingletonToggleFold">
|
|
<div class="small">
|
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|
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<div class="row">
|
|
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
|
|
<h5>
|
|
Ceroid lipofuscinoses
|
|
- <a href="/phenotypicSeries/PS256730">PS256730</a>
|
|
- 15 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/1/484?start=-3&limit=10&highlight=484"> 1p34.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/256730"> Ceroid lipofuscinosis, neuronal, 1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</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/256730"> 256730 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600722"> PPT1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600722"> 600722 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/4/548?start=-3&limit=10&highlight=548"> 4q28.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610951"> Ceroid lipofuscinosis, neuronal, 7 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</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/610951"> 610951 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611124"> MFSD8 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611124"> 611124 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/7/301?start=-3&limit=10&highlight=301"> 7q11.21 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611726"> Epilepsy, progressive myoclonic 3, with or without intracellular inclusions </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</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/611726"> 611726 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611725"> KCTD7 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/611725"> 611725 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/8/9?start=-3&limit=10&highlight=9"> 8p23.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600143"> Ceroid lipofuscinosis, neuronal, 8 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</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/600143"> 600143 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607837"> CLN8 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607837"> 607837 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/8/9?start=-3&limit=10&highlight=9"> 8p23.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610003"> Ceroid lipofuscinosis, neuronal, 8, Northern epilepsy variant </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</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/610003"> 610003 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607837"> CLN8 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607837"> 607837 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/11/63?start=-3&limit=10&highlight=63"> 11p15.5 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610127"> Ceroid lipofuscinosis, neuronal, 10 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</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/610127"> 610127 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/116840"> CTSD </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/116840"> 116840 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/11/136?start=-3&limit=10&highlight=136"> 11p15.4 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/204500"> Ceroid lipofuscinosis, neuronal, 2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
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<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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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 class="mim-font">
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<a href="/entry/204500"> 204500 </a>
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<span class="mim-font">
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<a href="/entry/607998"> TPP1 </a>
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<span class="mim-font">
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<a href="/entry/607998"> 607998 </a>
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<a href="/geneMap/11/641?start=-3&limit=10&highlight=641"> 11q13.2 </a>
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<span class="mim-font">
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<a href="/entry/615362"> Ceroid lipofuscinosis, neuronal, 13 (Kufs type) </a>
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<span class="mim-font">
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<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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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 class="mim-font">
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<a href="/entry/615362"> 615362 </a>
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<span class="mim-font">
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<a href="/entry/603539"> CTSF </a>
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<span class="mim-font">
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<a href="/entry/603539"> 603539 </a>
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<span class="mim-font">
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<a href="/geneMap/13/231?start=-3&limit=10&highlight=231"> 13q22.3 </a>
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<span class="mim-font">
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<a href="/entry/256731"> Ceroid lipofuscinosis, neuronal, 5 </a>
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<span class="mim-font">
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<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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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 class="mim-font">
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<a href="/entry/256731"> 256731 </a>
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<span class="mim-font">
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<a href="/entry/608102"> CLN5 </a>
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<span class="mim-font">
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<a href="/entry/608102"> 608102 </a>
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<span class="mim-font">
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<a href="/geneMap/15/326?start=-3&limit=10&highlight=326"> 15q23 </a>
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<td>
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<span class="mim-font">
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<a href="/entry/601780"> Ceroid lipofuscinosis, neuronal, 6A </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 recessive">AR</abbr>
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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 class="mim-font">
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<a href="/entry/601780"> 601780 </a>
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<td>
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<span class="mim-font">
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<a href="/entry/606725"> CLN6 </a>
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<td>
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<span class="mim-font">
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<a href="/entry/606725"> 606725 </a>
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<span class="mim-font">
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<a href="/geneMap/15/326?start=-3&limit=10&highlight=326"> 15q23 </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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<a href="/entry/204300"> Ceroid lipofuscinosis, neuronal, 6B (Kufs type) </a>
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</span>
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</td>
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<span class="mim-font">
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<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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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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<td>
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<span class="mim-font">
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<a href="/entry/204300"> 204300 </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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<a href="/entry/606725"> CLN6 </a>
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<td>
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<span class="mim-font">
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<a href="/entry/606725"> 606725 </a>
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<span class="mim-font">
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<a href="/geneMap/16/301?start=-3&limit=10&highlight=301"> 16p12.1 </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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<a href="/entry/204200"> Ceroid lipofuscinosis, neuronal, 3 </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 recessive">AR</abbr>
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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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<span class="mim-font">
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<a href="/entry/204200"> 204200 </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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<a href="/entry/607042"> CLN3 </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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<a href="/entry/607042"> 607042 </a>
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</span>
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<a href="/geneMap/17/638?start=-3&limit=10&highlight=638"> 17q21.31 </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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<a href="/entry/614706"> Ceroid lipofuscinosis, neuronal, 11 </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 recessive">AR</abbr>
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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 class="mim-font">
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<a href="/entry/614706"> 614706 </a>
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</span>
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<td>
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<span class="mim-font">
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<a href="/entry/138945"> GRN </a>
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</span>
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<td>
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<span class="mim-font">
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<a href="/entry/138945"> 138945 </a>
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<span class="mim-font">
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<a href="/geneMap/20/487?start=-3&limit=10&highlight=487"> 20q13.33 </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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<a href="/entry/162350"> Ceroid lipofuscinosis, neuronal, 4 (Kufs type), autosomal dominant </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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<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 class="mim-font">
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<a href="/entry/162350"> 162350 </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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<a href="/entry/611203"> DNAJC5 </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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<a href="/entry/611203"> 611203 </a>
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<span class="mim-font">
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Not Mapped
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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/609055"> Ceroid lipofuscinosis, neuronal, 9 </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 recessive">AR</abbr>
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</span>
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</td>
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<span class="mim-font">
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<span class="mim-font">
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<a href="/entry/609055"> 609055 </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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<a href="/entry/609055"> CLN9 </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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<a href="/entry/609055"> 609055 </a>
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<div class="text-right small">
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<a href="#mimPhenotypicSeriesFold" data-toggle="collapse">▲ Close</a>
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<a id="text" class="mim-anchor"></a>
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<h4 href="#mimTextFold" id="mimTextToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
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<span id="mimTextToggleTriangle" class="small mimTextToggleTriangle">▼</span>
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<span class="mim-font">
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<span class="mim-tip-floating" qtip_title="<strong>Looking For More References?</strong>" qtip_text="Click the 'reference plus' icon <span class='glyphicon glyphicon-plus-sign'></span> at the end of each OMIM text paragraph to see more references related to the content of the preceding paragraph.">
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<strong>TEXT</strong>
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</h4>
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<p>A number sign (#) is used with this entry because autosomal recessive neuronal ceroid lipofuscinosis-6B (CLN6B) is caused by homozygous or compound heterozygous mutation in the CLN6 gene (<a href="/entry/606725">606725</a>) on chromosome 15q23.</p><p>Biallelic mutation in the CLN6 gene can also cause a variant late infantile form of CLN (CLN6A; <a href="/entry/601780">601780</a>).</p>
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<br />
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<div>
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<a id="description" class="mim-anchor"></a>
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<span id="mimDescriptionToggleTriangle" class="small mimTextToggleTriangle">▼</span>
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<strong>Description</strong>
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<p>Neuronal ceroid lipofuscinosis-6B (CLN6B) is an autosomal recessive form of 'Kufs disease,' which refers in general to adult-onset neuronal ceroid lipofuscinosis without retinal involvement. CLN6B is a neurodegenerative disorder with a mean onset of symptoms at around age 28 years, although onset in the teens and later adulthood may also occur. Patients typically present with progressive myoclonus epilepsy, ataxia, loss of motor function, dysarthria, progressive dementia, and progressive cerebral and cerebellar atrophy on brain imaging. Ultrastructural examination typically shows fingerprint profiles and granular osmiophilic deposits in some tissues, including brain samples (summary by <a href="#1" class="mim-tip-reference" title="Arsov, T., Smith, K. R., Damiano, J., Franceschetti, S., Canafoglia, L., Bromhead, C. J., Andermann, E., Vears, D. F., Cossette, P., Rajagopalan, S., McDougall, A., Sofia, V. <strong>Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6.</strong> Am. J. Hum. Genet. 88: 566-573, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21549341/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21549341</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=21549341[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/10.1016/j.ajhg.2011.04.004" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="21549341">Arsov et al., 2011</a> and <a href="#3" class="mim-tip-reference" title="Berkovic, S. F., Oliver, K. L., Canafoglia, L. Krieger, P., Damiano, J. A., Hildebrand, M. S., Morbin, M., Vears, D. F., Sofia, V., Giuliano, L., Garavaglia, B., Simonati, A., and 19 others. <strong>Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features.</strong> Brain 142: 59-69, 2019.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30561534/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30561534</a>] [<a href="https://doi.org/10.1093/brain/awy297" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="30561534">Berkovic et al., 2019</a>). However, pathologic findings in peripheral tissues in adults is not as accurate for diagnosis as it is in children with the disease (<a href="#4" class="mim-tip-reference" title="Cherian, A., K. P. D., Paramasivan, N. K., Krishnan, S. <strong>Pearls & oy-sters: levodopa-responsive adult NCL (type B Kufs) disease due to CLN6 mutation.</strong> Neurology 96: e2662-e2665, 2021.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/33875558/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">33875558</a>] [<a href="https://doi.org/10.1212/WNL.0000000000011997" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="33875558">Cherian et al., 2021</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?term=21549341+30561534+33875558" 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 phenotypic description and a discussion of genetic heterogeneity of CLN, see CLN1 (<a href="/entry/256730">256730</a>).</p>
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<a id="nomenclature" class="mim-anchor"></a>
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<strong>Nomenclature</strong>
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<p>The CLNs were originally classified broadly according to age at onset, and Kufs disease referred to patients with adult onset. Historically, Kufs disease has been clinically classified into 2 overlapping phenotypes: 'type A,' characterized by progressive myoclonic epilepsy, and 'type B,' characterized by dementia and a variety of motor-system signs. However, this distinction is not always clear-cut (summary by <a href="#1" class="mim-tip-reference" title="Arsov, T., Smith, K. R., Damiano, J., Franceschetti, S., Canafoglia, L., Bromhead, C. J., Andermann, E., Vears, D. F., Cossette, P., Rajagopalan, S., McDougall, A., Sofia, V. <strong>Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6.</strong> Am. J. Hum. Genet. 88: 566-573, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21549341/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21549341</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=21549341[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/10.1016/j.ajhg.2011.04.004" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="21549341">Arsov et al., 2011</a>). In a review of CLN, <a href="#8" class="mim-tip-reference" title="Gardner, E., Mole, S. E. <strong>The genetic basis of phenotypic heterogeneity in the neuronal ceroid lipofuscinoses.</strong> Front. Neurol. 12: 754045, 2021.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/34733232/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">34733232</a>] [<a href="https://doi.org/10.3389/fneur.2021.754045" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="34733232">Gardner and Mole (2021)</a> classified CLN6B as Kufs type A with adult onset. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=21549341+34733232" 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>CLN4 (<a href="/entry/162350">162350</a>) is an autosomal dominant form of Kufs disease. Adult onset has been observed in other types of CLN (see, e.g., CLN1, <a href="/entry/256730">256730</a>).</p>
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<p><a href="#10" class="mim-tip-reference" title="Kufs, H. <strong>Ueber eine Spatform der amaurotischen Idiotie und ihre heredofamiliaren Grundlagen.</strong> Z. Ges. Neurol. Psychiat. 95: 169-188, 1925."None>Kufs (1925)</a> reported a case of adult-onset neuronal ceroid lipofuscinosis with onset at age 26 and death at age 38. <a href="#7" class="mim-tip-reference" title="Fine, D. I., Barron, K. D., Hirano, A. <strong>Central nervous system lipidosis in an adult with atrophy of the cerebellar granular layer: a case report.</strong> J. Neuropath. Exp. Neurol. 19: 355-369, 1960.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/13822848/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">13822848</a>] [<a href="https://doi.org/10.1097/00005072-196007000-00004" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="13822848">Fine et al. (1960)</a> found reports of 18 complete histologic descriptions. <a href="#5" class="mim-tip-reference" title="Chou, S. M., Thompson, H. G. <strong>Electron microscopy of storage cytosomes in Kufs' disease.</strong> Arch. Neurol. 23: 489-501, 1970.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5478271/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5478271</a>] [<a href="https://doi.org/10.1001/archneur.1970.00480300011002" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="5478271">Chou and Thompson (1970)</a> reported the morphologic changes in a man who was well until age 17 and died at age 32. A sister was said to have died of a similar clinical picture characterized by seizures, intellectual deterioration, lack of motor control, and development of athetoid movements. The parents were well and were related as first cousins, indicating autosomal recessive inheritance. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=13822848+5478271" 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="#6" class="mim-tip-reference" title="Dom, R., Brucher, J. M., Ceuterick, C., Carton, H., Martin, J. J. <strong>Adult ceroid-lipofuscinosis (Kufs' disease) in two brothers: retinal and visceral storage in one; diagnostic muscle biopsy in the other.</strong> Acta Neuropath. 45: 67-72, 1979.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/760366/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">760366</a>] [<a href="https://doi.org/10.1007/BF00691807" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="760366">Dom et al. (1979)</a> described 2 brothers with Kufs disease. In both, the first manifestation took the form of generalized epileptic seizures, at ages 30 and 32, followed by a cerebellar syndrome with myoclonic jerks and extrapyramidal symptoms. Postmortem examination of 1 brother showed extensive storage of ceroid lipofuscin as curvilinear bodies in the central nervous system and in hepatocytes, heart muscle, and retina. The surviving younger brother showed lipofuscin accumulation on peroneal muscle biopsy. The eye grounds were normal. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=760366" 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="#13" class="mim-tip-reference" title="Tobo, M., Mitsuyama, Y., Ikari, K., Itoi, K. <strong>Familial occurrence of adult-type neuronal ceroid lipofuscinosis.</strong> Arch. Neurol. 41: 1091-1094, 1984.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6477218/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6477218</a>] [<a href="https://doi.org/10.1001/archneur.1984.04050210089022" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="6477218">Tobo et al. (1984)</a> reported adult-onset CLN in a 49-year-old man and his 51-year-old sister, characterized by episodic stuporous and psychotic states, mental retardation, generalized convulsions, and ichthyosis vulgaris. Postmortem examination of the woman showed excessive accumulation of lipofuscin throughout the central nervous system, particularly in neurons of the thalamus, substantia nigra, inferior olivary nuclei, brainstem motor nuclei, and cerebral cortex. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6477218" 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 118 cases in the literature that had been reported as Kufs disease, <a href="#2" class="mim-tip-reference" title="Berkovic, S. F., Carpenter, S., Andermann, F., Andermann, E., Wolfe, L. S. <strong>Kufs' disease: a critical reappraisal.</strong> Brain 111: 27-62, 1988.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/3284607/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">3284607</a>] [<a href="https://doi.org/10.1093/brain/111.1.27" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="3284607">Berkovic et al. (1988)</a> concluded that only 50 cases fulfilled strict clinical and pathologic criteria for the diagnosis. The 68 cases that were excluded had inadequate data, evidence for a storage disease other than Kufs disease, or atypical clinical features. <a href="#2" class="mim-tip-reference" title="Berkovic, S. F., Carpenter, S., Andermann, F., Andermann, E., Wolfe, L. S. <strong>Kufs' disease: a critical reappraisal.</strong> Brain 111: 27-62, 1988.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/3284607/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">3284607</a>] [<a href="https://doi.org/10.1093/brain/111.1.27" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="3284607">Berkovic et al. (1988)</a> noted that diagnostic confusion in the earlier literature may have resulted from lipofuscin accumulation with normal aging or from the fact that electron microscopy was not yet available for definitive diagnosis. <a href="#2" class="mim-tip-reference" title="Berkovic, S. F., Carpenter, S., Andermann, F., Andermann, E., Wolfe, L. S. <strong>Kufs' disease: a critical reappraisal.</strong> Brain 111: 27-62, 1988.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/3284607/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">3284607</a>] [<a href="https://doi.org/10.1093/brain/111.1.27" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="3284607">Berkovic et al. (1988)</a> delineated 2 clinical phenotypes of Kufs disease: type A begins with a progressive myoclonic epilepsy, with later development of dementia and ataxia, and type B is characterized by dementia with cerebellar and/or extrapyramidal motor symptoms. Both types have onset around age 30 years, and both have absence of retinal degeneration or blindness. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=3284607" 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="#9" class="mim-tip-reference" title="Goebel, H. H., Braak, H. <strong>Adult neuronal ceroid-lipofuscinosis.</strong> Clin. Neuropath. 8: 109-119, 1989.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/2663281/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">2663281</a>]" pmid="2663281">Goebel and Braak (1989)</a> provided a detailed review of adult-onset NCL. Psychiatric and behavioral changes, mental deterioration, seizures, extrapyramidal symptoms, and ataxia dominate the clinical picture, while ocular symptoms are conspicuously absent. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=2663281" 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="#11" class="mim-tip-reference" title="Nardocci, N., Verga, M. L., Binelli, S., Zorzi, G., Angelini, L., Bugiani, O. <strong>Neuronal ceroid-lipofuscinosis: a clinical and morphological study of 19 patients.</strong> Am. J. Med. Genet. 57: 137-141, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7668317/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7668317</a>] [<a href="https://doi.org/10.1002/ajmg.1320570205" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7668317">Nardocci et al. (1995)</a> reported findings on 4 patients with adult-onset NCL evaluated at the National Neurological Institute of Milan from 1984 to 1993. Two patients were sibs and 2 were isolated cases. The sibs had onset at ages 38 and 40 years, and the 2 isolated cases had onset at ages 50 and 12 years. The older patients presented with mental deterioration and later developed dystonia, bradykinesia, and ataxia. The younger patient, who was considered to have an adolescent onset of Kufs disease, presented with seizures and myoclonus, and later developed ataxia and mental deterioration. In all patients, visual acuity and funduscopic findings were normal, and MRI showed cerebral and cerebellar atrophy within 6 years of disease onset. All patients showed fingerprint profiles in skin cells, mainly in eccrine sweat gland cells. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7668317" 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="#12" class="mim-tip-reference" title="Sadzot, B., Reznik, M., Arrese-Estrada, J. E., Franck, G. <strong>Familial Kufs' disease presenting as a progressive myoclonic epilepsy.</strong> J. Neurol. 247: 447-454, 2000.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10929274/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10929274</a>] [<a href="https://doi.org/10.1007/s004150070174" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10929274">Sadzot et al. (2000)</a> reported 2 brothers with Kufs disease who presented with progressive myoclonic epilepsy. The first manifestations occurred before age 20 years in both patients, but did not progress significantly until after age 20. Both patients developed dementia and were in a vegetative state by age 30. Postmortem examination of 1 patient showed characteristic autofluorescent storage material in neurons with fingerprint profiles and strong immunoreactivity against subunit c of mitochondrial ATP synthase (<a href="/entry/603192">603192</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10929274" 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="Arsov, T., Smith, K. R., Damiano, J., Franceschetti, S., Canafoglia, L., Bromhead, C. J., Andermann, E., Vears, D. F., Cossette, P., Rajagopalan, S., McDougall, A., Sofia, V. <strong>Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6.</strong> Am. J. Hum. Genet. 88: 566-573, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21549341/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21549341</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=21549341[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/10.1016/j.ajhg.2011.04.004" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="21549341">Arsov et al. (2011)</a> reported 6 unrelated families with type A Kufs disease. Age at onset ranged from 16 to 51 years. Most had initial tonic-clonic seizures or action myoclonus, followed by cognitive decline or dementia. Some had ataxia. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21549341" 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="#3" class="mim-tip-reference" title="Berkovic, S. F., Oliver, K. L., Canafoglia, L. Krieger, P., Damiano, J. A., Hildebrand, M. S., Morbin, M., Vears, D. F., Sofia, V., Giuliano, L., Garavaglia, B., Simonati, A., and 19 others. <strong>Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features.</strong> Brain 142: 59-69, 2019.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30561534/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30561534</a>] [<a href="https://doi.org/10.1093/brain/awy297" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="30561534">Berkovic et al. (2019)</a> studied 20 patients with type A Kufs disease from 13 unrelated families. Twelve patients had previously been reported, and follow-up information was provided for 9 of them. Mean age of onset was 28 years (range, 12-51 years). Patients typically presented with progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures. Patients became wheelchair-bound at a mean of 12 years after onset. Median survival time was 26 years (range, 8-31 years) from disease onset. Ataxia was the most prominent motor feature and dysarthria was also prominent. Dementia appeared to be invariable, although onset varied. In about a quarter of the patients, cognitive, behavioral or motor changes were present a few years before myoclonic seizures. Epileptiform discharges that were generalized, multifocal or posteriorly predominant were observed on EEG, with photosensitivity, often at low frequency, seen in 17 of 18 cases. None of the patients had retinal involvement. MRI showed progressive cerebral and cerebellar atrophy. Ultrastructural examination revealed fingerprint profiles as the characteristic inclusions, but they were not reliably seen in tissues other than the brain. Curvilinear profiles, which are seen in the late infantile form, were not a feature. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30561534" 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="#4" class="mim-tip-reference" title="Cherian, A., K. P. D., Paramasivan, N. K., Krishnan, S. <strong>Pearls & oy-sters: levodopa-responsive adult NCL (type B Kufs) disease due to CLN6 mutation.</strong> Neurology 96: e2662-e2665, 2021.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/33875558/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">33875558</a>] [<a href="https://doi.org/10.1212/WNL.0000000000011997" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="33875558">Cherian et al. (2021)</a> reported a 29-year-old woman, born of consanguineous parents, who presented with insidious onset of progressive neurodegeneration beginning around 14 years of age. She had cognitive decline and dropped out of school. Features included poor social skills, memory loss, way-finding difficulties, calculation errors, and generalized disinterest. She got married and had 2 children, but was unable to care for them properly. As an adult, she had reduced verbal output, hypophonia, dysphagia, tremor, and progressive cognitive decline. She had 2 episodes of generalized convulsions, but no history of seizures or myoclonus. Additional features included hypomimia, dysarthria, oromandibular dyspraxia, rigidity, bradykinesia, and occasional urinary incontinence. EEG studies showed a photoparoxysmal response to photic stimulation, indicating photosensitivity. Otherwise, she did not have eye or retinal involvement. Brain imaging showed mild cerebral atrophy and significant cerebellar atrophy. Treatment with levodopa resulted in a remarkable improvement in motor function with regaining of independent ambulation. However, she continued to have severe frontal executive dysfunction. <a href="#4" class="mim-tip-reference" title="Cherian, A., K. P. D., Paramasivan, N. K., Krishnan, S. <strong>Pearls & oy-sters: levodopa-responsive adult NCL (type B Kufs) disease due to CLN6 mutation.</strong> Neurology 96: e2662-e2665, 2021.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/33875558/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">33875558</a>] [<a href="https://doi.org/10.1212/WNL.0000000000011997" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="33875558">Cherian et al. (2021)</a> concluded that the phenotype was consistent with type B Kufs disease. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=33875558" 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>The transmission pattern of CLN6B in the families reported by <a href="#1" class="mim-tip-reference" title="Arsov, T., Smith, K. R., Damiano, J., Franceschetti, S., Canafoglia, L., Bromhead, C. J., Andermann, E., Vears, D. F., Cossette, P., Rajagopalan, S., McDougall, A., Sofia, V. <strong>Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6.</strong> Am. J. Hum. Genet. 88: 566-573, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21549341/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21549341</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=21549341[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/10.1016/j.ajhg.2011.04.004" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="21549341">Arsov et al. (2011)</a> was consistent with autosomal recessive inheritance. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21549341" 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>By genomewide mapping followed by candidate gene sequencing in 3 families with autosomal recessive Kufs disease, <a href="#1" class="mim-tip-reference" title="Arsov, T., Smith, K. R., Damiano, J., Franceschetti, S., Canafoglia, L., Bromhead, C. J., Andermann, E., Vears, D. F., Cossette, P., Rajagopalan, S., McDougall, A., Sofia, V. <strong>Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6.</strong> Am. J. Hum. Genet. 88: 566-573, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21549341/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21549341</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=21549341[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/10.1016/j.ajhg.2011.04.004" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="21549341">Arsov et al. (2011)</a> identified homozygous or compound heterozygous mutations in the CLN6 gene (see, e.g., <a href="/entry/606725#0011">606725.0011</a>-<a href="/entry/606725#0014">606725.0014</a>). Mutations were also found in affected members from 4 additional families with Kufs disease, yielding a total of 9 different pathogenic mutations in the CLN6 gene. All patients from the 7 families had progressive myoclonic epilepsy followed by dementia, consistent with a type A phenotype. There were no apparent genotype/phenotype correlations. Mutation in the CLN6 gene was not found in 1 family with a type B phenotype. <a href="#1" class="mim-tip-reference" title="Arsov, T., Smith, K. R., Damiano, J., Franceschetti, S., Canafoglia, L., Bromhead, C. J., Andermann, E., Vears, D. F., Cossette, P., Rajagopalan, S., McDougall, A., Sofia, V. <strong>Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6.</strong> Am. J. Hum. Genet. 88: 566-573, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21549341/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21549341</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=21549341[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/10.1016/j.ajhg.2011.04.004" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="21549341">Arsov et al. (2011)</a> noted the striking phenotypic differences between patients with earlier onset CLN6A and patients with Kufs disease. Patients with CLN6A have retinal involvement, whereas none of the Kufs syndrome patients had retinal involvement. The authors suggested that Kufs syndrome patients may have some residual mutant protein function or that there are other disease modifiers. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21549341" 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 13 unrelated families with neuronal ceroid lipofuscinosis (type A Kufs), <a href="#3" class="mim-tip-reference" title="Berkovic, S. F., Oliver, K. L., Canafoglia, L. Krieger, P., Damiano, J. A., Hildebrand, M. S., Morbin, M., Vears, D. F., Sofia, V., Giuliano, L., Garavaglia, B., Simonati, A., and 19 others. <strong>Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features.</strong> Brain 142: 59-69, 2019.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30561534/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30561534</a>] [<a href="https://doi.org/10.1093/brain/awy297" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="30561534">Berkovic et al. (2019)</a> identified homozygous CLN6 variants in 4 families and compound heterozygous variants in 9. Most pathogenic variants were predicted to result in amino acid substitutions; however, there were 4 heterozygous pathogenic variants predicting protein truncations, including 2 small deletions and/or insertions (indels), 1 large deletion, and 1 canonical splice site change. Compared to the variant late infantile form (see <a href="/entry/601780">601780</a>), fewer of the variants predicted protein truncation. Certain heterozygous missense variants in the same amino acid position were found in both the variant late infantile form and adult-onset Kufs disease; whether onset was in late infancy or adulthood depended on the mutation severity of the second allele. Of the 13 families, 9 were of Italian ancestry. The authors noted that this was likely a product of these rare pathogenic variants being founder mutations in mainland Italy, Sicily, and Malta. The authors also noted that molecular diagnosis can now largely replace the previous 'gold standard' for diagnosis, ultrastructural examination of brain tissue. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30561534" 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 29-year-old woman with CLN6B, <a href="#4" class="mim-tip-reference" title="Cherian, A., K. P. D., Paramasivan, N. K., Krishnan, S. <strong>Pearls & oy-sters: levodopa-responsive adult NCL (type B Kufs) disease due to CLN6 mutation.</strong> Neurology 96: e2662-e2665, 2021.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/33875558/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">33875558</a>] [<a href="https://doi.org/10.1212/WNL.0000000000011997" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="33875558">Cherian et al. (2021)</a> identified a homozygous missense mutation in the CLN6 gene (I117S; <a href="/entry/606725#0018">606725.0018</a>). The mutation was found by next-generation sequencing. Functional studies of the variant were not performed. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=33875558" 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="#Zeman1962" class="mim-tip-reference" title="Zeman, W., Hoffman, J. <strong>Juvenile and late forms of amaurotic idiocy in one family.</strong> J. Neurol. Neurosurg. Psychiat. 25: 352-362, 1962.">Zeman and Hoffman (1962)</a>
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Arsov, T., Smith, K. R., Damiano, J., Franceschetti, S., Canafoglia, L., Bromhead, C. J., Andermann, E., Vears, D. F., Cossette, P., Rajagopalan, S., McDougall, A., Sofia, V.
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<strong>Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6.</strong>
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Am. J. Hum. Genet. 88: 566-573, 2011.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21549341/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21549341</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=21549341[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21549341" 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/10.1016/j.ajhg.2011.04.004" target="_blank">Full Text</a>]
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Berkovic, S. F., Carpenter, S., Andermann, F., Andermann, E., Wolfe, L. S.
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<strong>Kufs' disease: a critical reappraisal.</strong>
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[<a href="https://doi.org/10.1093/brain/111.1.27" target="_blank">Full Text</a>]
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Berkovic, S. F., Oliver, K. L., Canafoglia, L. Krieger, P., Damiano, J. A., Hildebrand, M. S., Morbin, M., Vears, D. F., Sofia, V., Giuliano, L., Garavaglia, B., Simonati, A., and 19 others.
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<strong>Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features.</strong>
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Brain 142: 59-69, 2019.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30561534/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30561534</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30561534" 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/10.1093/brain/awy297" target="_blank">Full Text</a>]
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Cherian, A., K. P. D., Paramasivan, N. K., Krishnan, S.
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<strong>Pearls & oy-sters: levodopa-responsive adult NCL (type B Kufs) disease due to CLN6 mutation.</strong>
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Neurology 96: e2662-e2665, 2021.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/33875558/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">33875558</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=33875558" 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/10.1212/WNL.0000000000011997" target="_blank">Full Text</a>]
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Chou, S. M., Thompson, H. G.
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<strong>Electron microscopy of storage cytosomes in Kufs' disease.</strong>
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Arch. Neurol. 23: 489-501, 1970.
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[<a href="https://doi.org/10.1001/archneur.1970.00480300011002" target="_blank">Full Text</a>]
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Dom, R., Brucher, J. M., Ceuterick, C., Carton, H., Martin, J. J.
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Fine, D. I., Barron, K. D., Hirano, A.
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[<a href="https://doi.org/10.1097/00005072-196007000-00004" target="_blank">Full Text</a>]
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Gardner, E., Mole, S. E.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/34733232/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">34733232</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=34733232" 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/10.3389/fneur.2021.754045" target="_blank">Full Text</a>]
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Kufs, H.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7668317/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7668317</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7668317" 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/10.1002/ajmg.1320570205" target="_blank">Full Text</a>]
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Sadzot, B., Reznik, M., Arrese-Estrada, J. E., Franck, G.
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<strong>Familial Kufs' disease presenting as a progressive myoclonic epilepsy.</strong>
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J. Neurol. 247: 447-454, 2000.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10929274/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10929274</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10929274" 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/s004150070174" target="_blank">Full Text</a>]
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Tobo, M., Mitsuyama, Y., Ikari, K., Itoi, K.
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<strong>Familial occurrence of adult-type neuronal ceroid lipofuscinosis.</strong>
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Arch. Neurol. 41: 1091-1094, 1984.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6477218/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6477218</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6477218" 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/10.1001/archneur.1984.04050210089022" target="_blank">Full Text</a>]
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Zeman, W., Hoffman, J.
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<strong>Juvenile and late forms of amaurotic idiocy in one family.</strong>
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J. Neurol. Neurosurg. Psychiat. 25: 352-362, 1962.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/14003453/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">14003453</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=14003453" 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/10.1136/jnnp.25.4.352" target="_blank">Full Text</a>]
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Cassandra L. Kniffin - updated : 12/01/2021
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Cassandra L. Kniffin - updated : 07/23/2021<br>Sonja A. Rasmussen - updated : 02/19/2019<br>Cassandra L. Kniffin - updated : 5/16/2011<br>Cassandra L. Kniffin - updated : 5/5/2006<br>Cassandra L. Kniffin - updated : 3/16/2006<br>Cassandra L. Kniffin - reorganized : 7/31/2003<br>Cassandra L. Kniffin - updated : 7/30/2003
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Victor A. McKusick : 6/3/1986
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alopez : 05/05/2023
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carol : 03/03/2022<br>carol : 12/01/2021<br>ckniffin : 12/01/2021<br>carol : 07/27/2021<br>carol : 07/26/2021<br>ckniffin : 07/23/2021<br>carol : 02/20/2019<br>carol : 02/19/2019<br>carol : 06/08/2016<br>carol : 8/14/2013<br>ckniffin : 8/8/2013<br>wwang : 5/17/2011<br>ckniffin : 5/16/2011<br>ckniffin : 7/6/2007<br>wwang : 5/15/2006<br>ckniffin : 5/5/2006<br>carol : 3/24/2006<br>ckniffin : 3/21/2006<br>ckniffin : 3/16/2006<br>terry : 2/22/2005<br>carol : 7/31/2003<br>carol : 7/31/2003<br>ckniffin : 7/30/2003<br>carol : 6/14/2001<br>dkim : 7/23/1998<br>mark : 10/6/1997<br>mark : 6/19/1997<br>mark : 12/4/1995<br>supermim : 3/16/1992<br>carol : 6/25/1990<br>supermim : 3/20/1990<br>ddp : 10/26/1989<br>marie : 3/25/1988<br>reenie : 10/18/1986
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CEROID LIPOFUSCINOSIS, NEURONAL, 6B (KUFS TYPE); CLN6B
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<strong>ORPHA:</strong> 228363;
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<strong>DO:</strong> 0110730;
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15q23
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Ceroid lipofuscinosis, neuronal, 6B (Kufs type)
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Autosomal recessive
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CLN6
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606725
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<p>A number sign (#) is used with this entry because autosomal recessive neuronal ceroid lipofuscinosis-6B (CLN6B) is caused by homozygous or compound heterozygous mutation in the CLN6 gene (606725) on chromosome 15q23.</p><p>Biallelic mutation in the CLN6 gene can also cause a variant late infantile form of CLN (CLN6A; 601780).</p>
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<p>Neuronal ceroid lipofuscinosis-6B (CLN6B) is an autosomal recessive form of 'Kufs disease,' which refers in general to adult-onset neuronal ceroid lipofuscinosis without retinal involvement. CLN6B is a neurodegenerative disorder with a mean onset of symptoms at around age 28 years, although onset in the teens and later adulthood may also occur. Patients typically present with progressive myoclonus epilepsy, ataxia, loss of motor function, dysarthria, progressive dementia, and progressive cerebral and cerebellar atrophy on brain imaging. Ultrastructural examination typically shows fingerprint profiles and granular osmiophilic deposits in some tissues, including brain samples (summary by Arsov et al., 2011 and Berkovic et al., 2019). However, pathologic findings in peripheral tissues in adults is not as accurate for diagnosis as it is in children with the disease (Cherian et al., 2021). </p><p>For a general phenotypic description and a discussion of genetic heterogeneity of CLN, see CLN1 (256730).</p>
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<p>The CLNs were originally classified broadly according to age at onset, and Kufs disease referred to patients with adult onset. Historically, Kufs disease has been clinically classified into 2 overlapping phenotypes: 'type A,' characterized by progressive myoclonic epilepsy, and 'type B,' characterized by dementia and a variety of motor-system signs. However, this distinction is not always clear-cut (summary by Arsov et al., 2011). In a review of CLN, Gardner and Mole (2021) classified CLN6B as Kufs type A with adult onset. </p><p>CLN4 (162350) is an autosomal dominant form of Kufs disease. Adult onset has been observed in other types of CLN (see, e.g., CLN1, 256730).</p>
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<p>Kufs (1925) reported a case of adult-onset neuronal ceroid lipofuscinosis with onset at age 26 and death at age 38. Fine et al. (1960) found reports of 18 complete histologic descriptions. Chou and Thompson (1970) reported the morphologic changes in a man who was well until age 17 and died at age 32. A sister was said to have died of a similar clinical picture characterized by seizures, intellectual deterioration, lack of motor control, and development of athetoid movements. The parents were well and were related as first cousins, indicating autosomal recessive inheritance. </p><p>Dom et al. (1979) described 2 brothers with Kufs disease. In both, the first manifestation took the form of generalized epileptic seizures, at ages 30 and 32, followed by a cerebellar syndrome with myoclonic jerks and extrapyramidal symptoms. Postmortem examination of 1 brother showed extensive storage of ceroid lipofuscin as curvilinear bodies in the central nervous system and in hepatocytes, heart muscle, and retina. The surviving younger brother showed lipofuscin accumulation on peroneal muscle biopsy. The eye grounds were normal. </p><p>Tobo et al. (1984) reported adult-onset CLN in a 49-year-old man and his 51-year-old sister, characterized by episodic stuporous and psychotic states, mental retardation, generalized convulsions, and ichthyosis vulgaris. Postmortem examination of the woman showed excessive accumulation of lipofuscin throughout the central nervous system, particularly in neurons of the thalamus, substantia nigra, inferior olivary nuclei, brainstem motor nuclei, and cerebral cortex. </p><p>Of 118 cases in the literature that had been reported as Kufs disease, Berkovic et al. (1988) concluded that only 50 cases fulfilled strict clinical and pathologic criteria for the diagnosis. The 68 cases that were excluded had inadequate data, evidence for a storage disease other than Kufs disease, or atypical clinical features. Berkovic et al. (1988) noted that diagnostic confusion in the earlier literature may have resulted from lipofuscin accumulation with normal aging or from the fact that electron microscopy was not yet available for definitive diagnosis. Berkovic et al. (1988) delineated 2 clinical phenotypes of Kufs disease: type A begins with a progressive myoclonic epilepsy, with later development of dementia and ataxia, and type B is characterized by dementia with cerebellar and/or extrapyramidal motor symptoms. Both types have onset around age 30 years, and both have absence of retinal degeneration or blindness. </p><p>Goebel and Braak (1989) provided a detailed review of adult-onset NCL. Psychiatric and behavioral changes, mental deterioration, seizures, extrapyramidal symptoms, and ataxia dominate the clinical picture, while ocular symptoms are conspicuously absent. </p><p>Nardocci et al. (1995) reported findings on 4 patients with adult-onset NCL evaluated at the National Neurological Institute of Milan from 1984 to 1993. Two patients were sibs and 2 were isolated cases. The sibs had onset at ages 38 and 40 years, and the 2 isolated cases had onset at ages 50 and 12 years. The older patients presented with mental deterioration and later developed dystonia, bradykinesia, and ataxia. The younger patient, who was considered to have an adolescent onset of Kufs disease, presented with seizures and myoclonus, and later developed ataxia and mental deterioration. In all patients, visual acuity and funduscopic findings were normal, and MRI showed cerebral and cerebellar atrophy within 6 years of disease onset. All patients showed fingerprint profiles in skin cells, mainly in eccrine sweat gland cells. </p><p>Sadzot et al. (2000) reported 2 brothers with Kufs disease who presented with progressive myoclonic epilepsy. The first manifestations occurred before age 20 years in both patients, but did not progress significantly until after age 20. Both patients developed dementia and were in a vegetative state by age 30. Postmortem examination of 1 patient showed characteristic autofluorescent storage material in neurons with fingerprint profiles and strong immunoreactivity against subunit c of mitochondrial ATP synthase (603192). </p><p>Arsov et al. (2011) reported 6 unrelated families with type A Kufs disease. Age at onset ranged from 16 to 51 years. Most had initial tonic-clonic seizures or action myoclonus, followed by cognitive decline or dementia. Some had ataxia. </p><p>Berkovic et al. (2019) studied 20 patients with type A Kufs disease from 13 unrelated families. Twelve patients had previously been reported, and follow-up information was provided for 9 of them. Mean age of onset was 28 years (range, 12-51 years). Patients typically presented with progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures. Patients became wheelchair-bound at a mean of 12 years after onset. Median survival time was 26 years (range, 8-31 years) from disease onset. Ataxia was the most prominent motor feature and dysarthria was also prominent. Dementia appeared to be invariable, although onset varied. In about a quarter of the patients, cognitive, behavioral or motor changes were present a few years before myoclonic seizures. Epileptiform discharges that were generalized, multifocal or posteriorly predominant were observed on EEG, with photosensitivity, often at low frequency, seen in 17 of 18 cases. None of the patients had retinal involvement. MRI showed progressive cerebral and cerebellar atrophy. Ultrastructural examination revealed fingerprint profiles as the characteristic inclusions, but they were not reliably seen in tissues other than the brain. Curvilinear profiles, which are seen in the late infantile form, were not a feature. </p><p>Cherian et al. (2021) reported a 29-year-old woman, born of consanguineous parents, who presented with insidious onset of progressive neurodegeneration beginning around 14 years of age. She had cognitive decline and dropped out of school. Features included poor social skills, memory loss, way-finding difficulties, calculation errors, and generalized disinterest. She got married and had 2 children, but was unable to care for them properly. As an adult, she had reduced verbal output, hypophonia, dysphagia, tremor, and progressive cognitive decline. She had 2 episodes of generalized convulsions, but no history of seizures or myoclonus. Additional features included hypomimia, dysarthria, oromandibular dyspraxia, rigidity, bradykinesia, and occasional urinary incontinence. EEG studies showed a photoparoxysmal response to photic stimulation, indicating photosensitivity. Otherwise, she did not have eye or retinal involvement. Brain imaging showed mild cerebral atrophy and significant cerebellar atrophy. Treatment with levodopa resulted in a remarkable improvement in motor function with regaining of independent ambulation. However, she continued to have severe frontal executive dysfunction. Cherian et al. (2021) concluded that the phenotype was consistent with type B Kufs disease. </p>
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<p>The transmission pattern of CLN6B in the families reported by Arsov et al. (2011) was consistent with autosomal recessive inheritance. </p>
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<p>By genomewide mapping followed by candidate gene sequencing in 3 families with autosomal recessive Kufs disease, Arsov et al. (2011) identified homozygous or compound heterozygous mutations in the CLN6 gene (see, e.g., 606725.0011-606725.0014). Mutations were also found in affected members from 4 additional families with Kufs disease, yielding a total of 9 different pathogenic mutations in the CLN6 gene. All patients from the 7 families had progressive myoclonic epilepsy followed by dementia, consistent with a type A phenotype. There were no apparent genotype/phenotype correlations. Mutation in the CLN6 gene was not found in 1 family with a type B phenotype. Arsov et al. (2011) noted the striking phenotypic differences between patients with earlier onset CLN6A and patients with Kufs disease. Patients with CLN6A have retinal involvement, whereas none of the Kufs syndrome patients had retinal involvement. The authors suggested that Kufs syndrome patients may have some residual mutant protein function or that there are other disease modifiers. </p><p>In 13 unrelated families with neuronal ceroid lipofuscinosis (type A Kufs), Berkovic et al. (2019) identified homozygous CLN6 variants in 4 families and compound heterozygous variants in 9. Most pathogenic variants were predicted to result in amino acid substitutions; however, there were 4 heterozygous pathogenic variants predicting protein truncations, including 2 small deletions and/or insertions (indels), 1 large deletion, and 1 canonical splice site change. Compared to the variant late infantile form (see 601780), fewer of the variants predicted protein truncation. Certain heterozygous missense variants in the same amino acid position were found in both the variant late infantile form and adult-onset Kufs disease; whether onset was in late infancy or adulthood depended on the mutation severity of the second allele. Of the 13 families, 9 were of Italian ancestry. The authors noted that this was likely a product of these rare pathogenic variants being founder mutations in mainland Italy, Sicily, and Malta. The authors also noted that molecular diagnosis can now largely replace the previous 'gold standard' for diagnosis, ultrastructural examination of brain tissue. </p><p>In a 29-year-old woman with CLN6B, Cherian et al. (2021) identified a homozygous missense mutation in the CLN6 gene (I117S; 606725.0018). The mutation was found by next-generation sequencing. Functional studies of the variant were not performed. </p>
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Zeman and Hoffman (1962)
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