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Entry
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- #133700 - EXOSTOSES, MULTIPLE, TYPE I; EXT1
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- OMIM
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<p>
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<span class="h4">#133700</span>
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<br />
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<strong>Table of Contents</strong>
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<a href="#title"><strong>Title</strong></a>
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<a href="#phenotypeMap"><strong>Phenotype-Gene Relationships</strong></a>
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<a href="/clinicalSynopsis/133700"><strong>Clinical Synopsis</strong></a>
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<a href="/phenotypicSeries/PS133700"> <strong>Phenotypic Series</strong> </a>
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<a href="#text"><strong>Text</strong></a>
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<a href="#description">Description</a>
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<a href="#clinicalFeatures">Clinical Features</a>
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<a href="#clinicalManagement">Clinical Management</a>
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<a href="#mapping">Mapping</a>
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<a href="#molecularGenetics">Molecular Genetics</a>
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<a href="#genotypePhenotypeCorrelations">Genotype/Phenotype Correlations</a>
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<a href="#history">History</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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<li role="presentation">
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<a href="#creationDate"><strong>Creation Date</strong></a>
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<a href="#editHistory"><strong>Edit History</strong></a>
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<div style="display: table-cell;">External Links</div>
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</a>
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</h4>
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<div class="panel-heading mim-panel-heading" role="tab" id="mimClinicalResources">
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<span class="panel-title">
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<span class="small">
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<a href="#mimClinicalResourcesLinksFold" id="mimClinicalResourcesLinksToggle" class=" mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
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<div style="display: table-row">
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<div id="mimClinicalResourcesLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">▼</div>
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<div style="display: table-cell;">Clinical Resources</div>
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</div>
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</a>
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</span>
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</span>
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<div id="mimClinicalResourcesLinksFold" class="panel-collapse collapse in mimLinksFold" role="tabpanel" aria-labelledby="clinicalResources">
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<div class="panel-body small mim-panel-body">
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<div><a href="https://clinicaltrials.gov/search?cond=EXOSTOSES, MULTIPLE, TYPE I" class="mim-tip-hint" title="A registry of federally and privately supported clinical trials conducted in the United States and around the world." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Clinical Trials', 'domain': 'clinicaltrials.gov'})">Clinical Trials</a></div>
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<div><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=3247&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.ncbi.nlm.nih.gov/books/NBK1235/" class="mim-tip-hint" title="Expert-authored, peer-reviewed descriptions of inherited disorders including the uses of genetic testing in diagnosis, management, and genetic counseling." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Gene Reviews', 'domain': 'ncbi.nlm.nih.gov'})">Gene Reviews</a></div>
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<div><a href="https://www.diseaseinfosearch.org/x/8916" 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=133700[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=321" 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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<div><a href="https://www.possumcore.com/nuxeo/nxdoc/default/67fbbd15-ef9e-4ff6-944d-a7c6e382acdc/view_documents?source=omim" class="mim-tip-hint" title="A dysmorphology database of multiple malformations; metabolic, teratogenic, chromosomal, and skeletal syndromes; and their images." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'POSSUM', 'domain': 'possum.net.au'})">POSSUM</a></div>
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</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 class="panel-title">
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<span class="small">
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<a href="#mimAnimalModelsLinksFold" id="mimAnimalModelsLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
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<div style="display: table-row">
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<div id="mimAnimalModelsLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">►</div>
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<div style="display: table-cell;">Animal Models</div>
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</div>
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</a>
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</span>
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</span>
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</div>
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<div id="mimAnimalModelsLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel">
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<div class="panel-body small mim-panel-body">
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<div><a href="https://www.alliancegenome.org/disease/DOID:206" 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/133700" class="mim-tip-hint" title="Phenotypes, alleles, and disease models from Mouse Genome Informatics." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MGI Mouse Phenotype', 'domain': 'informatics.jax.org'})">MGI Mouse Phenotype</a></div>
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<div><a href="https://omia.org/results?search_type=advanced&omia_id=000354,002554" class="mim-tip-hint" title="OMIA" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OMIA', 'domain': 'omia.angis.org.au'})">OMIA</a></div>
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<div><a href="https://wormbase.org/resources/disease/DOID:206" class="mim-tip-hint" title="Database of the biology and genome of Caenorhabditis elegans and related nematodes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Disease Ontology', 'domain': 'wormbase.org'})">Wormbase Disease Ontology</a></div>
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<div class="panel panel-default" style="margin-top: 0px; border-radius: 0px">
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<span class="small">
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<a href="#mimCellLinesLinksFold" id="mimCellLinesLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
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<div id="mimCellLinesLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">►</div>
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<div style="display: table-cell;">Cell Lines</div>
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</a>
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</span>
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<div id="mimCellLinesLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel">
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<div class="panel-body small mim-panel-body">
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<div><a href="https://catalog.coriell.org/Search?q=OmimNum:133700" class="definition" title="Coriell Cell Repositories; cell cultures and DNA derived from cell cultures." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'CCR', 'domain': 'ccr.coriell.org'})">Coriell</a></div>
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<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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</div>
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<div class="col-lg-8 col-lg-pull-2 col-md-8 col-md-pull-2 col-sm-8 col-sm-pull-2 col-xs-12">
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<div>
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<a id="title" class="mim-anchor"></a>
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<div>
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<a id="number" class="mim-anchor"></a>
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<div class="text-right">
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<a href="#" class="mim-tip-icd" qtip_title="<strong>ICD+</strong>" qtip_text="
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<strong>SNOMEDCT:</strong> 254044004<br />
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<strong>ICD10CM:</strong> Q78.6<br />
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<strong>ORPHA:</strong> 321<br />
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<strong>DO:</strong> 206<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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133700
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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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EXOSTOSES, MULTIPLE, TYPE I; EXT1
|
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</span>
|
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</h3>
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</div>
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<div>
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<br />
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</div>
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<div>
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<a id="alternativeTitles" class="mim-anchor"></a>
|
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<div>
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<p>
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<span class="mim-font">
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<em>Alternative titles; symbols</em>
|
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</span>
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</p>
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</div>
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<div>
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<h4>
|
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<span class="mim-font">
|
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EXT<br />
|
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MULTIPLE CARTILAGINOUS EXOSTOSES<br />
|
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DIAPHYSEAL ACLASIS<br />
|
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MULTIPLE OSTEOCHONDROMAS<br />
|
|
OSTEOCHONDROMATOSIS
|
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</span>
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</h4>
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</div>
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</div>
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<div>
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<br />
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<div>
|
|
<a id="phenotypeMap" class="mim-anchor"></a>
|
|
<h4>
|
|
<span class="mim-font">
|
|
<strong>Phenotype-Gene Relationships</strong>
|
|
</span>
|
|
</h4>
|
|
<div>
|
|
<table class="table table-bordered table-condensed table-hover small mim-table-padding">
|
|
<thead>
|
|
<tr class="active">
|
|
<th>
|
|
Location
|
|
</th>
|
|
<th>
|
|
Phenotype
|
|
</th>
|
|
<th>
|
|
Phenotype <br /> MIM number
|
|
</th>
|
|
<th>
|
|
Inheritance
|
|
</th>
|
|
<th>
|
|
Phenotype <br /> mapping key
|
|
</th>
|
|
<th>
|
|
Gene/Locus
|
|
</th>
|
|
<th>
|
|
Gene/Locus <br /> MIM number
|
|
</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/geneMap/8/504?start=-3&limit=10&highlight=504">
|
|
8q24.11
|
|
</a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
Exostoses, multiple, type 1
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/133700"> 133700 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
EXT1
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608177"> 608177 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div>
|
|
|
|
|
|
<div class="btn-group ">
|
|
<a href="/clinicalSynopsis/133700" 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')">
|
|
<span class="caret"></span>
|
|
<span class="sr-only">Toggle Dropdown</span>
|
|
</button>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="btn-group">
|
|
|
|
<a href="/phenotypicSeries/PS133700" class="btn btn-info" role="button"> Phenotypic Series </a>
|
|
|
|
<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>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<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/133700" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
|
|
<li><a href="/graph/radial/133700" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Radial'})"> Radial </a></li>
|
|
</ul>
|
|
</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>
|
|
|
|
|
|
|
|
<div>
|
|
<p />
|
|
</div>
|
|
|
|
|
|
<div id="mimClinicalSynopsisFold" class="well well-sm collapse mimSingletonToggleFold">
|
|
<div class="small" style="margin: 5px">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<strong> INHERITANCE </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
|
|
<div>
|
|
<span class="mim-font">
|
|
|
|
- Autosomal dominant <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/263681008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">263681008</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/771269000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">771269000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0443147&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0443147</a>, <a href="https://bioportal.bioontology.org/search?q=C1867440&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1867440</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span><br />
|
|
|
|
</span>
|
|
</div>
|
|
|
|
</div>
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<strong> GROWTH </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<em> Height </em>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Short stature in less than 50% <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1851416&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1851416</a>]</span><br />
|
|
|
|
</span>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
</div>
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<strong> CHEST </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<em> Ribs Sternum Clavicles & Scapulae </em>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Rib exostoses <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1835579&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1835579</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000896" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000896</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000896" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000896</a>]</span><br /> -
|
|
Scapular exostoses <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1851415&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1851415</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000918" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000918</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000918" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000918</a>]</span><br />
|
|
|
|
</span>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
</div>
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<strong> SKELETAL </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<em> Pelvis </em>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Coxa vara <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/12067001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">12067001</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/74820003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">74820003</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/1179328008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">1179328008</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/Q65.82" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">Q65.82</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/736.32" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">736.32</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/755.62" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">755.62</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0239138&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0239138</a>, <a href="https://bioportal.bioontology.org/search?q=C5551440&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5551440</a>, <a href="https://bioportal.bioontology.org/search?q=C0158481&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0158481</a>, <a href="https://bioportal.bioontology.org/search?q=C0152431&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0152431</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002812" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002812</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002812" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002812</a>]</span><br /> -
|
|
Pelvic exostoses <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1844689&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1844689</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003276" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003276</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003276" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003276</a>]</span><br />
|
|
|
|
</span>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<em> Limbs </em>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Protuberances at ends of long bones <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1851418&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1851418</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003105" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003105</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003105" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003105</a>]</span><br /> -
|
|
Short metacarpal <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1837084&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1837084</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0010049" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0010049</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0010049" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0010049</a>]</span> <a href="https://elementsofmorphology.nih.gov/index.cgi?tid=bbffe73721c15b13e67a7f229d9c9acd" target="_blank" class="small mim-tip-eom" title="<img src="https://elementsofmorphology.nih.gov/images/terms/Metacarpal,Short-small.jpg"> <br/>Further Information: <a href="https://elementsofmorphology.nih.gov/index.cgi?tid=bbffe73721c15b13e67a7f229d9c9acd" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'EOM\', \'domain\': \'elementsofmorphology.nih.gov\'})">Elements of Morphology</a>"><span class="glyphicon glyphicon-user" aria-hidden="true"></span></a><br /> -
|
|
Exostoses in juxtaepiphyseal regions of long bones <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1851425&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1851425</a>]</span><br /> -
|
|
Genu valgum <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/299330008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">299330008</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/52012001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">52012001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/M21.06" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">M21.06</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/736.41" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">736.41</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0158484&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0158484</a>, <a href="https://bioportal.bioontology.org/search?q=C0576093&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0576093</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002857" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002857</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002857" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002857</a>]</span><br /> -
|
|
Madelung-like forearm deformities <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1851419&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1851419</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003068" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003068</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003068" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003068</a>]</span><br />
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</span>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<em> Feet </em>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<span class="mim-font">
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- Bilateral overriding of single toes <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1851426&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1851426</a>]</span><br />
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</span>
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</div>
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</div>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<strong> NEUROLOGIC </strong>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<div>
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<div>
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<span class="h5 mim-font">
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<em> Peripheral Nervous System </em>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<span class="mim-font">
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- Peripheral nerve compression <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1851414&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1851414</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003406" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003406</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003406" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003406</a>]</span><br /> -
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Cervical myelopathy <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/202664003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">202664003</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0149645&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0149645</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002318" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002318</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002318" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002318</a>]</span><br />
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</span>
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</div>
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</div>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<strong> NEOPLASIA </strong>
|
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</span>
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</div>
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<div style="margin-left: 2em;">
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<div>
|
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<span class="mim-font">
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|
|
- Increased risk of chondrosarcoma (mean age of onset 31 years) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1851417&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1851417</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">
|
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<strong> MISCELLANEOUS </strong>
|
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</span>
|
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</div>
|
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<div style="margin-left: 2em;">
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<div>
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<span class="mim-font">
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|
|
- More severe in males than in females<br /> -
|
|
Onset early childhood<br /> -
|
|
Lesions continue to grow until epiphyseal plate closure<br />
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|
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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> MOLECULAR BASIS </strong>
|
|
</span>
|
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</div>
|
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<div style="margin-left: 2em;">
|
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|
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<div>
|
|
<span class="mim-font">
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|
|
- Caused by mutation in the exostosin 1 gene (EXT1, <a href="/entry/608177#0001">608177.0001</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>
|
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</div>
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</div>
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</div>
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<div id="mimPhenotypicSeriesFold" class="well well-sm collapse mimSingletonToggleFold">
|
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<div class="small">
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<div class="row">
|
|
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
|
|
<h5>
|
|
Exostoses, multiple
|
|
- <a href="/phenotypicSeries/PS133700">PS133700</a>
|
|
- 3 Entries
|
|
</h5>
|
|
</div>
|
|
</div>
|
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|
|
<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/8/504?start=-3&limit=10&highlight=504"> 8q24.11 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/133700"> Exostoses, multiple, type 1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/133700"> 133700 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608177"> EXT1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608177"> 608177 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/11/328?start=-3&limit=10&highlight=328"> 11p11.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/133701"> Exostoses, multiple, type 2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/133701"> 133701 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608210"> EXT2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608210"> 608210 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/19/3?start=-3&limit=10&highlight=3"> 19p </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600209"> Exostoses, multiple, type 3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600209"> 600209 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600209"> EXT3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600209"> 600209 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="text-right small">
|
|
<a href="#mimPhenotypicSeriesFold" data-toggle="collapse">▲ Close</a>
|
|
</div>
|
|
</div>
|
|
</div>
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</div>
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<div>
|
|
<br />
|
|
</div>
|
|
|
|
|
|
|
|
<div>
|
|
<a id="text" class="mim-anchor"></a>
|
|
|
|
|
|
|
|
<h4 href="#mimTextFold" id="mimTextToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
|
|
<span id="mimTextToggleTriangle" class="small mimTextToggleTriangle">▼</span>
|
|
|
|
<span class="mim-font">
|
|
<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.">
|
|
<strong>TEXT</strong>
|
|
</span>
|
|
</span>
|
|
</h4>
|
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<div id="mimTextFold" class="collapse in ">
|
|
<span class="mim-text-font">
|
|
<p>A number sign (#) is used with this entry because multiple exostoses type I (EXT1) is caused by heterozygous mutation in the gene encoding exostosin-1 (EXT1; <a href="/entry/608177">608177</a>) on chromosome 8q24.</p>
|
|
</span>
|
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<div>
|
|
<br />
|
|
</div>
|
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</div>
|
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<div>
|
|
<a id="description" class="mim-anchor"></a>
|
|
<h4 href="#mimDescriptionFold" id="mimDescriptionToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
|
|
<span id="mimDescriptionToggleTriangle" class="small mimTextToggleTriangle">▼</span>
|
|
<span class="mim-font">
|
|
<strong>Description</strong>
|
|
</span>
|
|
</h4>
|
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</div>
|
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|
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<div id="mimDescriptionFold" class="collapse in ">
|
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<span class="mim-text-font">
|
|
<p>Multiple hereditary exostoses (EXT) is an autosomal dominant disorder characterized by multiple projections of bone capped by cartilage, most numerous in the metaphyses of long bones, but also occurring on the diaphyses of long bones. Flat bones, vertebrae, and the ribs may also be affected, but the skull is usually not involved. Deformity of the legs, forearms (resembling Madelung deformity), and hands is frequent (<a href="#32" class="mim-tip-reference" title="Peterson, H. A. <strong>Multiple hereditary osteochondromata.</strong> Clin. Orthop. 239: 222-230, 1989."None>Peterson, 1989</a>).</p><p>Two conditions in which multiple exostoses occur are metachondromatosis (<a href="/entry/156250">156250</a>) and the Langer-Giedion syndrome (LGS; <a href="/entry/150230">150230</a>); the latter condition is also known as trichorhinophalangeal syndrome type II. Furthermore, exostosis-like lesions occur with fibrodysplasia ossificans progressiva (FOP; <a href="/entry/135100">135100</a>), occipital horn syndrome (<a href="/entry/304150">304150</a>), and the adult stage of hereditary hypophosphatemia (see <a href="/entry/307800">307800</a>); these exostoses are located at sites of tendon and muscle attachment. A relatively rare variant of the supracondylar process, on the anteromedial surface of the distal humerus, can be confused with an exostosis; the variant is said to be present in about 1% of persons of European descent (<a href="#40" class="mim-tip-reference" title="Silverman, F. N. <strong>Caffey's Pediatric X-ray Diagnosis: An Integrated Imaging Approach. Vol. 1.</strong> Chicago: Year Book Med. Publ. (pub.) 1985. Pp. 433-434."None>Silverman, 1985</a>).</p><p><strong><em>Genetic Heterogeneity of Multiple Exostoses</em></strong></p><p>
|
|
Multiple exostoses type II (EXT2; <a href="/entry/133701">133701</a>) is caused by mutation in the EXT2 gene (<a href="/entry/608210">608210</a>) on chromosome 11p11. Multiple exostoses type III (EXT3; <a href="/entry/600209">600209</a>) has been mapped to a locus on chromosome 19.</p>
|
|
</span>
|
|
<div>
|
|
<br />
|
|
</div>
|
|
</div>
|
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<div>
|
|
<a id="clinicalFeatures" class="mim-anchor"></a>
|
|
<h4 href="#mimClinicalFeaturesFold" id="mimClinicalFeaturesToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
|
|
<span id="mimClinicalFeaturesToggleTriangle" class="small mimTextToggleTriangle">▼</span>
|
|
<span class="mim-font">
|
|
<strong>Clinical Features</strong>
|
|
</span>
|
|
</h4>
|
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</div>
|
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|
|
<div id="mimClinicalFeaturesFold" class="collapse in mimTextToggleFold">
|
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<span class="mim-text-font">
|
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<p><a href="#22" class="mim-tip-reference" title="Krooth, R. S., Macklin, M. T., Hilbish, T. F. <strong>Diaphysial aclasis (multiple exostoses) on Guam.</strong> Am. J. Hum. Genet. 13: 340-347, 1961.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/13754517/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">13754517</a>]" pmid="13754517">Krooth et al. (1961)</a> reported on a study of the families of 6 persons with diaphyseal aclasis (multiple exostoses). The families were Chamorros, a Micronesian people who live in the Mariana Islands. The frequency of diaphyseal aclasis in the Chamorros of Guam was estimated at 1 in 1,000. In the 21 Guam cases, the tumors were evident on inspection in all males but in only half the females. In a study of 56 patients, <a href="#41" class="mim-tip-reference" title="Solomon, L. <strong>Hereditary multiple exostosis.</strong> J. Bone Joint Surg. Br. 45: 292-304, 1963."None>Solomon (1963)</a> found a sex ratio of 1 and reported that two-thirds of the patients had an affected parent. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=13754517" 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="#42" class="mim-tip-reference" title="Solomon, L. <strong>Hereditary multiple exostosis.</strong> Am. J. Hum. Genet. 16: 351-363, 1964.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/14207550/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">14207550</a>]" pmid="14207550">Solomon (1964)</a> observed 1 family in which all 8 affected persons in 4 sibships of 3 generations showed exostoses on the bones of the hands and fingers with very few elsewhere. In no other patients of his study did the abnormality take this particular form. Other workers had found no correlation between members of the same family as to form and distribution of disease. <a href="#42" class="mim-tip-reference" title="Solomon, L. <strong>Hereditary multiple exostosis.</strong> Am. J. Hum. Genet. 16: 351-363, 1964.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/14207550/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">14207550</a>]" pmid="14207550">Solomon (1964)</a> suggested that the family he reported may suffer from a rare disorder due to a gene distinct from that causing most cases. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=14207550" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#46" class="mim-tip-reference" title="Wicklund, C. L., Pauli, R. M., Johnston, D., Hecht, J. T. <strong>Natural history study of hereditary multiple exostoses.</strong> Am. J. Med. Genet. 55: 43-46, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7702095/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7702095</a>] [<a href="https://doi.org/10.1002/ajmg.1320550113" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7702095">Wicklund et al. (1995)</a> conducted a retrospective review of 43 affected probands and 137 of their affected relatives. Penetrance appeared to be 100%. There was an excess of males within the entire affected population (104:76) and within identified probands (28:15). However, the male-to-female ratio was unskewed in nuclear families (probands, affected sibs, and parents). The excess of males appeared to be related to the fact that males have more severe and more frequent complications of EXT which do not have a primary genetic origin. Only 2.8% of the total affected population had experienced exostosis-related malignancy. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7702095" 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="#35" class="mim-tip-reference" title="Quirini, G. E., Meyer, J. R., Herman, M., Russell, E. J. <strong>Osteochondroma of the thoracic spine: an unusual cause of spinal cord compression.</strong> Am. J. Neuroradiol. 17: 961-964, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8733974/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8733974</a>]" pmid="8733974">Quirini et al. (1996)</a> described depression of the thoracic spinal cord in a 24-year-old male with a calcified osteochondroma contiguous with the upper endplate of T8. <a href="#10" class="mim-tip-reference" title="Del-Rio, R., Navarra, E., Ferrando, J., Mascaro, J. M. <strong>Multiple exostoses syndrome presenting as nail malalignment and longitudinal dystrophy of fingers. (Letter)</strong> Arch. Derm. 128: 1655-1656, 1992.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/1456767/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">1456767</a>] [<a href="https://doi.org/10.1001/archderm.1992.04530010091024" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="1456767">Del-Rio et al. (1992)</a> described a 14-year-old boy in whom multiple exostoses had an unusual feature: exostoses on the distal phalanges were associated with malalignment and longitudinal dystrophy of the fingernails. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=8733974+1456767" 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>Reviewing a large cohort of 175 multiple exostoses patients referred to them over a 40-year period (1955 to 1995), <a href="#25" class="mim-tip-reference" title="Legeai-Mallet, L., Munnich, A., Maroteaux, P., Le Merrer, M. <strong>Incomplete penetrance and expressivity skewing in hereditary multiple exostoses.</strong> Clin. Genet. 52: 12-16, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9272707/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9272707</a>] [<a href="https://doi.org/10.1111/j.1399-0004.1997.tb02508.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9272707">Legeai-Mallet et al. (1997)</a> found that 109 (62%) cases were familial and 66 (38%) were isolated. The disorder was consistently diagnosed before the age of 12 years, and the risk of malignancy, although increased, was modest (0.57%). The observation of 7 unaffected individuals (6 females, 1 male) with a family history and affected offspring supported the incomplete penetrance of the disorder. Moreover, the observation of an unequal sex ratio with a preponderance of males among the probands in this series (103 to 72, P less than 0.02) and in all reported series to date (198 to 133, P less than 0.001) gave support to the incomplete penetrance of EXT genes according to sex. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9272707" 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 2 large consanguineous Pakistani families with typical features of multiple hereditary exostoses and mutations in EXT1 (see <a href="/entry/608177#0010">608177.0010</a> and <a href="/entry/608177#0011">608177.0011</a>), <a href="#11" class="mim-tip-reference" title="Faiyaz-Ul-Haque, M., Ahmad, W., Zaidi, S. H. E., Hussain, S., Haque, S., Ahmad, M., Cohn, D. H., Tsui, L.-C. <strong>Novel mutations in the EXT1 gene in two consanguineous families affected with multiple hereditary exostoses (familial osteochondromatosis).</strong> Clin. Genet. 66: 144-151, 2004.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15253765/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15253765</a>] [<a href="https://doi.org/10.1111/j.1399-0004.2004.00275.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15253765">Faiyaz-Ul-Haque et al. (2004)</a> noted a previously unreported feature, bilateral overriding of single toes. No unaffected individuals had this feature, which was present at birth and allowed earlier diagnosis of the disorder. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15253765" 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="Fusco, C., Nardella, G., Fischetto, R., Copetti, M., Petracca, A., Annunziata, F., Augello, B., D'Asdia, M. C., Petrucci, S., Mattina, T., Rella, A., Cassina, M., and 10 others. <strong>Mutational spectrum and clinical signatures in 114 families with hereditary multiple properties of selected exostosin variants.</strong> Hum. Molec. Genet. 28: 2133-2142, 2019.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30806661/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30806661</a>] [<a href="https://doi.org/10.1093/hmg/ddz046" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="30806661">Fusco et al. (2019)</a> described 42 patients with EXT1. The most commonly affected bones with osteochondroma/exostoses were the long bones of the upper and lower limbs. The second most commonly affected bones were in the chest. The mean number of osteochondromas per patient was approximately 10. Females had more lesions in ribs and distal ulna compared to males, whereas males had more lesions in the feet. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30806661" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Risk of Malignant Change</em></strong></p><p>
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<a href="#45" class="mim-tip-reference" title="Voutsinas, S., Wynne-Davies, R. <strong>The infrequency of malignant disease in diaphyseal aclasis and neurofibromatosis.</strong> J. Med. Genet. 20: 345-349, 1983.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6417335/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6417335</a>] [<a href="https://doi.org/10.1136/jmg.20.5.345" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="6417335">Voutsinas and Wynne-Davies (1983)</a> suggested that the risk of malignant change in multiple exostoses is 0.5% (or 1.3% of those over 21 years). <a href="#27" class="mim-tip-reference" title="Matsuno, T., Ichioka, Y., Yagi, T., Ishii, S. <strong>Spindle-cell sarcoma in patients who have osteochondromatosis: a report of two cases.</strong> J. Bone Joint Surg. Am. 70: 137-141, 1988.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/2826487/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">2826487</a>]" pmid="2826487">Matsuno et al. (1988)</a> described a 19-year-old woman and a 29-year-old man with spindle-cell sarcoma as a complication of multiple exostoses. Both of the patients came from families with many affected members. <a href="#27" class="mim-tip-reference" title="Matsuno, T., Ichioka, Y., Yagi, T., Ishii, S. <strong>Spindle-cell sarcoma in patients who have osteochondromatosis: a report of two cases.</strong> J. Bone Joint Surg. Am. 70: 137-141, 1988.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/2826487/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">2826487</a>]" pmid="2826487">Matsuno et al. (1988)</a> stated that 20 to 50% of patients with multiple exostoses develop malignant change, as compared with 1 to 4% of persons with a solitary osteochondroma. That estimate of the frequency of malignant change may be abnormally high; the patients who get into trouble are those who come to medical attention. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=2826487+6417335" 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 review, <a href="#19" class="mim-tip-reference" title="Hennekam, R. C. M. <strong>Hereditary multiple exostoses.</strong> J. Med. Genet. 28: 262-266, 1991.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/1856833/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">1856833</a>] [<a href="https://doi.org/10.1136/jmg.28.4.262" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="1856833">Hennekam (1991)</a> noted that malignancies probably occur in about 0.5 to 2% of cases. He quoted <a href="#30" class="mim-tip-reference" title="Ochsner, P. E. <strong>Zum Problem der neoplastischen Entartung bei multipen kartilaginaren Exostosen.</strong> Z. Orthop. 116: 369-378, 1978.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/80065/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">80065</a>]" pmid="80065">Ochsner (1978)</a> who collected data on 59 patients with osteosarcoma in multiple exostoses. The mean age of onset of malignant degeneration was 31 years; it seldom occurred before the tenth or after the fiftieth year. The upper end of the femur and the pelvis were the main locations of exostoses, but they were also found in the shoulder girdle and the ribs. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=1856833+80065" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#32" class="mim-tip-reference" title="Peterson, H. A. <strong>Multiple hereditary osteochondromata.</strong> Clin. Orthop. 239: 222-230, 1989."None>Peterson (1989)</a> discussed the orthopedic management of multiple hereditary exostoses.</p>
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<p><a href="#7" class="mim-tip-reference" title="Buhler, E. M., Malik, N. J. <strong>The tricho-rhino-phalangeal syndrome(s): chromosome 8 long arm deletion: is there a shortest region of overlap between reported cases? TRP I and TRP II syndromes: are they separate entities? (Editorial)</strong> Am. J. Med. Genet. 19: 113-119, 1984.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6496563/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6496563</a>] [<a href="https://doi.org/10.1002/ajmg.1320190111" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="6496563">Buhler and Malik (1984)</a> suggested that the mutation of multiple exostoses may be on 8q in the region of 8q24.1. They noted that the multiple exostoses of the Langer-Giedion syndrome are indistinguishable from those of the isolated disorder and that at least 1 case of trichorhinophalangeal syndrome without multiple exostoses had been found to have deletion in this region (<a href="#16" class="mim-tip-reference" title="Hamers, A., Peeters, G., Jongbloet, P., Geraedts, J. <strong>Microcytogenetics of chromosome 8q.</strong> Poster presented at the 8th International Chromosome Conference, Lubeck, Germany 1983. Note: Abstract 2-8."None>Hamers et al., 1983</a>). <a href="#7" class="mim-tip-reference" title="Buhler, E. M., Malik, N. J. <strong>The tricho-rhino-phalangeal syndrome(s): chromosome 8 long arm deletion: is there a shortest region of overlap between reported cases? TRP I and TRP II syndromes: are they separate entities? (Editorial)</strong> Am. J. Med. Genet. 19: 113-119, 1984.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6496563/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6496563</a>] [<a href="https://doi.org/10.1002/ajmg.1320190111" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="6496563">Buhler and Malik (1984)</a> suggested that 2 closely linked loci may be situated at 8q24: 1 for type I trichorhinophalangeal syndrome (TRPS1; <a href="/entry/190350">190350</a>) and 1 for multiple exostoses, and both may be deleted in LGS. Mental retardation present in some cases of LGS may be the result of deletion of additional neighboring genetic material. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6496563" 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="#31" class="mim-tip-reference" title="Ogle, R. F., Dalzell, P., Turner, G., Wass, D., Yip, M.-Y. <strong>Multiple exostoses in a patient with t(8;11)(q24.11;p15.5).</strong> J. Med. Genet. 28: 881-883, 1991.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/1757967/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">1757967</a>] [<a href="https://doi.org/10.1136/jmg.28.12.881" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="1757967">Ogle et al. (1991)</a> observed multiple exostoses in association with a balanced reciprocal translocation between 8q and 11p. The breakpoint on chromosome 8 was at proximal 8q24.1 within the critical region reported for Langer-Giedion syndrome. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=1757967" 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="Cook, A., Raskind, W., Blanton, S. H., Pauli, R. M., Gregg, R. G., Francomano, C. A., Puffenberger, E., Conrad, E. U., Schmale, G., Schellenberg, G., Wijsman, E., Hecht, J. T., Wells, D., Wagner, M. J. <strong>Genetic heterogeneity in families with hereditary multiple exostoses.</strong> Am. J. Hum. Genet. 53: 71-79, 1993.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8317501/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8317501</a>]" pmid="8317501">Cook et al. (1993)</a> found evidence for linkage of EXT to highly informative, short tandem repeat (STR) markers in the 8q24.11-q24.13 region, with genetic heterogeneity. A model of heterogeneity with linkage of the disease locus to the STR markers in 70% of the families (with a 95% confidence interval of 26 to 96%) produced a maximum lod score of 8.11, with the most likely position of the locus between D8S85 and D8S199. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8317501" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Studying material from a patient with multiple exostoses and a translocation t(8;13) with a breakpoint at 8q23, <a href="#50" class="mim-tip-reference" title="Yoshiura, K., Inazawa, J., Koyama, K., Nakamura, Y., Niikawa, N. <strong>Mapping of the 8q23 translocation breakpoint of t(8;13) observed in a patient with multiple exostoses.</strong> Genes Chromosomes Cancer 9: 57-61, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7507701/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7507701</a>] [<a href="https://doi.org/10.1002/gcc.2870090110" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7507701">Yoshiura et al. (1994)</a> determined the order of 7 loci defined by cosmid clones by means of 2-color fluorescence in situ hybridization on elongated prophase chromosomes. They identified 2 flanking loci and by pulsed field gel electrophoresis with one of the flanking probes concluded that the probe lies less than 600 kb from the chromosomal breakpoint. <a href="#26" class="mim-tip-reference" title="Ludecke, H.-J., Wagner, M. J., Nardmann, J., La Pillo, B., Parrish, J. E., Willems, P. J., Haan, E. A., Frydman, M., Hamers, G. J. H., Wells, D. E., Horsthemke, B. <strong>Molecular dissection of a contiguous gene syndrome: localization of the genes involved in the Langer-Giedion syndrome.</strong> Hum. Molec. Genet. 4: 31-36, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7711731/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7711731</a>] [<a href="https://doi.org/10.1093/hmg/4.1.31" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7711731">Ludecke et al. (1995)</a> and <a href="#21" class="mim-tip-reference" title="Hou, J., Parrish, J., Ludecke, H.-J., Sapru, M., Wang, Y., Chen, W., Hill, A., Siegel-Bartelt, J., Northrup, H., Elder, F. F. B., Chinault, C., Horsthemke, B., Wagner, M. J., Wells, D. E. <strong>A 4-megabase YAC contig that spans the Langer-Giedion syndrome region on human chromosome 8q24.1: use in refining the location of the trichorhinophalangeal syndrome and multiple exostoses genes (TRPS1 and EXT1).</strong> Genomics 29: 87-97, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8530105/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8530105</a>] [<a href="https://doi.org/10.1006/geno.1995.1218" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8530105">Hou et al. (1995)</a> presented evidence that the Langer-Giedion syndrome is a true contiguous gene syndrome due to loss of functional copies of both the TRPS1 and the EXT1 gene and that the EXT1 gene is more than 1 Mb distal to the TRPS1 gene. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7711731+7507701+8530105" 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="#5" class="mim-tip-reference" title="Blanton, S. H., Hogue, D., Wagner, M., Wells, D., Young, I. D., Hecht, J. T. <strong>Hereditary multiple exostoses: confirmation of linkage to chromosomes 8 and 11.</strong> Am. J. Med. Genet. 62: 150-159, 1996.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8882395/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8882395</a>] [<a href="https://doi.org/10.1002/(SICI)1096-8628(19960315)62:2<150::AID-AJMG7>3.0.CO;2-#" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8882395">Blanton et al. (1996)</a> studied 12 large multigenerational EXT families and found that the disorder mapped to 8q24 (EXT1) in 6 and to 11p (EXT2) in 6. None of the families mapped to the chromosome 19 locus (EXT3). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8882395" 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 3 of 8 sporadic osteocartilaginous exostoses tumors, <a href="#28" class="mim-tip-reference" title="Mertens, F., Rydholm, A., Kreicbergs, A., Willen, H., Jonsson, K., Heim, S., Mitelman, F., Mandahl, N. <strong>Loss of chromosome band 8q24 in sporadic osteocartilaginous exostoses.</strong> Genes Chromosomes Cancer 9: 8-12, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7507706/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7507706</a>] [<a href="https://doi.org/10.1002/gcc.2870090103" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7507706">Mertens et al. (1994)</a> found structural chromosomal rearrangements leading to loss of chromosome 8q24.1. The authors noted that multiple exostoses are part of the disease phenotype in patients with autosomal dominant LGS, many of whom have constitutional loss of genetic material from 8q24.1. <a href="#28" class="mim-tip-reference" title="Mertens, F., Rydholm, A., Kreicbergs, A., Willen, H., Jonsson, K., Heim, S., Mitelman, F., Mandahl, N. <strong>Loss of chromosome band 8q24 in sporadic osteocartilaginous exostoses.</strong> Genes Chromosomes Cancer 9: 8-12, 1994.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7507706/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7507706</a>] [<a href="https://doi.org/10.1002/gcc.2870090103" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7507706">Mertens et al. (1994)</a> postulated the existence of a gene which carries a mutant allele that is inherited in the familial form of multiple exostoses and leads to the development of exostosis when a second mutation occurs as a somatic event in the other chromosome. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7507706" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#34" class="mim-tip-reference" title="Pramparo, T., Gregato, G., De Gregori, M., Friso, A., Clementi, M., Ardenghi, P., Rocchi, M., Zuffardi, O., Tenconi, R. <strong>Reciprocal translocation associated with multiple exostoses in seven members of a three generation family and discovered through an infertile male.</strong> Am. J. Med. Genet. 123A: 79-83, 2003.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/14556251/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">14556251</a>] [<a href="https://doi.org/10.1002/ajmg.a.20498" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="14556251">Pramparo et al. (2003)</a> reported a family with multiple exostoses segregating with a reciprocal translocation, t(8;19)(q24.11;q13.13), in 8 members of 3 generations. FISH investigations detected a breakage of the dosage-sensitive EXT1 gene. Although 3 members of the family died perinatally from unknown causes and 1 carrier had 4 spontaneous abortions, the translocation was found only when a cytogenetic analysis was requested in an affected male because of oligozoospermia. <a href="#34" class="mim-tip-reference" title="Pramparo, T., Gregato, G., De Gregori, M., Friso, A., Clementi, M., Ardenghi, P., Rocchi, M., Zuffardi, O., Tenconi, R. <strong>Reciprocal translocation associated with multiple exostoses in seven members of a three generation family and discovered through an infertile male.</strong> Am. J. Med. Genet. 123A: 79-83, 2003.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/14556251/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">14556251</a>] [<a href="https://doi.org/10.1002/ajmg.a.20498" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="14556251">Pramparo et al. (2003)</a> noted that infertile males may be carriers of reciprocal or Robertsonian translocations with a higher frequency than the general population. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=14556251" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Locus Heterogeneity</em></strong></p><p>
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<a href="#15" class="mim-tip-reference" title="Hall, J. G., Wilson, R. D., Kalousek, D., Beauchamp, R. <strong>Familial multiple exostoses--no chromosome 8 deletion observed.</strong> Am. J. Med. Genet. 22: 639-640, 1985.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/4061499/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">4061499</a>] [<a href="https://doi.org/10.1002/ajmg.1320220328" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="4061499">Hall et al. (1985)</a> could find no abnormality of 8q in cells cultured from an exostosis. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=4061499" 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>Using probe L48 at locus D8S51, <a href="#23" class="mim-tip-reference" title="Le Merrer, M., Ben Othmane, K., Stanescu, V., Lyonnet, S., Van Maldergem, L., Royer, G., Munnich, A., Maroteaux, P. <strong>The gene for hereditary multiple exostoses does not map to the Langer-Giedion region (8q23-q24).</strong> J. Med. Genet. 29: 713-715, 1992.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/1433231/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">1433231</a>] [<a href="https://doi.org/10.1136/jmg.29.10.713" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="1433231">Le Merrer et al. (1992)</a> excluded the EXT gene from the 8q24.1 region. The cumulative lod score was -8.96 at theta = 0. In an addendum they stated that the testing of 3 additional families brought the lod score with probe L48 to -18.32 at theta = 0. In 2 Dutch EXT pedigrees with a total of 22 affected persons, <a href="#3" class="mim-tip-reference" title="Bakker, E., Smoor, M. A., Maat, A., van Haeringen, A., van de Kamp, J. J. P., van Ommen, G. J. B. <strong>Hereditary multiple exostoses in two Dutch families, LGS region excluded. (Abstract)</strong> Human Genome Mapping Workshop 93, Kobe, Japan 1993. P. 15."None>Bakker et al. (1993)</a> excluded linkage to the 8q22-q24 region, indicating genetic heterogeneity. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=1433231" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#24" class="mim-tip-reference" title="Legeai-Mallet, L., Margaritte-Jeannin, P., Lemdani, M., Le Merrer, M., Plauchu, H., Maroteaux, P., Munnich, A., Clerget-Darpoux, F. <strong>An extension of the admixture test for the study of genetic heterogeneity in hereditary multiple exostoses.</strong> Hum. Genet. 99: 298-302, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9050912/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9050912</a>] [<a href="https://doi.org/10.1007/s004390050361" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9050912">Legeai-Mallet et al. (1997)</a> tested a series of 29 EXT families for possible linkage to the 3 known disease loci and estimated the probability of linkage of the disease to each locus by using an extension of the admixture test, which made modeling of heterogeneous monogenic disease feasible. A maximum likelihood was obtained for proportions of 44%, 28%, and 28% of families being linked to chromosomes 8, 11, and 19, respectively. No evidence of a fourth locus for the disease was found. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9050912" 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="Francannet, C., Cohen-Tanugi, A., Le Merrer, M., Munnich, A., Bonaventure, J., Legeai-Mallet, L. <strong>Genotype-phenotype correlation in hereditary multiple exostoses.</strong> J. Med. Genet. 38: 430-434, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11432960/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11432960</a>] [<a href="https://doi.org/10.1136/jmg.38.7.430" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11432960">Francannet et al. (2001)</a> reported a clinical and molecular study of 42 French families representing 217 affected individuals with multiple exostoses. Based on age of onset, number and location of exostoses, stature, and functional rating, they divided the affected individuals into those with a severe phenotype ('S') and those with a moderate phenotype ('M'). Seven of the 42 families belonged to group M, while the remaining 35 belonged to group S. Chondrosarcoma was found in 9 patients from 7 pedigrees, all of whom had type S. There was intrafamilial variability in severity of phenotype, and 4 families showed evidence of anticipation. The authors confirmed linkage to EXT1 in 29 of the families, to EXT2 in 9, and to EXT3 in 1. <a href="#12" class="mim-tip-reference" title="Francannet, C., Cohen-Tanugi, A., Le Merrer, M., Munnich, A., Bonaventure, J., Legeai-Mallet, L. <strong>Genotype-phenotype correlation in hereditary multiple exostoses.</strong> J. Med. Genet. 38: 430-434, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11432960/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11432960</a>] [<a href="https://doi.org/10.1136/jmg.38.7.430" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11432960">Francannet et al. (2001)</a> concluded that there must be at least 1 additional locus for the multiple exostoses phenotype to account for the 3 unlinked families. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11432960" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>In 2 of 23 unrelated families with multiple exostoses type I, <a href="#1" class="mim-tip-reference" title="Ahn, J., Ludecke, H.-J., Lindow, S., Horton, W. A., Lee, B., Wagner, M. J., Horsthemke, B., Wells, D. E. <strong>Cloning of the putative tumour suppressor gene for hereditary multiple exostoses (EXT1).</strong> Nature Genet. 11: 137-143, 1995.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7550340/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7550340</a>] [<a href="https://doi.org/10.1038/ng1095-137" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="7550340">Ahn et al. (1995)</a> identified a 1-bp deletion in the EXT1 gene (<a href="/entry/608177#0001">608177.0001</a>) that segregated with the disease. In 4 of 6 EXT families demonstrating linkage to the EXT1 locus on chromosome 8, <a href="#17" class="mim-tip-reference" title="Hecht, J. T., Hogue, D., Wang, Y., Blanton, S. H., Wagner, M., Strong, L. C., Raskind, W., Hansen, M. F., Wells, D. <strong>Hereditary multiple exostoses (EXT): mutational studies of familial EXT1 cases and EXT-associated malignancies.</strong> Am. J. Hum. Genet. 60: 80-86, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8981950/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8981950</a>]" pmid="8981950">Hecht et al. (1997)</a> identified 3 germline mutations in the EXT1 gene that segregated with the disease phenotype in each family (<a href="/entry/608177#0002">608177.0002</a>-<a href="/entry/608177#0004">608177.0004</a>). In 7 of 17 families (41%) with EXT, <a href="#33" class="mim-tip-reference" title="Philippe, C., Porter, D. E., Emerton, M. E., Wells, D. E., Simpson, A. H. R. W., Monaco, A. P. <strong>Mutation screening of the EXT1 and EXT2 genes in patients with hereditary multiple exostoses.</strong> Am. J. Hum. Genet. 61: 520-528, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9326317/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9326317</a>] [<a href="https://doi.org/10.1086/515505" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9326317">Philippe et al. (1997)</a> identified mutations in the EXT1 gene, including 5 novel mutations (see, e.g., <a href="/entry/608177#0007">608177.0007</a> and <a href="/entry/608177#0009">608177.0009</a>). Five of the families (29%) had mutations in the EXT2 gene. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7550340+8981950+9326317" 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="#47" class="mim-tip-reference" title="Wuyts, W., Van Hul, W., De Boulle, K., Hendrickx, J., Bakker, E., Vanhoenacker, F., Mollica, F., Ludecke, H.-J., Sayli, B. S., Pazzaglia, U. E., Mortier, G., Hamel, B., Conrad, E. U., Matsushita, M., Raskind, W. H., Willems, P. J. <strong>Mutations in the EXT1 and EXT2 genes in hereditary multiple exostoses.</strong> Am. J. Hum. Genet. 62: 346-354, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9463333/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9463333</a>] [<a href="https://doi.org/10.1086/301726" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9463333">Wuyts et al. (1998)</a> analyzed the EXT1 and EXT2 genes in 26 EXT families originating from 9 countries. Of the 26 families, 10 had an EXT1 mutation and 10 had an EXT2 mutation. Twelve of these mutations had not previously been described. From a review of these and previously reported mutations, <a href="#47" class="mim-tip-reference" title="Wuyts, W., Van Hul, W., De Boulle, K., Hendrickx, J., Bakker, E., Vanhoenacker, F., Mollica, F., Ludecke, H.-J., Sayli, B. S., Pazzaglia, U. E., Mortier, G., Hamel, B., Conrad, E. U., Matsushita, M., Raskind, W. H., Willems, P. J. <strong>Mutations in the EXT1 and EXT2 genes in hereditary multiple exostoses.</strong> Am. J. Hum. Genet. 62: 346-354, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9463333/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9463333</a>] [<a href="https://doi.org/10.1086/301726" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9463333">Wuyts et al. (1998)</a> concluded that mutations in either the EXT1 or the EXT2 gene are responsible for most cases of multiple exostoses. Most of the mutations in these 2 genes cause premature termination of the EXT proteins, whereas missense mutations are rare. The development of exostoses is, therefore, mainly due to loss of function of EXT genes, consistent with the hypothesis that the EXT genes have a tumor suppressor function. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9463333" 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 23 of 43 Japanese families examined, <a href="#37" class="mim-tip-reference" title="Seki, H., Kubota, T., Ikegawa, S., Haga, N., Fujioka, F., Ohzeki, S., Wakui, K., Yoshikawa, H., Takaoka, K., Fukushima, Y. <strong>Mutation frequencies of EXT1 and EXT2 in 43 Japanese families with hereditary multiple exostoses.</strong> Am. J. Med. Genet. 99: 59-62, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11170095/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11170095</a>] [<a href="https://doi.org/10.1002/1096-8628(20010215)99:1<59::aid-ajmg1115>3.0.co;2-z" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11170095">Seki et al. (2001)</a> found 21 mutations, of which 18 were novel. Seventeen (40%) of the 23 families had a mutation in EXT1 and 6 (14%) had a mutation in EXT2. Of the 17 families with EXT1 mutations, 13 had those causing premature termination of the EXT1 protein, and 4 showed missense mutations. In contrast to the findings of <a href="#37" class="mim-tip-reference" title="Seki, H., Kubota, T., Ikegawa, S., Haga, N., Fujioka, F., Ohzeki, S., Wakui, K., Yoshikawa, H., Takaoka, K., Fukushima, Y. <strong>Mutation frequencies of EXT1 and EXT2 in 43 Japanese families with hereditary multiple exostoses.</strong> Am. J. Med. Genet. 99: 59-62, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11170095/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11170095</a>] [<a href="https://doi.org/10.1002/1096-8628(20010215)99:1<59::aid-ajmg1115>3.0.co;2-z" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11170095">Seki et al. (2001)</a>, <a href="#49" class="mim-tip-reference" title="Xu, L., Xia, J., Jiang, H., Zhou, J., Li, H., Wang, D., Pan, Q., Long, Z., Fan, C., Deng, H.-X. <strong>Mutation analysis of hereditary multiple exostoses in the Chinese.</strong> Hum. Genet. 105: 45-50, 1999.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10480354/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10480354</a>] [<a href="https://doi.org/10.1007/s004399900058" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10480354">Xu et al. (1999)</a> detected more mutations in EXT2 than in EXT1 in Chinese patients (33% and 14%, respectively). An excess of EXT1 mutations was found in Caucasian patients, however, by <a href="#33" class="mim-tip-reference" title="Philippe, C., Porter, D. E., Emerton, M. E., Wells, D. E., Simpson, A. H. R. W., Monaco, A. P. <strong>Mutation screening of the EXT1 and EXT2 genes in patients with hereditary multiple exostoses.</strong> Am. J. Hum. Genet. 61: 520-528, 1997.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9326317/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9326317</a>] [<a href="https://doi.org/10.1086/515505" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9326317">Philippe et al. (1997)</a> and <a href="#47" class="mim-tip-reference" title="Wuyts, W., Van Hul, W., De Boulle, K., Hendrickx, J., Bakker, E., Vanhoenacker, F., Mollica, F., Ludecke, H.-J., Sayli, B. S., Pazzaglia, U. E., Mortier, G., Hamel, B., Conrad, E. U., Matsushita, M., Raskind, W. H., Willems, P. J. <strong>Mutations in the EXT1 and EXT2 genes in hereditary multiple exostoses.</strong> Am. J. Hum. Genet. 62: 346-354, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9463333/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9463333</a>] [<a href="https://doi.org/10.1086/301726" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9463333">Wuyts et al. (1998)</a>. In both Caucasian patients, as studied by <a href="#36" class="mim-tip-reference" title="Raskind, W. H., Conrad, E. U., III, Matsushita, M., Wijsman, E. M., Wells, D. E., Chapman, N., Sandell, L. J., Wagner, M., Houck, J. <strong>Evaluation of locus heterogeneity and EXT1 mutations in 34 families with hereditary multiple exostoses.</strong> Hum. Mutat. 11: 231-239, 1998.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9521425/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9521425</a>] [<a href="https://doi.org/10.1002/(SICI)1098-1004(1998)11:3<231::AID-HUMU8>3.0.CO;2-K" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="9521425">Raskind et al. (1998)</a>, and Japanese patients, more EXT1 mutations were identified in familial cases than in sporadic cases. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=9326317+10480354+11170095+9463333+9521425" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In a study of 82 Japanese patients with hereditary multiple exostoses by <a href="#37" class="mim-tip-reference" title="Seki, H., Kubota, T., Ikegawa, S., Haga, N., Fujioka, F., Ohzeki, S., Wakui, K., Yoshikawa, H., Takaoka, K., Fukushima, Y. <strong>Mutation frequencies of EXT1 and EXT2 in 43 Japanese families with hereditary multiple exostoses.</strong> Am. J. Med. Genet. 99: 59-62, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11170095/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11170095</a>] [<a href="https://doi.org/10.1002/1096-8628(20010215)99:1<59::aid-ajmg1115>3.0.co;2-z" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11170095">Seki et al. (2001)</a>, 4 patients developed malignancy and their mutations (3 in EXT1 and 1 in EXT2) were all different, suggesting that malignant transformation is not directly related to a particular mutation in EXT1 or EXT2, but more likely involves other genetic factors. Loss of heterozygosity has been detected in chondrosarcoma not only at the EXT loci but also at others such as 10q (RET; <a href="/entry/164761">164761</a>) and 3q. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11170095" 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="#48" class="mim-tip-reference" title="Wuyts, W., Van Hul, W. <strong>Molecular basis of multiple exostoses: mutations in the EXT1 and EXT2 genes.</strong> Hum. Mutat. 15: 220-227, 2000.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10679937/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10679937</a>] [<a href="https://doi.org/10.1002/(SICI)1098-1004(200003)15:3<220::AID-HUMU2>3.0.CO;2-K" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="10679937">Wuyts and Van Hul (2000)</a> stated that to date, 49 different EXT1 and 25 different EXT2 mutations had been identified in patients with multiple exostoses, and that mutations in these 2 genes were responsible for over 70% of the EXT cases. The variety of mutations in each gene was detailed. Most of the mutations caused loss of function, which is consistent with the presumed tumor suppressor function of the EXT genes. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10679937" 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 79 unrelated Italian patients with multiple exostoses type I, <a href="#13" class="mim-tip-reference" title="Fusco, C., Nardella, G., Fischetto, R., Copetti, M., Petracca, A., Annunziata, F., Augello, B., D'Asdia, M. C., Petrucci, S., Mattina, T., Rella, A., Cassina, M., and 10 others. <strong>Mutational spectrum and clinical signatures in 114 families with hereditary multiple properties of selected exostosin variants.</strong> Hum. Molec. Genet. 28: 2133-2142, 2019.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30806661/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30806661</a>] [<a href="https://doi.org/10.1093/hmg/ddz046" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="30806661">Fusco et al. (2019)</a> identified 62 different heterozygous mutations in the EXT1 gene, of which 36 were novel. The mutations were identified by direct sequencing or by MLPA analysis followed by confirmation with quantitative real-time PCR. The mutations included 23 frameshift, 22 nonsense, 6 missense, 9 splicing, and 2 intragenic rearrangements. The most common mutation was R340H (<a href="/entry/608177#0013">608177.0013</a>), which occurred in 5 families. To evaluate the functional importance of EXT1 domains, <a href="#13" class="mim-tip-reference" title="Fusco, C., Nardella, G., Fischetto, R., Copetti, M., Petracca, A., Annunziata, F., Augello, B., D'Asdia, M. C., Petrucci, S., Mattina, T., Rella, A., Cassina, M., and 10 others. <strong>Mutational spectrum and clinical signatures in 114 families with hereditary multiple properties of selected exostosin variants.</strong> Hum. Molec. Genet. 28: 2133-2142, 2019.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30806661/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30806661</a>] [<a href="https://doi.org/10.1093/hmg/ddz046" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="30806661">Fusco et al. (2019)</a> tested the effects of 2 truncating mutations (C355S and Leu427Argfs14), comprising the N-terminal domain or glycosyltransferase 64 C-terminal domain, in U2OS cells. The mutated proteins had abnormal localization in the cell. These mutant EXT1 proteins were also expressed in HEK293 cells, which showed slower growth compared to cells expressing wildtype EXT1. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30806661" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>In 36 of 38 EXT families linked to EXT1 or EXT2, <a href="#12" class="mim-tip-reference" title="Francannet, C., Cohen-Tanugi, A., Le Merrer, M., Munnich, A., Bonaventure, J., Legeai-Mallet, L. <strong>Genotype-phenotype correlation in hereditary multiple exostoses.</strong> J. Med. Genet. 38: 430-434, 2001.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11432960/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11432960</a>] [<a href="https://doi.org/10.1136/jmg.38.7.430" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="11432960">Francannet et al. (2001)</a> identified mutations: 27 were located in EXT1 and were almost randomly distributed over the 9 exons; 90% caused premature termination of the EXT1 protein. Nineteen of the EXT1 mutations were novel. No mutations were found in 2 EXT1-linked families. A more severe phenotype ('S') was shown to be significantly associated with EXT1 mutations, while a more moderate phenotype ('M') was associated with EXT2 mutations. One subgroup of the S phenotype, IS (10 to 25 exostoses, no vertebral exostoses, height below the 10th centile), was associated with mutations in EXT1 or EXT2. Mutations associated with another subgroup, IVS (very short stature), were located in exon 1 of EXT1. Chondrosarcomas were found only in patients with EXT1 mutations. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11432960" 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 7 patients with EXT1 mutations and 16 patients with EXT2 mutations, <a href="#2" class="mim-tip-reference" title="Alvarez, C., Tredwell, S., De Vera, M., Hayden, M. <strong>The genotype-phenotype correlation of hereditary multiple exostoses.</strong> Clin. Genet. 70: 122-130, 2006.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16879194/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16879194</a>] [<a href="https://doi.org/10.1111/j.1399-0004.2006.00653.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="16879194">Alvarez et al. (2006)</a> analyzed the anatomic burden of disease by clinical and radiographic examination and evaluation of 76 phenotypic parameters. Patients with EXT1 mutation were found to have more exostoses, more limb malalignment with shorter limb segments and height, and more pelvic and flatbone involvement. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16879194" 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 11 of 23 German patients with multiple exostoses, <a href="#18" class="mim-tip-reference" title="Heinritz, W., Huffmeier, U., Strenge, S., Miterski, B., Zweier, C., Leinung, S., Bohring, A., Mitulla, B., Peters, U., Froster, U. G. <strong>New mutations of EXT1 and EXT2 genes in German patients with multiple osteochondromas.</strong> Ann. Hum. Genet. 73: 283-291, 2009.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19344451/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19344451</a>] [<a href="https://doi.org/10.1111/j.1469-1809.2009.00508.x" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="19344451">Heinritz et al. (2009)</a> identified 11 different novel mutations in the EXT1 gene (see, e.g., <a href="/entry/608177#0012">608177.0012</a>). Eleven patients had mutations in the EXT2 gene, and 1 patient had no detectable mutations. Multiple splice site defects were identified. Although clinical details were limited, those with EXT1 mutations tended to have a more severe phenotype. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=19344451" 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="Fusco, C., Nardella, G., Fischetto, R., Copetti, M., Petracca, A., Annunziata, F., Augello, B., D'Asdia, M. C., Petrucci, S., Mattina, T., Rella, A., Cassina, M., and 10 others. <strong>Mutational spectrum and clinical signatures in 114 families with hereditary multiple properties of selected exostosin variants.</strong> Hum. Molec. Genet. 28: 2133-2142, 2019.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30806661/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30806661</a>] [<a href="https://doi.org/10.1093/hmg/ddz046" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="30806661">Fusco et al. (2019)</a> described genotype/phenotype correlations for 42 Italian patients with EXT1 and 27 Italian patients with EXT2. The patients included 38 females and 31 males, ranging in age from 4 to 74 years. There were no significant differences for age and sex between the EXT1 and EXT2 groups. The long bones of the upper and lower limbs were the most commonly affected bones with osteochondroma/exostoses. The second most commonly affected bones were the chest bones. Occasional vertebral osteochondroma/exostoses were identified in EXT1 patients, whereas none were identified in EXT2 patients. Impaired intellectual development was reported in 2 patients with EXT1, both of whom had a heterozygous nonsense variant in EXT1 (Q213X and C355X). The average number of total osteochondromas was approximately 10 in patients with EXT1 and approximately 7 in patients with EXT2. Osteochondroma/exostoses were more frequently reported in the distal humerus, distal ulna, ribs, proximal humerus, and distal radius in patients with EXT1 compared to patients with EXT2. Males with EXT1 had more total osteochondromas compared to males with EXT2, and more specifically had more osteochondromas in the distal humerus, distal ulna, ribs, and hands. The overall number of osteochondromas was comparable between females with EXT1 and EXT2. However, more osteochondromas were observed in the distal humerus and distal radius in females with EXT1 and in the proximal humerus in females with EXT2. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30806661" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#4" class="mim-tip-reference" title="Beighton, P., Sujansky, E., Patzak, B., Portele, K. A. <strong>Genetic skeletal dysplasias in the Museum of Pathological Anatomy, Vienna.</strong> Am. J. Med. Genet. 47: 843-847, 1993.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8279481/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8279481</a>] [<a href="https://doi.org/10.1002/ajmg.1320470609" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8279481">Beighton et al. (1993)</a> analyzed the skeletons of adults in the Museum of Pathological Anatomy in Vienna. The museum was established in 1796 by Emperor Franz I, and is now housed in the Narrenturm, which is situated on the grounds of the Altes Allgemeines Krankenhaus, formerly a facility for the custodial care of persons with insanity. The museum contains 44,000 specimens. <a href="#4" class="mim-tip-reference" title="Beighton, P., Sujansky, E., Patzak, B., Portele, K. A. <strong>Genetic skeletal dysplasias in the Museum of Pathological Anatomy, Vienna.</strong> Am. J. Med. Genet. 47: 843-847, 1993.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8279481/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8279481</a>] [<a href="https://doi.org/10.1002/ajmg.1320470609" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="8279481">Beighton et al. (1993)</a> pictured the skeleton of a man with multiple exostoses who died in 1842 of ruptured aortic aneurysm (probably syphilitic). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8279481" 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="#Brooks1980" class="mim-tip-reference" title="Brooks, A. P., Wynne-Davies, R. <strong>A family with diaphyseal aclasis and peripheral dysostosis.</strong> J. Med. Genet. 17: 277-280, 1980.">Brooks and Wynne-Davies (1980)</a>; <a href="#Buur1983" class="mim-tip-reference" title="Buur, T., Morch, M. M. <strong>Hereditary multiple exostoses with spinal cord compression. (Letter)</strong> J. Neurol. Neurosurg. Psychiat. 46: 96-98, 1983.">Buur and Morch (1983)</a>; <a href="#Gardner1975" class="mim-tip-reference" title="Gardner, E. J., Shupe, J. L., Leone, N. C., Olson, A. E. <strong>Hereditary multiple exostosis: a comparative genetic evaluation in man and horses.</strong> J. Hered. 66: 318-322, 1975.">Gardner et al.
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<span class="mim-font">
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<span id="mimReferencesToggleTriangle" class="small mimTextToggleTriangle">▼</span>
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<strong>REFERENCES</strong>
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</h4>
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[<a href="https://doi.org/10.1111/j.1399-0004.2006.00653.x" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1002/ajmg.1320470609" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1002/(SICI)1096-8628(19960315)62:2<150::AID-AJMG7>3.0.CO;2-#" target="_blank">Full Text</a>]
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<a id="Brooks1980" class="mim-anchor"></a>
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Brooks, A. P., Wynne-Davies, R.
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[<a href="https://doi.org/10.1136/jmg.17.4.277" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1002/ajmg.1320190111" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jnnp.46.1.96-a" target="_blank">Full Text</a>]
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<a id="Cook1993" class="mim-anchor"></a>
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Cook, A., Raskind, W., Blanton, S. H., Pauli, R. M., Gregg, R. G., Francomano, C. A., Puffenberger, E., Conrad, E. U., Schmale, G., Schellenberg, G., Wijsman, E., Hecht, J. T., Wells, D., Wagner, M. J.
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[<a href="https://doi.org/10.1001/archderm.1992.04530010091024" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1111/j.1399-0004.2004.00275.x" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jmg.38.7.430" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1093/hmg/ddz046" target="_blank">Full Text</a>]
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<a id="Gardner1975" class="mim-anchor"></a>
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<div class="">
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<p class="mim-text-font">
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Gardner, E. J., Shupe, J. L., Leone, N. C., Olson, A. E.
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<strong>Hereditary multiple exostosis: a comparative genetic evaluation in man and horses.</strong>
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[<a href="https://doi.org/10.1093/oxfordjournals.jhered.a108640" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1002/ajmg.1320220328" target="_blank">Full Text</a>]
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<a id="Hamers1983" class="mim-anchor"></a>
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<div class="">
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[<a href="https://doi.org/10.1111/j.1469-1809.2009.00508.x" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jmg.28.4.262" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1001/archneur.1979.00500470084018" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jmg.29.10.713" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1007/s004390050361" target="_blank">Full Text</a>]
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/14556251/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">14556251</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=14556251" 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.a.20498" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1002/(SICI)1098-1004(1998)11:3<231::AID-HUMU8>3.0.CO;2-K" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1002/1096-8628(20010215)99:1<59::aid-ajmg1115>3.0.co;2-z" target="_blank">Full Text</a>]
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5314313/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5314313</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=5314313" 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/10.2214/ajr.112.2.405" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jmg.20.5.345" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1002/ajmg.1320550113" target="_blank">Full Text</a>]
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9463333/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9463333</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9463333" 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/10.1086/301726" target="_blank">Full Text</a>]
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10679937/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10679937</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10679937" 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/(SICI)1098-1004(200003)15:3<220::AID-HUMU2>3.0.CO;2-K" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1007/s004399900058" target="_blank">Full Text</a>]
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<a id="Yoshiura1994" class="mim-anchor"></a>
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<div class="">
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Yoshiura, K., Inazawa, J., Koyama, K., Nakamura, Y., Niikawa, N.
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<strong>Mapping of the 8q23 translocation breakpoint of t(8;13) observed in a patient with multiple exostoses.</strong>
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7507701/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7507701</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7507701" 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/gcc.2870090110" target="_blank">Full Text</a>]
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<br />
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<a id="contributors" class="mim-anchor"></a>
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<span class="mim-text-font">
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<a href="#mimCollapseContributors" role="button" data-toggle="collapse"> Contributors: </a>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
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<span class="mim-text-font">
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Hilary J. Vernon - updated : 11/06/2020
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<div class="row collapse" id="mimCollapseContributors">
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<div class="col-lg-offset-2 col-md-offset-4 col-sm-offset-4 col-xs-offset-2 col-lg-6 col-md-6 col-sm-6 col-xs-6">
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<span class="mim-text-font">
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Cassandra L. Kniffin - updated : 11/10/2009<br>Marla J. F. O'Neill - updated : 9/22/2006<br>Marla J. F. O'Neill - updated : 4/20/2005<br>Victor A. McKusick - updated : 1/20/2004<br>Cassandra L. Kniffin - reorganized : 10/30/2003<br>Victor A. McKusick - updated : 10/7/2002<br>Michael J. Wright - updated : 10/5/2001<br>Victor A. McKusick - updated : 9/4/2001<br>Victor A. McKusick - updated : 2/21/2001<br>Victor A. McKusick - updated : 4/18/2000<br>Victor A. McKusick - updated : 2/9/2000<br>Victor A. McKusick - updated : 9/24/1999<br>Victor A. McKusick - updated : 4/18/1998<br>Victor A. McKusick - updated : 3/26/1998<br>Rebekah S. Rasooly - updated : 3/7/1998<br>Victor A. McKusick - updated : 10/6/1997<br>Victor A. McKusick - updated : 9/3/1997<br>Victor A. McKusick - updated : 7/14/1997<br>Victor A. McKusick - updated : 5/16/1997<br>Victor A. McKusick - updated : 3/4/1997<br>Moyra Smith - updated : 1/27/1997
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Creation Date:
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<span class="mim-text-font">
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Victor A. McKusick : 6/4/1986
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<a href="#mimCollapseEditHistory" role="button" data-toggle="collapse"> Edit History: </a>
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carol : 11/06/2020
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carol : 04/30/2019<br>carol : 04/29/2019<br>carol : 08/19/2016<br>mcolton : 03/04/2015<br>carol : 6/1/2011<br>terry : 1/13/2011<br>wwang : 12/8/2009<br>ckniffin : 11/10/2009<br>wwang : 9/22/2006<br>carol : 9/1/2005<br>terry : 4/20/2005<br>tkritzer : 1/20/2004<br>carol : 10/30/2003<br>ckniffin : 10/29/2003<br>carol : 2/27/2003<br>carol : 10/8/2002<br>tkritzer : 10/7/2002<br>terry : 10/7/2002<br>cwells : 10/9/2001<br>cwells : 10/5/2001<br>alopez : 9/7/2001<br>terry : 9/4/2001<br>carol : 4/2/2001<br>carol : 4/2/2001<br>mcapotos : 3/13/2001<br>carol : 2/28/2001<br>cwells : 2/27/2001<br>terry : 2/21/2001<br>terry : 4/18/2000<br>mgross : 3/1/2000<br>terry : 2/9/2000<br>alopez : 10/26/1999<br>terry : 9/24/1999<br>terry : 4/30/1999<br>dkim : 12/18/1998<br>alopez : 6/1/1998<br>terry : 5/27/1998<br>alopez : 5/14/1998<br>joanna : 5/13/1998<br>carol : 4/18/1998<br>terry : 4/6/1998<br>psherman : 3/31/1998<br>terry : 3/26/1998<br>carol : 3/7/1998<br>joanna : 2/23/1998<br>mark : 10/9/1997<br>terry : 10/6/1997<br>terry : 9/15/1997<br>terry : 9/8/1997<br>terry : 9/8/1997<br>terry : 9/3/1997<br>dholmes : 8/14/1997<br>mark : 8/12/1997<br>mark : 8/12/1997<br>terry : 8/11/1997<br>terry : 8/8/1997<br>terry : 7/14/1997<br>terry : 5/27/1997<br>terry : 5/27/1997<br>terry : 5/16/1997<br>mark : 3/4/1997<br>terry : 3/3/1997<br>terry : 1/27/1997<br>mark : 1/25/1997<br>mark : 4/25/1996<br>terry : 4/18/1996<br>mark : 12/11/1995<br>mark : 12/11/1995<br>mark : 12/11/1995<br>mark : 10/10/1995<br>mimadm : 9/24/1994<br>davew : 7/20/1994<br>jason : 6/8/1994<br>warfield : 4/20/1994<br>pfoster : 4/4/1994
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<strong>#</strong> 133700
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EXOSTOSES, MULTIPLE, TYPE I; EXT1
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<em>Alternative titles; symbols</em>
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EXT<br />
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MULTIPLE CARTILAGINOUS EXOSTOSES<br />
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DIAPHYSEAL ACLASIS<br />
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MULTIPLE OSTEOCHONDROMAS<br />
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OSTEOCHONDROMATOSIS
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<strong>SNOMEDCT:</strong> 254044004;
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<strong>ICD10CM:</strong> Q78.6;
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<strong>ORPHA:</strong> 321;
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<strong>DO:</strong> 206;
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<strong>Phenotype-Gene Relationships</strong>
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Location
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Phenotype
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Phenotype <br /> MIM number
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Inheritance
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Phenotype <br /> mapping key
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Gene/Locus <br /> MIM number
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8q24.11
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Exostoses, multiple, type 1
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133700
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Autosomal dominant
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3
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EXT1
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608177
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<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because multiple exostoses type I (EXT1) is caused by heterozygous mutation in the gene encoding exostosin-1 (EXT1; 608177) on chromosome 8q24.</p>
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<strong>Description</strong>
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<p>Multiple hereditary exostoses (EXT) is an autosomal dominant disorder characterized by multiple projections of bone capped by cartilage, most numerous in the metaphyses of long bones, but also occurring on the diaphyses of long bones. Flat bones, vertebrae, and the ribs may also be affected, but the skull is usually not involved. Deformity of the legs, forearms (resembling Madelung deformity), and hands is frequent (Peterson, 1989).</p><p>Two conditions in which multiple exostoses occur are metachondromatosis (156250) and the Langer-Giedion syndrome (LGS; 150230); the latter condition is also known as trichorhinophalangeal syndrome type II. Furthermore, exostosis-like lesions occur with fibrodysplasia ossificans progressiva (FOP; 135100), occipital horn syndrome (304150), and the adult stage of hereditary hypophosphatemia (see 307800); these exostoses are located at sites of tendon and muscle attachment. A relatively rare variant of the supracondylar process, on the anteromedial surface of the distal humerus, can be confused with an exostosis; the variant is said to be present in about 1% of persons of European descent (Silverman, 1985).</p><p><strong><em>Genetic Heterogeneity of Multiple Exostoses</em></strong></p><p>
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Multiple exostoses type II (EXT2; 133701) is caused by mutation in the EXT2 gene (608210) on chromosome 11p11. Multiple exostoses type III (EXT3; 600209) has been mapped to a locus on chromosome 19.</p>
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<strong>Clinical Features</strong>
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<p>Krooth et al. (1961) reported on a study of the families of 6 persons with diaphyseal aclasis (multiple exostoses). The families were Chamorros, a Micronesian people who live in the Mariana Islands. The frequency of diaphyseal aclasis in the Chamorros of Guam was estimated at 1 in 1,000. In the 21 Guam cases, the tumors were evident on inspection in all males but in only half the females. In a study of 56 patients, Solomon (1963) found a sex ratio of 1 and reported that two-thirds of the patients had an affected parent. </p><p>Solomon (1964) observed 1 family in which all 8 affected persons in 4 sibships of 3 generations showed exostoses on the bones of the hands and fingers with very few elsewhere. In no other patients of his study did the abnormality take this particular form. Other workers had found no correlation between members of the same family as to form and distribution of disease. Solomon (1964) suggested that the family he reported may suffer from a rare disorder due to a gene distinct from that causing most cases. </p><p>Wicklund et al. (1995) conducted a retrospective review of 43 affected probands and 137 of their affected relatives. Penetrance appeared to be 100%. There was an excess of males within the entire affected population (104:76) and within identified probands (28:15). However, the male-to-female ratio was unskewed in nuclear families (probands, affected sibs, and parents). The excess of males appeared to be related to the fact that males have more severe and more frequent complications of EXT which do not have a primary genetic origin. Only 2.8% of the total affected population had experienced exostosis-related malignancy. </p><p>Quirini et al. (1996) described depression of the thoracic spinal cord in a 24-year-old male with a calcified osteochondroma contiguous with the upper endplate of T8. Del-Rio et al. (1992) described a 14-year-old boy in whom multiple exostoses had an unusual feature: exostoses on the distal phalanges were associated with malalignment and longitudinal dystrophy of the fingernails. </p><p>Reviewing a large cohort of 175 multiple exostoses patients referred to them over a 40-year period (1955 to 1995), Legeai-Mallet et al. (1997) found that 109 (62%) cases were familial and 66 (38%) were isolated. The disorder was consistently diagnosed before the age of 12 years, and the risk of malignancy, although increased, was modest (0.57%). The observation of 7 unaffected individuals (6 females, 1 male) with a family history and affected offspring supported the incomplete penetrance of the disorder. Moreover, the observation of an unequal sex ratio with a preponderance of males among the probands in this series (103 to 72, P less than 0.02) and in all reported series to date (198 to 133, P less than 0.001) gave support to the incomplete penetrance of EXT genes according to sex. </p><p>In 2 large consanguineous Pakistani families with typical features of multiple hereditary exostoses and mutations in EXT1 (see 608177.0010 and 608177.0011), Faiyaz-Ul-Haque et al. (2004) noted a previously unreported feature, bilateral overriding of single toes. No unaffected individuals had this feature, which was present at birth and allowed earlier diagnosis of the disorder. </p><p>Fusco et al. (2019) described 42 patients with EXT1. The most commonly affected bones with osteochondroma/exostoses were the long bones of the upper and lower limbs. The second most commonly affected bones were in the chest. The mean number of osteochondromas per patient was approximately 10. Females had more lesions in ribs and distal ulna compared to males, whereas males had more lesions in the feet. </p><p><strong><em>Risk of Malignant Change</em></strong></p><p>
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Voutsinas and Wynne-Davies (1983) suggested that the risk of malignant change in multiple exostoses is 0.5% (or 1.3% of those over 21 years). Matsuno et al. (1988) described a 19-year-old woman and a 29-year-old man with spindle-cell sarcoma as a complication of multiple exostoses. Both of the patients came from families with many affected members. Matsuno et al. (1988) stated that 20 to 50% of patients with multiple exostoses develop malignant change, as compared with 1 to 4% of persons with a solitary osteochondroma. That estimate of the frequency of malignant change may be abnormally high; the patients who get into trouble are those who come to medical attention. </p><p>In a review, Hennekam (1991) noted that malignancies probably occur in about 0.5 to 2% of cases. He quoted Ochsner (1978) who collected data on 59 patients with osteosarcoma in multiple exostoses. The mean age of onset of malignant degeneration was 31 years; it seldom occurred before the tenth or after the fiftieth year. The upper end of the femur and the pelvis were the main locations of exostoses, but they were also found in the shoulder girdle and the ribs. </p>
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<strong>Clinical Management</strong>
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<p>Peterson (1989) discussed the orthopedic management of multiple hereditary exostoses.</p>
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<strong>Mapping</strong>
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<p>Buhler and Malik (1984) suggested that the mutation of multiple exostoses may be on 8q in the region of 8q24.1. They noted that the multiple exostoses of the Langer-Giedion syndrome are indistinguishable from those of the isolated disorder and that at least 1 case of trichorhinophalangeal syndrome without multiple exostoses had been found to have deletion in this region (Hamers et al., 1983). Buhler and Malik (1984) suggested that 2 closely linked loci may be situated at 8q24: 1 for type I trichorhinophalangeal syndrome (TRPS1; 190350) and 1 for multiple exostoses, and both may be deleted in LGS. Mental retardation present in some cases of LGS may be the result of deletion of additional neighboring genetic material. </p><p>Ogle et al. (1991) observed multiple exostoses in association with a balanced reciprocal translocation between 8q and 11p. The breakpoint on chromosome 8 was at proximal 8q24.1 within the critical region reported for Langer-Giedion syndrome. </p><p>Cook et al. (1993) found evidence for linkage of EXT to highly informative, short tandem repeat (STR) markers in the 8q24.11-q24.13 region, with genetic heterogeneity. A model of heterogeneity with linkage of the disease locus to the STR markers in 70% of the families (with a 95% confidence interval of 26 to 96%) produced a maximum lod score of 8.11, with the most likely position of the locus between D8S85 and D8S199. </p><p>Studying material from a patient with multiple exostoses and a translocation t(8;13) with a breakpoint at 8q23, Yoshiura et al. (1994) determined the order of 7 loci defined by cosmid clones by means of 2-color fluorescence in situ hybridization on elongated prophase chromosomes. They identified 2 flanking loci and by pulsed field gel electrophoresis with one of the flanking probes concluded that the probe lies less than 600 kb from the chromosomal breakpoint. Ludecke et al. (1995) and Hou et al. (1995) presented evidence that the Langer-Giedion syndrome is a true contiguous gene syndrome due to loss of functional copies of both the TRPS1 and the EXT1 gene and that the EXT1 gene is more than 1 Mb distal to the TRPS1 gene. </p><p>Blanton et al. (1996) studied 12 large multigenerational EXT families and found that the disorder mapped to 8q24 (EXT1) in 6 and to 11p (EXT2) in 6. None of the families mapped to the chromosome 19 locus (EXT3). </p><p>In 3 of 8 sporadic osteocartilaginous exostoses tumors, Mertens et al. (1994) found structural chromosomal rearrangements leading to loss of chromosome 8q24.1. The authors noted that multiple exostoses are part of the disease phenotype in patients with autosomal dominant LGS, many of whom have constitutional loss of genetic material from 8q24.1. Mertens et al. (1994) postulated the existence of a gene which carries a mutant allele that is inherited in the familial form of multiple exostoses and leads to the development of exostosis when a second mutation occurs as a somatic event in the other chromosome. </p><p>Pramparo et al. (2003) reported a family with multiple exostoses segregating with a reciprocal translocation, t(8;19)(q24.11;q13.13), in 8 members of 3 generations. FISH investigations detected a breakage of the dosage-sensitive EXT1 gene. Although 3 members of the family died perinatally from unknown causes and 1 carrier had 4 spontaneous abortions, the translocation was found only when a cytogenetic analysis was requested in an affected male because of oligozoospermia. Pramparo et al. (2003) noted that infertile males may be carriers of reciprocal or Robertsonian translocations with a higher frequency than the general population. </p><p><strong><em>Locus Heterogeneity</em></strong></p><p>
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Hall et al. (1985) could find no abnormality of 8q in cells cultured from an exostosis. </p><p>Using probe L48 at locus D8S51, Le Merrer et al. (1992) excluded the EXT gene from the 8q24.1 region. The cumulative lod score was -8.96 at theta = 0. In an addendum they stated that the testing of 3 additional families brought the lod score with probe L48 to -18.32 at theta = 0. In 2 Dutch EXT pedigrees with a total of 22 affected persons, Bakker et al. (1993) excluded linkage to the 8q22-q24 region, indicating genetic heterogeneity. </p><p>Legeai-Mallet et al. (1997) tested a series of 29 EXT families for possible linkage to the 3 known disease loci and estimated the probability of linkage of the disease to each locus by using an extension of the admixture test, which made modeling of heterogeneous monogenic disease feasible. A maximum likelihood was obtained for proportions of 44%, 28%, and 28% of families being linked to chromosomes 8, 11, and 19, respectively. No evidence of a fourth locus for the disease was found. </p><p>Francannet et al. (2001) reported a clinical and molecular study of 42 French families representing 217 affected individuals with multiple exostoses. Based on age of onset, number and location of exostoses, stature, and functional rating, they divided the affected individuals into those with a severe phenotype ('S') and those with a moderate phenotype ('M'). Seven of the 42 families belonged to group M, while the remaining 35 belonged to group S. Chondrosarcoma was found in 9 patients from 7 pedigrees, all of whom had type S. There was intrafamilial variability in severity of phenotype, and 4 families showed evidence of anticipation. The authors confirmed linkage to EXT1 in 29 of the families, to EXT2 in 9, and to EXT3 in 1. Francannet et al. (2001) concluded that there must be at least 1 additional locus for the multiple exostoses phenotype to account for the 3 unlinked families. </p>
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<strong>Molecular Genetics</strong>
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<p>In 2 of 23 unrelated families with multiple exostoses type I, Ahn et al. (1995) identified a 1-bp deletion in the EXT1 gene (608177.0001) that segregated with the disease. In 4 of 6 EXT families demonstrating linkage to the EXT1 locus on chromosome 8, Hecht et al. (1997) identified 3 germline mutations in the EXT1 gene that segregated with the disease phenotype in each family (608177.0002-608177.0004). In 7 of 17 families (41%) with EXT, Philippe et al. (1997) identified mutations in the EXT1 gene, including 5 novel mutations (see, e.g., 608177.0007 and 608177.0009). Five of the families (29%) had mutations in the EXT2 gene. </p><p>Wuyts et al. (1998) analyzed the EXT1 and EXT2 genes in 26 EXT families originating from 9 countries. Of the 26 families, 10 had an EXT1 mutation and 10 had an EXT2 mutation. Twelve of these mutations had not previously been described. From a review of these and previously reported mutations, Wuyts et al. (1998) concluded that mutations in either the EXT1 or the EXT2 gene are responsible for most cases of multiple exostoses. Most of the mutations in these 2 genes cause premature termination of the EXT proteins, whereas missense mutations are rare. The development of exostoses is, therefore, mainly due to loss of function of EXT genes, consistent with the hypothesis that the EXT genes have a tumor suppressor function. </p><p>In 23 of 43 Japanese families examined, Seki et al. (2001) found 21 mutations, of which 18 were novel. Seventeen (40%) of the 23 families had a mutation in EXT1 and 6 (14%) had a mutation in EXT2. Of the 17 families with EXT1 mutations, 13 had those causing premature termination of the EXT1 protein, and 4 showed missense mutations. In contrast to the findings of Seki et al. (2001), Xu et al. (1999) detected more mutations in EXT2 than in EXT1 in Chinese patients (33% and 14%, respectively). An excess of EXT1 mutations was found in Caucasian patients, however, by Philippe et al. (1997) and Wuyts et al. (1998). In both Caucasian patients, as studied by Raskind et al. (1998), and Japanese patients, more EXT1 mutations were identified in familial cases than in sporadic cases. </p><p>In a study of 82 Japanese patients with hereditary multiple exostoses by Seki et al. (2001), 4 patients developed malignancy and their mutations (3 in EXT1 and 1 in EXT2) were all different, suggesting that malignant transformation is not directly related to a particular mutation in EXT1 or EXT2, but more likely involves other genetic factors. Loss of heterozygosity has been detected in chondrosarcoma not only at the EXT loci but also at others such as 10q (RET; 164761) and 3q. </p><p>Wuyts and Van Hul (2000) stated that to date, 49 different EXT1 and 25 different EXT2 mutations had been identified in patients with multiple exostoses, and that mutations in these 2 genes were responsible for over 70% of the EXT cases. The variety of mutations in each gene was detailed. Most of the mutations caused loss of function, which is consistent with the presumed tumor suppressor function of the EXT genes. </p><p>In 79 unrelated Italian patients with multiple exostoses type I, Fusco et al. (2019) identified 62 different heterozygous mutations in the EXT1 gene, of which 36 were novel. The mutations were identified by direct sequencing or by MLPA analysis followed by confirmation with quantitative real-time PCR. The mutations included 23 frameshift, 22 nonsense, 6 missense, 9 splicing, and 2 intragenic rearrangements. The most common mutation was R340H (608177.0013), which occurred in 5 families. To evaluate the functional importance of EXT1 domains, Fusco et al. (2019) tested the effects of 2 truncating mutations (C355S and Leu427Argfs14), comprising the N-terminal domain or glycosyltransferase 64 C-terminal domain, in U2OS cells. The mutated proteins had abnormal localization in the cell. These mutant EXT1 proteins were also expressed in HEK293 cells, which showed slower growth compared to cells expressing wildtype EXT1. </p>
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</span>
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<h4>
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<span class="mim-font">
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<strong>Genotype/Phenotype Correlations</strong>
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</span>
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</h4>
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<span class="mim-text-font">
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<p>In 36 of 38 EXT families linked to EXT1 or EXT2, Francannet et al. (2001) identified mutations: 27 were located in EXT1 and were almost randomly distributed over the 9 exons; 90% caused premature termination of the EXT1 protein. Nineteen of the EXT1 mutations were novel. No mutations were found in 2 EXT1-linked families. A more severe phenotype ('S') was shown to be significantly associated with EXT1 mutations, while a more moderate phenotype ('M') was associated with EXT2 mutations. One subgroup of the S phenotype, IS (10 to 25 exostoses, no vertebral exostoses, height below the 10th centile), was associated with mutations in EXT1 or EXT2. Mutations associated with another subgroup, IVS (very short stature), were located in exon 1 of EXT1. Chondrosarcomas were found only in patients with EXT1 mutations. </p><p>In 7 patients with EXT1 mutations and 16 patients with EXT2 mutations, Alvarez et al. (2006) analyzed the anatomic burden of disease by clinical and radiographic examination and evaluation of 76 phenotypic parameters. Patients with EXT1 mutation were found to have more exostoses, more limb malalignment with shorter limb segments and height, and more pelvic and flatbone involvement. </p><p>In 11 of 23 German patients with multiple exostoses, Heinritz et al. (2009) identified 11 different novel mutations in the EXT1 gene (see, e.g., 608177.0012). Eleven patients had mutations in the EXT2 gene, and 1 patient had no detectable mutations. Multiple splice site defects were identified. Although clinical details were limited, those with EXT1 mutations tended to have a more severe phenotype. </p><p>Fusco et al. (2019) described genotype/phenotype correlations for 42 Italian patients with EXT1 and 27 Italian patients with EXT2. The patients included 38 females and 31 males, ranging in age from 4 to 74 years. There were no significant differences for age and sex between the EXT1 and EXT2 groups. The long bones of the upper and lower limbs were the most commonly affected bones with osteochondroma/exostoses. The second most commonly affected bones were the chest bones. Occasional vertebral osteochondroma/exostoses were identified in EXT1 patients, whereas none were identified in EXT2 patients. Impaired intellectual development was reported in 2 patients with EXT1, both of whom had a heterozygous nonsense variant in EXT1 (Q213X and C355X). The average number of total osteochondromas was approximately 10 in patients with EXT1 and approximately 7 in patients with EXT2. Osteochondroma/exostoses were more frequently reported in the distal humerus, distal ulna, ribs, proximal humerus, and distal radius in patients with EXT1 compared to patients with EXT2. Males with EXT1 had more total osteochondromas compared to males with EXT2, and more specifically had more osteochondromas in the distal humerus, distal ulna, ribs, and hands. The overall number of osteochondromas was comparable between females with EXT1 and EXT2. However, more osteochondromas were observed in the distal humerus and distal radius in females with EXT1 and in the proximal humerus in females with EXT2. </p>
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</span>
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<h4>
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<span class="mim-font">
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<strong>History</strong>
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</span>
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</h4>
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</div>
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<span class="mim-text-font">
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<p>Beighton et al. (1993) analyzed the skeletons of adults in the Museum of Pathological Anatomy in Vienna. The museum was established in 1796 by Emperor Franz I, and is now housed in the Narrenturm, which is situated on the grounds of the Altes Allgemeines Krankenhaus, formerly a facility for the custodial care of persons with insanity. The museum contains 44,000 specimens. Beighton et al. (1993) pictured the skeleton of a man with multiple exostoses who died in 1842 of ruptured aortic aneurysm (probably syphilitic). </p>
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</div>
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</div>
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<div>
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<h4>
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<span class="mim-font">
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<strong>See Also:</strong>
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</span>
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</h4>
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<span class="mim-text-font">
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Brooks and Wynne-Davies (1980); Buur and Morch (1983); Gardner et al.
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(1975); Ho and Lipton (1979); Morgan et al. (1962); Shapiro et al.
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(1979); Shupe et al. (1979); Sugiura et al. (1976); Vinstein and
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Franken (1971)
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</span>
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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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<h4>
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<span class="mim-font">
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<strong>REFERENCES</strong>
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</span>
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</h4>
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Del-Rio, R., Navarra, E., Ferrando, J., Mascaro, J. M.
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Ho, S. U., Lipton, H. L.
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Hou, J., Parrish, J., Ludecke, H.-J., Sapru, M., Wang, Y., Chen, W., Hill, A., Siegel-Bartelt, J., Northrup, H., Elder, F. F. B., Chinault, C., Horsthemke, B., Wagner, M. J., Wells, D. E.
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<strong>A 4-megabase YAC contig that spans the Langer-Giedion syndrome region on human chromosome 8q24.1: use in refining the location of the trichorhinophalangeal syndrome and multiple exostoses genes (TRPS1 and EXT1).</strong>
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Genomics 29: 87-97, 1995.
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[PubMed: 8530105]
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<p class="mim-text-font">
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Krooth, R. S., Macklin, M. T., Hilbish, T. F.
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<strong>Diaphysial aclasis (multiple exostoses) on Guam.</strong>
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Am. J. Hum. Genet. 13: 340-347, 1961.
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[PubMed: 13754517]
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<p class="mim-text-font">
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Le Merrer, M., Ben Othmane, K., Stanescu, V., Lyonnet, S., Van Maldergem, L., Royer, G., Munnich, A., Maroteaux, P.
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<strong>The gene for hereditary multiple exostoses does not map to the Langer-Giedion region (8q23-q24).</strong>
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J. Med. Genet. 29: 713-715, 1992.
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[PubMed: 1433231]
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</p>
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Contributors:
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Hilary J. Vernon - updated : 11/06/2020<br>Cassandra L. Kniffin - updated : 11/10/2009<br>Marla J. F. O'Neill - updated : 9/22/2006<br>Marla J. F. O'Neill - updated : 4/20/2005<br>Victor A. McKusick - updated : 1/20/2004<br>Cassandra L. Kniffin - reorganized : 10/30/2003<br>Victor A. McKusick - updated : 10/7/2002<br>Michael J. Wright - updated : 10/5/2001<br>Victor A. McKusick - updated : 9/4/2001<br>Victor A. McKusick - updated : 2/21/2001<br>Victor A. McKusick - updated : 4/18/2000<br>Victor A. McKusick - updated : 2/9/2000<br>Victor A. McKusick - updated : 9/24/1999<br>Victor A. McKusick - updated : 4/18/1998<br>Victor A. McKusick - updated : 3/26/1998<br>Rebekah S. Rasooly - updated : 3/7/1998<br>Victor A. McKusick - updated : 10/6/1997<br>Victor A. McKusick - updated : 9/3/1997<br>Victor A. McKusick - updated : 7/14/1997<br>Victor A. McKusick - updated : 5/16/1997<br>Victor A. McKusick - updated : 3/4/1997<br>Moyra Smith - updated : 1/27/1997
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Victor A. McKusick : 6/4/1986
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NOTE: OMIM is intended for use primarily by physicians and other professionals concerned with genetic disorders, by genetics researchers,
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OMIM<sup>®</sup> and Online Mendelian Inheritance in Man<sup>®</sup> are registered trademarks of the Johns Hopkins University.
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Copyright<sup>®</sup> 1966-2025 Johns Hopkins University.
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Thank you in advance for your generous support, <br />
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