4053 lines
276 KiB
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Entry
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- #614381 - LEUKODYSTROPHY, HYPOMYELINATING, 8, WITH OR WITHOUT OLIGODONTIA AND/OR HYPOGONADOTROPIC HYPOGONADISM; HLD8
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<p>
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<span class="h4">#614381</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/614381"><strong>Clinical Synopsis</strong></a>
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<a href="/phenotypicSeries/PS312080"> <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="#inheritance">Inheritance</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="#references"><strong>References</strong></a>
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<a href="#contributors"><strong>Contributors</strong></a>
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<a href="#creationDate"><strong>Creation Date</strong></a>
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<a href="#editHistory"><strong>Edit History</strong></a>
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<div style="display: table-cell;">External Links</div>
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<div style="display: table-cell;">Clinical Resources</div>
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<div><a href="https://clinicaltrials.gov/search?cond=LEUKODYSTROPHY, HYPOMYELINATING, 8, WITH OR WITHOUT OLIGODONTIA AND/OR HYPOGONADOTROPIC HYPOGONADISM" class="mim-tip-hint" title="A registry of federally and privately supported clinical trials conducted in the United States and around the world." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Clinical Trials', 'domain': 'clinicaltrials.gov'})">Clinical Trials</a></div>
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<div><a href="#mimEuroGentestFold" id="mimEuroGentestToggle" data-toggle="collapse" class="mim-tip-hint mimTriangleToggle" title="A list of European laboratories that offer genetic testing."><span id="mimEuroGentestToggleTriangle" class="small" style="margin-left: -0.8em;">►</span>EuroGentest</div>
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<div id="mimEuroGentestFold" class="collapse">
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<div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=11647&Typ=Pat" title="Endosteal sclerosis-cerebellar hypoplasia syndrome" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">Endosteal sclerosis-cerebe… </a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=11816&Typ=Pat" title="Hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">Hypomyelination-hypogonado… </a></div>
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<div><a href="#mimGeneReviewsFold" id="mimGeneReviewsToggle" data-toggle="collapse" class="mim-tip-hint mimTriangleToggle" title="Expert-authored, peer-reviewed descriptions of inherited disorders including the uses of genetic testing in diagnosis, management, and genetic counseling."><span id="mimGeneReviewsToggleTriangle" class="small" style="margin-left: -0.8em;">►</span>Gene Reviews</div>
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<div id="mimGeneReviewsFold" class="collapse">
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<div style="margin-left: 0.5em;"><a href="https://www.ncbi.nlm.nih.gov/books/NBK1334/" title="Isolated Gonadotropin-Releasing Hormone (GnRH) Deficiency" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Gene Reviews', 'domain': 'ncbi.nlm.nih.gov'})">Isolated Gonadotropin-Rele…</a></div><div style="margin-left: 0.5em;"><a href="https://www.ncbi.nlm.nih.gov/books/NBK99167/" title="POLR3-Related Leukodystrophy" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Gene Reviews', 'domain': 'ncbi.nlm.nih.gov'})">POLR3-Related Leukodystrop…</a></div>
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<div><a href="https://medlineplus.gov/genetics/condition/pol-iii-related-leukodystrophy" class="mim-tip-hint" title="Consumer-friendly information about the effects of genetic variation on human health." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MedlinePlus Genetics', 'domain': 'medlineplus.gov'})">MedlinePlus Genetics</a></div>
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<div><a href="https://www.ncbi.nlm.nih.gov/gtr/all/tests/?term=614381[mim]" class="mim-tip-hint" title="Genetic Testing Registry." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GTR', 'domain': 'ncbi.nlm.nih.gov'})">GTR</a></div>
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<div><a href="#mimOrphanetFold" id="mimOrphanetToggle" data-toggle="collapse" class="mim-tip-hint mimTriangleToggle" title="European reference portal for information on rare diseases and orphan drugs."><span id="mimOrphanetToggleTriangle" class="small" style="margin-left: -0.8em;">►</span>Orphanet</div>
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<div id="mimOrphanetFold" class="collapse">
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<div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=85186" title="Endosteal sclerosis-cerebellar hypoplasia syndrome" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">Endosteal sclerosis-cerebe…</a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=88637" title="Hypomyelination-hypogonadotropic hypogonadism-hypodontia syndrome" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">Hypomyelination-hypogonado…</a></div>
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<div style="display: table-cell;">Animal Models</div>
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<div><a href="https://www.alliancegenome.org/disease/DOID:0060797" 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/614381" 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://wormbase.org/resources/disease/DOID:0060797" 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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<span class="mim-tip-bottom" qtip_title="<strong>Looking for this gene or this phenotype in other resources?</strong>" qtip_text="Select a related resource from the dropdown menu and click for a targeted link to information directly relevant.">
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<a id="title" class="mim-anchor"></a>
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<a id="number" class="mim-anchor"></a>
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<a href="#" class="mim-tip-icd" qtip_title="<strong>ICD+</strong>" qtip_text="
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<strong>ORPHA:</strong> 85186, 88637<br />
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<strong>DO:</strong> 0060797<br />
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">ICD+</a>
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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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614381
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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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LEUKODYSTROPHY, HYPOMYELINATING, 8, WITH OR WITHOUT OLIGODONTIA AND/OR HYPOGONADOTROPIC HYPOGONADISM; HLD8
|
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</span>
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</h3>
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<div>
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<br />
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<a id="alternativeTitles" class="mim-anchor"></a>
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<em>Alternative titles; symbols</em>
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<div>
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<h4>
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<span class="mim-font">
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4H LEUKODYSTROPHY 2<br />
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CEREBELLAR HYPOPLASIA WITH ENDOSTEAL SCLEROSIS
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<a id="phenotypeMap" class="mim-anchor"></a>
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<h4>
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<span class="mim-font">
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<strong>Phenotype-Gene Relationships</strong>
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</h4>
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Location
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Phenotype
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</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/12/757?start=-3&limit=10&highlight=757">
|
|
12q23.3
|
|
</a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
Leukodystrophy, hypomyelinating, 8, with or without oligodontia and/or hypogonadotropic hypogonadism
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614381"> 614381 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
POLR3B
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614366"> 614366 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div>
|
|
|
|
|
|
<div class="btn-group ">
|
|
<a href="/clinicalSynopsis/614381" 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/PS312080" 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/614381" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
|
|
<li><a href="/graph/radial/614381" 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 recessive <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/258211005" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">258211005</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0441748&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0441748</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000007</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000007</a>]</span><br />
|
|
|
|
</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 <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/422065006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">422065006</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/237836003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">237836003</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/237837007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">237837007</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/E34.31" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">E34.31</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/R62.52" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R62.52</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/783.43" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">783.43</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0349588&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0349588</a>, <a href="https://bioportal.bioontology.org/search?q=C0013336&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0013336</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003510" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003510</a>, <a href="https://hpo.jax.org/app/browse/term/HP:0004322" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0004322</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0004322" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0004322</a>]</span><br />
|
|
|
|
</span>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
</div>
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<strong> HEAD & NECK </strong>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
|
|
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<em> Eyes </em>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Myopia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/57190000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">57190000</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/H52.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H52.1</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/367.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">367.1</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0027092&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0027092</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000545" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000545</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000545" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000545</a>]</span><br /> -
|
|
Nystagmus <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/563001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">563001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/H55.0" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H55.0</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/H55.00" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H55.00</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/379.50" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">379.50</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0028738&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0028738</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000639" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000639</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000639" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000639</a>]</span><br /> -
|
|
Abnormal smooth pursuit <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1836393&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1836393</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000617" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000617</a>]</span><br /> -
|
|
Vertical gaze limitation <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3277006&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3277006</a>]</span><br /> -
|
|
Optic atrophy (in 1 patient) <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/76976005" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">76976005</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/H47.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H47.2</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/H47.20" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H47.20</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/377.10" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">377.10</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/377.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">377.1</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0029124&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0029124</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000648" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000648</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000648" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000648</a>]</span><br />
|
|
|
|
</span>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div>
|
|
<div>
|
|
<span class="h5 mim-font">
|
|
<em> Teeth </em>
|
|
</span>
|
|
</div>
|
|
<div style="margin-left: 2em;">
|
|
<span class="mim-font">
|
|
|
|
- Hypodontia (variable) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4229668&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4229668</a>]</span> <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/64969001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">64969001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/K00.0" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">K00.0</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000668" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000668</a>]</span><br /> -
|
|
Oligodontia (variable) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4229667&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4229667</a>]</span> <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/787414001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">787414001</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/64969001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">64969001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/K00.0" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">K00.0</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000677" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000677</a>]</span><br /> -
|
|
Delayed eruption <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/5639000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">5639000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0239174&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0239174</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000684" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000684</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000684" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000684</a>]</span><br /> -
|
|
Malpositioned teeth <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1852504&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1852504</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000692" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000692</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000692" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000692</a>]</span><br /> -
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|
Natal teeth <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/58748004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">58748004</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/1162501001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">1162501001</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/21995002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">21995002</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/K00.6" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">K00.6</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0027443&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0027443</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000695" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000695</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000695" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000695</a>]</span><br />
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</span>
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</div>
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</div>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<strong> ABDOMEN </strong>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<div>
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<div>
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<span class="h5 mim-font">
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<em> Gastrointestinal </em>
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</span>
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</div>
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<div style="margin-left: 2em;">
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<span class="mim-font">
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- Dysphagia (1 patient) <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/288939007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">288939007</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/40739000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">40739000</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R13.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R13.1</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/R13.10" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R13.10</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/787.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">787.2</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/787.20" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">787.20</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0011168&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0011168</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002015" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002015</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002015" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002015</a>]</span><br />
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</span>
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</div>
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</div>
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</div>
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</div>
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<div>
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<div>
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<span class="h5 mim-font">
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<strong> SKELETAL </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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|
|
- Endosteal sclerosis (in some patients) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C5830063&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5830063</a>]</span><br />
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</span>
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</div>
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</div>
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</div>
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<div>
|
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<div>
|
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<span class="h5 mim-font">
|
|
<strong> NEUROLOGIC </strong>
|
|
</span>
|
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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> Central Nervous System </em>
|
|
</span>
|
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</div>
|
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<div style="margin-left: 2em;">
|
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<span class="mim-font">
|
|
|
|
- Mildly delayed or normal early development <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4229672&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4229672</a>]</span><br /> -
|
|
Cerebellar ataxia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/85102008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">85102008</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0007758&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0007758</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001251" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001251</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001251" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001251</a>]</span><br /> -
|
|
Unsteady, wide-based gait <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4229671&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4229671</a>]</span><br /> -
|
|
Tremor <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/26079004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">26079004</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R25.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R25.1</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0040822&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0040822</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001337" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001337</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001337" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001337</a>]</span><br /> -
|
|
Dysarthria <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/8011004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">8011004</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/438.13" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">438.13</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/784.51" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">784.51</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0013362&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0013362</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001260" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001260</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001260" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001260</a>]</span><br /> -
|
|
Dysdiadochokinesis <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/23133003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">23133003</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0234979&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0234979</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002075" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002075</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002075" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002075</a>]</span><br /> -
|
|
Dysmetria <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/32566006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">32566006</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0234162&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0234162</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001310" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001310</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001310" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001310</a>]</span><br /> -
|
|
Mental retardation, mild to moderate <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1861865&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1861865</a>]</span> <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/228156007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">228156007</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/110359009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">110359009</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/317-319.99" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">317-319.99</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001249" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001249</a>]</span><br /> -
|
|
Intellectual disability, mild <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/86765009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">86765009</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/F70" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F70</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/317" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">317</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0026106&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0026106</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001256" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001256</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001256" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001256</a>]</span><br /> -
|
|
Spasticity (variable) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4229670&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4229670</a>]</span> <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/221360009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">221360009</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/397790002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">397790002</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001257" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001257</a>]</span><br /> -
|
|
Leukodystrophy <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/192781003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">192781003</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/330.0" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">330.0</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0023520&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0023520</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002415" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002415</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002415" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002415</a>]</span><br /> -
|
|
Diffuse hypomyelination seen on brain MRI <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C5830062&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5830062</a>]</span><br /> -
|
|
Cerebellar atrophy seen on MRI <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3807888&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3807888</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001272" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001272</a>]</span><br /> -
|
|
Thin corpus callosum seen on MRI <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4314974&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4314974</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0033725" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0033725</a>]</span><br />
|
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|
|
</span>
|
|
</div>
|
|
</div>
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</div>
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</div>
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<div>
|
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<div>
|
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<span class="h5 mim-font">
|
|
<strong> ENDOCRINE FEATURES </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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- Hypogonadotropic hypogonadism (variable) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4229673&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4229673</a>]</span> <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/22053006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">22053006</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/33927004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">33927004</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/405769009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">405769009</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/E23.0" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">E23.0</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/Q98.0" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">Q98.0</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/Q98.4" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">Q98.4</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/758.7" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">758.7</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000044" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000044</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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- Onset in early childhood (2 to 4 years)<br /> -
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Variable phenotype <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1837514&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1837514</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003812" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003812</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003812" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003812</a>]</span><br /> -
|
|
Slowly progressive or nonprogressive<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> MOLECULAR BASIS </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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- Caused by mutation in the RNA polymerase III, subunit B gene (POLR3B, <a href="/entry/614366#0001">614366.0001</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">
|
|
<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>
|
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Leukodystrophy, hypomyelinating
|
|
- <a href="/phenotypicSeries/PS312080">PS312080</a>
|
|
- 28 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>
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</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Inheritance</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Phenotype<br />mapping key</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Phenotype<br />MIM number</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Gene/Locus</strong>
|
|
</th>
|
|
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
|
|
<strong>Gene/Locus<br />MIM number</strong>
|
|
</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/539?start=-3&limit=10&highlight=539"> 1p34.1 </a>
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|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/619688"> Leukodystrophy, hypomyelinating, 23, with ataxia, deafness, liver dysfunction, and dilated cardiomyopathy </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/619688"> 619688 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616136"> RNF220 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616136"> 616136 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/1715?start=-3&limit=10&highlight=1715"> 1q41 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617951"> Leukodystrophy, hypomyelinating, 15 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617951"> 617951 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/138295"> EPRS </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/138295"> 138295 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/1743?start=-3&limit=10&highlight=1743"> 1q42.11 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618404"> Leukodystrophy, hypomyelinating, 18 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618404"> 618404 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/615843"> DEGS1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/615843"> 615843 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/1752?start=-3&limit=10&highlight=1752"> 1q42.12 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618688"> Leukodystrophy, hypomyelinating, 19, transient infantile </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/618688"> 618688 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618685"> TMEM63A </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618685"> 618685 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/1754?start=-3&limit=10&highlight=1754"> 1q42.12 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616420"> Leukodystrophy, hypomyelinating, 10 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616420"> 616420 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616406"> PYCR2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616406"> 616406 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/1/1773?start=-3&limit=10&highlight=1773"> 1q42.13 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608804"> Leukodystrophy, hypomyelinating, 2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608804"> 608804 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608803"> GJC2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608803"> 608803 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/2/436?start=-3&limit=10&highlight=436"> 2p11.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620675"> Leukodystrophy, hypomyelinating, 27 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620675"> 620675 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616404"> POLR1A </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616404"> 616404 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/2/464?start=-3&limit=10&highlight=464"> 2q11.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620978"> ?Leukodystrophy, hypomyelinating, 28 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620978"> 620978 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/188860"> MAL </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/188860"> 188860 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/2/654?start=-3&limit=10&highlight=654"> 2q21.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620243"> Leukodystrophy, hypomyelinating, 25 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620243"> 620243 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618978"> TMEM163 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618978"> 618978 </a>
|
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</span>
|
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</td>
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</tr>
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|
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|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/2/891?start=-3&limit=10&highlight=891"> 2q33.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/612233"> Leukodystrophy, hypomyelinating, 4 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/612233"> 612233 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/118190"> HSPD1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/118190"> 118190 </a>
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</span>
|
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</td>
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|
</tr>
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|
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|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/3/859?start=-3&limit=10&highlight=859"> 3q26.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/619328"> Leukodystrophy, hypomyelinating, 22 </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/619328"> 619328 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601326"> CLDN11 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/601326"> 601326 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/4/465?start=-3&limit=10&highlight=465"> 4q24 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/260600"> Leukodystrophy, hypomyelinating, 3 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/260600"> 260600 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/603605"> AIMP1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/603605"> 603605 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/5/743?start=-3&limit=10&highlight=743"> 5q34 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616140"> Leukodystrophy, hypomyelinating, 9 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616140"> 616140 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/107820"> RARS1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/107820"> 107820 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/6/528?start=-3&limit=10&highlight=528"> 6p21.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616494"> Leukodystrophy, hypomyelinating, 11 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616494"> 616494 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610060"> POLR1C </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610060"> 610060 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/6/542?start=-3&limit=10&highlight=542"> 6p21.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620269"> Leukodystrophy, hypomyelinating, 26, with chondrodysplasia </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/620269"> 620269 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610788"> SLC35B2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610788"> 610788 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/7/52?start=-3&limit=10&highlight=52"> 7p22.1 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618006"> Leukodystrophy, hypomyelinating, 17 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/618006"> 618006 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600859"> AIMP2 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/600859"> 600859 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/7/74?start=-3&limit=10&highlight=74"> 7p21.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/617964"> Leukodystrophy, hypomyelinating, 16 </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/617964"> 617964 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613413"> TMEM106B </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/613413"> 613413 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/7/110?start=-3&limit=10&highlight=110"> 7p15.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610532"> Leukodystrophy, hypomyelinating, 5 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610532"> 610532 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610531"> HYCC1 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/610531"> 610531 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/10/327?start=-3&limit=10&highlight=327"> 10q22.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607694"> Leukodystrophy, hypomyelinating, 7, with or without oligodontia and/or hypogonadotropic hypogonadism </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/607694"> 607694 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614258"> POLR3A </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614258"> 614258 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/11/808?start=-3&limit=10&highlight=808"> 11q14.2 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616881"> Leukodystrophy, hypomyelinating, 13 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616881"> 616881 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614908"> HIKESHI </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614908"> 614908 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/11/1003?start=-3&limit=10&highlight=1003"> 11q23.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616683"> Leukodystrophy, hypomyelinating, 12 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/616683"> 616683 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608549"> VPS11 </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/608549"> 608549 </a>
|
|
</span>
|
|
</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td>
|
|
<span class="mim-font">
|
|
|
|
<a href="/geneMap/12/757?start=-3&limit=10&highlight=757"> 12q23.3 </a>
|
|
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
<a href="/entry/614381"> Leukodystrophy, hypomyelinating, 8, with or without oligodontia and/or hypogonadotropic hypogonadism </a>
|
|
</span>
|
|
</td>
|
|
<td>
|
|
<span class="mim-font">
|
|
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<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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<a href="/entry/614366"> POLR3B </a>
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<a href="/entry/617899"> Leukodystrophy, hypomyelinating, 14 </a>
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<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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<a href="/entry/619851"> ?Leukodystrophy, hypomyelinating, 24 </a>
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<a href="/entry/619310"> Leukodystrophy, hypomyelinating, 21 </a>
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<a href="/entry/619310"> 619310 </a>
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<a href="/entry/606007"> POLR3K </a>
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<a href="/entry/606007"> 606007 </a>
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<a href="/entry/619071"> ?Leukodystrophy, hypomyelinating, 20 </a>
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<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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<a href="/entry/619071"> 619071 </a>
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<a href="/entry/123830"> 123830 </a>
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<a href="/entry/612438"> Leukodystrophy, hypomyelinating, 6 </a>
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<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
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<a href="/entry/612438"> 612438 </a>
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<a href="/entry/602662"> TUBB4A </a>
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<a href="/entry/602662"> 602662 </a>
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<a href="/geneMap/X/532?start=-3&limit=10&highlight=532"> Xq22.2 </a>
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<a href="/entry/312080"> Pelizaeus-Merzbacher disease </a>
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<abbr class="mim-tip-hint" title="X-linked recessive">XLR</abbr>
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<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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<a href="/entry/312080"> 312080 </a>
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<a href="/entry/300401"> PLP1 </a>
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<a href="/entry/300401"> 300401 </a>
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<a href="#mimPhenotypicSeriesFold" data-toggle="collapse">▲ Close</a>
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<span class="mim-tip-floating" qtip_title="<strong>Looking For More References?</strong>" qtip_text="Click the 'reference plus' icon <span class='glyphicon glyphicon-plus-sign'></span> at the end of each OMIM text paragraph to see more references related to the content of the preceding paragraph.">
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<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because of evidence that hypomyelinating leukodystrophy-8 (HLD8) is caused by compound heterozygous mutation in the POLR3B gene (<a href="/entry/614366">614366</a>) on chromosome 12q23.</p>
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<strong>Description</strong>
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<p>Hypomyelinating leukodystrophy-8 (HLD8) is an autosomal recessive neurologic disorder characterized by early childhood onset of cerebellar ataxia and mild intellectual disabilities associated with diffuse hypomyelination apparent on brain MRI. Variable features include oligodontia and/or hypogonadotropic hypogonadism (summary by <a href="#9" class="mim-tip-reference" title="Tetreault, M., Choquet, K., Orcesi, S., Tonduti, D., Balottin, U., Teichmann, M., Fribourg, S., Schiffmann, R., Brais, B., Vanderver, A., Bernard, G. <strong>Recessive mutations in POLR3B, encoding the second largest subunit of pol III, cause a rare hypomyelinating leukodystrophy.</strong> Am. J. Hum. Genet. 89: 652-655, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22036172/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22036172</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=22036172[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1016/j.ajhg.2011.10.006" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="22036172">Tetreault et al., 2011</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=22036172" 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>See also HLD7 (<a href="/entry/607694">607694</a>), which has similar features and is caused by mutation in the POLR3A gene (<a href="/entry/614258">614258</a>) on chromosome 10q22. The POLR3A and POLR3B genes encode the 2 largest subunits of RNA polymerase III.</p><p>For a general phenotypic description and a discussion of genetic heterogeneity of hypomyelinating leukodystrophy, see <a href="/entry/312080">312080</a>.</p>
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<strong>Clinical Features</strong>
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<p>Cerebellar hypoplasia with endosteal sclerosis appears to have been described first by <a href="#8" class="mim-tip-reference" title="Stoll, C., Talon, P., Alembik, Y., Levy, J. M. <strong>Hypoplasie cerebelleuse congenitale avec lesions osseuses.</strong> Ann. Pediat. (Paris) 33: 417-421, 1986.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/3729252/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">3729252</a>]" pmid="3729252">Stoll et al. (1986)</a>. The parents in this case were consanguineous. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=3729252" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#1" class="mim-tip-reference" title="Charrow, J., Poznanski, A. K., Unger, F. M., Robinow, M. <strong>Autosomal recessive cerebellar hypoplasia and endosteal sclerosis: a newly recognized syndrome.</strong> Am. J. Med. Genet. 41: 464-468, 1991.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/1776639/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">1776639</a>] [<a href="https://doi.org/10.1002/ajmg.1320410417" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="1776639">Charrow et al. (1991)</a> described a brother and sister and an unrelated boy with congenital cerebellar hypoplasia and endosteal sclerosis. All 3 children presented with ataxia and developmental delay and were found to have microcephaly, short stature, oligodontia, strabismus, nystagmus, and congenital hip dislocation. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=1776639" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#4" class="mim-tip-reference" title="Ozgen, H. M., Overweg-Plandsoen, W. C. G., Blees-Pelk, J., Besselaar, P. P., Hennekam, R. C. M. <strong>Cerebellar hypoplasia--endosteal sclerosis: a long term follow-up.</strong> Am. J. Med. Genet. 134A: 215-219, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15672385/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15672385</a>] [<a href="https://doi.org/10.1002/ajmg.a.30589" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15672385">Ozgen et al. (2005)</a> described 11-year follow-up of an affected girl whose major clinical symptoms were cerebellar hypoplasia causing ataxia, hypotonia, mild to moderate developmental delay, growth retardation, endosteal sclerosis, tooth eruption disturbances, and hip dislocations. The endosteal sclerosis remained stationary over time, as did the clinical neurologic symptoms, but neuroradiologic manifestations slowly progressed. <a href="#4" class="mim-tip-reference" title="Ozgen, H. M., Overweg-Plandsoen, W. C. G., Blees-Pelk, J., Besselaar, P. P., Hennekam, R. C. M. <strong>Cerebellar hypoplasia--endosteal sclerosis: a long term follow-up.</strong> Am. J. Med. Genet. 134A: 215-219, 2005.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15672385/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15672385</a>] [<a href="https://doi.org/10.1002/ajmg.a.30589" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="15672385">Ozgen et al. (2005)</a> concluded that the disorder is probably autosomal recessive. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15672385" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#6" class="mim-tip-reference" title="Saitsu, H., Osaka, H., Sasaki, M., Takanashi, J., Hamada, K., Yamashita, A., Shibayama, H., Shiina, M., Kondo, Y., Nishiyama, K., Tsurusaki, Y., Miyake, N., Doi, H., Ogata, K., Inoue, K., Matsumoto, N. <strong>Mutations in POLR3A and POLR3B encoding RNA polymerase III subunits cause an autosomal-recessive hypomyelinating leukoencephalopathy.</strong> Am. J. Hum. Genet. 89: 644-651, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22036171/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22036171</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=22036171[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1016/j.ajhg.2011.10.003" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="22036171">Saitsu et al. (2011)</a> reported 3 patients from 2 unrelated nonconsanguineous Japanese families with childhood-onset hypomyelinating leukodystrophy. Two sibs had a very similar phenotype, with normal early infantile development and walking at ages 14 and 15 months, respectively. At age 3 years, 1 showed unstable walking and frequent falls and the other became poor at exercise. They had mildly impaired intellectual development but were able to finish high school. As adults, both had cerebellar signs, including ataxic speech, wide-based ataxic gait, dysdiadochokinesis, and dysmetria, hypotonia, and mild hyperreflexia without extensor plantar responses. However, the motor deterioration was not considered to be progressive. Both also showed signs of hypogonadotropic hypogonadism. Other features included myopia, mild horizontal nystagmus, slowing of smooth-pursuit eye movements, and vertical gaze limitation. Brain MRI showed high-intensity areas in the white matter on T2-weighted images, consistent with diffuse cerebral hypomyelination, as well as cerebellar atrophy, and hypoplastic corpus callosum. A third unrelated patient, previously reported as patient 1 by <a href="#7" class="mim-tip-reference" title="Sasaki, M., Takanashi, J., Tada, H., Sakuma, H., Furushima, W., Sato, N. <strong>Diffuse cerebral hypomyelination with cerebellar atrophy and hypoplasia of the corpus callosum.</strong> Brain Dev. 31: 582-587, 2009.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18851904/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18851904</a>] [<a href="https://doi.org/10.1016/j.braindev.2008.09.003" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18851904">Sasaki et al. (2009)</a>, could still walk in her teens, showed cerebellar signs, mild spasticity, slowing of smooth-pursuit eye movements, vertical gaze limitations, and intellectual disability. She did not have hypogonadism. None of the 3 had hypodontia. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=18851904+22036171" 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="Tetreault, M., Choquet, K., Orcesi, S., Tonduti, D., Balottin, U., Teichmann, M., Fribourg, S., Schiffmann, R., Brais, B., Vanderver, A., Bernard, G. <strong>Recessive mutations in POLR3B, encoding the second largest subunit of pol III, cause a rare hypomyelinating leukodystrophy.</strong> Am. J. Hum. Genet. 89: 652-655, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22036172/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22036172</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=22036172[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1016/j.ajhg.2011.10.006" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="22036172">Tetreault et al. (2011)</a> studied 3 unrelated patients of European descent who had a phenotype consistent with 4H syndrome (HLD7; <a href="/entry/607694">607694</a>) but who did not have mutations in the POLR3A gene (<a href="/entry/614258">614258</a>). All presented in early childhood with mild developmental delays and developed dysarthria as well as progressive motor difficulties, including cerebellar ataxia. Two showed progressive spasticity. Two individuals developed hypogonadotropic hypogonadism, whereas the third was too young to evaluate for endocrine dysfunction. All 3 individuals had teeth abnormalities, such as neonatal upper incisors, delayed eruption of deciduous teeth and permanent teeth, abnormal sequence of eruption, and malposition. Brain MRI showed thin corpus callosum, cerebellar atrophy, and hypomyelination. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=22036172" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#2" class="mim-tip-reference" title="Daoud, H., Tetreault, M., Gibson, W., Guerrero, K., Cohen, A., Gburek-Augustat, J., Synofzik, M., Brais, B., Stevens, C. A., Sanchez-Carpintero, R., Goizet, C., Naidu, S., Vanderver, A., Bernard, G. <strong>Mutations in POLR3A and POLR3B are a major cause of hypomyelinating leukodystrophies with or without dental abnormalities and/or hypogonadotropic hypogonadism.</strong> J. Med. Genet. 50: 194-197, 2013.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/23355746/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">23355746</a>] [<a href="https://doi.org/10.1136/jmedgenet-2012-101357" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="23355746">Daoud et al. (2013)</a> reported 7 patients with HLN8. Onset of disease ranged from less than 1 year to 15 years of age. Six of the patients had dental anomalies. Four of the patients had hypogonadotrophic hypogonadism. Upper motor neuron signs were found in 5 of 6 patients for whom this information was available. All of the patients had cerebellar signs. Impaired intellectual development was reported in 4 of 5 patients for whom this information was available. One patient required a wheelchair for mobility. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=23355746" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#3" class="mim-tip-reference" title="Ghoumid, J., Petit, F., Boute-Benejean, O., Frenois, F., Cartigny, M., Vanlerberghe, C., Smol, T., Caumes, R., de Roux, N., Manouvrier-Hanu, S. <strong>Cerebellar hypoplasia with endosteal sclerosis is a POLR3-related disorder.</strong> Europ. J. Hum. Genet. 25: 1011-1014, 2017.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/28589944/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">28589944</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=28589944[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1038/ejhg.2017.73" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="28589944">Ghoumid et al. (2017)</a> reported a patient with severe cognitive impairment who developed worsening tremor and dysmetria in the first year of life. He had 5 teeth at birth, and when his primary teeth erupted, he was missing 4 superior molars and 2 inferior molars. Radiographs at age 2 years showed vertebral, pelvic, and femoral endosteal sclerosis. At age 15 years, he had growth delay, hypotonia, pyramidal signs, dystonia, optic atrophy, and hypogonadotropic hypogonadism. Brain MRI showed diffuse hypomyelination and severe cerebellar atrophy. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=28589944" 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="#10" class="mim-tip-reference" title="Verberne, E. A., Dalen Meurs, L., Wolf, N. I., 4H leukodystrophy caused by a homozygous POLR3B mutation. <strong>further delineation of the phenotype.</strong> Am. J. Med. Genet. 182A: 1776-1779, 2020.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/32319736/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">32319736</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=32319736[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1002/ajmg.a.61600" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="32319736">Verberne et al. (2020)</a> reported a 21-year-old woman who presented at 14 years of age for evaluation of a history of developmental delay and hypoplasia of the cerebellar vermis. She had cerebellar ataxia, impaired intellectual development, dysarthria, intention tremor, hypodontia, myopia, and gaze-evoked nystagmus. Brain MRI at age 17 years demonstrated diffuse hyperintensity of white matter, supratentorial atrophy, and severe cerebellar atrophy. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=32319736" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>The transmission pattern of HLD8 in the families reported by <a href="#6" class="mim-tip-reference" title="Saitsu, H., Osaka, H., Sasaki, M., Takanashi, J., Hamada, K., Yamashita, A., Shibayama, H., Shiina, M., Kondo, Y., Nishiyama, K., Tsurusaki, Y., Miyake, N., Doi, H., Ogata, K., Inoue, K., Matsumoto, N. <strong>Mutations in POLR3A and POLR3B encoding RNA polymerase III subunits cause an autosomal-recessive hypomyelinating leukoencephalopathy.</strong> Am. J. Hum. Genet. 89: 644-651, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22036171/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22036171</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=22036171[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1016/j.ajhg.2011.10.003" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="22036171">Saitsu et al. (2011)</a> was consistent with autosomal recessive inheritance. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=22036171" 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>Using whole-exome sequencing, <a href="#6" class="mim-tip-reference" title="Saitsu, H., Osaka, H., Sasaki, M., Takanashi, J., Hamada, K., Yamashita, A., Shibayama, H., Shiina, M., Kondo, Y., Nishiyama, K., Tsurusaki, Y., Miyake, N., Doi, H., Ogata, K., Inoue, K., Matsumoto, N. <strong>Mutations in POLR3A and POLR3B encoding RNA polymerase III subunits cause an autosomal-recessive hypomyelinating leukoencephalopathy.</strong> Am. J. Hum. Genet. 89: 644-651, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22036171/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22036171</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=22036171[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1016/j.ajhg.2011.10.003" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="22036171">Saitsu et al. (2011)</a> identified compound heterozygous mutations in the POLR3B gene (<a href="/entry/614366#0001">614366.0001</a>-<a href="/entry/614366#0004">614366.0004</a>) in 3 patients from 2 unrelated Japanese families with hypomyelinating leukodystrophy-8. Two of the patients had hypogonadotropic hypogonadism, but none had hypodontia. One of the patients had previously been reported as patient 1 by <a href="#7" class="mim-tip-reference" title="Sasaki, M., Takanashi, J., Tada, H., Sakuma, H., Furushima, W., Sato, N. <strong>Diffuse cerebral hypomyelination with cerebellar atrophy and hypoplasia of the corpus callosum.</strong> Brain Dev. 31: 582-587, 2009.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/18851904/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">18851904</a>] [<a href="https://doi.org/10.1016/j.braindev.2008.09.003" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="18851904">Sasaki et al. (2009)</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=18851904+22036171" 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 unrelated patients of European descent with HLD8, <a href="#9" class="mim-tip-reference" title="Tetreault, M., Choquet, K., Orcesi, S., Tonduti, D., Balottin, U., Teichmann, M., Fribourg, S., Schiffmann, R., Brais, B., Vanderver, A., Bernard, G. <strong>Recessive mutations in POLR3B, encoding the second largest subunit of pol III, cause a rare hypomyelinating leukodystrophy.</strong> Am. J. Hum. Genet. 89: 652-655, 2011.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22036172/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22036172</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=22036172[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1016/j.ajhg.2011.10.006" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="22036172">Tetreault et al. (2011)</a> identified compound heterozygous mutations in the POLR3B gene (<a href="/entry/614366#0005">614366.0005</a>-<a href="/entry/614366#0008">614366.0008</a>). All had hypodontia and 2 developed hypogonadotropic hypogonadism. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=22036172" 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 cohort of 565 patients with isolated hypogonadotropic hypogonadism, with or without anosmia, <a href="#5" class="mim-tip-reference" title="Richards, M. R., Plummer, L., Chan, Y.-M., Lippincott, M. F., Quinton, R., Kumanov, P., Seminara, S. B. <strong>Phenotypic spectrum of POLR3B mutations: isolated hypogonadotropic hypogonadism without neurological or dental anomalies.</strong> J. Med. Genet. 54: 19-25, 2017.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/27512013/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">27512013</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=27512013[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1136/jmedgenet-2016-104064" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="27512013">Richards et al. (2017)</a> performed whole-exome sequencing and identified 4 patients from 3 unrelated families who were compound heterozygous for rare variants in the POLR3B gene and did not have variants in 7 other ataxia-associated genes. An M415T polymorphism (<a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs199504211;toggle_HGVS_names=open" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'dbSNP\', \'domain\': \'ensembl.org\'})">rs199504211</a>) of unclear pathologic significance was carried by 2 of the patients in addition to another variant in POLR3B; no segregation information was reported in those families. In 2 affected sibs, the V523E variant (<a href="/entry/614366#0005">614366.0005</a>; <a href="https://www.ensembl.org/Homo_sapiens/Variation/Summary?v=rs138249161;toggle_HGVS_names=open" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'dbSNP\', \'domain\': \'ensembl.org\'})">rs138249161</a>) and an F400S missense variant in POLR3B were identified, each inherited from an unaffected heterozygous parent. None of the 4 patients were reported to have frank neurologic symptoms at their most recent evaluations in their early 30s, and 1 had a brain MRI at age 23 years that was reported as normal. The authors suggested that a possible reason for the lack of neurodegenerative symptoms might be that the variants identified are less harmful to protein function than those identified in patients with HLD8, and noted that computational programs yielded mixed predictions regarding pathogenicity of the variants. No in vivo or in vitro functional analysis of the variants was reported. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=27512013" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#2" class="mim-tip-reference" title="Daoud, H., Tetreault, M., Gibson, W., Guerrero, K., Cohen, A., Gburek-Augustat, J., Synofzik, M., Brais, B., Stevens, C. A., Sanchez-Carpintero, R., Goizet, C., Naidu, S., Vanderver, A., Bernard, G. <strong>Mutations in POLR3A and POLR3B are a major cause of hypomyelinating leukodystrophies with or without dental abnormalities and/or hypogonadotropic hypogonadism.</strong> J. Med. Genet. 50: 194-197, 2013.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/23355746/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">23355746</a>] [<a href="https://doi.org/10.1136/jmedgenet-2012-101357" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="23355746">Daoud et al. (2013)</a> identified compound heterozygous mutations in the POLR3B gene in 7 patients with HLD8. Of the 8 mutations identified, 7 were novel (see, e.g., <a href="/entry/614366#0016">614366.0016</a>-<a href="/entry/614366#0018">614366.0018</a>). Six patients carried the previously identified V523E mutation (<a href="/entry/614366#0005">614366.0005</a>), which was located on a shared common haplotype in all 6. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=23355746" 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 15-year-old boy with HLD8, <a href="#3" class="mim-tip-reference" title="Ghoumid, J., Petit, F., Boute-Benejean, O., Frenois, F., Cartigny, M., Vanlerberghe, C., Smol, T., Caumes, R., de Roux, N., Manouvrier-Hanu, S. <strong>Cerebellar hypoplasia with endosteal sclerosis is a POLR3-related disorder.</strong> Europ. J. Hum. Genet. 25: 1011-1014, 2017.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/28589944/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">28589944</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=28589944[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1038/ejhg.2017.73" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="28589944">Ghoumid et al. (2017)</a> identified compound heterozygous mutations in the POLR3B gene: the recurrent V523E mutation and a missense mutation (P925Q; <a href="/entry/614366#0015">614366.0015</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=28589944" 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 21-year-old woman with HLD8, <a href="#10" class="mim-tip-reference" title="Verberne, E. A., Dalen Meurs, L., Wolf, N. I., 4H leukodystrophy caused by a homozygous POLR3B mutation. <strong>further delineation of the phenotype.</strong> Am. J. Med. Genet. 182A: 1776-1779, 2020.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/32319736/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">32319736</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=32319736[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1002/ajmg.a.61600" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="32319736">Verberne et al. (2020)</a> identified homozygosity for the recurrent V523E mutation in the POLR3B gene. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=32319736" 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="#11" class="mim-tip-reference" title="Wolf, N. I., Vanderver, A., van Spaendonk, R. M. L., Schiffmann, R., Brais, B., Bugiani, M., Sistermans, E., Catsman-Berrevoets, C., Kros, J. M., Soares Pinto, P., Pohl, D., Tirupathi, S., and 10 others. <strong>Clinical spectrum of 4H leukodystrophy caused by POLR3A and POLR3B mutations.</strong> Neurology 83: 1898-1905, 2014.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/25339210/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">25339210</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=25339210[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1212/WNL.0000000000001002" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="25339210">Wolf et al. (2014)</a> performed a cross-sectional observational study of 105 patients with 4H syndrome, including 43 with mutations in the POLR3A gene and 62 with mutations in the POLR3B gene. Except for the French Canadian patients, who carried a common POLR3A mutation (G672E; <a href="/entry/614258#0001">614258.0001</a>), most patients of European descent carried POLR3B mutations. Among all patients, about half had delayed development, including 19 (17%) who were never able to walk independently (4 with POLR3A mutations and 15 and POLR3B mutations). Ten (10%) of patients presented after age 10 years. All patients except one, who was older at the time of diagnosis, had cerebellar signs, such as severe intention tremor, dysmetria, ataxia, abnormal smooth pursuit, and nystagmus. Deterioration of speech and swallowing occurred later. Only a few patients had extrapyramidal signs, mainly dystonia. Cognition varied widely from normal in a few patients to moderate intellectual disability in most. About 20% of patients had seizures. Neurologic deterioration with infection occurred in about half of patients. Dental abnormalities, such as delayed dentition and hypodontia, were common (in 87%). Delayed puberty, in those old enough to assess, occurred in 81% of patients with POLR3A mutations and in 69% of those with POLR3B mutations. Most (87%) patients had severe and often progressive myopia, and about half had short stature. Growth hormone deficiency was found in 5 of 10 patients tested. Brain imaging showed hypomyelination in all patients and cerebellar atrophy in most. Supratentorial atrophy and thin corpus callosum were seen in older patients, reflecting white matter loss. A T2-weighted hypodense dot in the posterior limb of the internal capsule was seen in 70% of patients with POLR3B mutations, but only 13% of those with POLR3A mutations. In general, patients with POLR3A mutations had a more severe disease than those with POLR3B mutations. Two sibs with a homozygous POLR3B V523E mutation (<a href="/entry/614366#0005">614366.0005</a>) had an exceptionally mild clinical course. <a href="#11" class="mim-tip-reference" title="Wolf, N. I., Vanderver, A., van Spaendonk, R. M. L., Schiffmann, R., Brais, B., Bugiani, M., Sistermans, E., Catsman-Berrevoets, C., Kros, J. M., Soares Pinto, P., Pohl, D., Tirupathi, S., and 10 others. <strong>Clinical spectrum of 4H leukodystrophy caused by POLR3A and POLR3B mutations.</strong> Neurology 83: 1898-1905, 2014.[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/25339210/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">25339210</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=25339210[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>] [<a href="https://doi.org/10.1212/WNL.0000000000001002" target="_blank" onclick="gtag('event', 'mim_outbound', {'destination': 'Publisher'})">Full Text</a>]" pmid="25339210">Wolf et al. (2014)</a> concluded that 4H syndrome is an insidiously progressive neurologic disorder with declining motor function of variable severity, but dental abnormalities and hypogonadism are not obligatory for the diagnosis. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25339210" 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="https://doi.org/10.1002/ajmg.1320410417" target="_blank">Full Text</a>]
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<strong>Mutations in POLR3A and POLR3B are a major cause of hypomyelinating leukodystrophies with or without dental abnormalities and/or hypogonadotropic hypogonadism.</strong>
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/23355746/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">23355746</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=23355746" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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[<a href="https://doi.org/10.1136/jmedgenet-2012-101357" target="_blank">Full Text</a>]
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Ghoumid, J., Petit, F., Boute-Benejean, O., Frenois, F., Cartigny, M., Vanlerberghe, C., Smol, T., Caumes, R., de Roux, N., Manouvrier-Hanu, S.
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<strong>Cerebellar hypoplasia with endosteal sclerosis is a POLR3-related disorder.</strong>
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Europ. J. Hum. Genet. 25: 1011-1014, 2017.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/28589944/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">28589944</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=28589944[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=28589944" 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/10.1038/ejhg.2017.73" target="_blank">Full Text</a>]
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Ozgen, H. M., Overweg-Plandsoen, W. C. G., Blees-Pelk, J., Besselaar, P. P., Hennekam, R. C. M.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/15672385/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">15672385</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15672385" 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.30589" target="_blank">Full Text</a>]
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Richards, M. R., Plummer, L., Chan, Y.-M., Lippincott, M. F., Quinton, R., Kumanov, P., Seminara, S. B.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/27512013/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">27512013</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=27512013[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=27512013" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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[<a href="https://doi.org/10.1136/jmedgenet-2016-104064" target="_blank">Full Text</a>]
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Saitsu, H., Osaka, H., Sasaki, M., Takanashi, J., Hamada, K., Yamashita, A., Shibayama, H., Shiina, M., Kondo, Y., Nishiyama, K., Tsurusaki, Y., Miyake, N., Doi, H., Ogata, K., Inoue, K., Matsumoto, N.
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[<a href="https://doi.org/10.1016/j.ajhg.2011.10.003" target="_blank">Full Text</a>]
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Tetreault, M., Choquet, K., Orcesi, S., Tonduti, D., Balottin, U., Teichmann, M., Fribourg, S., Schiffmann, R., Brais, B., Vanderver, A., Bernard, G.
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<strong>Recessive mutations in POLR3B, encoding the second largest subunit of pol III, cause a rare hypomyelinating leukodystrophy.</strong>
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Am. J. Hum. Genet. 89: 652-655, 2011.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/22036172/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">22036172</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=22036172[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=22036172" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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[<a href="https://doi.org/10.1016/j.ajhg.2011.10.006" target="_blank">Full Text</a>]
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Verberne, E. A., Dalen Meurs, L., Wolf, N. I., 4H leukodystrophy caused by a homozygous POLR3B mutation.
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<strong>further delineation of the phenotype.</strong>
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Am. J. Med. Genet. 182A: 1776-1779, 2020.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/32319736/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">32319736</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=32319736[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=32319736" 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.61600" target="_blank">Full Text</a>]
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Wolf, N. I., Vanderver, A., van Spaendonk, R. M. L., Schiffmann, R., Brais, B., Bugiani, M., Sistermans, E., Catsman-Berrevoets, C., Kros, J. M., Soares Pinto, P., Pohl, D., Tirupathi, S., and 10 others.
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<strong>Clinical spectrum of 4H leukodystrophy caused by POLR3A and POLR3B mutations.</strong>
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Neurology 83: 1898-1905, 2014.
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/25339210/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">25339210</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=25339210[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25339210" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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[<a href="https://doi.org/10.1212/WNL.0000000000001002" target="_blank">Full Text</a>]
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Hilary J. Vernon - updated : 03/04/2022
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Marla J. F. O'Neill - updated : 07/09/2018<br>Cassandra L. Kniffin - updated : 9/8/2015
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Cassandra L. Kniffin : 12/7/2011
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carol : 05/09/2024
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carol : 03/04/2022<br>carol : 02/08/2022<br>alopez : 07/09/2018<br>carol : 10/27/2016<br>alopez : 09/15/2015<br>ckniffin : 9/8/2015<br>carol : 6/20/2014<br>ckniffin : 6/19/2014<br>terry : 12/9/2011<br>carol : 12/8/2011<br>ckniffin : 12/7/2011
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<strong>#</strong> 614381
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LEUKODYSTROPHY, HYPOMYELINATING, 8, WITH OR WITHOUT OLIGODONTIA AND/OR HYPOGONADOTROPIC HYPOGONADISM; HLD8
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4H LEUKODYSTROPHY 2<br />
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CEREBELLAR HYPOPLASIA WITH ENDOSTEAL SCLEROSIS
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<strong>ORPHA:</strong> 85186, 88637;
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<strong>DO:</strong> 0060797;
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12q23.3
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Leukodystrophy, hypomyelinating, 8, with or without oligodontia and/or hypogonadotropic hypogonadism
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614381
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Autosomal recessive
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3
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POLR3B
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614366
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<p>A number sign (#) is used with this entry because of evidence that hypomyelinating leukodystrophy-8 (HLD8) is caused by compound heterozygous mutation in the POLR3B gene (614366) on chromosome 12q23.</p>
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<p>Hypomyelinating leukodystrophy-8 (HLD8) is an autosomal recessive neurologic disorder characterized by early childhood onset of cerebellar ataxia and mild intellectual disabilities associated with diffuse hypomyelination apparent on brain MRI. Variable features include oligodontia and/or hypogonadotropic hypogonadism (summary by Tetreault et al., 2011). </p><p>See also HLD7 (607694), which has similar features and is caused by mutation in the POLR3A gene (614258) on chromosome 10q22. The POLR3A and POLR3B genes encode the 2 largest subunits of RNA polymerase III.</p><p>For a general phenotypic description and a discussion of genetic heterogeneity of hypomyelinating leukodystrophy, see 312080.</p>
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<p>Cerebellar hypoplasia with endosteal sclerosis appears to have been described first by Stoll et al. (1986). The parents in this case were consanguineous. </p><p>Charrow et al. (1991) described a brother and sister and an unrelated boy with congenital cerebellar hypoplasia and endosteal sclerosis. All 3 children presented with ataxia and developmental delay and were found to have microcephaly, short stature, oligodontia, strabismus, nystagmus, and congenital hip dislocation. </p><p>Ozgen et al. (2005) described 11-year follow-up of an affected girl whose major clinical symptoms were cerebellar hypoplasia causing ataxia, hypotonia, mild to moderate developmental delay, growth retardation, endosteal sclerosis, tooth eruption disturbances, and hip dislocations. The endosteal sclerosis remained stationary over time, as did the clinical neurologic symptoms, but neuroradiologic manifestations slowly progressed. Ozgen et al. (2005) concluded that the disorder is probably autosomal recessive. </p><p>Saitsu et al. (2011) reported 3 patients from 2 unrelated nonconsanguineous Japanese families with childhood-onset hypomyelinating leukodystrophy. Two sibs had a very similar phenotype, with normal early infantile development and walking at ages 14 and 15 months, respectively. At age 3 years, 1 showed unstable walking and frequent falls and the other became poor at exercise. They had mildly impaired intellectual development but were able to finish high school. As adults, both had cerebellar signs, including ataxic speech, wide-based ataxic gait, dysdiadochokinesis, and dysmetria, hypotonia, and mild hyperreflexia without extensor plantar responses. However, the motor deterioration was not considered to be progressive. Both also showed signs of hypogonadotropic hypogonadism. Other features included myopia, mild horizontal nystagmus, slowing of smooth-pursuit eye movements, and vertical gaze limitation. Brain MRI showed high-intensity areas in the white matter on T2-weighted images, consistent with diffuse cerebral hypomyelination, as well as cerebellar atrophy, and hypoplastic corpus callosum. A third unrelated patient, previously reported as patient 1 by Sasaki et al. (2009), could still walk in her teens, showed cerebellar signs, mild spasticity, slowing of smooth-pursuit eye movements, vertical gaze limitations, and intellectual disability. She did not have hypogonadism. None of the 3 had hypodontia. </p><p>Tetreault et al. (2011) studied 3 unrelated patients of European descent who had a phenotype consistent with 4H syndrome (HLD7; 607694) but who did not have mutations in the POLR3A gene (614258). All presented in early childhood with mild developmental delays and developed dysarthria as well as progressive motor difficulties, including cerebellar ataxia. Two showed progressive spasticity. Two individuals developed hypogonadotropic hypogonadism, whereas the third was too young to evaluate for endocrine dysfunction. All 3 individuals had teeth abnormalities, such as neonatal upper incisors, delayed eruption of deciduous teeth and permanent teeth, abnormal sequence of eruption, and malposition. Brain MRI showed thin corpus callosum, cerebellar atrophy, and hypomyelination. </p><p>Daoud et al. (2013) reported 7 patients with HLN8. Onset of disease ranged from less than 1 year to 15 years of age. Six of the patients had dental anomalies. Four of the patients had hypogonadotrophic hypogonadism. Upper motor neuron signs were found in 5 of 6 patients for whom this information was available. All of the patients had cerebellar signs. Impaired intellectual development was reported in 4 of 5 patients for whom this information was available. One patient required a wheelchair for mobility. </p><p>Ghoumid et al. (2017) reported a patient with severe cognitive impairment who developed worsening tremor and dysmetria in the first year of life. He had 5 teeth at birth, and when his primary teeth erupted, he was missing 4 superior molars and 2 inferior molars. Radiographs at age 2 years showed vertebral, pelvic, and femoral endosteal sclerosis. At age 15 years, he had growth delay, hypotonia, pyramidal signs, dystonia, optic atrophy, and hypogonadotropic hypogonadism. Brain MRI showed diffuse hypomyelination and severe cerebellar atrophy. </p><p>Verberne et al. (2020) reported a 21-year-old woman who presented at 14 years of age for evaluation of a history of developmental delay and hypoplasia of the cerebellar vermis. She had cerebellar ataxia, impaired intellectual development, dysarthria, intention tremor, hypodontia, myopia, and gaze-evoked nystagmus. Brain MRI at age 17 years demonstrated diffuse hyperintensity of white matter, supratentorial atrophy, and severe cerebellar atrophy. </p>
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<strong>Inheritance</strong>
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<p>The transmission pattern of HLD8 in the families reported by Saitsu et al. (2011) was consistent with autosomal recessive inheritance. </p>
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<strong>Molecular Genetics</strong>
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<p>Using whole-exome sequencing, Saitsu et al. (2011) identified compound heterozygous mutations in the POLR3B gene (614366.0001-614366.0004) in 3 patients from 2 unrelated Japanese families with hypomyelinating leukodystrophy-8. Two of the patients had hypogonadotropic hypogonadism, but none had hypodontia. One of the patients had previously been reported as patient 1 by Sasaki et al. (2009). </p><p>In 3 unrelated patients of European descent with HLD8, Tetreault et al. (2011) identified compound heterozygous mutations in the POLR3B gene (614366.0005-614366.0008). All had hypodontia and 2 developed hypogonadotropic hypogonadism. </p><p>In a cohort of 565 patients with isolated hypogonadotropic hypogonadism, with or without anosmia, Richards et al. (2017) performed whole-exome sequencing and identified 4 patients from 3 unrelated families who were compound heterozygous for rare variants in the POLR3B gene and did not have variants in 7 other ataxia-associated genes. An M415T polymorphism (rs199504211) of unclear pathologic significance was carried by 2 of the patients in addition to another variant in POLR3B; no segregation information was reported in those families. In 2 affected sibs, the V523E variant (614366.0005; rs138249161) and an F400S missense variant in POLR3B were identified, each inherited from an unaffected heterozygous parent. None of the 4 patients were reported to have frank neurologic symptoms at their most recent evaluations in their early 30s, and 1 had a brain MRI at age 23 years that was reported as normal. The authors suggested that a possible reason for the lack of neurodegenerative symptoms might be that the variants identified are less harmful to protein function than those identified in patients with HLD8, and noted that computational programs yielded mixed predictions regarding pathogenicity of the variants. No in vivo or in vitro functional analysis of the variants was reported. </p><p>Daoud et al. (2013) identified compound heterozygous mutations in the POLR3B gene in 7 patients with HLD8. Of the 8 mutations identified, 7 were novel (see, e.g., 614366.0016-614366.0018). Six patients carried the previously identified V523E mutation (614366.0005), which was located on a shared common haplotype in all 6. </p><p>In a 15-year-old boy with HLD8, Ghoumid et al. (2017) identified compound heterozygous mutations in the POLR3B gene: the recurrent V523E mutation and a missense mutation (P925Q; 614366.0015). </p><p>In a 21-year-old woman with HLD8, Verberne et al. (2020) identified homozygosity for the recurrent V523E mutation in the POLR3B gene. </p>
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<p>Wolf et al. (2014) performed a cross-sectional observational study of 105 patients with 4H syndrome, including 43 with mutations in the POLR3A gene and 62 with mutations in the POLR3B gene. Except for the French Canadian patients, who carried a common POLR3A mutation (G672E; 614258.0001), most patients of European descent carried POLR3B mutations. Among all patients, about half had delayed development, including 19 (17%) who were never able to walk independently (4 with POLR3A mutations and 15 and POLR3B mutations). Ten (10%) of patients presented after age 10 years. All patients except one, who was older at the time of diagnosis, had cerebellar signs, such as severe intention tremor, dysmetria, ataxia, abnormal smooth pursuit, and nystagmus. Deterioration of speech and swallowing occurred later. Only a few patients had extrapyramidal signs, mainly dystonia. Cognition varied widely from normal in a few patients to moderate intellectual disability in most. About 20% of patients had seizures. Neurologic deterioration with infection occurred in about half of patients. Dental abnormalities, such as delayed dentition and hypodontia, were common (in 87%). Delayed puberty, in those old enough to assess, occurred in 81% of patients with POLR3A mutations and in 69% of those with POLR3B mutations. Most (87%) patients had severe and often progressive myopia, and about half had short stature. Growth hormone deficiency was found in 5 of 10 patients tested. Brain imaging showed hypomyelination in all patients and cerebellar atrophy in most. Supratentorial atrophy and thin corpus callosum were seen in older patients, reflecting white matter loss. A T2-weighted hypodense dot in the posterior limb of the internal capsule was seen in 70% of patients with POLR3B mutations, but only 13% of those with POLR3A mutations. In general, patients with POLR3A mutations had a more severe disease than those with POLR3B mutations. Two sibs with a homozygous POLR3B V523E mutation (614366.0005) had an exceptionally mild clinical course. Wolf et al. (2014) concluded that 4H syndrome is an insidiously progressive neurologic disorder with declining motor function of variable severity, but dental abnormalities and hypogonadism are not obligatory for the diagnosis. </p>
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<strong>REFERENCES</strong>
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Daoud, H., Tetreault, M., Gibson, W., Guerrero, K., Cohen, A., Gburek-Augustat, J., Synofzik, M., Brais, B., Stevens, C. A., Sanchez-Carpintero, R., Goizet, C., Naidu, S., Vanderver, A., Bernard, G.
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<strong>Mutations in POLR3A and POLR3B are a major cause of hypomyelinating leukodystrophies with or without dental abnormalities and/or hypogonadotropic hypogonadism.</strong>
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<strong>Mutations in POLR3A and POLR3B encoding RNA polymerase III subunits cause an autosomal-recessive hypomyelinating leukoencephalopathy.</strong>
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Stoll, C., Talon, P., Alembik, Y., Levy, J. M.
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<strong>Hypoplasie cerebelleuse congenitale avec lesions osseuses.</strong>
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Tetreault, M., Choquet, K., Orcesi, S., Tonduti, D., Balottin, U., Teichmann, M., Fribourg, S., Schiffmann, R., Brais, B., Vanderver, A., Bernard, G.
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<strong>Recessive mutations in POLR3B, encoding the second largest subunit of pol III, cause a rare hypomyelinating leukodystrophy.</strong>
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Am. J. Hum. Genet. 89: 652-655, 2011.
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Verberne, E. A., Dalen Meurs, L., Wolf, N. I., 4H leukodystrophy caused by a homozygous POLR3B mutation.
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<strong>further delineation of the phenotype.</strong>
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Wolf, N. I., Vanderver, A., van Spaendonk, R. M. L., Schiffmann, R., Brais, B., Bugiani, M., Sistermans, E., Catsman-Berrevoets, C., Kros, J. M., Soares Pinto, P., Pohl, D., Tirupathi, S., and 10 others.
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<strong>Clinical spectrum of 4H leukodystrophy caused by POLR3A and POLR3B mutations.</strong>
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[PubMed: 25339210]
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[Full Text: https://doi.org/10.1212/WNL.0000000000001002]
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Hilary J. Vernon - updated : 03/04/2022<br>Marla J. F. O'Neill - updated : 07/09/2018<br>Cassandra L. Kniffin - updated : 9/8/2015
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