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<title>
Entry
- #245400 - MITOCHONDRIAL DNA DEPLETION SYNDROME 9 (ENCEPHALOMYOPATHIC TYPE WITH METHYLMALONIC ACIDURIA); MTDPS9
- OMIM
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<span class="h4">#245400</span>
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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/245400"><strong>Clinical Synopsis</strong></a>
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<a href="/phenotypicSeries/PS603041"> <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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<li role="presentation" style="margin-left: 1em">
<a href="#inheritance">Inheritance</a>
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<a href="#molecularGenetics">Molecular Genetics</a>
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<a href="#seeAlso"><strong>See Also</strong></a>
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<a href="#references"><strong>References</strong></a>
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<a href="#contributors"><strong>Contributors</strong></a>
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<a href="#creationDate"><strong>Creation Date</strong></a>
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<div><a href="https://clinicaltrials.gov/search?cond=MITOCHONDRIAL DNA DEPLETION SYNDROME 9 (ENCEPHALOMYOPATHIC TYPE WITH METHYLMALONIC ACIDURIA)" 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="http://www.informatics.jax.org/disease/245400" 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>
<div><a href="https://wormbase.org/resources/disease/DOID:0080128" 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>
</div>
</div>
</div>
<div class="panel panel-default" style="margin-top: 0px; border-radius: 0px">
<div class="panel-heading mim-panel-heading" role="tab" id="mimCellLines">
<span class="panel-title">
<span class="small">
<a href="#mimCellLinesLinksFold" id="mimCellLinesLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
<div style="display: table-row">
<div id="mimCellLinesLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">&#9658;</div>
&nbsp;
<div style="display: table-cell;">Cell Lines</div>
</div>
</a>
</span>
</span>
</div>
<div id="mimCellLinesLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel">
<div class="panel-body small mim-panel-body">
<div><a href="https://catalog.coriell.org/Search?q=OmimNum:245400" class="definition" title="Coriell Cell Repositories; cell cultures and DNA derived from cell cultures." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'CCR', 'domain': 'ccr.coriell.org'})">Coriell</a></div>
</div>
</div>
</div>
</div>
</div>
</div>
<span>
<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.">
&nbsp;
</span>
</span>
</div>
<div class="col-lg-8 col-lg-pull-2 col-md-8 col-md-pull-2 col-sm-8 col-sm-pull-2 col-xs-12">
<div>
<a id="title" class="mim-anchor"></a>
<div>
<a id="number" class="mim-anchor"></a>
<div class="text-right">
<a href="#" class="mim-tip-icd" qtip_title="<strong>ICD+</strong>" qtip_text="
<strong>ORPHA:</strong> 17<br />
<strong>DO:</strong> 0080128<br />
">ICD+</a>
</div>
<div>
<span class="h3">
<span class="mim-font mim-tip-hint" title="Phenotype description, molecular basis known">
<span class="text-danger"><strong>#</strong></span>
245400
</span>
</span>
</div>
</div>
<div>
<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
MITOCHONDRIAL DNA DEPLETION SYNDROME 9 (ENCEPHALOMYOPATHIC TYPE WITH METHYLMALONIC ACIDURIA); MTDPS9
</span>
</h3>
</div>
<div>
<br />
</div>
<div>
<a id="alternativeTitles" class="mim-anchor"></a>
<div>
<p>
<span class="mim-font">
<em>Alternative titles; symbols</em>
</span>
</p>
</div>
<div>
<h4>
<span class="mim-font">
LACTIC ACIDOSIS, FATAL INFANTILE, FORMERLY
</span>
</h4>
</div>
</div>
<div>
<br />
</div>
</div>
<div>
<a id="phenotypeMap" class="mim-anchor"></a>
<h4>
<span class="mim-font">
<strong>Phenotype-Gene Relationships</strong>
</span>
</h4>
<div>
<table class="table table-bordered table-condensed table-hover small mim-table-padding">
<thead>
<tr class="active">
<th>
Location
</th>
<th>
Phenotype
</th>
<th>
Phenotype <br /> MIM number
</th>
<th>
Inheritance
</th>
<th>
Phenotype <br /> mapping key
</th>
<th>
Gene/Locus
</th>
<th>
Gene/Locus <br /> MIM number
</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/413?start=-3&limit=10&highlight=413">
2p11.2
</a>
</span>
</td>
<td>
<span class="mim-font">
Mitochondrial DNA depletion syndrome 9 (encephalomyopathic type with methylmalonic aciduria)
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/245400"> 245400 </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">
SUCLG1
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611224"> 611224 </a>
</span>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div>
<div class="btn-group ">
<a href="/clinicalSynopsis/245400" 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>
&nbsp;
<div class="btn-group">
<a href="/phenotypicSeries/PS603041" 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>
&nbsp;
<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/245400" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
<li><a href="/graph/radial/245400" 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> Other </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Failure to thrive <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/432788009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">432788009</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/54840006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">54840006</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/783.41" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">783.41</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0015544&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0015544</a>, <a href="https://bioportal.bioontology.org/search?q=C2315100&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2315100</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001508" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001508</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001508" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001508</a>]</span><br /> -
Poor growth <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1837385&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1837385</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001510" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001510</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001510" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001510</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> Ears </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Hearing impairment (rare) <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/103276001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">103276001</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/15188001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">15188001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/H91.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">H91.9</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/389.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">389.9</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/389" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">389</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1384666&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1384666</a>, <a href="https://bioportal.bioontology.org/search?q=C1550444&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1550444</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000365" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000365</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000365" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000365</a>]</span><br />
</span>
</div>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> RESPIRATORY </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Respiratory insufficiency <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/409622000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">409622000</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/409623005" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">409623005</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/J96.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">J96.9</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1145670&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1145670</a>, <a href="https://bioportal.bioontology.org/search?q=C0035229&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0035229</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002878" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002878</a>, <a href="https://hpo.jax.org/app/browse/term/HP:0002093" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002093</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002093" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002093</a>]</span><br /> -
Respiratory failure <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/409622000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">409622000</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/J96.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">J96.9</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1145670&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1145670</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002878" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002878</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002878" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002878</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> ABDOMEN </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<div>
<span class="h5 mim-font">
<em> Gastrointestinal </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Feeding difficulties <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/78164000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">78164000</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R63.3" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R63.3</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0232466&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0232466</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0011968" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0011968</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0011968" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0011968</a>]</span><br />
</span>
</div>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> SKIN, NAILS, & HAIR </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<div>
<span class="h5 mim-font">
<em> Skin </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Hyperhidrosis <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/312230002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">312230002</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0020458&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0020458</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000975" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000975</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000975" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000975</a>]</span><br />
</span>
</div>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> MUSCLE, SOFT TISSUES </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Hypotonia, axial, severe <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3550481&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3550481</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0008936" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0008936</a>]</span><br /> -
Inability to sit or hold head up <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3550482&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3550482</a>]</span><br /> -
Muscle atrophy <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/88092000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">88092000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0541794&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0541794</a>, <a href="https://bioportal.bioontology.org/search?q=C0026846&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0026846</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003202" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003202</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003202" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003202</a>]</span><br /> -
Cox-negative fibers seen on muscle biopsy <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3550483&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3550483</a>]</span><br /> -
Ragged red fibers <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3275417&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3275417</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003200" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003200</a>]</span><br /> -
Decreased activity and protein levels of respiratory chain complexes I, II, III, and IV <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3550484&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3550484</a>]</span><br /> -
Mitochondrial DNA depletion <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/237995002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">237995002</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0342782&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0342782</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> NEUROLOGIC </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<div>
<span class="h5 mim-font">
<em> Central Nervous System </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Delayed psychomotor development, severe <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1847696&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1847696</a>]</span> <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/224958001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">224958001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/F88" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F88</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001263" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001263</a>]</span><br /> -
Mental retardation, severe <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/40700009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">40700009</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/F72" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F72</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/318.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">318.1</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0036857&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0036857</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0010864" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0010864</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0010864" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0010864</a>]</span><br /> -
Cerebral atrophy <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/278849000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">278849000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0235946&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0235946</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002059" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002059</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002059" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002059</a>]</span><br /> -
Widening of the ventricles <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3550480&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3550480</a>]</span><br /> -
Brain MRI shows lesions in the basal ganglia <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3149361&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3149361</a>]</span><br />
</span>
</div>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> METABOLIC FEATURES </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Lactic acidosis <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/91273001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">91273001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/E87.20" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">E87.20</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0001125&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0001125</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003128" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003128</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003128" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003128</a>]</span><br /> -
Hypoglycemia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/237630007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">237630007</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/271327008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">271327008</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/302866003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">302866003</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/1179458001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">1179458001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/E16.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">E16.2</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/251.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">251.2</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0020615&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0020615</a>, <a href="https://bioportal.bioontology.org/search?q=C5767385&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5767385</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001943" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001943</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001943" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001943</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> LABORATORY ABNORMALITIES </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Methylmalonic aciduria <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/42393006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">42393006</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/E71.120" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">E71.120</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1855119&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1855119</a>, <a href="https://bioportal.bioontology.org/search?q=C0268583&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0268583</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0012120" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0012120</a>, <a href="https://hpo.jax.org/app/browse/term/HP:0002912" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002912</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0012120" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0012120</a>]</span><br /> -
Increased lactate in spinal fluid <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3550486&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3550486</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> MISCELLANEOUS </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Onset in infancy <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1848924&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1848924</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003593" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003593</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003593" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003593</a>]</span><br /> -
Severe disorder <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/64572001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">64572001</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0012634&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0012634</a>]</span><br /> -
Death usually in infancy<br /> -
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 />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> MOLECULAR BASIS </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Caused by mutation in the alpha subunit of succinate-coenzyme A ligase (SUCLG1, <a href="/entry/611224#0001">611224.0001</a>)<br />
</span>
</div>
</div>
</div>
<div class="text-right">
<a href="#mimClinicalSynopsisFold" data-toggle="collapse">&#9650;&nbsp;Close</a>
</div>
</div>
</div>
<div id="mimPhenotypicSeriesFold" class="well well-sm collapse mimSingletonToggleFold">
<div class="small">
<div class="row">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
<h5>
Mitochondrial DNA depletion syndrome
- <a href="/phenotypicSeries/PS603041">PS603041</a>
- 25 Entries
</h5>
</div>
</div>
<div class="row" style="margin-left: 0.125em; margin-right: 0.125em;">
<table class="table table-bordered table-condensed table-hover mim-table-padding">
<thead>
<tr>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Location</strong>
</th>
<th class="col-lg-5 col-md-5 col-sm-5 col-xs-6 text-nowrap">
<strong>Phenotype</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Inheritance</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Phenotype<br />mapping key</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Phenotype<br />MIM number</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Gene/Locus</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Gene/Locus<br />MIM number</strong>
</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/1772?start=-3&limit=10&highlight=1772"> 1q42.13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/621071"> Mitochondrial DNA depletion syndrome 21 </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/621071"> 621071 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/139270"> GUK1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/139270"> 139270 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/131?start=-3&limit=10&highlight=131"> 2p23.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/256810"> Mitochondrial DNA depletion syndrome 6 (hepatocerebral type) </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/256810"> 256810 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/137960"> MPV17 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/137960"> 137960 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/371?start=-3&limit=10&highlight=371"> 2p13.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/251880"> Mitochondrial DNA depletion syndrome 3 (hepatocerebral type) </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/251880"> 251880 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601465"> DGUOK </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601465"> 601465 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/413?start=-3&limit=10&highlight=413"> 2p11.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/245400"> Mitochondrial DNA depletion syndrome 9 (encephalomyopathic type with methylmalonic aciduria) </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/245400"> 245400 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611224"> SUCLG1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611224"> 611224 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/3/975?start=-3&limit=10&highlight=975"> 3q29 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616896"> ?Mitochondrial DNA depletion syndrome 14 (encephalocardiomyopathic type) </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/616896"> 616896 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605290"> OPA1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605290"> 605290 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/4/714?start=-3&limit=10&highlight=714"> 4q35.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/617184"> Mitochondrial DNA depletion syndrome 12A (cardiomyopathic type) AD </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/617184"> 617184 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/103220"> SLC25A4 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/103220"> 103220 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/4/714?start=-3&limit=10&highlight=714"> 4q35.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615418"> Mitochondrial DNA depletion syndrome 12B (cardiomyopathic type) AR </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/615418"> 615418 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/103220"> SLC25A4 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/103220"> 103220 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/6/722?start=-3&limit=10&highlight=722"> 6q16.1-q16.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615471"> Mitochondrial DNA depletion syndrome 13 (encephalomyopathic type) </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/615471"> 615471 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605654"> FBXL4 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605654"> 605654 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/7/21?start=-3&limit=10&highlight=21"> 7p22.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618567"> Mitochondrial DNA depletion syndrome 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/618567"> 618567 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606906"> MRM2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606906"> 606906 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/7/744?start=-3&limit=10&highlight=744"> 7q34 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/212350"> Sengers syndrome </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/212350"> 212350 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610345"> AGK </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610345"> 610345 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/452?start=-3&limit=10&highlight=452"> 8q22.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612075"> Mitochondrial DNA depletion syndrome 8B (MNGIE type) </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/612075"> 612075 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604712"> RRM2B </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604712"> 604712 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/452?start=-3&limit=10&highlight=452"> 8q22.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612075"> Mitochondrial DNA depletion syndrome 8A (encephalomyopathic type with renal tubulopathy) </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/612075"> 612075 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604712"> RRM2B </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604712"> 604712 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/10/214?start=-3&limit=10&highlight=214"> 10q21.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/617156"> ?Mitochondrial DNA depletion syndrome 15 (hepatocerebral type) </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/617156"> 617156 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600438"> TFAM </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600438"> 600438 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/10/489?start=-3&limit=10&highlight=489"> 10q24.31 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/271245"> Mitochondrial DNA depletion syndrome 7 (hepatocerebral type) </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/271245"> 271245 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606075"> TWNK </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606075"> 606075 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/13/158?start=-3&limit=10&highlight=158"> 13q14.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612073"> Mitochondrial DNA depletion syndrome 5 (encephalomyopathic with or without methylmalonic aciduria) </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/612073"> 612073 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603921"> SUCLA2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603921"> 603921 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/182?start=-3&limit=10&highlight=182"> 14q13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618811"> ?Mitochondrial DNA depletion syndrome 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/618811"> 618811 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607571"> SLC25A21 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607571"> 607571 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/15/498?start=-3&limit=10&highlight=498"> 15q26.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613662"> Mitochondrial DNA depletion syndrome 4B (MNGIE type) </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/613662"> 613662 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/174763"> POLG </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/174763"> 174763 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/15/498?start=-3&limit=10&highlight=498"> 15q26.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/203700"> Mitochondrial DNA depletion syndrome 4A (Alpers type) </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/203700"> 203700 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/174763"> POLG </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/174763"> 174763 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/16/511?start=-3&limit=10&highlight=511"> 16q21 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609560"> Mitochondrial DNA depletion syndrome 2 (myopathic type) </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/609560"> 609560 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/188250"> TK2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/188250"> 188250 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/17/413?start=-3&limit=10&highlight=413"> 17q12 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619780"> Mitochondrial DNA depletion syndrome 20 (MNGIE type) </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/619780"> 619780 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600940"> LIG3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600940"> 600940 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/17/857?start=-3&limit=10&highlight=857"> 17q23.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619425"> ?Mitochondrial DNA depletion syndrome 16B (neuroophthalmic type) </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/619425"> 619425 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604983"> POLG2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604983"> 604983 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/17/857?start=-3&limit=10&highlight=857"> 17q23.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618528"> ?Mitochondrial DNA depletion syndrome 16 (hepatic type) </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/618528"> 618528 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604983"> POLG2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604983"> 604983 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/17/1040?start=-3&limit=10&highlight=1040"> 17q25.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618972"> ?Mitochondrial DNA depletion syndrome 19 </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/618972"> 618972 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606794"> SLC25A10 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606794"> 606794 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/20/118?start=-3&limit=10&highlight=118"> 20p11.23 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615084"> Mitochondrial DNA depletion syndrome 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/615084"> 615084 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615076"> MGME1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615076"> 615076 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/22/417?start=-3&limit=10&highlight=417"> 22q13.33 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603041"> Mitochondrial DNA depletion syndrome 1 (MNGIE type) </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/603041"> 603041 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/131222"> TYMP </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/131222"> 131222 </a>
</span>
</td>
</tr>
</tbody>
</table>
</div>
<div class="text-right small">
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<p>A number sign (#) is used with this entry because of evidence that mitochondrial DNA depletion syndrome-9 (MTDPS9) is caused by homozygous or compound heterozygous mutation in the alpha subunit of the succinate-CoA ligase gene (SUCLG1; <a href="/entry/611224">611224</a>) on chromosome 2p11.</p><p>See MTDPS5 (<a href="/entry/612073">612073</a>) for a description of a similar disorder caused by mutation in the beta subunit of the succinate-CoA ligase gene (SUCLA2; <a href="/entry/603921">603921</a>).</p>
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<p>Mitochondrial DNA depletion syndrome-9 (MTDPS9) is a severe autosomal recessive disorder characterized by infantile onset of hypotonia, lactic acidosis, severe psychomotor retardation, progressive neurologic deterioration, and excretion of methylmalonic acid. Some patients die in early infancy (summary by <a href="#10" class="mim-tip-reference" title="Rouzier, C., Le Guedard-Mereuze, S., Fragaki, K., Serre, V., Miro, J., Tuffery-Giraud, S., Chaussenot, A., Bannwarth, S., Caruba, C., Ostergaard, E., Pellissier, J.-F., Richelme, C., Espil, C., Chabrol, B., Paquis-Flucklinger, V. &lt;strong&gt;The severity of phenotype linked to SUCLG1 mutations could be correlated with residual amount of SUCLG1 protein.&lt;/strong&gt; J. Med. Genet. 47: 670-676, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20693550/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;20693550&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jmg.2009.073445&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="20693550">Rouzier et al., 2010</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20693550" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>For a discussion of genetic heterogeneity of mtDNA depletion syndromes, see MTDPS1 (<a href="/entry/603041">603041</a>).</p>
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<p><strong><em>Early Descriptions</em></strong></p><p>
<a href="#4" class="mim-tip-reference" title="Erickson, R. J. &lt;strong&gt;Familial infantile lactic acidosis.&lt;/strong&gt; J. Pediat. 66: 1004-1016, 1965.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/14288452/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;14288452&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/s0022-3476(65)80085-3&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="14288452">Erickson (1965)</a> reported a mentally retarded brother and sister with familial infantile lactic acidosis. They had relatives who died in infancy, perhaps of the same condition. The diagnosis was suggested by discrepancy between total cations and anions in the blood. Treatment consisted of replacing glucose with galactose and administering bicarbonate. <a href="#12" class="mim-tip-reference" title="Worsley, H. E., Brookfield, R. W., Elwood, J. S., Noble, R. L., Taylor, W. H. &lt;strong&gt;Lactic acidosis with necrotizing encephalopathy in two sibs.&lt;/strong&gt; Arch. Dis. Child. 40: 492-501, 1965.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/5829993/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;5829993&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/adc.40.213.492&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="5829993">Worsley et al. (1965)</a> described 2 brothers who presented in the second year of life with ataxia, muscle twitching, and intermittent hyperpnea at rest. The condition progressed with mental deterioration, loss of scalp hair, and death about 6 months after onset. Widespread necrotizing encephalopathy was found at autopsy. Spontaneous increases in lactic acid in the blood were apparently responsible for the hyperpnea. Renal amino aciduria and lowered serum phosphate were also found. They suggested that this was the first description of familial lactic acidosis in young children. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=5829993+14288452" 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="Haworth, J. C., Ford, J. D., Younoszai, M. K. &lt;strong&gt;Familial chronic acidosis due to an error in lactate and pyruvate metabolism.&lt;/strong&gt; Canad. Med. Assoc. J. 97: 773-779, 1967.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/6050895/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;6050895&lt;/a&gt;]" pmid="6050895">Haworth et al. (1967)</a> described an American Indian family in which 3 sibs were mentally retarded and had convulsions, other neurologic abnormalities, muscular hypotonia, obesity, and signs and symptoms of metabolic acidosis. Blood lactate and pyruvate levels were elevated. Five other Indians died before 2 years of age with symptoms suggesting the same disorder. <a href="#1" class="mim-tip-reference" title="Binkiewicz, A., Jungas, R. L., Hochman, H., Senior, B. &lt;strong&gt;Familial idiopathic lactic acidosis--petite mutant disease in man? (Abstract)&lt;/strong&gt; Pediat. Res. 6: 395 only, 1972."None>Binkiewicz et al. (1972)</a> observed 2 sibs with severe physical and mental retardation and lactate levels about 4 times normal. Pyruvate was essentially normal. Metabolic findings suggested impaired oxidation of NADH2 associated with decreased effectiveness of the mitochondrial respiratory chain. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6050895" 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="Brunette, M. G., Delvin, E., Hazel, B., Scriver, C. R. &lt;strong&gt;Thiamine-responsive lactic acidosis in a patient with deficient low-Km pyruvate carboxylase activity in liver.&lt;/strong&gt; Pediatrics 50: 702-711, 1972.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/4343503/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;4343503&lt;/a&gt;]" pmid="4343503">Brunette et al. (1972)</a> studied a thiamine-responsive case of lactic acidosis. Thiamine-dependent pyruvate dehydrogenase activity was normal in leukocytes and cultured skin fibroblasts. There was partial deficiency of biotin-dependent hepatic pyruvate carboxylase activity. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=4343503" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#5" class="mim-tip-reference" title="Goodyer, P. R., Lancaster, G. A. &lt;strong&gt;Inherited lactic acidosis: correction of the defect in cultured fibroblasts.&lt;/strong&gt; Pediat. Res. 18: 1144-1148, 1984.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/6440113/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;6440113&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1203/00006450-198411000-00018&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="6440113">Goodyer and Lancaster (1984)</a> studied fibroblasts from a female with lactic acidosis that was lethal in the newborn period. A brother had succumbed to the same disorder. Although pyruvate dehydrogenase was not reduced in cell sonicates, flux through the enzyme and other mitochondrial multienzyme dehydrogenases was severely impaired in intact cells. Deficient conversion of lactate to carbon dioxide could be repaired by addition to the incubation medium of electron acceptors such as methylene blue or dichlorophenolindophenol. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6440113" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Patients with SUCLG1 Mutations</em></strong></p><p>
<a href="#8" class="mim-tip-reference" title="Ostergaard, E., Christensen, E., Kristensen, E., Mogensen, B., Duno, M., Shoubridge, E. A., Wibrand, F. &lt;strong&gt;Deficiency of the alpha subunit of succinate-coenzyme A ligase causes fatal infantile lactic acidosis with mitochondrial DNA depletion.&lt;/strong&gt; Am. J. Hum. Genet. 81: 383-387, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17668387/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17668387&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17668387[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1086/519222&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17668387">Ostergaard et al. (2007)</a> described patients with fatal infantile lactic acidosis resulting from mutation in the SUCLG1 gene (<a href="/entry/611224#0001">611224.0001</a>). The patients had an exceedingly severe phenotype with antenatal manifestations and severe lactic acidosis in the first day of life and death within 2 to 4 days. Similar findings, i.e., a combined oxidative phosphorylation deficiency and mtDNA depletion (MTDPS5; <a href="/entry/612073">612073</a>), are found in patients with mutation in the SUCLA2 gene (<a href="/entry/603921">603921</a>). However, the phenotypes of patients with SUCLA2 were milder; they were generally healthy at birth but presented with severe hypotonia and muscle weakness at age 3 to 6 months. Subsequently, they developed a Leigh syndrome-like disorder with hearing impairment and dystonia, and they had a life span of up to 21 years. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17668387" 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="Ostergaard, E., Schwartz, M., Batbayli, M., Christensen, E., Hjalmarson, O., Kollberg, G., Holme, E. &lt;strong&gt;A novel missense mutation in SUCLG1 associated with mitochondrial DNA depletion, encephalomyopathic form, with methylmalonic aciduria.&lt;/strong&gt; Europ. J. Pediat. 169: 201-205, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/19526370/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;19526370&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1007/s00431-009-1007-z&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="19526370">Ostergaard et al. (2010)</a> reported a Swedish boy with recessive encephalomyopathic mtDNA depletion syndrome and methylmalonic aciduria due to mutation in the SUCLG1 gene (<a href="/entry/611224#0002">611224.0002</a>). He was born of unrelated parents from the same small rural area in northern Sweden. Development was normal in the first 3 months, but he presented at age 6 months with failure to thrive and severe hypotonia with inability to balance his head. He also had hyperhidrosis. Laboratory studies showed lactic acidosis. He subsequently showed delayed psychomotor development, poor feeding and growth, and hearing impairment. After a gastrointestinal illness at age 2 years, 3 months, he developed severe lactic acidosis, shock, and respiratory insufficiency, leading to death. Serial brain MRI showed progressive, bilateral, increased attenuation of the putamen, globus pallidus, and caudate together with increasing subarachnoid space and widening of the lateral ventricles. Southern blot analysis of muscle tissue showed moderately decreased mtDNA. There was no evidence of cardiomyopathy. <a href="#9" class="mim-tip-reference" title="Ostergaard, E., Schwartz, M., Batbayli, M., Christensen, E., Hjalmarson, O., Kollberg, G., Holme, E. &lt;strong&gt;A novel missense mutation in SUCLG1 associated with mitochondrial DNA depletion, encephalomyopathic form, with methylmalonic aciduria.&lt;/strong&gt; Europ. J. Pediat. 169: 201-205, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/19526370/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;19526370&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1007/s00431-009-1007-z&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="19526370">Ostergaard et al. (2010)</a> noted the phenotypic similarities to fumarase deficiency (<a href="/entry/606812">606812</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=19526370" 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="Rouzier, C., Le Guedard-Mereuze, S., Fragaki, K., Serre, V., Miro, J., Tuffery-Giraud, S., Chaussenot, A., Bannwarth, S., Caruba, C., Ostergaard, E., Pellissier, J.-F., Richelme, C., Espil, C., Chabrol, B., Paquis-Flucklinger, V. &lt;strong&gt;The severity of phenotype linked to SUCLG1 mutations could be correlated with residual amount of SUCLG1 protein.&lt;/strong&gt; J. Med. Genet. 47: 670-676, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20693550/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;20693550&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jmg.2009.073445&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="20693550">Rouzier et al. (2010)</a> reported 2 unrelated affected individuals with this disorder. The first child presented at age 1 day with severe hypotonia, respiratory failure, and hypoglycemia. Laboratory investigations indicated lactic acidosis and excretion of methylmalonic acid. Brain MRI showed symmetric T2-hyperintense lesions of the basal ganglia. At age 7 months, he had severely delayed psychomotor development with no head control and poor spontaneous movements. He presented with recurrent episodes of acidosis and respiratory failure, and died at age 1 year. Skeletal muscle biopsy showed severe mtDNA depletion (11% of controls). The second child presented with severe hypotonia, feeding difficulties, and failure to thrive at age 3 months. He had lactic acidosis and moderate excretion of methylmalonic acid, and later showed lack of head control and severe psychomotor retardation. Although he was alive at age 12 years, he had severe axial hypotonia with no active movements and very atrophic muscles. He needed tube-feeding and permanent respiratory support by tracheotomy. Skeletal muscle biopsy showed markedly reduced activities for respiratory complexes I and IV, and severe mtDNA depletion (18% of controls). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20693550" 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="Chinopoulos, C., Batzios, S., van den Heuvel, L. P., Rodenburg, R., Smeets, R., Waterham, H. R., Turkenburg, M., Ruiter, J. P., Wanders, R. J. A., Doczi, J., Horvath, G., Dobolyi, A., Vargiami, E., Wevers, R. A., Zafeiriou, D. &lt;strong&gt;Mutated SUCLG1 causes mislocalization of SUCLG2 protein, morphological alterations of mitochondria and an early-onset severe neurometabolic disorder.&lt;/strong&gt; Molec. Genet. Metab. 126: 43-52, 2019.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/30470562/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;30470562&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/j.ymgme.2018.11.009&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="30470562">Chinopoulos et al. (2019)</a> reported a female patient who had retardation of gross motor development with generalized hypotonia since 4.5 months of age. She also had a unilateral congenital cataract. Laboratory evaluation showed a mild elevation in transaminases and blood lactate. Brain MRI revealed enlarged subarachnoid spaces and symmetric T2-hyperintense lesions of the basal ganglia. Metabolic testing showed elevated methylmalonic acid and methylcitrate, as well as a slight increase of citric acid cycle intermediates in the urine, and increased 3-hydroxyisovalerylcarnitine and propionylcarnitine in plasma. At 26 months of age she had failure to thrive, psychomotor retardation, progressive severe myopathy, and intermittent dystonic movements. Brain MRI demonstrated bilateral abnormal signal in the putamen and caudate nuclei, severe brain atrophy, and ventriculomegaly. Brainstem auditory evoked potentials showed sensorineural hearing loss. Repeat acylcarnitine profile and urine organic acids showed increased C3 and C4 dicarboxylic carnitines, methylmalonic acid, citric acid cycle intermediates, and 3-OH-isovaleric acid. Quantitation of mtDNA content in muscle demonstrated a mild depletion, and electron transport chain activity in muscle was normal. The patient died at age 3.5 years due to cardiorespiratory failure in the setting of a respiratory tract infection. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30470562" 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 MTDPS9 in the family reported by <a href="#8" class="mim-tip-reference" title="Ostergaard, E., Christensen, E., Kristensen, E., Mogensen, B., Duno, M., Shoubridge, E. A., Wibrand, F. &lt;strong&gt;Deficiency of the alpha subunit of succinate-coenzyme A ligase causes fatal infantile lactic acidosis with mitochondrial DNA depletion.&lt;/strong&gt; Am. J. Hum. Genet. 81: 383-387, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17668387/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17668387&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17668387[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1086/519222&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17668387">Ostergaard et al. (2007)</a> was consistent with autosomal recessive inheritance. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17668387" 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 id="molecularGenetics" class="mim-anchor"></a>
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<strong>Molecular Genetics</strong>
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<p>In a consanguineous family of Pakistani origin with autosomal recessive fatal infantile lactic acidosis, <a href="#8" class="mim-tip-reference" title="Ostergaard, E., Christensen, E., Kristensen, E., Mogensen, B., Duno, M., Shoubridge, E. A., Wibrand, F. &lt;strong&gt;Deficiency of the alpha subunit of succinate-coenzyme A ligase causes fatal infantile lactic acidosis with mitochondrial DNA depletion.&lt;/strong&gt; Am. J. Hum. Genet. 81: 383-387, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17668387/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17668387&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17668387[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1086/519222&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17668387">Ostergaard et al. (2007)</a> found a combined respiratory chain enzyme deficiency associated with mitochondrial DNA depletion. To identify the disease-causing gene, they performed single-nucleotide polymorphism (SNP) homozygosity mapping and found homozygous regions on 4 chromosomes. DNA sequencing revealed a homozygous 2-bp deletion in SUCLG1 (<a href="/entry/611224#0001">611224.0001</a>), a gene that encodes the alpha subunit of the Krebs cycle enzyme succinate-coenzyme A ligase (SUCL). The mtDNA depletion was thought to be explained by decreased mitochondrial nucleoside diphosphate kinase (NDPK; see <a href="/entry/156491">156491</a>) activity resulting from the inability of NDPK to form a complex with SUCL. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17668387" 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 patients with encephalomyopathic mtDNA depletion and methylmalonic aciduria, <a href="#9" class="mim-tip-reference" title="Ostergaard, E., Schwartz, M., Batbayli, M., Christensen, E., Hjalmarson, O., Kollberg, G., Holme, E. &lt;strong&gt;A novel missense mutation in SUCLG1 associated with mitochondrial DNA depletion, encephalomyopathic form, with methylmalonic aciduria.&lt;/strong&gt; Europ. J. Pediat. 169: 201-205, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/19526370/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;19526370&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1007/s00431-009-1007-z&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="19526370">Ostergaard et al. (2010)</a> and <a href="#10" class="mim-tip-reference" title="Rouzier, C., Le Guedard-Mereuze, S., Fragaki, K., Serre, V., Miro, J., Tuffery-Giraud, S., Chaussenot, A., Bannwarth, S., Caruba, C., Ostergaard, E., Pellissier, J.-F., Richelme, C., Espil, C., Chabrol, B., Paquis-Flucklinger, V. &lt;strong&gt;The severity of phenotype linked to SUCLG1 mutations could be correlated with residual amount of SUCLG1 protein.&lt;/strong&gt; J. Med. Genet. 47: 670-676, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20693550/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;20693550&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jmg.2009.073445&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="20693550">Rouzier et al. (2010)</a> identified mutations in the SUCLG1 gene (<a href="/entry/611224#0002">611224.0002</a>-<a href="/entry/611224#0005">611224.0005</a>). One patient with a slightly milder phenotype and survival to age 12 years was heterozygous for a truncating mutation and had some residual enzyme activity. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=19526370+20693550" 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 female child with MTDPS9, <a href="#3" class="mim-tip-reference" title="Chinopoulos, C., Batzios, S., van den Heuvel, L. P., Rodenburg, R., Smeets, R., Waterham, H. R., Turkenburg, M., Ruiter, J. P., Wanders, R. J. A., Doczi, J., Horvath, G., Dobolyi, A., Vargiami, E., Wevers, R. A., Zafeiriou, D. &lt;strong&gt;Mutated SUCLG1 causes mislocalization of SUCLG2 protein, morphological alterations of mitochondria and an early-onset severe neurometabolic disorder.&lt;/strong&gt; Molec. Genet. Metab. 126: 43-52, 2019.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/30470562/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;30470562&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/j.ymgme.2018.11.009&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="30470562">Chinopoulos et al. (2019)</a> identified a mutation in the SUCLG1 gene (A209E; <a href="/entry/611224#0006">611224.0006</a>) that was heterozygous at the genomic DNA level but homozygous at the transcriptional level. The mutation, which was found by Sanger sequencing, was present in heterozygous state in the father; an unknown ovary donor had been used for in vitro fertilization. Testing in patient fibroblasts showed absence of detectable SUCLG1 protein and decreased mitochondrial substrate-level phosphorylation. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30470562" 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 id="seeAlso" class="mim-anchor"></a>
<h4 href="#mimSeeAlsoFold" id="mimSeeAlsoToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span class="mim-font">
<span id="mimSeeAlsoToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<strong>See Also:</strong>
</span>
</h4>
<div id="mimSeeAlsoFold" class="collapse in mimTextToggleFold">
<span class="mim-text-font">
<a href="#Lie1971" class="mim-tip-reference" title="Lie, S. O., Loken, A. C., Stromme, J. H., Aagenaes, O. &lt;strong&gt;Fatal congenital lactic acidosis in two siblings. I. Clinical and pathological studies.&lt;/strong&gt; Acta Paediat. Scand. 60: 129-137, 1971.">Lie et al. (1971)</a>; <a href="#Skrede1971" class="mim-tip-reference" title="Skrede, S., Stromme, J. H., Stokke, O., Lie, S. O., Eldjarn, L. &lt;strong&gt;Fatal congenital lactic acidosis in two siblings. II. Biochemical studies in vivo and vitro.&lt;/strong&gt; Acta Paediat. Scand. 60: 138-145, 1971.">Skrede et al. (1971)</a>
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<a id="references"class="mim-anchor"></a>
<h4 href="#mimReferencesFold" id="mimReferencesToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span class="mim-font">
<span id="mimReferencesToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<strong>REFERENCES</strong>
</span>
</h4>
<div>
<p />
</div>
<div id="mimReferencesFold" class="collapse in mimTextToggleFold">
<ol>
<li>
<a id="1" class="mim-anchor"></a>
<a id="Binkiewicz1972" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Binkiewicz, A., Jungas, R. L., Hochman, H., Senior, B.
<strong>Familial idiopathic lactic acidosis--petite mutant disease in man? (Abstract)</strong>
Pediat. Res. 6: 395 only, 1972.
</p>
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</li>
<li>
<a id="2" class="mim-anchor"></a>
<a id="Brunette1972" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Brunette, M. G., Delvin, E., Hazel, B., Scriver, C. R.
<strong>Thiamine-responsive lactic acidosis in a patient with deficient low-Km pyruvate carboxylase activity in liver.</strong>
Pediatrics 50: 702-711, 1972.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/4343503/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">4343503</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=4343503" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
</p>
</div>
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<li>
<a id="3" class="mim-anchor"></a>
<a id="Chinopoulos2019" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Chinopoulos, C., Batzios, S., van den Heuvel, L. P., Rodenburg, R., Smeets, R., Waterham, H. R., Turkenburg, M., Ruiter, J. P., Wanders, R. J. A., Doczi, J., Horvath, G., Dobolyi, A., Vargiami, E., Wevers, R. A., Zafeiriou, D.
<strong>Mutated SUCLG1 causes mislocalization of SUCLG2 protein, morphological alterations of mitochondria and an early-onset severe neurometabolic disorder.</strong>
Molec. Genet. Metab. 126: 43-52, 2019.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/30470562/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">30470562</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=30470562" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1016/j.ymgme.2018.11.009" target="_blank">Full Text</a>]
</p>
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<a id="4" class="mim-anchor"></a>
<a id="Erickson1965" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Erickson, R. J.
<strong>Familial infantile lactic acidosis.</strong>
J. Pediat. 66: 1004-1016, 1965.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/14288452/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">14288452</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=14288452" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1016/s0022-3476(65)80085-3" target="_blank">Full Text</a>]
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<a id="5" class="mim-anchor"></a>
<a id="Goodyer1984" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Goodyer, P. R., Lancaster, G. A.
<strong>Inherited lactic acidosis: correction of the defect in cultured fibroblasts.</strong>
Pediat. Res. 18: 1144-1148, 1984.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6440113/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6440113</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6440113" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1203/00006450-198411000-00018" target="_blank">Full Text</a>]
</p>
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<a id="Haworth1967" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Haworth, J. C., Ford, J. D., Younoszai, M. K.
<strong>Familial chronic acidosis due to an error in lactate and pyruvate metabolism.</strong>
Canad. Med. Assoc. J. 97: 773-779, 1967.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/6050895/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">6050895</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=6050895" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
</p>
</div>
</li>
<li>
<a id="7" class="mim-anchor"></a>
<a id="Lie1971" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Lie, S. O., Loken, A. C., Stromme, J. H., Aagenaes, O.
<strong>Fatal congenital lactic acidosis in two siblings. I. Clinical and pathological studies.</strong>
Acta Paediat. Scand. 60: 129-137, 1971.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5548117/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5548117</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=5548117" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1111/j.1651-2227.1971.tb06632.x" target="_blank">Full Text</a>]
</p>
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</li>
<li>
<a id="8" class="mim-anchor"></a>
<a id="Ostergaard2007" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Ostergaard, E., Christensen, E., Kristensen, E., Mogensen, B., Duno, M., Shoubridge, E. A., Wibrand, F.
<strong>Deficiency of the alpha subunit of succinate-coenzyme A ligase causes fatal infantile lactic acidosis with mitochondrial DNA depletion.</strong>
Am. J. Hum. Genet. 81: 383-387, 2007.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17668387/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17668387</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=17668387[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=17668387" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1086/519222" target="_blank">Full Text</a>]
</p>
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</li>
<li>
<a id="9" class="mim-anchor"></a>
<a id="Ostergaard2010" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Ostergaard, E., Schwartz, M., Batbayli, M., Christensen, E., Hjalmarson, O., Kollberg, G., Holme, E.
<strong>A novel missense mutation in SUCLG1 associated with mitochondrial DNA depletion, encephalomyopathic form, with methylmalonic aciduria.</strong>
Europ. J. Pediat. 169: 201-205, 2010.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19526370/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19526370</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=19526370" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1007/s00431-009-1007-z" target="_blank">Full Text</a>]
</p>
</div>
</li>
<li>
<a id="10" class="mim-anchor"></a>
<a id="Rouzier2010" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Rouzier, C., Le Guedard-Mereuze, S., Fragaki, K., Serre, V., Miro, J., Tuffery-Giraud, S., Chaussenot, A., Bannwarth, S., Caruba, C., Ostergaard, E., Pellissier, J.-F., Richelme, C., Espil, C., Chabrol, B., Paquis-Flucklinger, V.
<strong>The severity of phenotype linked to SUCLG1 mutations could be correlated with residual amount of SUCLG1 protein.</strong>
J. Med. Genet. 47: 670-676, 2010.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/20693550/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">20693550</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20693550" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1136/jmg.2009.073445" target="_blank">Full Text</a>]
</p>
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<a id="11" class="mim-anchor"></a>
<a id="Skrede1971" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Skrede, S., Stromme, J. H., Stokke, O., Lie, S. O., Eldjarn, L.
<strong>Fatal congenital lactic acidosis in two siblings. II. Biochemical studies in vivo and vitro.</strong>
Acta Paediat. Scand. 60: 138-145, 1971.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5548118/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5548118</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=5548118" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1111/j.1651-2227.1971.tb06633.x" target="_blank">Full Text</a>]
</p>
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<a id="12" class="mim-anchor"></a>
<a id="Worsley1965" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Worsley, H. E., Brookfield, R. W., Elwood, J. S., Noble, R. L., Taylor, W. H.
<strong>Lactic acidosis with necrotizing encephalopathy in two sibs.</strong>
Arch. Dis. Child. 40: 492-501, 1965.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/5829993/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">5829993</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=5829993" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1136/adc.40.213.492" target="_blank">Full Text</a>]
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Hilary J. Vernon - updated : 06/07/2021
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Cassandra L. Kniffin - updated : 12/9/2010<br>Cassandra L. Kniffin - updated : 11/22/2010<br>Victor A. McKusick - updated : 8/16/2007
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Victor A. McKusick : 6/3/1986
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<h3>
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<strong>#</strong> 245400
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<span class="mim-font">
MITOCHONDRIAL DNA DEPLETION SYNDROME 9 (ENCEPHALOMYOPATHIC TYPE WITH METHYLMALONIC ACIDURIA); MTDPS9
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<em>Alternative titles; symbols</em>
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LACTIC ACIDOSIS, FATAL INFANTILE, FORMERLY
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<strong>ORPHA:</strong> 17; &nbsp;
<strong>DO:</strong> 0080128; &nbsp;
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<strong>Phenotype-Gene Relationships</strong>
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Location
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Phenotype
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Phenotype <br /> MIM number
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Inheritance
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Phenotype <br /> mapping key
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Gene/Locus
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Gene/Locus <br /> MIM number
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2p11.2
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Mitochondrial DNA depletion syndrome 9 (encephalomyopathic type with methylmalonic aciduria)
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245400
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Autosomal recessive
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3
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SUCLG1
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611224
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<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because of evidence that mitochondrial DNA depletion syndrome-9 (MTDPS9) is caused by homozygous or compound heterozygous mutation in the alpha subunit of the succinate-CoA ligase gene (SUCLG1; 611224) on chromosome 2p11.</p><p>See MTDPS5 (612073) for a description of a similar disorder caused by mutation in the beta subunit of the succinate-CoA ligase gene (SUCLA2; 603921).</p>
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<strong>Description</strong>
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<p>Mitochondrial DNA depletion syndrome-9 (MTDPS9) is a severe autosomal recessive disorder characterized by infantile onset of hypotonia, lactic acidosis, severe psychomotor retardation, progressive neurologic deterioration, and excretion of methylmalonic acid. Some patients die in early infancy (summary by Rouzier et al., 2010). </p><p>For a discussion of genetic heterogeneity of mtDNA depletion syndromes, see MTDPS1 (603041).</p>
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<strong>Clinical Features</strong>
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<p><strong><em>Early Descriptions</em></strong></p><p>
Erickson (1965) reported a mentally retarded brother and sister with familial infantile lactic acidosis. They had relatives who died in infancy, perhaps of the same condition. The diagnosis was suggested by discrepancy between total cations and anions in the blood. Treatment consisted of replacing glucose with galactose and administering bicarbonate. Worsley et al. (1965) described 2 brothers who presented in the second year of life with ataxia, muscle twitching, and intermittent hyperpnea at rest. The condition progressed with mental deterioration, loss of scalp hair, and death about 6 months after onset. Widespread necrotizing encephalopathy was found at autopsy. Spontaneous increases in lactic acid in the blood were apparently responsible for the hyperpnea. Renal amino aciduria and lowered serum phosphate were also found. They suggested that this was the first description of familial lactic acidosis in young children. </p><p>Haworth et al. (1967) described an American Indian family in which 3 sibs were mentally retarded and had convulsions, other neurologic abnormalities, muscular hypotonia, obesity, and signs and symptoms of metabolic acidosis. Blood lactate and pyruvate levels were elevated. Five other Indians died before 2 years of age with symptoms suggesting the same disorder. Binkiewicz et al. (1972) observed 2 sibs with severe physical and mental retardation and lactate levels about 4 times normal. Pyruvate was essentially normal. Metabolic findings suggested impaired oxidation of NADH2 associated with decreased effectiveness of the mitochondrial respiratory chain. </p><p>Brunette et al. (1972) studied a thiamine-responsive case of lactic acidosis. Thiamine-dependent pyruvate dehydrogenase activity was normal in leukocytes and cultured skin fibroblasts. There was partial deficiency of biotin-dependent hepatic pyruvate carboxylase activity. </p><p>Goodyer and Lancaster (1984) studied fibroblasts from a female with lactic acidosis that was lethal in the newborn period. A brother had succumbed to the same disorder. Although pyruvate dehydrogenase was not reduced in cell sonicates, flux through the enzyme and other mitochondrial multienzyme dehydrogenases was severely impaired in intact cells. Deficient conversion of lactate to carbon dioxide could be repaired by addition to the incubation medium of electron acceptors such as methylene blue or dichlorophenolindophenol. </p><p><strong><em>Patients with SUCLG1 Mutations</em></strong></p><p>
Ostergaard et al. (2007) described patients with fatal infantile lactic acidosis resulting from mutation in the SUCLG1 gene (611224.0001). The patients had an exceedingly severe phenotype with antenatal manifestations and severe lactic acidosis in the first day of life and death within 2 to 4 days. Similar findings, i.e., a combined oxidative phosphorylation deficiency and mtDNA depletion (MTDPS5; 612073), are found in patients with mutation in the SUCLA2 gene (603921). However, the phenotypes of patients with SUCLA2 were milder; they were generally healthy at birth but presented with severe hypotonia and muscle weakness at age 3 to 6 months. Subsequently, they developed a Leigh syndrome-like disorder with hearing impairment and dystonia, and they had a life span of up to 21 years. </p><p>Ostergaard et al. (2010) reported a Swedish boy with recessive encephalomyopathic mtDNA depletion syndrome and methylmalonic aciduria due to mutation in the SUCLG1 gene (611224.0002). He was born of unrelated parents from the same small rural area in northern Sweden. Development was normal in the first 3 months, but he presented at age 6 months with failure to thrive and severe hypotonia with inability to balance his head. He also had hyperhidrosis. Laboratory studies showed lactic acidosis. He subsequently showed delayed psychomotor development, poor feeding and growth, and hearing impairment. After a gastrointestinal illness at age 2 years, 3 months, he developed severe lactic acidosis, shock, and respiratory insufficiency, leading to death. Serial brain MRI showed progressive, bilateral, increased attenuation of the putamen, globus pallidus, and caudate together with increasing subarachnoid space and widening of the lateral ventricles. Southern blot analysis of muscle tissue showed moderately decreased mtDNA. There was no evidence of cardiomyopathy. Ostergaard et al. (2010) noted the phenotypic similarities to fumarase deficiency (606812). </p><p>Rouzier et al. (2010) reported 2 unrelated affected individuals with this disorder. The first child presented at age 1 day with severe hypotonia, respiratory failure, and hypoglycemia. Laboratory investigations indicated lactic acidosis and excretion of methylmalonic acid. Brain MRI showed symmetric T2-hyperintense lesions of the basal ganglia. At age 7 months, he had severely delayed psychomotor development with no head control and poor spontaneous movements. He presented with recurrent episodes of acidosis and respiratory failure, and died at age 1 year. Skeletal muscle biopsy showed severe mtDNA depletion (11% of controls). The second child presented with severe hypotonia, feeding difficulties, and failure to thrive at age 3 months. He had lactic acidosis and moderate excretion of methylmalonic acid, and later showed lack of head control and severe psychomotor retardation. Although he was alive at age 12 years, he had severe axial hypotonia with no active movements and very atrophic muscles. He needed tube-feeding and permanent respiratory support by tracheotomy. Skeletal muscle biopsy showed markedly reduced activities for respiratory complexes I and IV, and severe mtDNA depletion (18% of controls). </p><p>Chinopoulos et al. (2019) reported a female patient who had retardation of gross motor development with generalized hypotonia since 4.5 months of age. She also had a unilateral congenital cataract. Laboratory evaluation showed a mild elevation in transaminases and blood lactate. Brain MRI revealed enlarged subarachnoid spaces and symmetric T2-hyperintense lesions of the basal ganglia. Metabolic testing showed elevated methylmalonic acid and methylcitrate, as well as a slight increase of citric acid cycle intermediates in the urine, and increased 3-hydroxyisovalerylcarnitine and propionylcarnitine in plasma. At 26 months of age she had failure to thrive, psychomotor retardation, progressive severe myopathy, and intermittent dystonic movements. Brain MRI demonstrated bilateral abnormal signal in the putamen and caudate nuclei, severe brain atrophy, and ventriculomegaly. Brainstem auditory evoked potentials showed sensorineural hearing loss. Repeat acylcarnitine profile and urine organic acids showed increased C3 and C4 dicarboxylic carnitines, methylmalonic acid, citric acid cycle intermediates, and 3-OH-isovaleric acid. Quantitation of mtDNA content in muscle demonstrated a mild depletion, and electron transport chain activity in muscle was normal. The patient died at age 3.5 years due to cardiorespiratory failure in the setting of a respiratory tract infection. </p>
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<strong>Inheritance</strong>
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<p>The transmission pattern of MTDPS9 in the family reported by Ostergaard et al. (2007) was consistent with autosomal recessive inheritance. </p>
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<strong>Molecular Genetics</strong>
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<p>In a consanguineous family of Pakistani origin with autosomal recessive fatal infantile lactic acidosis, Ostergaard et al. (2007) found a combined respiratory chain enzyme deficiency associated with mitochondrial DNA depletion. To identify the disease-causing gene, they performed single-nucleotide polymorphism (SNP) homozygosity mapping and found homozygous regions on 4 chromosomes. DNA sequencing revealed a homozygous 2-bp deletion in SUCLG1 (611224.0001), a gene that encodes the alpha subunit of the Krebs cycle enzyme succinate-coenzyme A ligase (SUCL). The mtDNA depletion was thought to be explained by decreased mitochondrial nucleoside diphosphate kinase (NDPK; see 156491) activity resulting from the inability of NDPK to form a complex with SUCL. </p><p>In patients with encephalomyopathic mtDNA depletion and methylmalonic aciduria, Ostergaard et al. (2010) and Rouzier et al. (2010) identified mutations in the SUCLG1 gene (611224.0002-611224.0005). One patient with a slightly milder phenotype and survival to age 12 years was heterozygous for a truncating mutation and had some residual enzyme activity. </p><p>In a female child with MTDPS9, Chinopoulos et al. (2019) identified a mutation in the SUCLG1 gene (A209E; 611224.0006) that was heterozygous at the genomic DNA level but homozygous at the transcriptional level. The mutation, which was found by Sanger sequencing, was present in heterozygous state in the father; an unknown ovary donor had been used for in vitro fertilization. Testing in patient fibroblasts showed absence of detectable SUCLG1 protein and decreased mitochondrial substrate-level phosphorylation. </p>
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<strong>See Also:</strong>
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<span class="mim-text-font">
Lie et al. (1971); Skrede et al. (1971)
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<strong>REFERENCES</strong>
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<p class="mim-text-font">
Binkiewicz, A., Jungas, R. L., Hochman, H., Senior, B.
<strong>Familial idiopathic lactic acidosis--petite mutant disease in man? (Abstract)</strong>
Pediat. Res. 6: 395 only, 1972.
</p>
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Brunette, M. G., Delvin, E., Hazel, B., Scriver, C. R.
<strong>Thiamine-responsive lactic acidosis in a patient with deficient low-Km pyruvate carboxylase activity in liver.</strong>
Pediatrics 50: 702-711, 1972.
[PubMed: 4343503]
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<li>
<p class="mim-text-font">
Chinopoulos, C., Batzios, S., van den Heuvel, L. P., Rodenburg, R., Smeets, R., Waterham, H. R., Turkenburg, M., Ruiter, J. P., Wanders, R. J. A., Doczi, J., Horvath, G., Dobolyi, A., Vargiami, E., Wevers, R. A., Zafeiriou, D.
<strong>Mutated SUCLG1 causes mislocalization of SUCLG2 protein, morphological alterations of mitochondria and an early-onset severe neurometabolic disorder.</strong>
Molec. Genet. Metab. 126: 43-52, 2019.
[PubMed: 30470562]
[Full Text: https://doi.org/10.1016/j.ymgme.2018.11.009]
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<li>
<p class="mim-text-font">
Erickson, R. J.
<strong>Familial infantile lactic acidosis.</strong>
J. Pediat. 66: 1004-1016, 1965.
[PubMed: 14288452]
[Full Text: https://doi.org/10.1016/s0022-3476(65)80085-3]
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Goodyer, P. R., Lancaster, G. A.
<strong>Inherited lactic acidosis: correction of the defect in cultured fibroblasts.</strong>
Pediat. Res. 18: 1144-1148, 1984.
[PubMed: 6440113]
[Full Text: https://doi.org/10.1203/00006450-198411000-00018]
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Haworth, J. C., Ford, J. D., Younoszai, M. K.
<strong>Familial chronic acidosis due to an error in lactate and pyruvate metabolism.</strong>
Canad. Med. Assoc. J. 97: 773-779, 1967.
[PubMed: 6050895]
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<p class="mim-text-font">
Lie, S. O., Loken, A. C., Stromme, J. H., Aagenaes, O.
<strong>Fatal congenital lactic acidosis in two siblings. I. Clinical and pathological studies.</strong>
Acta Paediat. Scand. 60: 129-137, 1971.
[PubMed: 5548117]
[Full Text: https://doi.org/10.1111/j.1651-2227.1971.tb06632.x]
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Ostergaard, E., Christensen, E., Kristensen, E., Mogensen, B., Duno, M., Shoubridge, E. A., Wibrand, F.
<strong>Deficiency of the alpha subunit of succinate-coenzyme A ligase causes fatal infantile lactic acidosis with mitochondrial DNA depletion.</strong>
Am. J. Hum. Genet. 81: 383-387, 2007.
[PubMed: 17668387]
[Full Text: https://doi.org/10.1086/519222]
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Ostergaard, E., Schwartz, M., Batbayli, M., Christensen, E., Hjalmarson, O., Kollberg, G., Holme, E.
<strong>A novel missense mutation in SUCLG1 associated with mitochondrial DNA depletion, encephalomyopathic form, with methylmalonic aciduria.</strong>
Europ. J. Pediat. 169: 201-205, 2010.
[PubMed: 19526370]
[Full Text: https://doi.org/10.1007/s00431-009-1007-z]
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Rouzier, C., Le Guedard-Mereuze, S., Fragaki, K., Serre, V., Miro, J., Tuffery-Giraud, S., Chaussenot, A., Bannwarth, S., Caruba, C., Ostergaard, E., Pellissier, J.-F., Richelme, C., Espil, C., Chabrol, B., Paquis-Flucklinger, V.
<strong>The severity of phenotype linked to SUCLG1 mutations could be correlated with residual amount of SUCLG1 protein.</strong>
J. Med. Genet. 47: 670-676, 2010.
[PubMed: 20693550]
[Full Text: https://doi.org/10.1136/jmg.2009.073445]
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<p class="mim-text-font">
Skrede, S., Stromme, J. H., Stokke, O., Lie, S. O., Eldjarn, L.
<strong>Fatal congenital lactic acidosis in two siblings. II. Biochemical studies in vivo and vitro.</strong>
Acta Paediat. Scand. 60: 138-145, 1971.
[PubMed: 5548118]
[Full Text: https://doi.org/10.1111/j.1651-2227.1971.tb06633.x]
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Worsley, H. E., Brookfield, R. W., Elwood, J. S., Noble, R. L., Taylor, W. H.
<strong>Lactic acidosis with necrotizing encephalopathy in two sibs.</strong>
Arch. Dis. Child. 40: 492-501, 1965.
[PubMed: 5829993]
[Full Text: https://doi.org/10.1136/adc.40.213.492]
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Hilary J. Vernon - updated : 06/07/2021<br>Cassandra L. Kniffin - updated : 12/9/2010<br>Cassandra L. Kniffin - updated : 11/22/2010<br>Victor A. McKusick - updated : 8/16/2007
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Victor A. McKusick : 6/3/1986
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carol : 08/12/2024<br>carol : 05/16/2024<br>carol : 06/07/2021<br>carol : 05/18/2015<br>carol : 1/3/2011<br>carol : 12/21/2010<br>ckniffin : 12/20/2010<br>carol : 12/20/2010<br>ckniffin : 12/9/2010<br>ckniffin : 11/22/2010<br>terry : 5/20/2010<br>wwang : 5/28/2008<br>ckniffin : 5/22/2008<br>ckniffin : 5/22/2008<br>alopez : 8/21/2007<br>terry : 8/16/2007<br>terry : 4/20/2005<br>joanna : 3/18/2004<br>terry : 6/5/2001<br>terry : 5/7/1994<br>mimadm : 2/19/1994<br>supermim : 3/16/1992<br>carol : 8/7/1991<br>supermim : 3/20/1990<br>ddp : 10/26/1989
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Thank you in advance for your generous support, <br />
Ada Hamosh, MD, MPH <br />
Scientific Director, OMIM <br />
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