nih-gov/www.ncbi.nlm.nih.gov/omim/611818

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<title>
Entry
- #611818 - LONG QT SYNDROME 9; LQT9
- OMIM
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<span class="h4">#611818</span>
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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/611818"><strong>Clinical Synopsis</strong></a>
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<a href="/phenotypicSeries/PS192500"> <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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<li role="presentation" style="margin-left: 1em">
<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="#references"><strong>References</strong></a>
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<a href="#contributors"><strong>Contributors</strong></a>
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</div>
<div id="mimClinicalResourcesLinksFold" class="panel-collapse collapse in mimLinksFold" role="tabpanel" aria-labelledby="clinicalResources">
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<div><a href="https://clinicaltrials.gov/search?cond=(LONG QT SYNDROME) OR (CAV3)" class="mim-tip-hint" title="Clinical Trials" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Clinical Trials', 'domain': 'clinicaltrials.gov'})">Clinical Trials</a></div>
<div><a href="#mimEuroGentestFold" id="mimEuroGentestToggle" data-toggle="collapse" class="mim-tip-hint mimTriangleToggle" title="A list of European laboratories that offer genetic testing."><span id="mimEuroGentestToggleTriangle" class="small" style="margin-left: -0.8em;">&#9658;</span>EuroGentest</div>
<div id="mimEuroGentestFold" class="collapse">
<div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=14727&Typ=Pat" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">Romano-Ward syndrome&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=658&Typ=Pat" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">Familial long QT syndrome&nbsp;</a></div>
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<div><a href="https://www.ncbi.nlm.nih.gov/books/NBK1129/" class="mim-tip-hint" title="Expert-authored, peer-reviewed descriptions of inherited disorders including the uses of genetic testing in diagnosis, management, and genetic counseling." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Gene Reviews', 'domain': 'ncbi.nlm.nih.gov'})">Gene Reviews</a></div>
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<div><a href="https://www.ncbi.nlm.nih.gov/gtr/all/tests/?term=611818[mim]" class="mim-tip-hint" title="Genetic Testing Registry." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GTR', 'domain': 'ncbi.nlm.nih.gov'})">GTR</a></div>
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<div id="mimOrphanetFold" class="collapse">
<div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=101016" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">Romano-Ward syndrome</a></div><div style="margin-left: 0.5em;"><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=768" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">Familial long QT syndrome</a></div>
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&nbsp;
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<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> 101016, 768<br />
<strong>DO:</strong> 0110650<br />
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<span class="h3">
<span class="mim-font mim-tip-hint" title="Phenotype description, molecular basis known">
<span class="text-danger"><strong>#</strong></span>
611818
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<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
LONG QT SYNDROME 9; LQT9
</span>
</h3>
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<br />
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<a id="includedTitles" class="mim-anchor"></a>
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<span class="mim-font">
Other entities represented in this entry:
</span>
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<span class="h3 mim-font">
LONG QT SYNDROME 9, ACQUIRED, SUSCEPTIBILITY TO, INCLUDED
</span>
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<span class="h4 mim-font">
LONG QT SYNDROME 2/9, DIGENIC, INCLUDED; LQT2/9, DIGENIC, INCLUDED
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<br />
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<strong>Phenotype-Gene Relationships</strong>
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<table class="table table-bordered table-condensed table-hover small mim-table-padding">
<thead>
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<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/3/27?start=-3&limit=10&highlight=27">
3p25.3
</a>
</span>
</td>
<td>
<span class="mim-font">
Long QT syndrome 9
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611818"> 611818 </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">
CAV3
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601253"> 601253 </a>
</span>
</td>
</tr>
</tbody>
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<li><a href="/graph/linear/611818" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
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<span class="glyphicon glyphicon-question-sign mim-tip-hint" title="OMIM PheneGene graphics depict relationships between phenotypes, groups of related phenotypes (Phenotypic Series), and genes.<br /><a href='/static/omim/pdf/OMIM_Graphics.pdf' target='_blank'>A quick reference overview and guide (PDF)</a>"></span>
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</div>
<div id="mimClinicalSynopsisFold" class="well well-sm collapse mimSingletonToggleFold">
<div class="small" style="margin: 5px">
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<span class="h5 mim-font">
<strong> INHERITANCE </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Autosomal dominant <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/263681008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">263681008</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/771269000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">771269000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0443147&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0443147</a>, <a href="https://bioportal.bioontology.org/search?q=C1867440&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1867440</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> CARDIOVASCULAR </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<div>
<span class="h5 mim-font">
<em> Heart </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Prolongation of corrected QT interval <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4478837&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4478837</a>]</span><br /> -
Nonexertional syncope (in some patients) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4478838&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4478838</a>]</span><br /> -
Sinus bradycardia (in some patients) <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/49710005" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">49710005</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R00.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R00.1</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2108107&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2108107</a>, <a href="https://bioportal.bioontology.org/search?q=C5235162&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5235162</a>, <a href="https://bioportal.bioontology.org/search?q=C0085610&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0085610</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001688" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001688</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001688" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001688</a>]</span><br /> -
Cardiac arrest (in some patients) <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/397829000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">397829000</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/410429000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">410429000</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/I46" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">I46</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/427.5" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">427.5</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0018790&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0018790</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001695" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001695</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001695" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001695</a>]</span><br />
</span>
</div>
</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">
- Marked increase in late sodium current on voltage-clamp studies <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4478836&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4478836</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">
- Sudden unexplained infant death (SIDS) reported in some patients<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 caveolin 3 gene (CAV3, <a href="/entry/601253#0016">601253.0016</a>)<br />
</span>
</div>
</div>
</div>
<div class="text-right">
<a href="#mimClinicalSynopsisFold" data-toggle="collapse">&#9650;&nbsp;Close</a>
</div>
</div>
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<div class="small">
<div class="row">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
<h5>
Long QT syndrome
- <a href="/phenotypicSeries/PS192500">PS192500</a>
- 21 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/2/236?start=-3&limit=10&highlight=236"> 2p21 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616249"> Long QT syndrome 15 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616249"> 616249 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114182"> CALM2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114182"> 114182 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/3/27?start=-3&limit=10&highlight=27"> 3p25.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611818"> Long QT syndrome 9 </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/611818"> 611818 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601253"> CAV3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601253"> 601253 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/3/181?start=-3&limit=10&highlight=181"> 3p22.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603830"> Long QT syndrome 3 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603830"> 603830 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600163"> SCN5A </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600163"> 600163 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/4/502?start=-3&limit=10&highlight=502"> 4q25-q26 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600919"> Long QT syndrome 4 </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/600919"> 600919 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/106410"> ANK2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/106410"> 106410 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/4/502?start=-3&limit=10&highlight=502"> 4q25-q26 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600919"> Cardiac arrhythmia, ankyrin-B-related </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/600919"> 600919 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/106410"> ANK2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/106410"> 106410 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/7/404?start=-3&limit=10&highlight=404"> 7q21.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611820"> ?Long QT syndrome 11 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611820"> 611820 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604001"> AKAP9 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604001"> 604001 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/7/821?start=-3&limit=10&highlight=821"> 7q36.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613688"> Long QT syndrome 2 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613688"> 613688 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/152427"> KCNH2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/152427"> 152427 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/11/82?start=-3&limit=10&highlight=82"> 11p15.5-p15.4 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/192500"> {Long QT syndrome 1, acquired, susceptibility to} </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/192500"> 192500 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607542"> KCNQ1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607542"> 607542 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/11/82?start=-3&limit=10&highlight=82"> 11p15.5-p15.4 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/192500"> Long QT syndrome 1 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/192500"> 192500 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607542"> KCNQ1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607542"> 607542 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/11/976?start=-3&limit=10&highlight=976"> 11q23.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611819"> Atrial fibrillation, familial, 17 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611819"> 611819 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608256"> SCN4B </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608256"> 608256 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/11/976?start=-3&limit=10&highlight=976"> 11q23.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611819"> Long QT syndrome 10 </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/611819"> 611819 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608256"> SCN4B </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608256"> 608256 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/11/1085?start=-3&limit=10&highlight=1085"> 11q24.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613485"> Long QT syndrome 13 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613485"> 613485 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600734"> KCNJ5 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600734"> 600734 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/18?start=-3&limit=10&highlight=18"> 12p13.33 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618447"> Long QT syndrome 8 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618447"> 618447 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114205"> CACNA1C </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114205"> 114205 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/285?start=-3&limit=10&highlight=285"> 12q12 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613688"> {Long QT syndrome, acquired, reduced susceptibility to} </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/613688"> 613688 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603313"> ALG10B </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603313"> 603313 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/455?start=-3&limit=10&highlight=455"> 14q32.11 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616247"> Long QT syndrome 14 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616247"> 616247 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114180"> CALM1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114180"> 114180 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/17/893?start=-3&limit=10&highlight=893"> 17q24.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/170390"> Andersen syndrome </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/170390"> 170390 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600681"> KCNJ2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600681"> 600681 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/19/854?start=-3&limit=10&highlight=854"> 19q13.32 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618782"> ?Ventricular tachycardia, catecholaminergic polymorphic 6 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618782"> 618782 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114183"> CALM3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114183"> 114183 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/19/854?start=-3&limit=10&highlight=854"> 19q13.32 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618782"> Long QT syndrome 16 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618782"> 618782 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114183"> CALM3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114183"> 114183 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/20/213?start=-3&limit=10&highlight=213"> 20q11.21 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612955"> Long QT syndrome 12 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612955"> 612955 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601017"> SNTA1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601017"> 601017 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/21/79?start=-3&limit=10&highlight=79"> 21q22.11 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613693"> Long QT syndrome 6 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613693"> 613693 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603796"> KCNE2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603796"> 603796 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/21/80?start=-3&limit=10&highlight=80"> 21q22.12 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613695"> Long QT syndrome 5 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613695"> 613695 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/176261"> KCNE1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/176261"> 176261 </a>
</span>
</td>
</tr>
</tbody>
</table>
</div>
<div class="text-right small">
<a href="#mimPhenotypicSeriesFold" data-toggle="collapse">&#9650;&nbsp;Close</a>
</div>
</div>
</div>
</div>
<div>
<br />
</div>
<div>
<a id="text" class="mim-anchor"></a>
<h4 href="#mimTextFold" id="mimTextToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimTextToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<span class="mim-font">
<span class="mim-tip-floating" qtip_title="<strong>Looking For More References?</strong>" qtip_text="Click the 'reference plus' icon &lt;span class='glyphicon glyphicon-plus-sign'&gt;&lt;/span&gt at the end of each OMIM text paragraph to see more references related to the content of the preceding paragraph.">
<strong>TEXT</strong>
</span>
</span>
</h4>
<div id="mimTextFold" class="collapse in ">
<span class="mim-text-font">
<p>A number sign (#) is used with this entry because long QT syndrome-9 (LQT9) is caused by heterozygous mutation in the CAV3 gene (<a href="/entry/601253">601253</a>), which encodes caveolin-3, on chromosome 3p25.</p><p>Digenic inheritance has also been reported; see MOLECULAR GENETICS.</p>
</span>
<div>
<br />
</div>
</div>
<div>
<a id="description" class="mim-anchor"></a>
<h4 href="#mimDescriptionFold" id="mimDescriptionToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimDescriptionToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<span class="mim-font">
<strong>Description</strong>
</span>
</h4>
</div>
<div id="mimDescriptionFold" class="collapse in ">
<span class="mim-text-font">
<p>Congenital long QT syndrome is electrocardiographically characterized by a prolonged QT interval and polymorphic ventricular arrhythmias (torsade de pointes). These cardiac arrhythmias may result in recurrent syncope, seizure, or sudden death (<a href="#2" class="mim-tip-reference" title="Jongbloed, R. J. E., Wilde, A. A. M., Geelen, J. L. M. C., Doevendans, P., Schaap, C., Van Langen, I., van Tintelen, J. P., Cobben, J. M., Beaufort-Krol, G. C. M., Geraedts, J. P. M., Smeets, H. J. M. &lt;strong&gt;Novel KCNQ1 and HERG missense mutations in Dutch long-QT families.&lt;/strong&gt; Hum. Mutat. 13: 301-310, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10220144/&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;10220144&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/(SICI)1098-1004(1999)13:4&lt;301::AID-HUMU7&gt;3.0.CO;2-V&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="10220144">Jongbloed et al., 1999</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10220144" 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 long QT syndrome, see LQT1 (<a href="/entry/192500">192500</a>).</p>
</span>
<div>
<br />
</div>
</div>
<div>
<a id="clinicalFeatures" class="mim-anchor"></a>
<h4 href="#mimClinicalFeaturesFold" id="mimClinicalFeaturesToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimClinicalFeaturesToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
<span class="mim-font">
<strong>Clinical Features</strong>
</span>
</h4>
</div>
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<p><a href="#3" class="mim-tip-reference" title="Vatta, M., Ackerman, M. J., Ye, B., Makielski, J. C., Ughanze, E. E., Taylor, E. W., Tester, D. J., Balijepalli, R. C., Foell, J. D., Li, Z., Kamp, T. J., Towbin, J. A. &lt;strong&gt;Mutant caveolin-3 induces persistent late sodium current and is associated with long-QT syndrome.&lt;/strong&gt; Circulation 114: 2104-2112, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17060380/&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;17060380&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/CIRCULATIONAHA.106.635268&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="17060380">Vatta et al. (2006)</a> identified 6 patients with long QT syndrome and mutation in the CAV3 gene. Patient 1 was a 14-year-old girl who presented with nonexertional syncope with a QTc of 405 ms and U waves and sinus bradycardia on ECG. Her presentation was noted to be 'seizure-like'. This patient was found to carry a mutation in another long QT syndrome gene in addition to mutation in CAV3 (see MOLECULAR GENETICS). Patient 2 was an 8-year-old boy who presented with nonexertional syncope with a QTc of 433 ms and had marked sinus bradycardia. Patient 3 was a 40-year-old man who was asymptomatic with a QTc of 456 ms. Patient 4 was a 36-year-old woman who presented with cardiac arrest in sleep. Patient 5 was a 13-year-old girl with asthma who presented with shortness of breath and chest pain. Her QT prolongation (QTc 532 ms) was present only while on beta-agonist inhaler therapy for her asthma. Patient 6 was a 16-year-old boy who presented with nonexertional syncope and a QTc of 480 ms. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17060380" 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 heterozygous mutations in the CAV3 gene that were identified in patients 4, 5, and 6 with LQT9 by <a href="#3" class="mim-tip-reference" title="Vatta, M., Ackerman, M. J., Ye, B., Makielski, J. C., Ughanze, E. E., Taylor, E. W., Tester, D. J., Balijepalli, R. C., Foell, J. D., Li, Z., Kamp, T. J., Towbin, J. A. &lt;strong&gt;Mutant caveolin-3 induces persistent late sodium current and is associated with long-QT syndrome.&lt;/strong&gt; Circulation 114: 2104-2112, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17060380/&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;17060380&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/CIRCULATIONAHA.106.635268&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="17060380">Vatta et al. (2006)</a> occurred de novo. The families of probands 1, 2, and 3 declined genotyping. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17060380" 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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<strong>Molecular Genetics</strong>
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<p><a href="#3" class="mim-tip-reference" title="Vatta, M., Ackerman, M. J., Ye, B., Makielski, J. C., Ughanze, E. E., Taylor, E. W., Tester, D. J., Balijepalli, R. C., Foell, J. D., Li, Z., Kamp, T. J., Towbin, J. A. &lt;strong&gt;Mutant caveolin-3 induces persistent late sodium current and is associated with long-QT syndrome.&lt;/strong&gt; Circulation 114: 2104-2112, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17060380/&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;17060380&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/CIRCULATIONAHA.106.635268&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="17060380">Vatta et al. (2006)</a> analyzed the CAV3 gene (<a href="/entry/601253">601253</a>) in 905 unrelated patients with long QT syndrome who had previously been tested for mutations in known LQT genes; in 6 patients, they identified 4 heterozygous missense mutations (<a href="/entry/601253#0016">601253.0016</a>-<a href="/entry/601253#0019">601253.0019</a>, respectively) that were not found in more than 1,000 control alleles. Functional studies showed that the mutant caveolin-3 resulted in a 2- to 3-fold increase in the late sodium current of the cardiac sodium channel compared with wildtype. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17060380" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#1" class="mim-tip-reference" title="Cronk, L. B., Ye, B., Kaku, T., Tester, D. J., Vatta, M., Makielski, J. C., Ackerman, M. J. &lt;strong&gt;Novel mechanism for sudden infant death syndrome: persistent late sodium current secondary to mutations in caveolin-3.&lt;/strong&gt; Heart Rhythm 4: 161-166, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17275750/&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;17275750&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17275750[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/10.1016/j.hrthm.2006.11.030&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="17275750">Cronk et al. (2007)</a> analyzed the CAV3 gene in necropsy tissue from 134 unrelated cases of sudden infant death syndrome (SIDS; <a href="/entry/272120">272120</a>) and identified 3 missense mutations in 3 of 50 black infants (<a href="/entry/601253#0018">601253.0018</a>; <a href="/entry/601253#0020">601253.0020</a>; <a href="/entry/601253#0021">601253.0021</a>). No mutations were detected in 1 Hispanic or 83 Caucasian infants. Voltage clamp studies demonstrated a gain-of-function phenotype for all 3 CAV3 mutations, with a 5-fold increase in late sodium current compared to controls. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17275750" 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>Digenic Inheritance</em></strong></p><p>
<a href="#3" class="mim-tip-reference" title="Vatta, M., Ackerman, M. J., Ye, B., Makielski, J. C., Ughanze, E. E., Taylor, E. W., Tester, D. J., Balijepalli, R. C., Foell, J. D., Li, Z., Kamp, T. J., Towbin, J. A. &lt;strong&gt;Mutant caveolin-3 induces persistent late sodium current and is associated with long-QT syndrome.&lt;/strong&gt; Circulation 114: 2104-2112, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17060380/&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;17060380&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/CIRCULATIONAHA.106.635268&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="17060380">Vatta et al. (2006)</a> identified a long QT syndrome patient who had biallelic digenic mutations: a 14-year-old girl with nonexertional syncope and a 'seizure-like' presentation, who had U waves, sinus bradycardia, and a QTc of 405 ms on ECG, was found to carry a missense mutation in the LQT2-associated KCNH2 gene as well as a mutation in the CAV3 gene (see <a href="/entry/601253#0018">601253.0018</a> and <a href="/entry/152427#0024">152427.0024</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17060380" 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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<strong>REFERENCES</strong>
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<a id="1" class="mim-anchor"></a>
<a id="Cronk2007" class="mim-anchor"></a>
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Cronk, L. B., Ye, B., Kaku, T., Tester, D. J., Vatta, M., Makielski, J. C., Ackerman, M. J.
<strong>Novel mechanism for sudden infant death syndrome: persistent late sodium current secondary to mutations in caveolin-3.</strong>
Heart Rhythm 4: 161-166, 2007.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17275750/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17275750</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=17275750[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=17275750" 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.hrthm.2006.11.030" target="_blank">Full Text</a>]
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<a id="Jongbloed1999" class="mim-anchor"></a>
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Jongbloed, R. J. E., Wilde, A. A. M., Geelen, J. L. M. C., Doevendans, P., Schaap, C., Van Langen, I., van Tintelen, J. P., Cobben, J. M., Beaufort-Krol, G. C. M., Geraedts, J. P. M., Smeets, H. J. M.
<strong>Novel KCNQ1 and HERG missense mutations in Dutch long-QT families.</strong>
Hum. Mutat. 13: 301-310, 1999.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10220144/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10220144</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10220144" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1002/(SICI)1098-1004(1999)13:4&lt;301::AID-HUMU7&gt;3.0.CO;2-V" target="_blank">Full Text</a>]
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<a id="Vatta2006" class="mim-anchor"></a>
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Vatta, M., Ackerman, M. J., Ye, B., Makielski, J. C., Ughanze, E. E., Taylor, E. W., Tester, D. J., Balijepalli, R. C., Foell, J. D., Li, Z., Kamp, T. J., Towbin, J. A.
<strong>Mutant caveolin-3 induces persistent late sodium current and is associated with long-QT syndrome.</strong>
Circulation 114: 2104-2112, 2006.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17060380/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17060380</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17060380" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1161/CIRCULATIONAHA.106.635268" target="_blank">Full Text</a>]
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Anne M. Stumpf - updated : 09/12/2024
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Marla J. F. O&#x27;Neill : 2/25/2008
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alopez : 09/12/2024
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joanna : 04/01/2022<br>carol : 04/23/2017<br>carol : 09/18/2015<br>alopez : 6/12/2014<br>alopez : 2/3/2012<br>carol : 1/14/2011<br>carol : 1/12/2011<br>carol : 3/18/2008<br>wwang : 2/26/2008
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<strong>#</strong> 611818
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LONG QT SYNDROME 9; LQT9
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Other entities represented in this entry:
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LONG QT SYNDROME 9, ACQUIRED, SUSCEPTIBILITY TO, INCLUDED
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LONG QT SYNDROME 2/9, DIGENIC, INCLUDED; LQT2/9, DIGENIC, INCLUDED
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<strong>ORPHA:</strong> 101016, 768; &nbsp;
<strong>DO:</strong> 0110650; &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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3p25.3
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Long QT syndrome 9
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611818
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Autosomal dominant
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3
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CAV3
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601253
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<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because long QT syndrome-9 (LQT9) is caused by heterozygous mutation in the CAV3 gene (601253), which encodes caveolin-3, on chromosome 3p25.</p><p>Digenic inheritance has also been reported; see MOLECULAR GENETICS.</p>
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<strong>Description</strong>
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<p>Congenital long QT syndrome is electrocardiographically characterized by a prolonged QT interval and polymorphic ventricular arrhythmias (torsade de pointes). These cardiac arrhythmias may result in recurrent syncope, seizure, or sudden death (Jongbloed et al., 1999). </p><p>For a discussion of genetic heterogeneity of long QT syndrome, see LQT1 (192500).</p>
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<strong>Clinical Features</strong>
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<p>Vatta et al. (2006) identified 6 patients with long QT syndrome and mutation in the CAV3 gene. Patient 1 was a 14-year-old girl who presented with nonexertional syncope with a QTc of 405 ms and U waves and sinus bradycardia on ECG. Her presentation was noted to be 'seizure-like'. This patient was found to carry a mutation in another long QT syndrome gene in addition to mutation in CAV3 (see MOLECULAR GENETICS). Patient 2 was an 8-year-old boy who presented with nonexertional syncope with a QTc of 433 ms and had marked sinus bradycardia. Patient 3 was a 40-year-old man who was asymptomatic with a QTc of 456 ms. Patient 4 was a 36-year-old woman who presented with cardiac arrest in sleep. Patient 5 was a 13-year-old girl with asthma who presented with shortness of breath and chest pain. Her QT prolongation (QTc 532 ms) was present only while on beta-agonist inhaler therapy for her asthma. Patient 6 was a 16-year-old boy who presented with nonexertional syncope and a QTc of 480 ms. </p>
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<strong>Inheritance</strong>
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<p>The heterozygous mutations in the CAV3 gene that were identified in patients 4, 5, and 6 with LQT9 by Vatta et al. (2006) occurred de novo. The families of probands 1, 2, and 3 declined genotyping. </p>
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<strong>Molecular Genetics</strong>
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<p>Vatta et al. (2006) analyzed the CAV3 gene (601253) in 905 unrelated patients with long QT syndrome who had previously been tested for mutations in known LQT genes; in 6 patients, they identified 4 heterozygous missense mutations (601253.0016-601253.0019, respectively) that were not found in more than 1,000 control alleles. Functional studies showed that the mutant caveolin-3 resulted in a 2- to 3-fold increase in the late sodium current of the cardiac sodium channel compared with wildtype. </p><p>Cronk et al. (2007) analyzed the CAV3 gene in necropsy tissue from 134 unrelated cases of sudden infant death syndrome (SIDS; 272120) and identified 3 missense mutations in 3 of 50 black infants (601253.0018; 601253.0020; 601253.0021). No mutations were detected in 1 Hispanic or 83 Caucasian infants. Voltage clamp studies demonstrated a gain-of-function phenotype for all 3 CAV3 mutations, with a 5-fold increase in late sodium current compared to controls. </p><p><strong><em>Digenic Inheritance</em></strong></p><p>
Vatta et al. (2006) identified a long QT syndrome patient who had biallelic digenic mutations: a 14-year-old girl with nonexertional syncope and a 'seizure-like' presentation, who had U waves, sinus bradycardia, and a QTc of 405 ms on ECG, was found to carry a missense mutation in the LQT2-associated KCNH2 gene as well as a mutation in the CAV3 gene (see 601253.0018 and 152427.0024). </p>
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<strong>REFERENCES</strong>
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Cronk, L. B., Ye, B., Kaku, T., Tester, D. J., Vatta, M., Makielski, J. C., Ackerman, M. J.
<strong>Novel mechanism for sudden infant death syndrome: persistent late sodium current secondary to mutations in caveolin-3.</strong>
Heart Rhythm 4: 161-166, 2007.
[PubMed: 17275750]
[Full Text: https://doi.org/10.1016/j.hrthm.2006.11.030]
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Jongbloed, R. J. E., Wilde, A. A. M., Geelen, J. L. M. C., Doevendans, P., Schaap, C., Van Langen, I., van Tintelen, J. P., Cobben, J. M., Beaufort-Krol, G. C. M., Geraedts, J. P. M., Smeets, H. J. M.
<strong>Novel KCNQ1 and HERG missense mutations in Dutch long-QT families.</strong>
Hum. Mutat. 13: 301-310, 1999.
[PubMed: 10220144]
[Full Text: https://doi.org/10.1002/(SICI)1098-1004(1999)13:4&lt;301::AID-HUMU7&gt;3.0.CO;2-V]
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Vatta, M., Ackerman, M. J., Ye, B., Makielski, J. C., Ughanze, E. E., Taylor, E. W., Tester, D. J., Balijepalli, R. C., Foell, J. D., Li, Z., Kamp, T. J., Towbin, J. A.
<strong>Mutant caveolin-3 induces persistent late sodium current and is associated with long-QT syndrome.</strong>
Circulation 114: 2104-2112, 2006.
[PubMed: 17060380]
[Full Text: https://doi.org/10.1161/CIRCULATIONAHA.106.635268]
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