nih-gov/www.ncbi.nlm.nih.gov/omim/604559

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Entry
- #604559 - PROGRESSIVE FAMILIAL HEART BLOCK, TYPE IB; PFHB1B
- OMIM
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<span class="h4">#604559</span>
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<a href="#phenotypeMap"><strong>Phenotype-Gene Relationships</strong></a>
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<a href="/clinicalSynopsis/604559"><strong>Clinical Synopsis</strong></a>
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<a href="/phenotypicSeries/PS113900"> <strong>Phenotypic Series</strong> </a>
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<a href="#text"><strong>Text</strong></a>
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<a href="#clinicalFeatures">Clinical Features</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 id="mimClinicalResourcesLinksFold" class="panel-collapse collapse in mimLinksFold" role="tabpanel" aria-labelledby="clinicalResources">
<div class="panel-body small mim-panel-body">
<div><a href="https://clinicaltrials.gov/search?cond=(PROGRESSIVE FAMILIAL HEART BLOCK, TYPE IB) OR (TRPM4)" 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="https://www.orpha.net/consor/cgi-bin/ClinicalLabs_Search_Simple.php?lng=EN&LnkId=965&Typ=Pat" class="mim-tip-hint" title="A list of European laboratories that offer genetic testing." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'EuroGentest', 'domain': 'orpha.net'})">EuroGentest</a></div>
<div><a href="https://www.diseaseinfosearch.org/x/5979" class="mim-tip-hint" title="Network of disease-specific advocacy organizations, universities, private companies, government agencies, and public policy organizations." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Genetic Alliance', 'domain': 'diseaseinfosearch.org'})">Genetic Alliance</a></div>
<div><a href="https://medlineplus.gov/genetics/condition/progressive-familial-heart-block" class="mim-tip-hint" title="Consumer-friendly information about the effects of genetic variation on human health." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MedlinePlus Genetics', 'domain': 'medlineplus.gov'})">MedlinePlus Genetics</a></div>
<div><a href="https://www.ncbi.nlm.nih.gov/gtr/all/tests/?term=604559[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>
<div><a href="https://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=871" class="mim-tip-hint" title="European reference portal for information on rare diseases and orphan drugs." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'OrphaNet', 'domain': 'orpha.net'})">OrphaNet</a></div>
</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="mimAnimalModels">
<span class="panel-title">
<span class="small">
<a href="#mimAnimalModelsLinksFold" id="mimAnimalModelsLinksToggle" class="collapsed mimSingletonTriangleToggle" role="button" data-toggle="collapse" data-parent="#mimExternalLinksAccordion">
<div style="display: table-row">
<div id="mimAnimalModelsLinksToggleTriangle" class="small mimSingletonTriangle" style="color: #337CB5; display: table-cell;">&#9658;</div>
&nbsp;
<div style="display: table-cell;">Animal Models</div>
</div>
</a>
</span>
</span>
</div>
<div id="mimAnimalModelsLinksFold" class="panel-collapse collapse mimLinksFold" role="tabpanel">
<div class="panel-body small mim-panel-body">
<div><a href="https://www.alliancegenome.org/disease/DOID:0111076" class="mim-tip-hint" title="Search Across Species; explore model organism and human comparative genomics." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Alliance Genome', 'domain': 'alliancegenome.org'})">Alliance Genome</a></div>
<div><a href="http://www.informatics.jax.org/disease/604559" 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>
</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>SNOMEDCT:</strong> 698250005<br />
<strong>ORPHA:</strong> 871<br />
<strong>DO:</strong> 0111076<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>
604559
</span>
</span>
</div>
</div>
<div>
<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
PROGRESSIVE FAMILIAL HEART BLOCK, TYPE IB; PFHB1B
</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">
PFHBIB
</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/19/936?start=-3&limit=10&highlight=936">
19q13.33
</a>
</span>
</td>
<td>
<span class="mim-font">
Progressive familial heart block, type IB
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604559"> 604559 </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">
TRPM4
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606936"> 606936 </a>
</span>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div>
<div class="btn-group ">
<a href="/clinicalSynopsis/604559" 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/PS113900" 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')">
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<span class="sr-only">Toggle Dropdown</span>
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&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/604559" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
<li><a href="/graph/radial/604559" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Radial'})"> Radial </a></li>
</ul>
</div>
<span class="glyphicon glyphicon-question-sign mim-tip-hint" title="OMIM PheneGene graphics depict relationships between phenotypes, groups of related phenotypes (Phenotypic Series), and genes.<br /><a href='/static/omim/pdf/OMIM_Graphics.pdf' target='_blank'>A quick reference overview and guide (PDF)</a>"></span>
<div>
<p />
</div>
<div id="mimClinicalSynopsisFold" class="well well-sm collapse mimSingletonToggleFold">
<div class="small" style="margin: 5px">
<div>
<div>
<span class="h5 mim-font">
<strong> INHERITANCE </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Autosomal dominant <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/263681008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">263681008</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/771269000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">771269000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0443147&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0443147</a>, <a href="https://bioportal.bioontology.org/search?q=C1867440&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1867440</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> 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">
- Cardiac conduction defects <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/44808001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">44808001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/I45.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">I45.9</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/426.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">426.9</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/426" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">426</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4318382&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4318382</a>, <a href="https://bioportal.bioontology.org/search?q=C1842820&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1842820</a>, <a href="https://bioportal.bioontology.org/search?q=C0264886&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0264886</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0031546" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0031546</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0031546" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0031546</a>]</span><br /> -
Bradycardia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/48867003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">48867003</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=C0428977&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0428977</a>, <a href="https://bioportal.bioontology.org/search?q=C3812171&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3812171</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001662" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001662</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001662" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001662</a>]</span><br /> -
Syncope <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/272030005" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">272030005</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/271594007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">271594007</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/309585006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">309585006</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R55" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R55</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/780.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">780.2</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3541349&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3541349</a>, <a href="https://bioportal.bioontology.org/search?q=C0039070&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0039070</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001279" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001279</a>, <a href="https://hpo.jax.org/app/browse/term/HP:0007185" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0007185</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001279" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001279</a>]</span><br /> -
Left axis deviation <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/39732003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">39732003</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0232297&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0232297</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0033568" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0033568</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0033568" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0033568</a>]</span><br /> -
Right axis deviation <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/47665007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">47665007</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0232296&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0232296</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0033567" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0033567</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0033567" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0033567</a>]</span><br /> -
Right bundle branch block, incomplete or complete <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C3551671&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C3551671</a>]</span><br /> -
Left anterior hemiblock <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/37760005" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">37760005</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/I44.4" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">I44.4</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2215995&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2215995</a>, <a href="https://bioportal.bioontology.org/search?q=C0264912&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0264912</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0011711" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0011711</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0011711" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0011711</a>]</span><br /> -
Bifascicular block <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/74021003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">74021003</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/I45.2" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">I45.2</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0264914&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0264914</a>]</span><br /> -
Atrioventricular block, incomplete or complete <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0866753&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0866753</a>]</span><br /> -
Prolonged QT interval <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/111975006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">111975006</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0151878&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0151878</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001657" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001657</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001657" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001657</a>]</span><br /> -
Short PR interval <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/49578007" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">49578007</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0520878&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0520878</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0005165" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0005165</a>]</span><br />
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<span class="h5 mim-font">
<strong> MISCELLANEOUS </strong>
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<span class="mim-font">
- Patients often require implantation of a pacemaker<br /> -
Conduction defect is progressive<br />
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<span class="h5 mim-font">
<strong> MOLECULAR BASIS </strong>
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<span class="mim-font">
- Caused by mutation in the transient receptor potential cation channel, subfamily M, member 4 gene (TRPM4, <a href="/entry/606936#0001">606936.0001</a>)<br />
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<h5>
Progressive familial heart block
- <a href="/phenotypicSeries/PS113900">PS113900</a>
- 4 Entries
</h5>
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<strong>Location</strong>
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<strong>Phenotype</strong>
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<strong>Inheritance</strong>
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<strong>Phenotype<br />mapping key</strong>
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<strong>Phenotype<br />MIM number</strong>
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<strong>Gene/Locus</strong>
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<strong>Gene/Locus<br />MIM number</strong>
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<td>
<span class="mim-font">
<a href="/geneMap/1/1547?start=-3&limit=10&highlight=1547"> 1q32 </a>
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<td>
<span class="mim-font">
<a href="/entry/140400"> Progressive familial heart block, type II </a>
</span>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
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<span class="mim-font">
<a href="/entry/140400"> 140400 </a>
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<td>
<span class="mim-font">
<a href="/entry/140400"> PFHB2 </a>
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</td>
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<span class="mim-font">
<a href="/entry/140400"> 140400 </a>
</span>
</td>
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<span class="mim-font">
<a href="/geneMap/3/181?start=-3&limit=10&highlight=181"> 3p22.2 </a>
</span>
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<td>
<span class="mim-font">
<a href="/entry/113900"> Heart block, progressive, type IA </a>
</span>
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<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>
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<span class="mim-font">
<a href="/entry/113900"> 113900 </a>
</span>
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<span class="mim-font">
<a href="/entry/600163"> SCN5A </a>
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<span class="mim-font">
<a href="/entry/600163"> 600163 </a>
</span>
</td>
</tr>
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<td>
<span class="mim-font">
<a href="/geneMap/3/181?start=-3&limit=10&highlight=181"> 3p22.2 </a>
</span>
</td>
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<span class="mim-font">
<a href="/entry/113900"> Heart block, nonprogressive </a>
</span>
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<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/113900"> 113900 </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/19/936?start=-3&limit=10&highlight=936"> 19q13.33 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604559"> Progressive familial heart block, type IB </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/604559"> 604559 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606936"> TRPM4 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606936"> 606936 </a>
</span>
</td>
</tr>
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</table>
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<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>
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<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>
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</h4>
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<p>A number sign (#) is used with this entry because of evidence that progressive familial heart block type IB (PFHB1B) is caused by heterozygous mutation in the TRPM4 gene (<a href="/entry/606936">606936</a>) on chromosome 19q13.</p><p>For a phenotypic description and a discussion of genetic heterogeneity of progressive familial heart block type I, see PFHB1A (<a href="/entry/113900">113900</a>).</p>
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<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>
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<strong>Clinical Features</strong>
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<p><a href="#2" class="mim-tip-reference" title="Brink, A. J., Torrington, M. &lt;strong&gt;Progressive familial heart block--two types.&lt;/strong&gt; S. Afr. Med. J. 52: 53-59, 1977.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/897853/&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;897853&lt;/a&gt;]" pmid="897853">Brink and Torrington (1977)</a> reported a 6-generation South African family of Portuguese and French ancestry with 261 known relatives, in which conduction defects segregated in an autosomal dominant pattern. Of 55 members in the last 3 generations who underwent electrocardiography, 31 had conduction abnormalities, including 16 with monofascicular right bundle branch block (RBBB), 3 with left anterior hemiblock, and 6 with complete heart block; another 6 individuals had a mildly prolonged QT interval or short PR interval without a Wolff-Parkinson-White (<a href="/entry/194200">194200</a>) pattern. The average age at which a pacemaker was implanted in the 3 successive generations decreased from 54.5 years in the fourth to 25 years in the fifth to 1 year of age in the sixth generation. Sudden cardiac death occurred in 22 individuals over the 3 generations, also at increasingly younger ages, dropping from an average of 50.7 years to 44.7 years to 12.3 years in the fourth, fifth, and sixth generations, respectively. <a href="#13" class="mim-tip-reference" title="van der Merwe, P.-L., Weymar, H. W., Torrington, M., Brink, A. J. &lt;strong&gt;Progressive familial heart block. Part II. Clinical and ECG confirmation of progression: report on 4 cases.&lt;/strong&gt; S. Afr. Med. J. 70: 356-357, 1986.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/3750143/&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;3750143&lt;/a&gt;]" pmid="3750143">Van der Merwe et al. (1986)</a> and <a href="#12" class="mim-tip-reference" title="van der Merwe, P.-L., Weymar, H. W., Torrington, M., Brink, A. J. &lt;strong&gt;Progressive familial heart block (type I): a follow-up study after 10 years.&lt;/strong&gt; S. Afr. Med. J. 73: 275-276, 1988.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/3347879/&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;3347879&lt;/a&gt;]" pmid="3347879">van der Merwe et al. (1988)</a> provided follow-up information on the kindred reported by <a href="#2" class="mim-tip-reference" title="Brink, A. J., Torrington, M. &lt;strong&gt;Progressive familial heart block--two types.&lt;/strong&gt; S. Afr. Med. J. 52: 53-59, 1977.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/897853/&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;897853&lt;/a&gt;]" pmid="897853">Brink and Torrington (1977)</a> and documented the progressive nature of the disorder. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=897853+3750143+3347879" 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="Stephan, E. &lt;strong&gt;Hereditary bundle branch system defect: survey of a family with four affected generations.&lt;/strong&gt; Am. Heart J. 95: 89-95, 1978.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/619595/&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;619595&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0002-8703(78)90401-5&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="619595">Stephan (1978)</a> studied a Lebanese kindred with over 265 living descendants of a polygamous progenitor who was known to have had a slow pulse and syncope. Many examples of conduction defects, mainly right bundle branch block, left anterior hemiblock, bifascicular block and atrioventricular (AV) block, were found in his descendants. The abnormality was thought to be congenital, with a pedigree pattern consistent with autosomal dominant inheritance. However, 1 person presented with complete heart block at age 41. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=619595" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#11" class="mim-tip-reference" title="Stephan, E., de Meeus, A., Bouvagnet, P. &lt;strong&gt;Hereditary bundle branch defect: right bundle branch blocks of different causes have different morphologic characteristics.&lt;/strong&gt; Am. Heart J. 133: 249-256, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9023172/&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;9023172&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/s0002-8703(97)70215-1&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="9023172">Stephan et al. (1997)</a> provided follow-up on the Lebanese kindred reported by <a href="#9" class="mim-tip-reference" title="Stephan, E. &lt;strong&gt;Hereditary bundle branch system defect: survey of a family with four affected generations.&lt;/strong&gt; Am. Heart J. 95: 89-95, 1978.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/619595/&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;619595&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0002-8703(78)90401-5&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="619595">Stephan (1978)</a>. They considered the most appropriate designation for this disorder to be 'hereditary bundle branch defect' (HBBD). <a href="#10" class="mim-tip-reference" title="Stephan, E., Aftimos, G., Allam, C. &lt;strong&gt;Familial fascicular block: histologic features of Lev&#x27;s disease.&lt;/strong&gt; Am. Heart J. 109: 1399-1401, 1985.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/4003252/&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;4003252&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0002-8703(85)90377-1&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="4003252">Stephan et al. (1985)</a> reported an autopsied case. There were over 400 descendants of the progenitor in 5 generations. <a href="#11" class="mim-tip-reference" title="Stephan, E., de Meeus, A., Bouvagnet, P. &lt;strong&gt;Hereditary bundle branch defect: right bundle branch blocks of different causes have different morphologic characteristics.&lt;/strong&gt; Am. Heart J. 133: 249-256, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9023172/&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;9023172&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/s0002-8703(97)70215-1&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="9023172">Stephan et al. (1997)</a> studied the evolution of the disorder in this kindred over a 2-decade period, described a variety of electrocardiographic abnormalities encountered in the family, and reassessed penetrance. A total of 396 persons had at least one clinical examination and electrocardiogram, of whom 47 were judged affected and 36 'indeterminate.' The conduction block may be overt in the first year of life, and among affected individuals there was a worsening of the conduction block in 5 to 15% of cases, leading to complete atrioventricular block and possibly to sudden death. A group of individuals had QRS anomalies in right precordial leads, possibly indicating partial right bundle branch block. A high proportion of these were identified as mutation carriers (the disorder in this family was shown to map to 19q) and about one-fifth of these patients evolved toward a complete fascicular block. By contrast, mutation carriers with a normal electrocardiogram remained normal. Mutation carriers demonstrated a conduction block significantly more often in males than females (75% and 50%, respectively). Brink et al. (<a href="#4" class="mim-tip-reference" title="Brink, P. A., Moolman, J. C., Ferreira, A., de Jager, T., Weymar, H. W., Martell, R. W., Torrington, M., van der Merwe, P. L., Corfield, V. A. &lt;strong&gt;Genetic linkage studies of progressive familial heart block, a cardiac conduction disorder.&lt;/strong&gt; S. Afr. J. Med. Sci. 90: 236-240, 1994."None>1994</a>, <a href="#3" class="mim-tip-reference" title="Brink, P. A., Ferreira, A., Moolman, J. C., Weymar, H. W., van der Merwe, P.-L., Corfield, V. A. &lt;strong&gt;Gene for progressive familial heart block type I maps to chromosome 19q13.&lt;/strong&gt; Circulation 91: 1633-1640, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7882468/&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;7882468&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/01.cir.91.6.1633&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="7882468">1995</a>) had found almost 100% penetrance in their South African family. <a href="#11" class="mim-tip-reference" title="Stephan, E., de Meeus, A., Bouvagnet, P. &lt;strong&gt;Hereditary bundle branch defect: right bundle branch blocks of different causes have different morphologic characteristics.&lt;/strong&gt; Am. Heart J. 133: 249-256, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9023172/&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;9023172&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/s0002-8703(97)70215-1&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="9023172">Stephan et al. (1997)</a> presented a table of penetrance values estimated from 9 other families as well as their own. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7882468+9023172+619595+4003252" 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="#7" class="mim-tip-reference" title="Liu, H., El Zein, L., Kruse, M., Guinamard, R., Beckmann, A., Bozio, A., Kurtbay, G., Megarbane, A., Ohmert, I., Blaysat, G., Villain, E., Pongs, O., Bouvagnet, P. &lt;strong&gt;Gain-of-function mutations in TRPM4 cause autosomal dominant isolated cardiac conduction disease.&lt;/strong&gt; Circ. Cardiovasc. Genet. 3: 374-385, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20562447/&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;20562447&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/CIRCGENETICS.109.930867&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="20562447">Liu et al. (2010)</a> studied the large Lebanese kindred with autosomal dominant isolated cardiac conduction block, originally reported by <a href="#9" class="mim-tip-reference" title="Stephan, E. &lt;strong&gt;Hereditary bundle branch system defect: survey of a family with four affected generations.&lt;/strong&gt; Am. Heart J. 95: 89-95, 1978.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/619595/&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;619595&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0002-8703(78)90401-5&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="619595">Stephan (1978)</a>, as well as 2 French families with a variety of cardiac conduction blocks segregating in an autosomal dominant fashion. Altogether, there were 2 cases of isolated left axis deviation (LAD), 10 cases of complete right bundle branch block, 16 cases of incomplete RBBB, 15 cases of complete RBBB with LAD, 6 cases of complete RBBB with right axis deviation (RAD), and 7 cases of complete atrioventricular conduction block. <a href="#7" class="mim-tip-reference" title="Liu, H., El Zein, L., Kruse, M., Guinamard, R., Beckmann, A., Bozio, A., Kurtbay, G., Megarbane, A., Ohmert, I., Blaysat, G., Villain, E., Pongs, O., Bouvagnet, P. &lt;strong&gt;Gain-of-function mutations in TRPM4 cause autosomal dominant isolated cardiac conduction disease.&lt;/strong&gt; Circ. Cardiovasc. Genet. 3: 374-385, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20562447/&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;20562447&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/CIRCGENETICS.109.930867&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="20562447">Liu et al. (2010)</a> observed 2 remarkable features in the 3 families: no family member had left bundle branch block (LBBB), complete or incomplete, and no other cardiac anomalies were found on repeated cardiac investigations, including echocardiogram, stress test, ambulatory electrocardiogram, and heart scintigraphy. The authors concluded that the 3 families shared an autosomal dominant disease resulting in any conduction block but LBBB, and no other cardiac anomalies. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=619595+20562447" 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="mapping" class="mim-anchor"></a>
<h4 href="#mimMappingFold" id="mimMappingToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimMappingToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
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<strong>Mapping</strong>
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<p><a href="#3" class="mim-tip-reference" title="Brink, P. A., Ferreira, A., Moolman, J. C., Weymar, H. W., van der Merwe, P.-L., Corfield, V. A. &lt;strong&gt;Gene for progressive familial heart block type I maps to chromosome 19q13.&lt;/strong&gt; Circulation 91: 1633-1640, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7882468/&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;7882468&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/01.cir.91.6.1633&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="7882468">Brink et al. (1995)</a> analyzed the large South African kindred reported by <a href="#2" class="mim-tip-reference" title="Brink, A. J., Torrington, M. &lt;strong&gt;Progressive familial heart block--two types.&lt;/strong&gt; S. Afr. Med. J. 52: 53-59, 1977.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/897853/&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;897853&lt;/a&gt;]" pmid="897853">Brink and Torrington (1977)</a> and demonstrated linkage to 19q13.2-q13.3. They pointed out that this kindred descended from an ancestor who emigrated from Portugal in 1696. It had been estimated that there may be between 1,000 and 9,000 gene carriers among his descendants. Maximum 2-point lod scores were 6.49 at theta = 0.0 for kallikrein (KLK1; <a href="/entry/147910">147910</a>), 5.72 at theta = 0.01 for the myotonic dystrophy locus (DM; <a href="/entry/160900">160900</a>), 3.44 at theta = 0.0 for the creatine kinase muscle-type locus (CKM; <a href="/entry/123310">123310</a>), and 4.51 at theta = 0.10 for the apolipoprotein C2 locus (APOC2; <a href="/entry/608083">608083</a>). <a href="#3" class="mim-tip-reference" title="Brink, P. A., Ferreira, A., Moolman, J. C., Weymar, H. W., van der Merwe, P.-L., Corfield, V. A. &lt;strong&gt;Gene for progressive familial heart block type I maps to chromosome 19q13.&lt;/strong&gt; Circulation 91: 1633-1640, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7882468/&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;7882468&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/01.cir.91.6.1633&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="7882468">Brink et al. (1995)</a> noted that the gene for myotonin protein kinase, which is implicated as a cause of myotonic dystrophy, lies within this region and that myotonic dystrophy is a disease complicated by heart block and other conduction abnormalities; however, a recombination event ruled out the myotonic dystrophy locus from direct involvement with PFHB1B. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7882468+897853" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Using a genomewide screening approach with polymorphic (CA)n repeat markers in the Lebanese family originally described by <a href="#9" class="mim-tip-reference" title="Stephan, E. &lt;strong&gt;Hereditary bundle branch system defect: survey of a family with four affected generations.&lt;/strong&gt; Am. Heart J. 95: 89-95, 1978.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/619595/&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;619595&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0002-8703(78)90401-5&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="619595">Stephan (1978)</a>, <a href="#5" class="mim-tip-reference" title="de Meeus, A., Stephan, E., Debrus, S., Jean, M.-K., Loiselet, J., Weissenbach, J., Demaille, J., Bouvagnet, P. &lt;strong&gt;An isolated cardiac conduction disease maps to chromosome 19q.&lt;/strong&gt; Circ. Res. 77: 735-740, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7554120/&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;7554120&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/01.res.77.4.735&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="7554120">de Meeus et al. (1995)</a> obtained a maximum multipoint lod score of 7.18 at D19S604 on chromosome 19q13.3. Flanking loci D19S606 and D19S571 were excluded due to a recombination event in 3 affected individuals, narrowing the critical region to a 13-cM interval. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=619595+7554120" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Using additional microsatellite markers in the Afrikaner kindred with progressive heart block originally reported by <a href="#2" class="mim-tip-reference" title="Brink, A. J., Torrington, M. &lt;strong&gt;Progressive familial heart block--two types.&lt;/strong&gt; S. Afr. Med. J. 52: 53-59, 1977.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/897853/&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;897853&lt;/a&gt;]" pmid="897853">Brink and Torrington (1977)</a>, <a href="#6" class="mim-tip-reference" title="Kruse, M., Schulze-Bahr, E., Corfield, V., Beckmann, A., Stallmeyer, B., Kurtbay, G., Ohmert, I., Schulze-Bahr, E., Brink, P., Pongs, O. &lt;strong&gt;Impaired endocytosis of the ion channel TRPM4 is associated with human progressive familial heart block type I.&lt;/strong&gt; J. Clin. Invest. 119: 2737-2744, 2009.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/19726882/&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;19726882&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=19726882[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/10.1172/JCI38292&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="19726882">Kruse et al. (2009)</a> narrowed the PFHB1B locus to a 0.5-Mb interval between markers D19S1059 and D19S604 on chromosome 19q13.33 containing approximately 25 genes. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=897853+19726882" 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="#7" class="mim-tip-reference" title="Liu, H., El Zein, L., Kruse, M., Guinamard, R., Beckmann, A., Bozio, A., Kurtbay, G., Megarbane, A., Ohmert, I., Blaysat, G., Villain, E., Pongs, O., Bouvagnet, P. &lt;strong&gt;Gain-of-function mutations in TRPM4 cause autosomal dominant isolated cardiac conduction disease.&lt;/strong&gt; Circ. Cardiovasc. Genet. 3: 374-385, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20562447/&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;20562447&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/CIRCGENETICS.109.930867&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="20562447">Liu et al. (2010)</a> analyzed polymorphic markers on chromosome 19q13 in 2 French families segregating autosomal dominant cardiac conduction defects as well as the large Lebanese kindred originally reported by <a href="#9" class="mim-tip-reference" title="Stephan, E. &lt;strong&gt;Hereditary bundle branch system defect: survey of a family with four affected generations.&lt;/strong&gt; Am. Heart J. 95: 89-95, 1978.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/619595/&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;619595&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0002-8703(78)90401-5&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="619595">Stephan (1978)</a>, and obtained a total multipoint lod score of 10.5, with a family-specific haplotype shared by all affected family members. The data narrowed the critical region to a 4-Mb interval flanked by CABP3 and D19S601. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=619595+20562447" 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>
<h4 href="#mimMolecularGeneticsFold" id="mimMolecularGeneticsToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
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<strong>Molecular Genetics</strong>
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<div id="mimMolecularGeneticsFold" class="collapse in mimTextToggleFold">
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<p><a href="#6" class="mim-tip-reference" title="Kruse, M., Schulze-Bahr, E., Corfield, V., Beckmann, A., Stallmeyer, B., Kurtbay, G., Ohmert, I., Schulze-Bahr, E., Brink, P., Pongs, O. &lt;strong&gt;Impaired endocytosis of the ion channel TRPM4 is associated with human progressive familial heart block type I.&lt;/strong&gt; J. Clin. Invest. 119: 2737-2744, 2009.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/19726882/&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;19726882&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=19726882[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/10.1172/JCI38292&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="19726882">Kruse et al. (2009)</a> analyzed the candidate gene TRPM4 in the Afrikaner kindred with progressive heart block originally reported by <a href="#2" class="mim-tip-reference" title="Brink, A. J., Torrington, M. &lt;strong&gt;Progressive familial heart block--two types.&lt;/strong&gt; S. Afr. Med. J. 52: 53-59, 1977.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/897853/&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;897853&lt;/a&gt;]" pmid="897853">Brink and Torrington (1977)</a> and identified a heterozygous missense mutation (E7K; <a href="/entry/606936#0001">606936.0001</a>) that segregated with the disease. Of 71 mutation carriers identified, 48 had pacemakers implanted. The mutation was not found in 230 ancestry-matched, unrelated Afrikaner controls or in 389 unrelated individuals of mixed European descent. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=897853+19726882" 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 the large Lebanese kindred originally reported by <a href="#9" class="mim-tip-reference" title="Stephan, E. &lt;strong&gt;Hereditary bundle branch system defect: survey of a family with four affected generations.&lt;/strong&gt; Am. Heart J. 95: 89-95, 1978.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/619595/&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;619595&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1016/0002-8703(78)90401-5&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="619595">Stephan (1978)</a> and 2 French families with autosomal dominant cardiac conduction defects mapping to chromosome 19q13, <a href="#7" class="mim-tip-reference" title="Liu, H., El Zein, L., Kruse, M., Guinamard, R., Beckmann, A., Bozio, A., Kurtbay, G., Megarbane, A., Ohmert, I., Blaysat, G., Villain, E., Pongs, O., Bouvagnet, P. &lt;strong&gt;Gain-of-function mutations in TRPM4 cause autosomal dominant isolated cardiac conduction disease.&lt;/strong&gt; Circ. Cardiovasc. Genet. 3: 374-385, 2010.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/20562447/&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;20562447&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1161/CIRCGENETICS.109.930867&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="20562447">Liu et al. (2010)</a> analyzed 12 candidate genes and identified 3 heterozygous missense mutations (<a href="/entry/606936#0002">606936.0002</a>-<a href="/entry/606936#0004">606936.0004</a>) in the TRPM4 gene that were found in all affected members of each family. The mutations were also detected in several family members with incomplete right bundle branch block or no block, consistent with incomplete penetrance; penetrance was calculated to be 75% for males and 54% for females. None of the variants was found in 300 ethnically matched chromosomes. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=619595+20562447" 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="#8" class="mim-tip-reference" title="Stallmeyer, B., Zumhagen, S., Denjoy, I., Duthoit, G., Hebert, J.-L., Ferrer, X., Maugenre, S., Schmitz, W., Kirchhefer, U., Schulze-Bahr, E., Guicheney, P., Schulze-Bahr, E. &lt;strong&gt;Mutational spectrum in the Ca(2+)-activated cation channel gene TRPM4 in patients with cardiac conductance disturbances.&lt;/strong&gt; Hum. Mutat. 33: 109-117, 2012.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/21887725/&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;21887725&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/humu.21599&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="21887725">Stallmeyer et al. (2012)</a> analyzed the TRPM4 gene in 160 unrelated patients with various types of inherited cardiac arrhythmias and identified 8 missense mutations in 8 patients (see, e.g., <a href="/entry/606936#0002">606936.0002</a> and <a href="/entry/606936#0004">606936.0004</a>-<a href="/entry/606936#0006">606936.0006</a>), including 5 (26.3%) of 19 patients with RBBB and 3 (11.5%) of 26 patients with atrioventricular block. No mutations were identified in patients with other types of cardiac arrhythmias. Noting the phenotypic variability in the mutation-positive patients, <a href="#8" class="mim-tip-reference" title="Stallmeyer, B., Zumhagen, S., Denjoy, I., Duthoit, G., Hebert, J.-L., Ferrer, X., Maugenre, S., Schmitz, W., Kirchhefer, U., Schulze-Bahr, E., Guicheney, P., Schulze-Bahr, E. &lt;strong&gt;Mutational spectrum in the Ca(2+)-activated cation channel gene TRPM4 in patients with cardiac conductance disturbances.&lt;/strong&gt; Hum. Mutat. 33: 109-117, 2012.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/21887725/&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;21887725&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/humu.21599&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="21887725">Stallmeyer et al. (2012)</a> suggested that additional factors might modulate the disease phenotype in some patients. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21887725" 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>Exclusion Studies</em></strong></p><p>
In selected affected members of the family originally reported by <a href="#2" class="mim-tip-reference" title="Brink, A. J., Torrington, M. &lt;strong&gt;Progressive familial heart block--two types.&lt;/strong&gt; S. Afr. Med. J. 52: 53-59, 1977.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/897853/&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;897853&lt;/a&gt;]" pmid="897853">Brink and Torrington (1977)</a>, <a href="#1" class="mim-tip-reference" title="Bardien-Kruger, S., Wulff, H., Arieff, Z., Brink, P., Chandy, K. G., Corfield, V. &lt;strong&gt;Characterisation of the human voltage-gated potassium channel gene, KCNA7, a candidate gene for inherited cardiac disorders, and its exclusion as cause of progressive familial heart block I (PFHBI).&lt;/strong&gt; Europ. J. Hum. Genet. 10: 36-43, 2002.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/11896454/&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;11896454&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/sj.ejhg.5200739&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="11896454">Bardien-Kruger et al. (2002)</a> screened the coding region of the positional candidate gene KCNA7 by PCR-SSCP analysis and direct DNA sequencing and found no pathogenic sequence changes. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=897853+11896454" 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="Bardien-Kruger2002" class="mim-anchor"></a>
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Bardien-Kruger, S., Wulff, H., Arieff, Z., Brink, P., Chandy, K. G., Corfield, V.
<strong>Characterisation of the human voltage-gated potassium channel gene, KCNA7, a candidate gene for inherited cardiac disorders, and its exclusion as cause of progressive familial heart block I (PFHBI).</strong>
Europ. J. Hum. Genet. 10: 36-43, 2002.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/11896454/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">11896454</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=11896454" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1038/sj.ejhg.5200739" target="_blank">Full Text</a>]
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<a id="Brink1977" class="mim-anchor"></a>
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Brink, A. J., Torrington, M.
<strong>Progressive familial heart block--two types.</strong>
S. Afr. Med. J. 52: 53-59, 1977.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/897853/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">897853</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=897853" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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<a id="Brink1995" class="mim-anchor"></a>
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Brink, P. A., Ferreira, A., Moolman, J. C., Weymar, H. W., van der Merwe, P.-L., Corfield, V. A.
<strong>Gene for progressive familial heart block type I maps to chromosome 19q13.</strong>
Circulation 91: 1633-1640, 1995.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7882468/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7882468</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7882468" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1161/01.cir.91.6.1633" target="_blank">Full Text</a>]
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<a id="Brink1994" class="mim-anchor"></a>
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Brink, P. A., Moolman, J. C., Ferreira, A., de Jager, T., Weymar, H. W., Martell, R. W., Torrington, M., van der Merwe, P. L., Corfield, V. A.
<strong>Genetic linkage studies of progressive familial heart block, a cardiac conduction disorder.</strong>
S. Afr. J. Med. Sci. 90: 236-240, 1994.
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<a id="de Meeus1995" class="mim-anchor"></a>
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de Meeus, A., Stephan, E., Debrus, S., Jean, M.-K., Loiselet, J., Weissenbach, J., Demaille, J., Bouvagnet, P.
<strong>An isolated cardiac conduction disease maps to chromosome 19q.</strong>
Circ. Res. 77: 735-740, 1995.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/7554120/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">7554120</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7554120" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1161/01.res.77.4.735" target="_blank">Full Text</a>]
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<a id="Kruse2009" class="mim-anchor"></a>
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Kruse, M., Schulze-Bahr, E., Corfield, V., Beckmann, A., Stallmeyer, B., Kurtbay, G., Ohmert, I., Schulze-Bahr, E., Brink, P., Pongs, O.
<strong>Impaired endocytosis of the ion channel TRPM4 is associated with human progressive familial heart block type I.</strong>
J. Clin. Invest. 119: 2737-2744, 2009.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/19726882/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">19726882</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=19726882[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=19726882" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1172/JCI38292" target="_blank">Full Text</a>]
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<a id="Liu2010" class="mim-anchor"></a>
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Liu, H., El Zein, L., Kruse, M., Guinamard, R., Beckmann, A., Bozio, A., Kurtbay, G., Megarbane, A., Ohmert, I., Blaysat, G., Villain, E., Pongs, O., Bouvagnet, P.
<strong>Gain-of-function mutations in TRPM4 cause autosomal dominant isolated cardiac conduction disease.</strong>
Circ. Cardiovasc. Genet. 3: 374-385, 2010.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/20562447/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">20562447</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=20562447" 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/CIRCGENETICS.109.930867" target="_blank">Full Text</a>]
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<a id="Stallmeyer2012" class="mim-anchor"></a>
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Stallmeyer, B., Zumhagen, S., Denjoy, I., Duthoit, G., Hebert, J.-L., Ferrer, X., Maugenre, S., Schmitz, W., Kirchhefer, U., Schulze-Bahr, E., Guicheney, P., Schulze-Bahr, E.
<strong>Mutational spectrum in the Ca(2+)-activated cation channel gene TRPM4 in patients with cardiac conductance disturbances.</strong>
Hum. Mutat. 33: 109-117, 2012.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/21887725/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">21887725</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21887725" 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/humu.21599" target="_blank">Full Text</a>]
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<a id="Stephan1978" class="mim-anchor"></a>
<div class="">
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Stephan, E.
<strong>Hereditary bundle branch system defect: survey of a family with four affected generations.</strong>
Am. Heart J. 95: 89-95, 1978.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/619595/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">619595</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=619595" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1016/0002-8703(78)90401-5" target="_blank">Full Text</a>]
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<a id="Stephan1985" class="mim-anchor"></a>
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Stephan, E., Aftimos, G., Allam, C.
<strong>Familial fascicular block: histologic features of Lev's disease.</strong>
Am. Heart J. 109: 1399-1401, 1985.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/4003252/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">4003252</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=4003252" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1016/0002-8703(85)90377-1" target="_blank">Full Text</a>]
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<a id="Stephan1997" class="mim-anchor"></a>
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<p class="mim-text-font">
Stephan, E., de Meeus, A., Bouvagnet, P.
<strong>Hereditary bundle branch defect: right bundle branch blocks of different causes have different morphologic characteristics.</strong>
Am. Heart J. 133: 249-256, 1997.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/9023172/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">9023172</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9023172" 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/s0002-8703(97)70215-1" target="_blank">Full Text</a>]
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<a id="van der Merwe1988" class="mim-anchor"></a>
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<p class="mim-text-font">
van der Merwe, P.-L., Weymar, H. W., Torrington, M., Brink, A. J.
<strong>Progressive familial heart block (type I): a follow-up study after 10 years.</strong>
S. Afr. Med. J. 73: 275-276, 1988.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/3347879/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">3347879</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=3347879" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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<a id="van der Merwe1986" class="mim-anchor"></a>
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<p class="mim-text-font">
van der Merwe, P.-L., Weymar, H. W., Torrington, M., Brink, A. J.
<strong>Progressive familial heart block. Part II. Clinical and ECG confirmation of progression: report on 4 cases.</strong>
S. Afr. Med. J. 70: 356-357, 1986.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/3750143/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">3750143</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=3750143" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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Marla J. F. O'Neill - updated : 4/2/2010<br>Marla J. F. O'Neill - updated : 11/15/2007<br>Marla J. F. O'Neill - updated : 7/16/2007<br>Michael B. Petersen - updated : 8/29/2002
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<strong>#</strong> 604559
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PROGRESSIVE FAMILIAL HEART BLOCK, TYPE IB; PFHB1B
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<em>Alternative titles; symbols</em>
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PFHBIB
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<strong>SNOMEDCT:</strong> 698250005; &nbsp;
<strong>ORPHA:</strong> 871; &nbsp;
<strong>DO:</strong> 0111076; &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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19q13.33
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Progressive familial heart block, type IB
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604559
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Autosomal dominant
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3
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TRPM4
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606936
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<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because of evidence that progressive familial heart block type IB (PFHB1B) is caused by heterozygous mutation in the TRPM4 gene (606936) on chromosome 19q13.</p><p>For a phenotypic description and a discussion of genetic heterogeneity of progressive familial heart block type I, see PFHB1A (113900).</p>
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<strong>Clinical Features</strong>
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<p>Brink and Torrington (1977) reported a 6-generation South African family of Portuguese and French ancestry with 261 known relatives, in which conduction defects segregated in an autosomal dominant pattern. Of 55 members in the last 3 generations who underwent electrocardiography, 31 had conduction abnormalities, including 16 with monofascicular right bundle branch block (RBBB), 3 with left anterior hemiblock, and 6 with complete heart block; another 6 individuals had a mildly prolonged QT interval or short PR interval without a Wolff-Parkinson-White (194200) pattern. The average age at which a pacemaker was implanted in the 3 successive generations decreased from 54.5 years in the fourth to 25 years in the fifth to 1 year of age in the sixth generation. Sudden cardiac death occurred in 22 individuals over the 3 generations, also at increasingly younger ages, dropping from an average of 50.7 years to 44.7 years to 12.3 years in the fourth, fifth, and sixth generations, respectively. Van der Merwe et al. (1986) and van der Merwe et al. (1988) provided follow-up information on the kindred reported by Brink and Torrington (1977) and documented the progressive nature of the disorder. </p><p>Stephan (1978) studied a Lebanese kindred with over 265 living descendants of a polygamous progenitor who was known to have had a slow pulse and syncope. Many examples of conduction defects, mainly right bundle branch block, left anterior hemiblock, bifascicular block and atrioventricular (AV) block, were found in his descendants. The abnormality was thought to be congenital, with a pedigree pattern consistent with autosomal dominant inheritance. However, 1 person presented with complete heart block at age 41. </p><p>Stephan et al. (1997) provided follow-up on the Lebanese kindred reported by Stephan (1978). They considered the most appropriate designation for this disorder to be 'hereditary bundle branch defect' (HBBD). Stephan et al. (1985) reported an autopsied case. There were over 400 descendants of the progenitor in 5 generations. Stephan et al. (1997) studied the evolution of the disorder in this kindred over a 2-decade period, described a variety of electrocardiographic abnormalities encountered in the family, and reassessed penetrance. A total of 396 persons had at least one clinical examination and electrocardiogram, of whom 47 were judged affected and 36 'indeterminate.' The conduction block may be overt in the first year of life, and among affected individuals there was a worsening of the conduction block in 5 to 15% of cases, leading to complete atrioventricular block and possibly to sudden death. A group of individuals had QRS anomalies in right precordial leads, possibly indicating partial right bundle branch block. A high proportion of these were identified as mutation carriers (the disorder in this family was shown to map to 19q) and about one-fifth of these patients evolved toward a complete fascicular block. By contrast, mutation carriers with a normal electrocardiogram remained normal. Mutation carriers demonstrated a conduction block significantly more often in males than females (75% and 50%, respectively). Brink et al. (1994, 1995) had found almost 100% penetrance in their South African family. Stephan et al. (1997) presented a table of penetrance values estimated from 9 other families as well as their own. </p><p>Liu et al. (2010) studied the large Lebanese kindred with autosomal dominant isolated cardiac conduction block, originally reported by Stephan (1978), as well as 2 French families with a variety of cardiac conduction blocks segregating in an autosomal dominant fashion. Altogether, there were 2 cases of isolated left axis deviation (LAD), 10 cases of complete right bundle branch block, 16 cases of incomplete RBBB, 15 cases of complete RBBB with LAD, 6 cases of complete RBBB with right axis deviation (RAD), and 7 cases of complete atrioventricular conduction block. Liu et al. (2010) observed 2 remarkable features in the 3 families: no family member had left bundle branch block (LBBB), complete or incomplete, and no other cardiac anomalies were found on repeated cardiac investigations, including echocardiogram, stress test, ambulatory electrocardiogram, and heart scintigraphy. The authors concluded that the 3 families shared an autosomal dominant disease resulting in any conduction block but LBBB, and no other cardiac anomalies. </p>
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<strong>Mapping</strong>
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<p>Brink et al. (1995) analyzed the large South African kindred reported by Brink and Torrington (1977) and demonstrated linkage to 19q13.2-q13.3. They pointed out that this kindred descended from an ancestor who emigrated from Portugal in 1696. It had been estimated that there may be between 1,000 and 9,000 gene carriers among his descendants. Maximum 2-point lod scores were 6.49 at theta = 0.0 for kallikrein (KLK1; 147910), 5.72 at theta = 0.01 for the myotonic dystrophy locus (DM; 160900), 3.44 at theta = 0.0 for the creatine kinase muscle-type locus (CKM; 123310), and 4.51 at theta = 0.10 for the apolipoprotein C2 locus (APOC2; 608083). Brink et al. (1995) noted that the gene for myotonin protein kinase, which is implicated as a cause of myotonic dystrophy, lies within this region and that myotonic dystrophy is a disease complicated by heart block and other conduction abnormalities; however, a recombination event ruled out the myotonic dystrophy locus from direct involvement with PFHB1B. </p><p>Using a genomewide screening approach with polymorphic (CA)n repeat markers in the Lebanese family originally described by Stephan (1978), de Meeus et al. (1995) obtained a maximum multipoint lod score of 7.18 at D19S604 on chromosome 19q13.3. Flanking loci D19S606 and D19S571 were excluded due to a recombination event in 3 affected individuals, narrowing the critical region to a 13-cM interval. </p><p>Using additional microsatellite markers in the Afrikaner kindred with progressive heart block originally reported by Brink and Torrington (1977), Kruse et al. (2009) narrowed the PFHB1B locus to a 0.5-Mb interval between markers D19S1059 and D19S604 on chromosome 19q13.33 containing approximately 25 genes. </p><p>Liu et al. (2010) analyzed polymorphic markers on chromosome 19q13 in 2 French families segregating autosomal dominant cardiac conduction defects as well as the large Lebanese kindred originally reported by Stephan (1978), and obtained a total multipoint lod score of 10.5, with a family-specific haplotype shared by all affected family members. The data narrowed the critical region to a 4-Mb interval flanked by CABP3 and D19S601. </p>
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<strong>Molecular Genetics</strong>
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<p>Kruse et al. (2009) analyzed the candidate gene TRPM4 in the Afrikaner kindred with progressive heart block originally reported by Brink and Torrington (1977) and identified a heterozygous missense mutation (E7K; 606936.0001) that segregated with the disease. Of 71 mutation carriers identified, 48 had pacemakers implanted. The mutation was not found in 230 ancestry-matched, unrelated Afrikaner controls or in 389 unrelated individuals of mixed European descent. </p><p>In the large Lebanese kindred originally reported by Stephan (1978) and 2 French families with autosomal dominant cardiac conduction defects mapping to chromosome 19q13, Liu et al. (2010) analyzed 12 candidate genes and identified 3 heterozygous missense mutations (606936.0002-606936.0004) in the TRPM4 gene that were found in all affected members of each family. The mutations were also detected in several family members with incomplete right bundle branch block or no block, consistent with incomplete penetrance; penetrance was calculated to be 75% for males and 54% for females. None of the variants was found in 300 ethnically matched chromosomes. </p><p>Stallmeyer et al. (2012) analyzed the TRPM4 gene in 160 unrelated patients with various types of inherited cardiac arrhythmias and identified 8 missense mutations in 8 patients (see, e.g., 606936.0002 and 606936.0004-606936.0006), including 5 (26.3%) of 19 patients with RBBB and 3 (11.5%) of 26 patients with atrioventricular block. No mutations were identified in patients with other types of cardiac arrhythmias. Noting the phenotypic variability in the mutation-positive patients, Stallmeyer et al. (2012) suggested that additional factors might modulate the disease phenotype in some patients. </p><p><strong><em>Exclusion Studies</em></strong></p><p>
In selected affected members of the family originally reported by Brink and Torrington (1977), Bardien-Kruger et al. (2002) screened the coding region of the positional candidate gene KCNA7 by PCR-SSCP analysis and direct DNA sequencing and found no pathogenic sequence changes. </p>
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<h4>
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<strong>REFERENCES</strong>
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<li>
<p class="mim-text-font">
Bardien-Kruger, S., Wulff, H., Arieff, Z., Brink, P., Chandy, K. G., Corfield, V.
<strong>Characterisation of the human voltage-gated potassium channel gene, KCNA7, a candidate gene for inherited cardiac disorders, and its exclusion as cause of progressive familial heart block I (PFHBI).</strong>
Europ. J. Hum. Genet. 10: 36-43, 2002.
[PubMed: 11896454]
[Full Text: https://doi.org/10.1038/sj.ejhg.5200739]
</p>
</li>
<li>
<p class="mim-text-font">
Brink, A. J., Torrington, M.
<strong>Progressive familial heart block--two types.</strong>
S. Afr. Med. J. 52: 53-59, 1977.
[PubMed: 897853]
</p>
</li>
<li>
<p class="mim-text-font">
Brink, P. A., Ferreira, A., Moolman, J. C., Weymar, H. W., van der Merwe, P.-L., Corfield, V. A.
<strong>Gene for progressive familial heart block type I maps to chromosome 19q13.</strong>
Circulation 91: 1633-1640, 1995.
[PubMed: 7882468]
[Full Text: https://doi.org/10.1161/01.cir.91.6.1633]
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<li>
<p class="mim-text-font">
Brink, P. A., Moolman, J. C., Ferreira, A., de Jager, T., Weymar, H. W., Martell, R. W., Torrington, M., van der Merwe, P. L., Corfield, V. A.
<strong>Genetic linkage studies of progressive familial heart block, a cardiac conduction disorder.</strong>
S. Afr. J. Med. Sci. 90: 236-240, 1994.
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<li>
<p class="mim-text-font">
de Meeus, A., Stephan, E., Debrus, S., Jean, M.-K., Loiselet, J., Weissenbach, J., Demaille, J., Bouvagnet, P.
<strong>An isolated cardiac conduction disease maps to chromosome 19q.</strong>
Circ. Res. 77: 735-740, 1995.
[PubMed: 7554120]
[Full Text: https://doi.org/10.1161/01.res.77.4.735]
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<li>
<p class="mim-text-font">
Kruse, M., Schulze-Bahr, E., Corfield, V., Beckmann, A., Stallmeyer, B., Kurtbay, G., Ohmert, I., Schulze-Bahr, E., Brink, P., Pongs, O.
<strong>Impaired endocytosis of the ion channel TRPM4 is associated with human progressive familial heart block type I.</strong>
J. Clin. Invest. 119: 2737-2744, 2009.
[PubMed: 19726882]
[Full Text: https://doi.org/10.1172/JCI38292]
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<li>
<p class="mim-text-font">
Liu, H., El Zein, L., Kruse, M., Guinamard, R., Beckmann, A., Bozio, A., Kurtbay, G., Megarbane, A., Ohmert, I., Blaysat, G., Villain, E., Pongs, O., Bouvagnet, P.
<strong>Gain-of-function mutations in TRPM4 cause autosomal dominant isolated cardiac conduction disease.</strong>
Circ. Cardiovasc. Genet. 3: 374-385, 2010.
[PubMed: 20562447]
[Full Text: https://doi.org/10.1161/CIRCGENETICS.109.930867]
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<p class="mim-text-font">
Stallmeyer, B., Zumhagen, S., Denjoy, I., Duthoit, G., Hebert, J.-L., Ferrer, X., Maugenre, S., Schmitz, W., Kirchhefer, U., Schulze-Bahr, E., Guicheney, P., Schulze-Bahr, E.
<strong>Mutational spectrum in the Ca(2+)-activated cation channel gene TRPM4 in patients with cardiac conductance disturbances.</strong>
Hum. Mutat. 33: 109-117, 2012.
[PubMed: 21887725]
[Full Text: https://doi.org/10.1002/humu.21599]
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<li>
<p class="mim-text-font">
Stephan, E.
<strong>Hereditary bundle branch system defect: survey of a family with four affected generations.</strong>
Am. Heart J. 95: 89-95, 1978.
[PubMed: 619595]
[Full Text: https://doi.org/10.1016/0002-8703(78)90401-5]
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<p class="mim-text-font">
Stephan, E., Aftimos, G., Allam, C.
<strong>Familial fascicular block: histologic features of Lev&#x27;s disease.</strong>
Am. Heart J. 109: 1399-1401, 1985.
[PubMed: 4003252]
[Full Text: https://doi.org/10.1016/0002-8703(85)90377-1]
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<li>
<p class="mim-text-font">
Stephan, E., de Meeus, A., Bouvagnet, P.
<strong>Hereditary bundle branch defect: right bundle branch blocks of different causes have different morphologic characteristics.</strong>
Am. Heart J. 133: 249-256, 1997.
[PubMed: 9023172]
[Full Text: https://doi.org/10.1016/s0002-8703(97)70215-1]
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<li>
<p class="mim-text-font">
van der Merwe, P.-L., Weymar, H. W., Torrington, M., Brink, A. J.
<strong>Progressive familial heart block (type I): a follow-up study after 10 years.</strong>
S. Afr. Med. J. 73: 275-276, 1988.
[PubMed: 3347879]
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<li>
<p class="mim-text-font">
van der Merwe, P.-L., Weymar, H. W., Torrington, M., Brink, A. J.
<strong>Progressive familial heart block. Part II. Clinical and ECG confirmation of progression: report on 4 cases.</strong>
S. Afr. Med. J. 70: 356-357, 1986.
[PubMed: 3750143]
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Marla J. F. O&#x27;Neill - updated : 7/9/2012<br>Marla J. F. O&#x27;Neill - updated : 4/2/2010<br>Marla J. F. O&#x27;Neill - updated : 11/15/2007<br>Marla J. F. O&#x27;Neill - updated : 7/16/2007<br>Michael B. Petersen - updated : 8/29/2002
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Victor A. McKusick : 2/17/2000
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carol : 07/21/2015<br>carol : 7/12/2012<br>terry : 7/9/2012<br>terry : 7/9/2012<br>carol : 4/2/2010<br>terry : 4/2/2010<br>carol : 11/15/2007<br>alopez : 10/4/2007<br>wwang : 7/20/2007<br>terry : 7/16/2007<br>carol : 8/23/2006<br>carol : 8/23/2006<br>joanna : 3/19/2004<br>ckniffin : 9/24/2003<br>cwells : 9/3/2002<br>cwells : 8/29/2002<br>alopez : 3/8/2002<br>cwells : 11/30/2001<br>alopez : 4/10/2001<br>mcapotos : 8/30/2000<br>mgross : 2/17/2000
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