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Entry
- #610353 - EPILEPSY, NOCTURNAL FRONTAL LOBE, 4; ENFL4
- OMIM
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<span class="h4">#610353</span>
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<strong>Table of Contents</strong>
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<a href="#phenotypeMap"><strong>Phenotype-Gene Relationships</strong></a>
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<a href="/clinicalSynopsis/610353"><strong>Clinical Synopsis</strong></a>
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<a href="/phenotypicSeries/PS600513,PS601764"> <strong>Phenotypic Series</strong> </a>
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<a href="#description">Description</a>
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<a href="#clinicalFeatures">Clinical Features</a>
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<a href="#inheritance">Inheritance</a>
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<a href="#molecularGenetics">Molecular Genetics</a>
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<a href="#references"><strong>References</strong></a>
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<div><a href="https://wormbase.org/search/disease/DOID:0060685 DOID:0081119" class="mim-tip-hint" title="Database of the biology and genome of Caenorhabditis elegans and related nematodes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Disease Ontology', 'domain': 'wormbase.org'})">Wormbase Disease Ontology</a></div>
</div>
</div>
</div>
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<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;
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<div class="col-lg-8 col-lg-pull-2 col-md-8 col-md-pull-2 col-sm-8 col-sm-pull-2 col-xs-12">
<div>
<a id="title" class="mim-anchor"></a>
<div>
<a id="number" class="mim-anchor"></a>
<div class="text-right">
<a href="#" class="mim-tip-icd" qtip_title="<strong>ICD+</strong>" qtip_text="
<strong>ORPHA:</strong> 98784<br />
<strong>DO:</strong> 0060685, 0081119<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>
610353
</span>
</span>
</div>
</div>
<div>
<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
EPILEPSY, NOCTURNAL FRONTAL LOBE, 4; ENFL4
</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">
EPILEPSY, FAMILIAL, WITH NOCTURNAL WANDERING AND ICTAL FEAR
</span>
</h4>
</div>
</div>
<div>
<br />
</div>
<div>
<a id="includedTitles" class="mim-anchor"></a>
<div>
<p>
<span class="mim-font">
Other entities represented in this entry:
</span>
</p>
</div>
<div>
<span class="h3 mim-font">
SEIZURES, BENIGN FAMILIAL INFANTILE, 6, INCLUDED; BFIS6, INCLUDED
</span>
</div>
<div>
<span class="h4 mim-font">
CONVULSIONS, BENIGN FAMILIAL INFANTILE, 6, INCLUDED; BFIC6, INCLUDED
</span>
</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/8/151?start=-3&limit=10&highlight=151">
8p21.2
</a>
</span>
</td>
<td>
<span class="mim-font">
Epilepsy, nocturnal frontal lobe, type 4
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610353"> 610353 </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">
CHRNA2
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118502"> 118502 </a>
</span>
</td>
</tr>
</tbody>
</table>
</div>
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<li><a href="/graph/linear/610353" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
<li><a href="/graph/radial/610353" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Radial'})"> Radial </a></li>
</ul>
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<span class="glyphicon glyphicon-question-sign mim-tip-hint" title="OMIM PheneGene graphics depict relationships between phenotypes, groups of related phenotypes (Phenotypic Series), and genes.<br /><a href='/static/omim/pdf/OMIM_Graphics.pdf' target='_blank'>A quick reference overview and guide (PDF)</a>"></span>
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<div 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> NEUROLOGIC </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<div>
<span class="h5 mim-font">
<em> Central Nervous System </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Seizures, nocturnal, usually occur in clusters <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4692956&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4692956</a>]</span><br /> -
Day time seizures may also occur <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4692957&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4692957</a>]</span><br /> -
Normal psychomotor development <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/9908006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">9908006</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0520948&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0520948</a>]</span><br /> -
Sudden awakening <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674582&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674582</a>]</span><br /> -
Unintelligible speech, vocalizations, grunting <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674583&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674583</a>]</span><br /> -
Gestural automatisms <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4692958&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4692958</a>]</span><br /> -
Posturing dystonia <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4692959&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4692959</a>]</span><br /> -
Postictal confusion <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/44031002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">44031002</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0751053&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0751053</a>]</span><br /> -
Fearful expression <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674584&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674584</a>]</span><br /> -
Frightening sensation <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674585&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674585</a>]</span><br /> -
Tingling sensation <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/62507009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">62507009</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2242996&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2242996</a>]</span><br /> -
Shivering sensation <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674586&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674586</a>]</span><br /> -
Complex motor behavior such as sleep walking <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674587&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674587</a>]</span><br /> -
Hypermotor behavior <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674588&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674588</a>]</span><br /> -
Tongue movements, protrusions <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674589&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674589</a>]</span><br /> -
Febrile and afebrile seizures (in some patients) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4692960&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4692960</a>]</span><br /> -
EEG shows frontal lobe origin <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C2674590&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C2674590</a>]</span><br /> -
Sleep-related paroxysmal epileptic arousals <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C4694106&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C4694106</a>]</span><br />
</span>
</div>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> MISCELLANEOUS </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Onset in childhood (mean age 10 years)<br /> -
May be misdiagnosed as nightmares, night terrors, parasomnias, or psychiatric disorders (in some patients)<br /> -
Favorable response to antiepileptic medication<br /> -
Frequency and severity of seizures tends to decrease with age<br /> -
Incomplete penetrance <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1836598&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1836598</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003829" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003829</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003829" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003829</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> MOLECULAR BASIS </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Caused by mutation in the neuronal nicotinic cholinergic receptor, alpha polypeptide 2 gene (CHRNA2, <a href="/entry/118502#0001">118502.0001</a>)<br />
</span>
</div>
</div>
</div>
<div class="text-right">
<a href="#mimClinicalSynopsisFold" data-toggle="collapse">&#9650;&nbsp;Close</a>
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<h5>
Epilepsy, nocturnal frontal lobe
- <a href="/phenotypicSeries/PS600513">PS600513</a>
- 5 Entries
</h5>
</div>
</div>
<div class="row" style="margin-left: 0.125em; margin-right: 0.125em;">
<table class="table table-bordered table-condensed table-hover mim-table-padding">
<thead>
<tr>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Location</strong>
</th>
<th class="col-lg-5 col-md-5 col-sm-5 col-xs-6 text-nowrap">
<strong>Phenotype</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Inheritance</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Phenotype<br />mapping key</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Phenotype<br />MIM number</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Gene/Locus</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Gene/Locus<br />MIM number</strong>
</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/1193?start=-3&limit=10&highlight=1193"> 1q21.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605375"> Epilepsy, nocturnal frontal lobe, 3 </a>
</span>
</td>
<td>
<span class="mim-font">
</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/605375"> 605375 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118507"> CHRNB2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118507"> 118507 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/151?start=-3&limit=10&highlight=151"> 8p21.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610353"> Epilepsy, nocturnal frontal lobe, type 4 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610353"> 610353 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118502"> CHRNA2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118502"> 118502 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/9/642?start=-3&limit=10&highlight=642"> 9q34.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615005"> Epilepsy nocturnal frontal lobe, 5 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615005"> 615005 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608167"> KCNT1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608167"> 608167 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/15/355?start=-3&limit=10&highlight=355"> 15q24 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603204"> Epilepsy, nocturnal frontal lobe, type 2 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603204"> 603204 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603204"> ENFL2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603204"> 603204 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/20/470?start=-3&limit=10&highlight=470"> 20q13.33 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600513"> Epilepsy, nocturnal frontal lobe, 1 </a>
</span>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
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<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/600513"> 600513 </a>
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<span class="mim-font">
<a href="/entry/118504"> CHRNA4 </a>
</span>
</td>
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<span class="mim-font">
<a href="/entry/118504"> 118504 </a>
</span>
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<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
<h5>
Seizures, benign familial infantile
- <a href="/phenotypicSeries/PS601764">PS601764</a>
- 6 Entries
</h5>
</div>
</div>
<div class="row" style="margin-left: 0.125em; margin-right: 0.125em;">
<table class="table table-bordered table-condensed table-hover mim-table-padding">
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<strong>Location</strong>
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<strong>Phenotype</strong>
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<strong>Inheritance</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Phenotype<br />mapping key</strong>
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<strong>Phenotype<br />MIM number</strong>
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<strong>Gene/Locus</strong>
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<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Gene/Locus<br />MIM number</strong>
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<td>
<span class="mim-font">
<a href="/geneMap/1/237?start=-3&limit=10&highlight=237"> 1p36.12-p35.1 </a>
</span>
</td>
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<span class="mim-font">
<a href="/entry/612627"> Seizures, benign familial infantile, 4 </a>
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<span class="mim-font">
</span>
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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/612627"> 612627 </a>
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<span class="mim-font">
<a href="/entry/612627"> BFIS4 </a>
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<span class="mim-font">
<a href="/entry/612627"> 612627 </a>
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<span class="mim-font">
<a href="/geneMap/2/736?start=-3&limit=10&highlight=736"> 2q24.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607745"> Seizures, benign familial infantile, 3 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607745"> 607745 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182390"> SCN2A </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182390"> 182390 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/151?start=-3&limit=10&highlight=151"> 8p21.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610353"> Epilepsy, nocturnal frontal lobe, type 4 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610353"> 610353 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118502"> CHRNA2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118502"> 118502 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/390?start=-3&limit=10&highlight=390"> 12q13.13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/617080"> Seizures, benign familial infantile, 5 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/617080"> 617080 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600702"> SCN8A </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600702"> 600702 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/16/330?start=-3&limit=10&highlight=330"> 16p11.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605751"> Seizures, benign familial infantile, 2 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605751"> 605751 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614386"> PRRT2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614386"> 614386 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/19/519?start=-3&limit=10&highlight=519"> 19q </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601764"> Seizures, benign familial infantile, 1 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601764"> 601764 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601764"> BFIS1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601764"> 601764 </a>
</span>
</td>
</tr>
</tbody>
</table>
</div>
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<a href="#mimPhenotypicSeriesFold" data-toggle="collapse">&#9650;&nbsp;Close</a>
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<a id="text" class="mim-anchor"></a>
<h4 href="#mimTextFold" id="mimTextToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
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<strong>TEXT</strong>
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</h4>
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<p>A number sign (#) is used with this entry because nocturnal frontal lobe epilepsy-4 (ENFL4) is caused by heterozygous mutation in the gene encoding the neuronal nicotinic cholinergic receptor alpha-2 subunit (CHRNA2; <a href="/entry/118502">118502</a>) on chromosome 8p21.</p>
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<a id="description" class="mim-anchor"></a>
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<strong>Description</strong>
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<p>Nocturnal frontal lobe epilepsy is a childhood-onset focal epilepsy that displays clusters of sleep-related hypermotor seizures (summary by <a href="#1" class="mim-tip-reference" title="Aridon, P., Marini, C., Di Resta, C., Brilli, E., De Fusco, M., Politi, F., Parrini, E., Manfredi, I., Pisano, T., Pruna, D., Curia, G., Cianchetti, C., Pasqualetti, M., Becchetti, A., Guerrini, R., Casari, G. &lt;strong&gt;Increased sensitivity of the neuronal nicotinic receptor alpha-2 subunit causes familial epilepsy with nocturnal wandering and ictal fear.&lt;/strong&gt; Am. J. Hum. Genet. 79: 342-350, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16826524/&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;16826524&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=16826524[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1086/506459&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="16826524">Aridon et al., 2006</a>). Some patients with CHRNA2 mutations may have a slightly different phenotype that is more consistent with a clinical diagnosis of benign familial infantile seizures (BFIS6) (<a href="#3" class="mim-tip-reference" title="Trivisano, M., Terracciano, A., Milano, T., Cappelletti, S., Pietrafusa, N., Bertini, E. S., Vigevano, F., Specchio, N. &lt;strong&gt;Mutation of CHRNA2 in a family with benign familial infantile seizures: potential role of nicotinic acetylcholine receptor in various phenotypes of epilepsy.&lt;/strong&gt; Epilepsia 56: e53-e57, 2015.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/25847220/&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;25847220&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/epi.12967&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="25847220">Trivisano et al., 2015</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?term=25847220+16826524" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>For a general phenotypic description and a discussion of genetic heterogeneity of nocturnal frontal lobe epilepsy, see ENFL1 (<a href="/entry/600513">600513</a>).</p><p>For a general phenotypic description and a discussion of genetic heterogeneity of benign familial infantile seizures, see BFIS1 (<a href="/entry/601764">601764</a>).</p>
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<a id="clinicalFeatures" class="mim-anchor"></a>
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<strong>Clinical Features</strong>
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<p><a href="#1" class="mim-tip-reference" title="Aridon, P., Marini, C., Di Resta, C., Brilli, E., De Fusco, M., Politi, F., Parrini, E., Manfredi, I., Pisano, T., Pruna, D., Curia, G., Cianchetti, C., Pasqualetti, M., Becchetti, A., Guerrini, R., Casari, G. &lt;strong&gt;Increased sensitivity of the neuronal nicotinic receptor alpha-2 subunit causes familial epilepsy with nocturnal wandering and ictal fear.&lt;/strong&gt; Am. J. Hum. Genet. 79: 342-350, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16826524/&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;16826524&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=16826524[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1086/506459&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="16826524">Aridon et al. (2006)</a> reported a Sardinian family in which 10 members had a sleep-related epilepsy inherited in an autosomal dominant pattern. Mean age at onset was 10 years (range 4 to 29). The phenotype was characterized by episodes of sudden awakening, vocalization or grunting, fearful expression, fear sensation, tongue movements, and nocturnal wandering, suggesting frontolimbic involvement. Complex motor behaviors and nocturnal wanderings were more frequent in childhood, and both frequency and severity of the episodes tended to decrease with age. EEG of 4 affected family members showed frontal lobe involvement. The attacks had been interpreted in some as nightmares and sleep walking. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16826524" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#2" class="mim-tip-reference" title="Conti, V., Aracri, P., Chiti, L., Brusco, S., Mari, F., Marini, C., Albanese, M., Marchi, A., Liguori, C., Placidi, F., Romigi, A., Becchetti, A., Guerrini, R. &lt;strong&gt;Nocturnal frontal lobe epilepsy with paroxysmal arousals due to CHRNA2 loss of function.&lt;/strong&gt; Neurology 84: 1520-1528, 2015.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/25770198/&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;25770198&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/WNL.0000000000001471&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="25770198">Conti et al. (2015)</a> reported a family in which 7 individuals had nocturnal frontal lobe epilepsy. Six of the patients had onset of seizures between 3 and 10 years, whereas 1 patient had onset of seizures at age 16. The features were homogeneous, characterized by paroxysmal arousal during sleep, often accompanied by gestural automatisms or posturing dystonia, vocalizations, and postictal confusion. EEG studies showed sleep-related paroxysmal epileptic arousals, and interictal EEG showed frontal spikes and slow waves. All patients responded to treatment with oxcarbazepine. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25770198" 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>Benign Familial Infantile Seizures 6</em></strong></p><p>
<a href="#3" class="mim-tip-reference" title="Trivisano, M., Terracciano, A., Milano, T., Cappelletti, S., Pietrafusa, N., Bertini, E. S., Vigevano, F., Specchio, N. &lt;strong&gt;Mutation of CHRNA2 in a family with benign familial infantile seizures: potential role of nicotinic acetylcholine receptor in various phenotypes of epilepsy.&lt;/strong&gt; Epilepsia 56: e53-e57, 2015.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/25847220/&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;25847220&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/epi.12967&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="25847220">Trivisano et al. (2015)</a> reported a family in which a father and his 2 daughters had a relatively benign seizure disorder with onset in the first years of life. The 35-year-old father, who had normal neurologic development and function, had onset of febrile and afebrile seizures at 8 months of age. He was treated with medication until age 10 years, at which time treatment was withdrawn with no further seizures. His 2 daughters developed seizure clusters at ages 2 years and 6 months, respectively. The seizures were characterized by psychomotor arrest, hyper- or hypotonia, deviation of the eyes, and cyanosis. The seizures or EEG abnormalities tended to be worse at night. Both daughters were successfully treated with medication and both had normal psychomotor development. A third daughter, who did not carry the mutation, had a phenocopy manifest as benign myoclonus in infancy that remitted spontaneously. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25847220" 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="inheritance" class="mim-anchor"></a>
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<strong>Inheritance</strong>
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<p>The transmission pattern of ENFL4 in the family reported by <a href="#1" class="mim-tip-reference" title="Aridon, P., Marini, C., Di Resta, C., Brilli, E., De Fusco, M., Politi, F., Parrini, E., Manfredi, I., Pisano, T., Pruna, D., Curia, G., Cianchetti, C., Pasqualetti, M., Becchetti, A., Guerrini, R., Casari, G. &lt;strong&gt;Increased sensitivity of the neuronal nicotinic receptor alpha-2 subunit causes familial epilepsy with nocturnal wandering and ictal fear.&lt;/strong&gt; Am. J. Hum. Genet. 79: 342-350, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16826524/&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;16826524&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=16826524[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1086/506459&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="16826524">Aridon et al. (2006)</a> was consistent with autosomal dominant inheritance and incomplete penetrance. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16826524" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>In all 10 affected members of a Sardinian family with nocturnal frontal lobe epilepsy, <a href="#1" class="mim-tip-reference" title="Aridon, P., Marini, C., Di Resta, C., Brilli, E., De Fusco, M., Politi, F., Parrini, E., Manfredi, I., Pisano, T., Pruna, D., Curia, G., Cianchetti, C., Pasqualetti, M., Becchetti, A., Guerrini, R., Casari, G. &lt;strong&gt;Increased sensitivity of the neuronal nicotinic receptor alpha-2 subunit causes familial epilepsy with nocturnal wandering and ictal fear.&lt;/strong&gt; Am. J. Hum. Genet. 79: 342-350, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16826524/&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;16826524&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=16826524[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1086/506459&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="16826524">Aridon et al. (2006)</a> identified a heterozygous missense mutation in the CHRNA2 gene (I279N; <a href="/entry/118502#0001">118502.0001</a>). One unaffected family member carried the mutation, indicating incomplete penetrance. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16826524" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In 7 affected members of a large family with ENFL4, <a href="#2" class="mim-tip-reference" title="Conti, V., Aracri, P., Chiti, L., Brusco, S., Mari, F., Marini, C., Albanese, M., Marchi, A., Liguori, C., Placidi, F., Romigi, A., Becchetti, A., Guerrini, R. &lt;strong&gt;Nocturnal frontal lobe epilepsy with paroxysmal arousals due to CHRNA2 loss of function.&lt;/strong&gt; Neurology 84: 1520-1528, 2015.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/25770198/&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;25770198&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/WNL.0000000000001471&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="25770198">Conti et al. (2015)</a> identified a heterozygous missense mutation in the CHRNA2 gene (I297F; <a href="/entry/118502#0002">118502.0002</a>). The mutation, which was found by targeted sequencing of 150 probands with a similar disorder, segregated with the disorder in the family. In vitro functional expression studies in HEK293 cells showed that the heterozygous mutation resulted in a reduction in current density to about 40% of wildtype values. Homozygosity for the mutation resulted in no measurable currents. These findings were consistent with a loss of receptor function. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25770198" 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 affected members of a family with BFIS6, <a href="#3" class="mim-tip-reference" title="Trivisano, M., Terracciano, A., Milano, T., Cappelletti, S., Pietrafusa, N., Bertini, E. S., Vigevano, F., Specchio, N. &lt;strong&gt;Mutation of CHRNA2 in a family with benign familial infantile seizures: potential role of nicotinic acetylcholine receptor in various phenotypes of epilepsy.&lt;/strong&gt; Epilepsia 56: e53-e57, 2015.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/25847220/&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;25847220&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/epi.12967&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="25847220">Trivisano et al. (2015)</a> identified a heterozygous missense mutation in the CHRNA2 gene (R376W; <a href="/entry/118502#0003">118502.0003</a>). The mutation, which was found by targeted sequencing and confirmed by Sanger sequencing, segregated with the disorder in the family. Functional studies of the variant and studies of patient cells were not performed. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25847220" 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="1" class="mim-anchor"></a>
<a id="Aridon2006" class="mim-anchor"></a>
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Aridon, P., Marini, C., Di Resta, C., Brilli, E., De Fusco, M., Politi, F., Parrini, E., Manfredi, I., Pisano, T., Pruna, D., Curia, G., Cianchetti, C., Pasqualetti, M., Becchetti, A., Guerrini, R., Casari, G.
<strong>Increased sensitivity of the neuronal nicotinic receptor alpha-2 subunit causes familial epilepsy with nocturnal wandering and ictal fear.</strong>
Am. J. Hum. Genet. 79: 342-350, 2006.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16826524/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16826524</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=16826524[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=16826524" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1086/506459" target="_blank">Full Text</a>]
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<a id="2" class="mim-anchor"></a>
<a id="Conti2015" class="mim-anchor"></a>
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<p class="mim-text-font">
Conti, V., Aracri, P., Chiti, L., Brusco, S., Mari, F., Marini, C., Albanese, M., Marchi, A., Liguori, C., Placidi, F., Romigi, A., Becchetti, A., Guerrini, R.
<strong>Nocturnal frontal lobe epilepsy with paroxysmal arousals due to CHRNA2 loss of function.</strong>
Neurology 84: 1520-1528, 2015.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/25770198/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">25770198</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25770198" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1212/WNL.0000000000001471" target="_blank">Full Text</a>]
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<a id="Trivisano2015" class="mim-anchor"></a>
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<p class="mim-text-font">
Trivisano, M., Terracciano, A., Milano, T., Cappelletti, S., Pietrafusa, N., Bertini, E. S., Vigevano, F., Specchio, N.
<strong>Mutation of CHRNA2 in a family with benign familial infantile seizures: potential role of nicotinic acetylcholine receptor in various phenotypes of epilepsy.</strong>
Epilepsia 56: e53-e57, 2015.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/25847220/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">25847220</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=25847220" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1111/epi.12967" target="_blank">Full Text</a>]
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Cassandra L. Kniffin - updated : 04/18/2018
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Cassandra L. Kniffin : 8/24/2006
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alopez : 04/19/2018
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ckniffin : 04/18/2018<br>carol : 01/08/2013<br>wwang : 8/28/2006<br>ckniffin : 8/24/2006
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<strong>#</strong> 610353
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EPILEPSY, NOCTURNAL FRONTAL LOBE, 4; ENFL4
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<em>Alternative titles; symbols</em>
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<h4>
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EPILEPSY, FAMILIAL, WITH NOCTURNAL WANDERING AND ICTAL FEAR
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Other entities represented in this entry:
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SEIZURES, BENIGN FAMILIAL INFANTILE, 6, INCLUDED; BFIS6, INCLUDED
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CONVULSIONS, BENIGN FAMILIAL INFANTILE, 6, INCLUDED; BFIC6, INCLUDED
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<strong>ORPHA:</strong> 98784; &nbsp;
<strong>DO:</strong> 0060685, 0081119; &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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<span class="mim-font">
8p21.2
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Epilepsy, nocturnal frontal lobe, type 4
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610353
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Autosomal dominant
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3
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CHRNA2
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118502
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<span class="mim-font">
<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because nocturnal frontal lobe epilepsy-4 (ENFL4) is caused by heterozygous mutation in the gene encoding the neuronal nicotinic cholinergic receptor alpha-2 subunit (CHRNA2; 118502) on chromosome 8p21.</p>
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<strong>Description</strong>
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<p>Nocturnal frontal lobe epilepsy is a childhood-onset focal epilepsy that displays clusters of sleep-related hypermotor seizures (summary by Aridon et al., 2006). Some patients with CHRNA2 mutations may have a slightly different phenotype that is more consistent with a clinical diagnosis of benign familial infantile seizures (BFIS6) (Trivisano et al., 2015). </p><p>For a general phenotypic description and a discussion of genetic heterogeneity of nocturnal frontal lobe epilepsy, see ENFL1 (600513).</p><p>For a general phenotypic description and a discussion of genetic heterogeneity of benign familial infantile seizures, see BFIS1 (601764).</p>
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<strong>Clinical Features</strong>
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<p>Aridon et al. (2006) reported a Sardinian family in which 10 members had a sleep-related epilepsy inherited in an autosomal dominant pattern. Mean age at onset was 10 years (range 4 to 29). The phenotype was characterized by episodes of sudden awakening, vocalization or grunting, fearful expression, fear sensation, tongue movements, and nocturnal wandering, suggesting frontolimbic involvement. Complex motor behaviors and nocturnal wanderings were more frequent in childhood, and both frequency and severity of the episodes tended to decrease with age. EEG of 4 affected family members showed frontal lobe involvement. The attacks had been interpreted in some as nightmares and sleep walking. </p><p>Conti et al. (2015) reported a family in which 7 individuals had nocturnal frontal lobe epilepsy. Six of the patients had onset of seizures between 3 and 10 years, whereas 1 patient had onset of seizures at age 16. The features were homogeneous, characterized by paroxysmal arousal during sleep, often accompanied by gestural automatisms or posturing dystonia, vocalizations, and postictal confusion. EEG studies showed sleep-related paroxysmal epileptic arousals, and interictal EEG showed frontal spikes and slow waves. All patients responded to treatment with oxcarbazepine. </p><p><strong><em>Benign Familial Infantile Seizures 6</em></strong></p><p>
Trivisano et al. (2015) reported a family in which a father and his 2 daughters had a relatively benign seizure disorder with onset in the first years of life. The 35-year-old father, who had normal neurologic development and function, had onset of febrile and afebrile seizures at 8 months of age. He was treated with medication until age 10 years, at which time treatment was withdrawn with no further seizures. His 2 daughters developed seizure clusters at ages 2 years and 6 months, respectively. The seizures were characterized by psychomotor arrest, hyper- or hypotonia, deviation of the eyes, and cyanosis. The seizures or EEG abnormalities tended to be worse at night. Both daughters were successfully treated with medication and both had normal psychomotor development. A third daughter, who did not carry the mutation, had a phenocopy manifest as benign myoclonus in infancy that remitted spontaneously. </p>
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<h4>
<span class="mim-font">
<strong>Inheritance</strong>
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<p>The transmission pattern of ENFL4 in the family reported by Aridon et al. (2006) was consistent with autosomal dominant inheritance and incomplete penetrance. </p>
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<h4>
<span class="mim-font">
<strong>Molecular Genetics</strong>
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<span class="mim-text-font">
<p>In all 10 affected members of a Sardinian family with nocturnal frontal lobe epilepsy, Aridon et al. (2006) identified a heterozygous missense mutation in the CHRNA2 gene (I279N; 118502.0001). One unaffected family member carried the mutation, indicating incomplete penetrance. </p><p>In 7 affected members of a large family with ENFL4, Conti et al. (2015) identified a heterozygous missense mutation in the CHRNA2 gene (I297F; 118502.0002). The mutation, which was found by targeted sequencing of 150 probands with a similar disorder, segregated with the disorder in the family. In vitro functional expression studies in HEK293 cells showed that the heterozygous mutation resulted in a reduction in current density to about 40% of wildtype values. Homozygosity for the mutation resulted in no measurable currents. These findings were consistent with a loss of receptor function. </p><p>In affected members of a family with BFIS6, Trivisano et al. (2015) identified a heterozygous missense mutation in the CHRNA2 gene (R376W; 118502.0003). The mutation, which was found by targeted sequencing and confirmed by Sanger sequencing, segregated with the disorder in the family. Functional studies of the variant and studies of patient cells were not performed. </p>
</span>
<div>
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<h4>
<span class="mim-font">
<strong>REFERENCES</strong>
</span>
</h4>
<div>
<p />
</div>
<div>
<ol>
<li>
<p class="mim-text-font">
Aridon, P., Marini, C., Di Resta, C., Brilli, E., De Fusco, M., Politi, F., Parrini, E., Manfredi, I., Pisano, T., Pruna, D., Curia, G., Cianchetti, C., Pasqualetti, M., Becchetti, A., Guerrini, R., Casari, G.
<strong>Increased sensitivity of the neuronal nicotinic receptor alpha-2 subunit causes familial epilepsy with nocturnal wandering and ictal fear.</strong>
Am. J. Hum. Genet. 79: 342-350, 2006.
[PubMed: 16826524]
[Full Text: https://doi.org/10.1086/506459]
</p>
</li>
<li>
<p class="mim-text-font">
Conti, V., Aracri, P., Chiti, L., Brusco, S., Mari, F., Marini, C., Albanese, M., Marchi, A., Liguori, C., Placidi, F., Romigi, A., Becchetti, A., Guerrini, R.
<strong>Nocturnal frontal lobe epilepsy with paroxysmal arousals due to CHRNA2 loss of function.</strong>
Neurology 84: 1520-1528, 2015.
[PubMed: 25770198]
[Full Text: https://doi.org/10.1212/WNL.0000000000001471]
</p>
</li>
<li>
<p class="mim-text-font">
Trivisano, M., Terracciano, A., Milano, T., Cappelletti, S., Pietrafusa, N., Bertini, E. S., Vigevano, F., Specchio, N.
<strong>Mutation of CHRNA2 in a family with benign familial infantile seizures: potential role of nicotinic acetylcholine receptor in various phenotypes of epilepsy.</strong>
Epilepsia 56: e53-e57, 2015.
[PubMed: 25847220]
[Full Text: https://doi.org/10.1111/epi.12967]
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Contributors:
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Cassandra L. Kniffin - updated : 04/18/2018
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Cassandra L. Kniffin : 8/24/2006
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alopez : 04/19/2018<br>ckniffin : 04/18/2018<br>carol : 01/08/2013<br>wwang : 8/28/2006<br>ckniffin : 8/24/2006
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NOTE: OMIM is intended for use primarily by physicians and other professionals concerned with genetic disorders, by genetics researchers,
and by advanced students in science and medicine. While the OMIM database is open to the public, users seeking information about a personal
medical or genetic condition are urged to consult with a qualified physician for diagnosis and for answers to personal questions.
<br />
OMIM<sup>&reg;</sup> and Online Mendelian Inheritance in Man<sup>&reg;</sup> are registered trademarks of the Johns Hopkins University.
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Copyright<sup>&reg;</sup> 1966-2025 Johns Hopkins University.
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