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<meta name="keywords" content="C4225374, chrnb1, cms iia, cms2a, congenital myasthenic syndrome 2a, congenital myasthenic syndrome 2a slow-channel, congenital myasthenic syndrome type 2a, disease or syndrome, myasthenic syndrome, congenital, 2a, slow-channel, myasthenic syndrome, congenital, postsynaptic slow-channel, myasthenic syndrome, congenital, slow-channel, myasthenic syndrome, congenital, type iia, sccms, slow channel congenital myasthenic syndrome, autosomal dominant, autosomal recessive, birth defects, chromosomal disease, chromosome, clinical features, clinical findings, clinical genetics, clinical recommendations, clinvar, congenital chromosomal disease, consumer genetic resources, cytogenetic location, disease characteristics, disease definitions, disease descriptions, disease ontology, disease synonyms, disease vocabulary, dysmorphology, entrez, familial disease, gene, gene-disease relationship, genereviews, genetic disease, genetic disorder, genetic terminology, genetic testing registry, genetics home reference, genomic disease, gtr, hereditary disease, heritable disease, hpo, human phenotype ontology, inherited disease, management guidelines, maternal inheritance, medgen, medical genetics, medical subject headings, mesh, mitochondrial inheritance, mode of inheritance, national center for biotechnology information, national institutes of health, national library of medicine, ncbi, nih, nlm, omim, ordo, orphanet, paternal inheritance, phenome, position statements, professional practice guidelines, rare disease, reference sequence, refseq, snomed ct, syndrome, undiagnosed diseases, x-linked recessive" /><meta name="description" content="Slow-channel congenital myasthenic syndrome (SCCMS) is a disorder of the postsynaptic neuromuscular junction (NMJ) characterized by early-onset progressive muscle weakness. The disorder results from kinetic abnormalities of the acetylcholine receptor channel, specifically from prolonged opening and activity of the channel, which causes prolonged synaptic currents resulting in a depolarization block. This is associated with calcium overload, which may contribute to subsequent degeneration of the endplate and postsynaptic membrane. Treatment with quinine, quinidine, or fluoxetine may be helpful; cholinesterase inhibitors and amifampridine should be avoided (summary by Engel et al., 2015). For a discussion of genetic heterogeneity of CMS, see CMS1A (601462)." /><meta name="robots" content="index,nofollow,noarchive" />
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<!--
|
||
UID=908185
|
||
ConceptID=C4225374
|
||
-->
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<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">Congenital myasthenic syndrome 2A<span class="h1sub">(CMS2A)</span></div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>908185</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information."><span class="highlight" style="background-color:">C4225374</span></a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div><table class="medgenTable"><tbody><tr><td>Synonym:</td>
|
||
<td>Myasthenic syndrome, congenital, 2a, slow-channel</td></tr>
|
||
<tr><td colspan="2" class="small"> </td></tr><tr><td><a class="help jig-ncbi-popper" data-jig="ncbipopper" href="#target-gene-loc">Gene (location):<img class="pulldown" src="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/img/4204968" /></a><div class="display-none" id="target-gene-loc">
|
||
Gene(s) directly associated with<br />
|
||
this condition or phenotype.</div></td>
|
||
<td><a target="_blank" title="CHRNB1 - ID: 1140 - NCBI Gene" href="/gene/1140" class="medgenPMinfo">CHRNB1</a> (17p13.1)</td></tr>
|
||
<tr><td colspan="2" class="small"> </td></tr><tr><td>Monarch Initiative:</td>
|
||
<td><a href="https://monarchinitiative.org/disease/MONDO:0014581" target="_blank">MONDO:0014581</a></td></tr>
|
||
<tr><td>OMIM<span class="superscript">®</span>:</td>
|
||
<td><a href="https://omim.org/entry/616313" target="_blank">616313</a></td></tr>
|
||
</tbody></table></div><div class="rprt-body jig-ncbiinpagenav" data-jigconfig="smoothScroll: false, gotoTopLink: true, gotoTopLinkText: '', gotoTopLinkAttrs: {'title': 'Go to the top of the page'},allHeadingLevels: ['h1'], topOfPageTOC: true, tocId: 'my-toc'"><div id="rprt-tabs-1" class="rprt-tab"><div id="tb-termsProp-1"><div class="leftCol mgCol"><div>
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<div class="portlet mgSection" id="ID_100">
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||
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Definition">Definition</h1><a sid="100" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln">Slow-channel congenital myasthenic syndrome (SCCMS) is a disorder of the postsynaptic neuromuscular junction (NMJ) characterized by early-onset progressive muscle weakness. The disorder results from kinetic abnormalities of the acetylcholine receptor channel, specifically from prolonged opening and activity of the channel, which causes prolonged synaptic currents resulting in a depolarization block. This is associated with calcium overload, which may contribute to subsequent degeneration of the endplate and postsynaptic membrane. Treatment with quinine, quinidine, or fluoxetine may be helpful; cholinesterase inhibitors and amifampridine should be avoided (summary by Engel et al., 2015). For a discussion of genetic heterogeneity of CMS, see CMS1A (601462). [from <a title="Online Mendelian Inheritance in Man" href="http://www.omim.org" class="defSource" target="_blank">OMIM</a>]</div>
|
||
</div>
|
||
|
||
<div class="portlet mgSection" id="ID_117">
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||
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Additional_description">Additional description</h1><a sid="117" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln"><div class="mgSection"><strong>From MedlinePlus Genetics</strong><br />Some individuals have episodes of breathing problems that may be triggered by fevers or infection. Severely affected individuals may also experience short pauses in breathing (apnea) that can lead to a bluish appearance of the skin or lips (cyanosis).<br /><br />Congenital myasthenic syndrome is a group of conditions characterized by muscle weakness (myasthenia) that worsens with physical exertion. The muscle weakness typically begins in early childhood but can also appear in adolescence or adulthood. Facial muscles, including muscles that control the eyelids, muscles that move the eyes, and muscles used for chewing and swallowing, are most commonly affected. However, any of the muscles used for movement (skeletal muscles) can be affected in this condition. Due to muscle weakness, affected infants may have feeding difficulties. Development of motor skills such as crawling or walking may be delayed. The severity of the myasthenia varies greatly, with some people experiencing minor weakness and others having such severe weakness that they are unable to walk. <a target="_blank" href="https://medlineplus.gov/genetics/condition/congenital-myasthenic-syndrome">https://medlineplus.gov/genetics/condition/congenital-myasthenic-syndrome</a></div></div>
|
||
</div>
|
||
|
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<div class="portlet mgSection" id="ID_102">
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<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Clinical_features">Clinical features</h1><a sid="102" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln clinfeat"><strong>From HPO</strong><br />
|
||
<div class="divPopper rprt" id="clin_98042"><div><strong>Knee flexion contracture</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>98042</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0409355</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">A type of knee joint contracture in which the knee is in a fixed bent (flexed) configuration such that it cannot be straightened actively or passively.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/98042">Feature record</a> | <a href="/medgen?term=%22Knee%20flexion%20contracture%22%5BClinical%20Features%5D%20OR%2098042%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_107956"><div><strong>Limb muscle weakness</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>107956</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0587246</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Reduced strength and weakness of the muscles of the arms and legs.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/107956">Feature record</a> | <a href="/medgen?term=%22Limb%20muscle%20weakness%22%5BClinical%20Features%5D%20OR%20107956%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_324693"><div><strong>Poor suck</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>324693</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C1837142</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">An inadequate sucking reflex, resulting in the difficult of newborns to be breast-fed.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/324693">Feature record</a> | <a href="/medgen?term=%22Poor%20suck%22%5BClinical%20Features%5D%20OR%20324693%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_66836"><div><strong>Abnormally high-pitched voice</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>66836</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0241703</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">A persistent (minutes to hours) abnormal increase in the pitch (frequency) of the voice for the context or social situation or significantly different from baseline of the individual.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/66836">Feature record</a> | <a href="/medgen?term=%22Abnormally%20high-pitched%20voice%22%5BClinical%20Features%5D%20OR%2066836%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_66034"><div><strong>Delayed ability to walk</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>66034</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0241726</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">A failure to achieve the ability to walk at an appropriate developmental stage. Most children learn to walk in a series of stages, and learn to walk short distances independently between 12 and 15 months.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/66034">Feature record</a> | <a href="/medgen?term=%22Delayed%20ability%20to%20walk%22%5BClinical%20Features%5D%20OR%2066034%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_451076"><div><strong>Fatigable weakness</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>451076</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0947912</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
|
||
<div class="spaceAbove">A type of weakness that occurs after a muscle group is used and lessens if the muscle group has some rest. That is, there is diminution of strength with repetitive muscle actions.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/451076">Feature record</a> | <a href="/medgen?term=%22Fatigable%20weakness%22%5BClinical%20Features%5D%20OR%20451076%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_373253"><div><strong>Easy fatigability</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>373253</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C1837098</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Increased susceptibility to fatigue.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/373253">Feature record</a> | <a href="/medgen?term=%22Easy%20fatigability%22%5BClinical%20Features%5D%20OR%20373253%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_1368737"><div><strong>Delayed ability to sit</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1368737</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C4476710</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">A failure to achieve the ability to sit at an appropriate developmental stage. Most children sit with support at 6 months of age and sit steadily without support at 9 months of age.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/1368737">Feature record</a> | <a href="/medgen?term=%22Delayed%20ability%20to%20sit%22%5BClinical%20Features%5D%20OR%201368737%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_10133"><div><strong>Hypotonia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>10133</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0026827</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/10133">Feature record</a> | <a href="/medgen?term=%22Hypotonia%22%5BClinical%20Features%5D%20OR%2010133%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_10135"><div><strong>Myopathy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>10135</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0026848</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
|
||
<div class="spaceAbove">A disorder of muscle unrelated to impairment of innervation or neuromuscular junction.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/10135">Feature record</a> | <a href="/medgen?term=%22Myopathy%22%5BClinical%20Features%5D%20OR%2010135%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_83069"><div><strong>Flexion contracture</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>83069</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0333068</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Anatomical Abnormality</dd></dl></div></div></div>
|
||
<div class="spaceAbove">A flexion contracture is a bent (flexed) joint that cannot be straightened actively or passively. It is thus a chronic loss of joint motion due to structural changes in muscle, tendons, ligaments, or skin that prevents normal movement of joints.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/83069">Feature record</a> | <a href="/medgen?term=%22Flexion%20contracture%22%5BClinical%20Features%5D%20OR%2083069%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_87660"><div><strong>Facial palsy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>87660</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0376175</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Facial nerve palsy is a dysfunction of cranial nerve VII (the facial nerve) that results in inability to control facial muscles on the affected side with weakness of the muscles of facial expression and eye closure. This can either be present in unilateral or bilateral form.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/87660">Feature record</a> | <a href="/medgen?term=%22Facial%20palsy%22%5BClinical%20Features%5D%20OR%2087660%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_892680"><div><strong>Muscular atrophy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>892680</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0541794</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Pathologic Function</dd></dl></div></div></div>
|
||
<div class="spaceAbove">The presence of skeletal muscular atrophy (which is also known as amyotrophy).</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/892680">Feature record</a> | <a href="/medgen?term=%22Muscular%20atrophy%22%5BClinical%20Features%5D%20OR%20892680%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_322809"><div><strong>Poor head control</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>322809</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C1836038</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Difficulty to maintain correct position of the head while standing or sitting. Infant head lag is observed when the head seems to flop around or lags posteriorly behind the trunk. Several articles have maintained that head lag should be absent by age 3 to 4 months.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/322809">Feature record</a> | <a href="/medgen?term=%22Poor%20head%20control%22%5BClinical%20Features%5D%20OR%20322809%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_322813"><div><strong>Muscle fiber splitting</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>322813</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C1836057</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Fiber splitting or branching is a common finding in human and rat skeletal muscle pathology. Fiber splitting refers to longitudinal halving of the complete fiber, while branching originates from a regenerating end of a necrotic fiber as invaginations of the sarcolemma. In fiber branching, one end of the fiber remains intact as a single entity, while the other end has several branches.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/322813">Feature record</a> | <a href="/medgen?term=%22Muscle%20fiber%20splitting%22%5BClinical%20Features%5D%20OR%20322813%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_336019"><div><strong>Increased variability in muscle fiber diameter</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>336019</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C1843700</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">An abnormally high degree of muscle fiber size variation. This phenotypic feature can be observed upon muscle biopsy.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/336019">Feature record</a> | <a href="/medgen?term=%22Increased%20variability%20in%20muscle%20fiber%20diameter%22%5BClinical%20Features%5D%20OR%20336019%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_344274"><div><strong>Type 1 muscle fiber predominance</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>344274</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C1854387</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">An abnormal predominance of type I muscle fibers (in general, this feature can only be observed on muscle biopsy).</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/344274">Feature record</a> | <a href="/medgen?term=%22Type%201%20muscle%20fiber%20predominance%22%5BClinical%20Features%5D%20OR%20344274%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_412209"><div><strong>Neonatal hypotonia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>412209</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C2267233</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Muscular hypotonia (abnormally low muscle tone) manifesting in the neonatal period.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/412209">Feature record</a> | <a href="/medgen?term=%22Neonatal%20hypotonia%22%5BClinical%20Features%5D%20OR%20412209%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_892749"><div><strong>EMG: decremental response of compound muscle action potential to repetitive nerve stimulation</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>892749</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C4021728</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">A compound muscle action potential (CMAP) is a type of electromyography (EMG). CMAP refers to a group of almost simultaneous action potentials from several muscle fibers in the same area evoked by stimulation of the supplying motor nerve and are recorded as one multipeaked summated action potential. This abnormality refers to a greater than normal decrease in the amplitude during the course of the investigation.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/892749">Feature record</a> | <a href="/medgen?term=%22EMG%3A%20decremental%20response%20of%20compound%20muscle%20action%20potential%20to%20repetitive%20nerve%20stimulation%22%5BClinical%20Features%5D%20OR%20892749%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_1055518"><div><strong>Anti-neuromuscular Junction acetylcholine receptor antibody positivity</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1055518</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier assigned by MedGen (starting with CN) for terms that cannot be identified in NLM's Unified Medical Language system (UMLS) Click for more information.">CN378840</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">The presence of autoantibodies (immunoglobulins) in the blood circulation that react against neuromuscular junction acetylcholine receptors.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/1055518">Feature record</a> | <a href="/medgen?term=%22Anti-neuromuscular%20Junction%20acetylcholine%20receptor%20antibody%20positivity%22%5BClinical%20Features%5D%20OR%201055518%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_66814"><div><strong>High palate</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>66814</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0240635</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Height of the palate more than 2 SD above the mean (objective) or palatal height at the level of the first permanent molar more than twice the height of the teeth (subjective).</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/66814">Feature record</a> | <a href="/medgen?term=%22High%20palate%22%5BClinical%20Features%5D%20OR%2066814%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_324419"><div><strong>Long face</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>324419</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C1836047</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Facial height (length) is more than 2 standard deviations above the mean (objective); or, an apparent increase in the height (length) of the face (subjective).</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/324419">Feature record</a> | <a href="/medgen?term=%22Long%20face%22%5BClinical%20Features%5D%20OR%20324419%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_373334"><div><strong>Narrow face</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>373334</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C1837463</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Finding</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Bizygomatic (upper face) and bigonial (lower face) width are both more than 2 standard deviations below the mean (objective); or, an apparent reduction in the width of the upper and lower face (subjective).</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/373334">Feature record</a> | <a href="/medgen?term=%22Narrow%20face%22%5BClinical%20Features%5D%20OR%20373334%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_2287"><div><strong>Ptosis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>2287</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0005745</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
|
||
<div class="spaceAbove">The upper eyelid margin is positioned 3 mm or more lower than usual and covers the superior portion of the iris (objective); or, the upper lid margin obscures at least part of the pupil (subjective).</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/2287">Feature record</a> | <a href="/medgen?term=%22Ptosis%22%5BClinical%20Features%5D%20OR%202287%5Buid%5D">Search on this feature</a></div></div>
|
||
<div class="divPopper rprt" id="clin_45205"><div><strong>Ophthalmoplegia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>45205</dd><dt><span class="dotprefix"> •</span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS) Click for more information.">C0029089</a></dd><dt><span class="dotprefix"> •</span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
|
||
<div class="spaceAbove">Paralysis of one or more extraocular muscles that are responsible for eye movements.</div>
|
||
<div class="spaceAbove nowrap">See: <a href="/medgen/45205">Feature record</a> | <a href="/medgen?term=%22Ophthalmoplegia%22%5BClinical%20Features%5D%20OR%2045205%5Buid%5D">Search on this feature</a></div></div><div class="TreeLite" data-jigconfig="closed: 1"><div class="concept-def"><a class="small" href="#" onclick="jQuery(".TreeLite","#ID_102").TreeLite().openAll(); return false;">Show all</a><a class="small" href="#" onclick="jQuery(".TreeLite","#ID_102").TreeLite().closeAll(); return false;">Hide all</a></div><ul><li><span class="TLline">Abnormality of head or neck</span><ul><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_66814" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">High palate</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_324419" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Long face</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_373334" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Narrow face</a></span></li></ul></li><li><span class="TLline">Abnormality of limbs</span><ul><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_98042" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Knee flexion contracture</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_107956" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Limb muscle weakness</a></span></li></ul></li><li><span class="TLline">Abnormality of the digestive system</span><ul><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_324693" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Poor suck</a></span></li></ul></li><li><span class="TLline">Abnormality of the eye</span><ul><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_45205" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Ophthalmoplegia</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_2287" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Ptosis</a></span></li></ul></li><li><span class="TLline">Abnormality of the immune system</span><ul><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1055518" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Anti-neuromuscular Junction acetylcholine receptor antibody positivity</a></span></li></ul></li><li><span class="TLline">Abnormality of the musculoskeletal system</span><ul><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_892749" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">EMG: decremental response of compound muscle action potential to repetitive nerve stimulation</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_87660" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Facial palsy</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_83069" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Flexion contracture</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_10133" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hypotonia</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_336019" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Increased variability in muscle fiber diameter</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_322813" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Muscle fiber splitting</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_892680" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Muscular atrophy</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_10135" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Myopathy</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_412209" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neonatal hypotonia</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_322809" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Poor head control</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_344274" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Type 1 muscle fiber predominance</a></span></li></ul></li><li><span class="TLline">Abnormality of the nervous system</span><ul><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_66836" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Abnormally high-pitched voice</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1368737" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Delayed ability to sit</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_66034" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Delayed ability to walk</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_373253" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Easy fatigability</a></span></li><li class="TLline">
|
||
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_451076" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Fatigable weakness</a></span></li></ul></li></ul></div></div>
|
||
</div>
|
||
<div class="display-none help-popup" id="guidelinesHelpPM">These guidelines are articles in PubMed that match specific search criteria developed by MedGen to capture the most relevant practice guidelines. This list may not be comprehensive and may include broader topics as well. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div><div class="display-none help-popup" id="guidelinesHelpCurated">These guidelines are manually curated by the MedGen team
|
||
to supplement articles available in PubMed. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div>
|
||
<div class="portlet mgSection" id="ID_103">
|
||
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Recent_clinical_studies">Recent clinical studies</h1><a sid="103" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln"><h3 class="subhead">Etiology</h3>
|
||
<div class="nl"><a target="_blank" href="/pubmed/32727330">Pharmacological Strategy for Congenital Myasthenic Syndrome with CHRNE Mutations: A Meta-Analysis of Case Reports.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Huang K,
|
||
Luo YB,
|
||
Bi FF,
|
||
Yang H</span><br />
|
||
<span class="medgenPMjournal">Curr Neuropharmacol</span>
|
||
2021;19(5):718-729.
|
||
doi: 10.2174/1570159X18666200729092332.
|
||
<span class="bold">PMID: </span><a href="/pubmed/32727330" target="_blank">32727330</a><a href="/pmc/articles/PMC8573743" target="_blank" class="PubMedFree">Free PMC Article</a></div>
|
||
|
||
<div class="nl"><a target="_blank" href="/pubmed/26501342">Global N-linked Glycosylation is Not Significantly Impaired in Myoblasts in Congenital Myasthenic Syndromes Caused by Defective Glutamine-Fructose-6-Phosphate Transaminase 1 (GFPT1).</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Chen Q,
|
||
Müller JS,
|
||
Pang PC,
|
||
Laval SH,
|
||
Haslam SM,
|
||
Lochmüller H,
|
||
Dell A</span><br />
|
||
<span class="medgenPMjournal">Biomolecules</span>
|
||
2015 Oct 16;5(4):2758-81.
|
||
doi: 10.3390/biom5042758.
|
||
<span class="bold">PMID: </span><a href="/pubmed/26501342" target="_blank">26501342</a><a href="/pmc/articles/PMC4693256" target="_blank" class="PubMedFree">Free PMC Article</a></div>
|
||
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Congenital%20myasthenic%20syndrome%202A%22%20AND%20Etiology%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (2)</a></div><h3 class="subhead">Diagnosis</h3>
|
||
<div class="nl"><a target="_blank" href="/pubmed/38566418">The severity of MUSK pathogenic variants is predicted by the protein domain they disrupt.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Cocanougher BT,
|
||
Liu SW,
|
||
Francescatto L,
|
||
Behura A,
|
||
Anneling M,
|
||
Jackson DG,
|
||
Deak KL,
|
||
Hornik CD,
|
||
ElMallah MK,
|
||
Pizoli CE,
|
||
Smith EC,
|
||
Tan KGQ,
|
||
McDonald MT</span><br />
|
||
<span class="medgenPMjournal">HGG Adv</span>
|
||
2024 Jul 18;5(3):100288.
|
||
Epub 2024 Apr 1
|
||
doi: 10.1016/j.xhgg.2024.100288.
|
||
<span class="bold">PMID: </span><a href="/pubmed/38566418" target="_blank">38566418</a><a href="/pmc/articles/PMC11070630" target="_blank" class="PubMedFree">Free PMC Article</a></div>
|
||
|
||
<div class="nl"><a target="_blank" href="/pubmed/37646703">Delineation of molecular characteristics of congenital myasthenic syndromes in Indian families and review of literature.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Mishra S,
|
||
Nair KV,
|
||
Shukla A</span><br />
|
||
<span class="medgenPMjournal">Clin Dysmorphol</span>
|
||
2023 Oct 1;32(4):162-167.
|
||
Epub 2023 Jun 19
|
||
doi: 10.1097/MCD.0000000000000465.
|
||
<span class="bold">PMID: </span><a href="/pubmed/37646703" target="_blank">37646703</a></div>
|
||
|
||
<div class="nl"><a target="_blank" href="/pubmed/26501342">Global N-linked Glycosylation is Not Significantly Impaired in Myoblasts in Congenital Myasthenic Syndromes Caused by Defective Glutamine-Fructose-6-Phosphate Transaminase 1 (GFPT1).</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Chen Q,
|
||
Müller JS,
|
||
Pang PC,
|
||
Laval SH,
|
||
Haslam SM,
|
||
Lochmüller H,
|
||
Dell A</span><br />
|
||
<span class="medgenPMjournal">Biomolecules</span>
|
||
2015 Oct 16;5(4):2758-81.
|
||
doi: 10.3390/biom5042758.
|
||
<span class="bold">PMID: </span><a href="/pubmed/26501342" target="_blank">26501342</a><a href="/pmc/articles/PMC4693256" target="_blank" class="PubMedFree">Free PMC Article</a></div>
|
||
|
||
<div class="nl"><a target="_blank" href="/pubmed/6840138">Facilitating myasthenic syndrome and quadriceps myopathy.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Alberca R,
|
||
Gil-Peralta A,
|
||
Castilla JM,
|
||
Rafel E,
|
||
Bautista J</span><br />
|
||
<span class="medgenPMjournal">Eur Neurol</span>
|
||
1983;22(1):22-8.
|
||
doi: 10.1159/000115532.
|
||
<span class="bold">PMID: </span><a href="/pubmed/6840138" target="_blank">6840138</a></div>
|
||
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Congenital%20myasthenic%20syndrome%202A%22%20AND%20Diagnosis%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (4)</a></div><h3 class="subhead">Therapy</h3>
|
||
<div class="nl"><a target="_blank" href="/pubmed/15328566">Congenital myasthenic syndrome due to rapsyn deficiency: three cases with arthrogryposis and bulbar symptoms.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Ioos C,
|
||
Barois A,
|
||
Richard P,
|
||
Eymard B,
|
||
Hantaï D,
|
||
Estournet-Mathiaud B</span><br />
|
||
<span class="medgenPMjournal">Neuropediatrics</span>
|
||
2004 Aug;35(4):246-9.
|
||
doi: 10.1055/s-2004-820993.
|
||
<span class="bold">PMID: </span><a href="/pubmed/15328566" target="_blank">15328566</a></div>
|
||
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Congenital%20myasthenic%20syndrome%202A%22%20AND%20Therapy%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (1)</a></div><h3 class="subhead">Prognosis</h3>
|
||
<div class="nl"><a target="_blank" href="/pubmed/38566418">The severity of MUSK pathogenic variants is predicted by the protein domain they disrupt.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Cocanougher BT,
|
||
Liu SW,
|
||
Francescatto L,
|
||
Behura A,
|
||
Anneling M,
|
||
Jackson DG,
|
||
Deak KL,
|
||
Hornik CD,
|
||
ElMallah MK,
|
||
Pizoli CE,
|
||
Smith EC,
|
||
Tan KGQ,
|
||
McDonald MT</span><br />
|
||
<span class="medgenPMjournal">HGG Adv</span>
|
||
2024 Jul 18;5(3):100288.
|
||
Epub 2024 Apr 1
|
||
doi: 10.1016/j.xhgg.2024.100288.
|
||
<span class="bold">PMID: </span><a href="/pubmed/38566418" target="_blank">38566418</a><a href="/pmc/articles/PMC11070630" target="_blank" class="PubMedFree">Free PMC Article</a></div>
|
||
|
||
<div class="nl"><a target="_blank" href="/pubmed/11865139">Three novel COLQ mutations and variation of phenotypic expressivity due to G240X.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Shapira YA,
|
||
Sadeh ME,
|
||
Bergtraum MP,
|
||
Tsujino A,
|
||
Ohno K,
|
||
Shen XM,
|
||
Brengman J,
|
||
Edwardson S,
|
||
Matoth I,
|
||
Engel AG</span><br />
|
||
<span class="medgenPMjournal">Neurology</span>
|
||
2002 Feb 26;58(4):603-9.
|
||
doi: 10.1212/wnl.58.4.603.
|
||
<span class="bold">PMID: </span><a href="/pubmed/11865139" target="_blank">11865139</a></div>
|
||
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Congenital%20myasthenic%20syndrome%202A%22%20AND%20Prognosis%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (2)</a></div><h3 class="subhead">Clinical prediction guides</h3>
|
||
<div class="nl"><a target="_blank" href="/pubmed/38566418">The severity of MUSK pathogenic variants is predicted by the protein domain they disrupt.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Cocanougher BT,
|
||
Liu SW,
|
||
Francescatto L,
|
||
Behura A,
|
||
Anneling M,
|
||
Jackson DG,
|
||
Deak KL,
|
||
Hornik CD,
|
||
ElMallah MK,
|
||
Pizoli CE,
|
||
Smith EC,
|
||
Tan KGQ,
|
||
McDonald MT</span><br />
|
||
<span class="medgenPMjournal">HGG Adv</span>
|
||
2024 Jul 18;5(3):100288.
|
||
Epub 2024 Apr 1
|
||
doi: 10.1016/j.xhgg.2024.100288.
|
||
<span class="bold">PMID: </span><a href="/pubmed/38566418" target="_blank">38566418</a><a href="/pmc/articles/PMC11070630" target="_blank" class="PubMedFree">Free PMC Article</a></div>
|
||
|
||
<div class="nl"><a target="_blank" href="/pubmed/26501342">Global N-linked Glycosylation is Not Significantly Impaired in Myoblasts in Congenital Myasthenic Syndromes Caused by Defective Glutamine-Fructose-6-Phosphate Transaminase 1 (GFPT1).</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Chen Q,
|
||
Müller JS,
|
||
Pang PC,
|
||
Laval SH,
|
||
Haslam SM,
|
||
Lochmüller H,
|
||
Dell A</span><br />
|
||
<span class="medgenPMjournal">Biomolecules</span>
|
||
2015 Oct 16;5(4):2758-81.
|
||
doi: 10.3390/biom5042758.
|
||
<span class="bold">PMID: </span><a href="/pubmed/26501342" target="_blank">26501342</a><a href="/pmc/articles/PMC4693256" target="_blank" class="PubMedFree">Free PMC Article</a></div>
|
||
|
||
<div class="nl"><a target="_blank" href="/pubmed/11865139">Three novel COLQ mutations and variation of phenotypic expressivity due to G240X.</a></div>
|
||
<div class="portlet_content ln"><span class="medgenPMauthor">Shapira YA,
|
||
Sadeh ME,
|
||
Bergtraum MP,
|
||
Tsujino A,
|
||
Ohno K,
|
||
Shen XM,
|
||
Brengman J,
|
||
Edwardson S,
|
||
Matoth I,
|
||
Engel AG</span><br />
|
||
<span class="medgenPMjournal">Neurology</span>
|
||
2002 Feb 26;58(4):603-9.
|
||
doi: 10.1212/wnl.58.4.603.
|
||
<span class="bold">PMID: </span><a href="/pubmed/11865139" target="_blank">11865139</a></div>
|
||
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Congenital%20myasthenic%20syndrome%202A%22%20AND%20Clinical%20prediction%20guides%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (3)</a></div></div>
|
||
</div>
|
||
</div></div></div></div></div></div></div>
|
||
<div id="messagearea_bottom">
|
||
|
||
</div>
|
||
<div class=" bottom">
|
||
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
<div class="supplemental col three_col last">
|
||
<h2 class="offscreen_noflow">Supplemental Content</h2>
|
||
|
||
<div>
|
||
|
||
<!-- MedGen supplemental column starts here -->
|
||
<div class="rightCol mgCol">
|
||
<div class="portlet mgSection" id="ID_113">
|
||
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Table_of_contents">Table of contents</h1><a sid="113" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln"><ul id="my-toc"></ul></div>
|
||
</div>
|
||
|
||
<div class="portlet mgSection" id="ID_106">
|
||
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Genetic_Testing_Registry">Genetic Testing Registry</h1><a sid="106" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln"><ul><li><a href="/gtr/tests?term=C4225374%5bDISCUI%5d&filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (6)</a></li>
|
||
<li><a href="/gtr/tests?term=C4225374%5bDISCUI%5d&filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (12)</a></li>
|
||
<li><a href="/gtr/tests?term=C4225374%5bDISCUI%5d&filter=method%3A2%5F19" target="_blank">Targeted variant analysis (2)</a></li>
|
||
<li class="portletSeeAll portletSeeAllPad"><total><a href="/gtr/tests?term=C4225374%5bDISCUI%5d" target="_blank">See all (14)</a></total></li>
|
||
</ul></div>
|
||
</div>
|
||
|
||
<div class="portlet mgSection" id="ID_119">
|
||
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Clinical_resources">Clinical resources</h1><a sid="119" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln"><ul><li><a href="https://www.omim.org/search?index=entry&start=1&limit=10&sort=score%20desc&field=number&search=616313" target="_blank">OMIM</a></li><li><a href="https://clinicaltrials.gov/search?cond=Congenital%20myasthenic%20syndrome%202A" target="_blank">ClinicalTrials.gov</a></li></ul></div>
|
||
</div>
|
||
|
||
<div class="portlet mgSection" id="ID_115">
|
||
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Molecular_resources">Molecular resources</h1><a sid="115" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln"><ul><li><a href="http://www.omim.org/search?index=entry&start=1&limit=10&sort=score%20desc&field=number&search=100710" target="_blank">OMIM</a></li><li><a href="/clinvar/?term=1140[geneid]" target="_blank">View CHRNB1 variations in ClinVar</a></li><li><a href="/nuccore/190358473" target="_blank">RefSeqGene</a></li><li><a href="https://catalog.coriell.org/Search?q=616313" target="_blank">Coriell Institute for Medical Research</a></li></ul></div>
|
||
</div>
|
||
|
||
<div class="portlet mgSection" id="ID_116">
|
||
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Consumer_resources">Consumer resources</h1><a sid="116" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
|
||
<div class="portlet_content ln"><ul><li><a href="https://www.malacards.org/card/myasthenic_syndrome_congenital_2a_slow_channel" target="_blank">MalaCards</a></li><li><a href="https://vsearch.nlm.nih.gov/vivisimo/cgi-bin/query-meta?v:project=medlineplus&query=Congenital%20myasthenic%20syndrome%202A" target="_blank">MedlinePlus</a></li><li><a href="https://medlineplus.gov/genetics/condition/congenital-myasthenic-syndrome" target="_blank">MedlinePlusGenetics (GHR)</a></li><li><a href="https://rarediseases.info.nih.gov/diseases/9895/disease" target="_blank">NCATS Office of Rare Diseases Research (GARD)</a></li></ul></div>
|
||
</div>
|
||
</div>
|
||
<div class="portlet brieflink">
|
||
<div class="portlet_head">
|
||
<div class="portlet_title">
|
||
<h3>Reviews</h3>
|
||
</div>
|
||
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews.Shutter" sid="1" href="#" class="portlet_shutter" title="Show/hide content" remembercollapsed="true" pgsec_name="Reviews" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews.Shutter"></a>
|
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</div>
|
||
<div class="portlet_content">
|
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<ul>
|
||
<li>
|
||
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