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<meta name="keywords" content="C4722277, chn2, disease or syndrome, hypomyelinating neuropathy, congenital, 2, mpz, neuropathy, congenital hypomyelinating, 2, 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="Congenital hypomyelinating neuropathy-2 is an autosomal dominant neurologic disorder characterized by early-onset hypotonia, severely delayed motor development, muscle weakness with areflexia, and severely decreased nerve conduction velocities (NCV) resulting from improper myelination of axons. The severity is variable: some patients may present at birth with contractures and respiratory insufficiency, whereas others may achieve walking (summary by Warner et al., 1996).&#13; CHN shows significant phenotypic overlap with Dejerine-Sottas syndrome (DSS; 145900), which is also a neuropathy with early onset. Some classify the disorders differently, noting that CHN is characterized by hypo- or amyelination resulting from a congenital defect in myelin formation, whereas DSS has features of continuous myelin breakdown, with demyelination and remyelination (summary by Smit et al., 2008).&#13; For a discussion of genetic heterogeneity of CHN, see CHN1 (605253)." /><meta name="robots" content="index,nofollow,noarchive" />
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<!--
UID=1648446
ConceptID=C4722277
-->
<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">Neuropathy, congenital hypomyelinating, 2<span class="h1sub">(CHN2)</span></div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648446</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)&#10;Click for more information."><span class="highlight" style="background-color:">C4722277</span></a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div><table class="medgenTable"><tbody><tr><td>Synonyms:</td>
<td>CHN2; NEUROPATHY, CONGENITAL HYPOMYELINATING, 2</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="MPZ - ID: 4359 - NCBI Gene" href="/gene/4359" class="medgenPMinfo">MPZ</a> (1q23.3)</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td>Monarch Initiative:</td>
<td><a href="https://monarchinitiative.org/disease/MONDO:0020765" target="_blank">MONDO:0020765</a></td></tr>
<tr><td>OMIM<span class="superscript">®</span>:</td>
<td><a href="https://omim.org/entry/618184" target="_blank">618184</a></td></tr>
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<div class="portlet mgSection" id="ID_100">
<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">Congenital hypomyelinating neuropathy-2 is an autosomal dominant neurologic disorder characterized by early-onset hypotonia, severely delayed motor development, muscle weakness with areflexia, and severely decreased nerve conduction velocities (NCV) resulting from improper myelination of axons. The severity is variable: some patients may present at birth with contractures and respiratory insufficiency, whereas others may achieve walking (summary by Warner et al., 1996).&#13; CHN shows significant phenotypic overlap with Dejerine-Sottas syndrome (DSS; 145900), which is also a neuropathy with early onset. Some classify the disorders differently, noting that CHN is characterized by hypo- or amyelination resulting from a congenital defect in myelin formation, whereas DSS has features of continuous myelin breakdown, with demyelination and remyelination (summary by Smit et al., 2008).&#13; For a discussion of genetic heterogeneity of CHN, see CHN1 (605253). [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_102">
<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_42034"><div><strong>Pes planus</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>42034</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)&#10;Click for more information.">C0016202</a></dd><dt><span class="dotprefix"></span></dt><dd>Anatomical Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">A foot where the longitudinal arch of the foot is in contact with the ground or floor when the individual is standing; or, in a patient lying supine, a foot where the arch is in contact with the surface of a flat board pressed against the sole of the foot by the examiner with a pressure similar to that expected from weight bearing; or, the height of the arch is reduced.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/42034">Feature record</a> | <a href="/medgen?term=%22Pes%20planus%22%5BClinical%20Features%5D%20OR%2042034%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_39223"><div><strong>Hypokinesia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>39223</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)&#10;Click for more information.">C0086439</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Abnormally diminished motor activity. In contrast to paralysis, hypokinesia is not characterized by a lack of motor strength, but rather by a poverty of movement. The typical habitual movements (e.g., folding the arms, crossing the legs) are reduced in frequency.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/39223">Feature record</a> | <a href="/medgen?term=%22Hypokinesia%22%5BClinical%20Features%5D%20OR%2039223%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_115943"><div><strong>Areflexia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>115943</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)&#10;Click for more information.">C0234146</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Absence of neurologic reflexes such as the knee-jerk reaction.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/115943">Feature record</a> | <a href="/medgen?term=%22Areflexia%22%5BClinical%20Features%5D%20OR%20115943%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_66020"><div><strong>Sensory ataxia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>66020</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)&#10;Click for more information.">C0240991</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">Incoordination of movement caused by a deficit in the sensory nervous system. Sensory ataxia can be distinguished from cerebellar ataxia by asking the patient to close his or her eyes. Persons with cerebellar ataxia show only a minimal worsening of symptoms, whereas persons with sensory ataxia show a marked worsening of symptoms.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/66020">Feature record</a> | <a href="/medgen?term=%22Sensory%20ataxia%22%5BClinical%20Features%5D%20OR%2066020%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)&#10;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_107860"><div><strong>Inability to walk</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>107860</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)&#10;Click for more information.">C0560046</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Incapability to ambulate.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/107860">Feature record</a> | <a href="/medgen?term=%22Inability%20to%20walk%22%5BClinical%20Features%5D%20OR%20107860%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_195967"><div><strong>Hyporeflexia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>195967</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)&#10;Click for more information.">C0700078</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Reduction of neurologic reflexes such as the knee-jerk reaction.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/195967">Feature record</a> | <a href="/medgen?term=%22Hyporeflexia%22%5BClinical%20Features%5D%20OR%20195967%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_256151"><div><strong>Persistent head lag</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>256151</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)&#10;Click for more information.">C1141883</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">The Premie-Neuro and the Dubowitz Neurological Examination score head lag in the same manner. Scoring for both is as follows</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/256151">Feature record</a> | <a href="/medgen?term=%22Persistent%20head%20lag%22%5BClinical%20Features%5D%20OR%20256151%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_376237"><div><strong>Onion bulb formation</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>376237</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)&#10;Click for more information.">C1847906</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Repeated episodes of segmental demyelination and remyelination lead to the accumulation of supernumerary Schwann cells around axons, which is referred to as onion bulb formation. This finding affects peripheral nerves.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/376237">Feature record</a> | <a href="/medgen?term=%22Onion%20bulb%20formation%22%5BClinical%20Features%5D%20OR%20376237%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_381392"><div><strong>Motor delay</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>381392</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)&#10;Click for more information.">C1854301</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A type of Developmental delay characterized by a delay in acquiring motor skills.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/381392">Feature record</a> | <a href="/medgen?term=%22Motor%20delay%22%5BClinical%20Features%5D%20OR%20381392%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_346872"><div><strong>Decreased number of peripheral myelinated nerve fibers</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>346872</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)&#10;Click for more information.">C1858285</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A loss of myelinated nerve fibers in the peripheral nervous system (in general, this finding can be observed on nerve biopsy).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/346872">Feature record</a> | <a href="/medgen?term=%22Decreased%20number%20of%20peripheral%20myelinated%20nerve%20fibers%22%5BClinical%20Features%5D%20OR%20346872%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_388130"><div><strong>Decreased motor nerve conduction velocity</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>388130</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)&#10;Click for more information.">C1858729</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A type of decreased nerve conduction velocity that affects the motor neuron.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/388130">Feature record</a> | <a href="/medgen?term=%22Decreased%20motor%20nerve%20conduction%20velocity%22%5BClinical%20Features%5D%20OR%20388130%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1370611"><div><strong>Delayed ability to stand</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1370611</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)&#10;Click for more information.">C4476709</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 stand up at an appropriate developmental stage. Most children begin to walk alone at 11 to 15 months of age. On average, children can stand while holding on at the age of 9 to 10 months, can pull up to stand and walk with one hand being held at 12 months, and can stand alone and walk well at 18 months.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1370611">Feature record</a> | <a href="/medgen?term=%22Delayed%20ability%20to%20stand%22%5BClinical%20Features%5D%20OR%201370611%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)&#10;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_11348"><div><strong>Scoliosis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>11348</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)&#10;Click for more information.">C0036439</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The presence of an abnormal lateral curvature of the spine.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/11348">Feature record</a> | <a href="/medgen?term=%22Scoliosis%22%5BClinical%20Features%5D%20OR%2011348%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_57735"><div><strong>Muscle weakness</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>57735</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)&#10;Click for more information.">C0151786</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Reduced strength of muscles.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/57735">Feature record</a> | <a href="/medgen?term=%22Muscle%20weakness%22%5BClinical%20Features%5D%20OR%2057735%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)&#10;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_322796"><div><strong>Facial diplegia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>322796</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)&#10;Click for more information.">C1836003</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Facial diplegia refers to bilateral facial palsy (bilateral facial palsy is much rarer than unilateral facial palsy).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/322796">Feature record</a> | <a href="/medgen?term=%22Facial%20diplegia%22%5BClinical%20Features%5D%20OR%20322796%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)&#10;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_326544"><div><strong>Severe muscular hypotonia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>326544</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)&#10;Click for more information.">C1839630</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A severe degree of muscular hypotonia characterized by markedly reduced muscle tone.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/326544">Feature record</a> | <a href="/medgen?term=%22Severe%20muscular%20hypotonia%22%5BClinical%20Features%5D%20OR%20326544%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_338530"><div><strong>Distal amyotrophy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>338530</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)&#10;Click for more information.">C1848736</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Muscular atrophy affecting muscles in the distal portions of the extremities.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/338530">Feature record</a> | <a href="/medgen?term=%22Distal%20amyotrophy%22%5BClinical%20Features%5D%20OR%20338530%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_812797"><div><strong>Respiratory insufficiency due to muscle weakness</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>812797</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)&#10;Click for more information.">C3806467</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/812797">Feature record</a> | <a href="/medgen?term=%22Respiratory%20insufficiency%20due%20to%20muscle%20weakness%22%5BClinical%20Features%5D%20OR%20812797%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_68618"><div><strong>Decreased fetal movement</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>68618</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)&#10;Click for more information.">C0235659</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">An abnormal reduction in quantity or strength of fetal movements.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/68618">Feature record</a> | <a href="/medgen?term=%22Decreased%20fetal%20movement%22%5BClinical%20Features%5D%20OR%2068618%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(&quot;.TreeLite&quot;,&quot;#ID_102&quot;).TreeLite().openAll(); return false;">Show all</a><a class="small" href="#" onclick="jQuery(&quot;.TreeLite&quot;,&quot;#ID_102&quot;).TreeLite().closeAll(); return false;">Hide all</a></div><ul><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_42034" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Pes planus</a></span></li></ul></li><li><span class="TLline">Abnormality of prenatal development or birth</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_68618" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Decreased fetal movement</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_338530" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Distal amyotrophy</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_322796" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Facial diplegia</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_57735" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Muscle weakness</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_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_11348" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Scoliosis</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_326544" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Severe muscular hypotonia</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_115943" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Areflexia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_388130" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Decreased motor nerve conduction velocity</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_346872" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Decreased number of peripheral myelinated nerve fibers</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1370611" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Delayed ability to stand</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_39223" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hypokinesia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_195967" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hyporeflexia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_107860" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Inability to walk</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_381392" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Motor delay</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_376237" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Onion bulb formation</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_256151" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Persistent head lag</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_66020" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Sensory ataxia</a></span></li></ul></li><li><span class="TLline">Abnormality of the respiratory system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_812797" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Respiratory insufficiency due to muscle weakness</a></span></li></ul></li></ul></div></div>
</div>
<div class="portlet mgSection" id="ID_118">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Term_Hierarchy">Term Hierarchy</h1><a sid="118" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln HierarchyGTR"><div class="jig-ncbitabs"><ul><li><a href="#tabGTR">GTR</a></li><li><a href="#tabMGEN">MeSH</a></li></ul><div id="tabGTR"><div class="search_result"><div class="rprts"><div class="chiclet_legend"><span class="chiclet_list" style="position:static;"><span title="Clinical test" class="chiclet Ccolor round">C</span><span>Clinical test,  </span><span title="Research test" class="chiclet Rcolor round">R</span><span>Research test,  </span><span title="OMIM" class="chiclet Ocolor ">O</span><span>OMIM,  </span><span title="GeneReview" class="chiclet Gcolor">G</span><span><em>GeneReviews</em>,  </span><span title="ClinVar" class="chiclet Vcolor">V</span><span>ClinVar  </span></span></div><div id="hierarchy" class="margin_t1"><div class="ds_tree"><ul><li class="TLclosed"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C0393818[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=97965">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet unavailable" title="OMIM">O</span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=97965" ref="ncbi_uid=97965">V</a></span></span><span class="TLline"><a href="/medgen/97965" ref="tree=GTR&amp;ncbi_uid=97965&amp;link_uid=97965" title="View MedGen record for 'Congenital hypomyelinating neuropathy'">Congenital hypomyelinating neuropathy</a></span><ul><li class="TLclosed"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C4721436[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=1648303">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=1648303" target="_blank" href="/omim/129010">O</a></span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=1648303" ref="ncbi_uid=1648303">V</a></span></span><span class="TLline"><a href="/medgen/1648303" ref="tree=GTR&amp;ncbi_uid=1648303&amp;link_uid=1648303" title="View MedGen record for 'Charcot-Marie-Tooth disease type 4E'">Charcot-Marie-Tooth disease type 4E</a></span></li><li class="TLclosed"><span class="TLline"><a href="/medgen/940521" ref="tree=GTR&amp;ncbi_uid=940521&amp;link_uid=940521" title="View MedGen record for 'Congenital hypomyelinating neuropathy 1, autosomal dominant'">Congenital hypomyelinating neuropathy 1, autosomal dominant</a></span></li><li class="matched_ds"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C4722277[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=1648446">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=1648446" target="_blank" href="/omim/159440">O</a></span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=1648446" ref="ncbi_uid=1648446">V</a></span></span><span class="TLline">Neuropathy, congenital hypomyelinating, 2</span></li><li class="TLclosed"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C4748608[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=1648417">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=1648417" target="_blank" href="/omim/602346">O</a></span><span class="chiclet unavailable" title="GeneReviews">G</span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=1648417" ref="ncbi_uid=1648417">V</a></span></span><span class="TLline"><a href="/medgen/1648417" ref="tree=GTR&amp;ncbi_uid=1648417&amp;link_uid=1648417" title="View MedGen record for 'Neuropathy, congenital hypomyelinating, 3'">Neuropathy, congenital hypomyelinating, 3</a></span></li></ul></li></ul></div></div></div></div></div><div id="tabMGEN"><div class="ds_tree"><ul><li><span class="TLline"><a href="/medgen/97965" ref="tree=MeSH" title="MedGen record for Congenital hypomyelinating neuropathy">Congenital hypomyelinating neuropathy</a></span><ul><li><span class="matched_ds">Neuropathy, congenital hypomyelinating, 2</span></li></ul></li></ul></div></div></div></div>
</div>
<div class="portlet mgSection" id="ID_105">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Professional_guidelines">Professional guidelines</h1><a sid="105" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><h3 class="subhead">PubMed<a class="help jig-ncbi-popper" data-jig="ncbipopper" href="#guidelinesHelpPM"><img class="pulldown" src="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/img/4204968" /></a></h3>
<div class="nl"><a target="_blank" href="/pubmed/12001651">Phenotype and genotype correlation in childhood spinal muscular atrophy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hausmanowa-Petrusewicz I</span><br />
<span class="medgenPMjournal">Neurol Neurochir Pol</span>
2001;35 Suppl 3:29-35.
<span class="bold">PMID: </span><a href="/pubmed/12001651" target="_blank">12001651</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(neuropathy%2C%20congenital%20hypomyelinating%2C%202)%20AND%20(%22english%20and%20humans%22%5BFilter%5D)%20AND%20(%20(%22practice%20guideline%22%5BFilter%5D)%20OR%20(practice*%5Btitl%5D%20AND%20(guideline%5Btitl%5D%20OR%20parameter%5Btitl%5D%20OR%20resource%5Btitl%5D%20OR%20bulletin%5Btitl%5D%20OR%20best%5Btitl%5D))%20OR%20(genetic*%5Btitl%5D%20AND%20(evaluation%5Btitl%5D%20OR%20counseling%5Btitl%5D%20OR%20screening%5Btitl%5D%20OR%20test*%5Btitl%5D))%20OR%20(clinical%5Btitl%5D%20AND%20((expert%5Btitl%5D%20AND%20consensus%5Btitl%5D)%20OR%20utility%5Btitl%5D%20OR%20guideline*%5Btitl%5D))%20OR%20(management%5Btitl%5D%20AND%20(clinical%5Btitl%5D%20OR%20diagnos*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20pain%5Btitl%5D%20OR%20surveillance%5Btitl%5D%20OR%20emergency%5Btitl%5D%20OR%20guideline*%5Btitl%5D%20OR%20therap*))%20OR%20(treatment%5Btitl%5D%20AND%20((evaluation%5Btitl%5D%20AND%20diagnosis%5Btitl%5D)%20OR%20(assessment%5Btitl%5D%20AND%20prevention%5Btitl%5D)%20OR%20therap*))%20OR%20(Diagnos*%5Btitl%5D%20AND%20(prenatal%5Btitl%5D%20OR%20treatment%5Btitl%5D%20OR%20follow-up%5Btitl%5D%20OR%20statement%5Btitl%5D%20OR%20criteria%5Btitl%5D%20OR%20newborn%5Btitl%5D%20OR%20differential%5Btitl%5D%20OR%20neonatal%5Btitl%5D%20OR%20neonate%5Btitl%5D))%20OR%20(guideline*%5Btitl%5D%20AND%20(pharmacogenetic*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20evidence-based%5Btitl%5D%20OR%20consensus%5Btitl%5D%20OR%20(technical%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20(molecular%5Btitl%5D%20AND%20testing%5Btitl%5D)))%20OR%20(risk%5Btitl%5D%20AND%20assessment%5Btitl%5D)%20OR%20(recommendation*%5Btitl%5D%20AND%20(statement%5Btitl%5D%20OR%20Evidence-based%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(care%20AND%20((Patient%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20primary%5Btitl%5D%20OR%20psychosocial%5Btitl%5D))%20OR%20(Health%5Btitl%5D%20AND%20supervision%5Btitl%5D)%20OR%20(statement%5Btitl%5D%20AND%20(policy%5Btitl%5D%20OR%20position%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(pharmacogenetics%5Btitl%5D%20AND%20(Dosing%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20genotype*%5Btitl%5D%20OR%20drug*%5Btitl%5D))%20OR%20(Chemotherapy%5Btitl%5D%20AND%20decision*%5Btitl%5D)%20OR%20(screening%5Btitl%5D%20AND%20(newborn%5Btitl%5D%20OR%20neonat*%5Btitl%5D%20OR%20detection%5Btitl%5D%20OR%20diagnos*%5Btitl%5D))%20OR%20(criteria%5Btitl%5D%20OR%20genotype*%5Btitl%5D)%20)%20NOT%20(%22Case%20reports%22%5BPublication%20type%5D%20OR%20%22clinical%20study%22%5BPublication%20Type%5D%20OR%20%22randomized%20controlled%20trial%22%5BPublication%20Type%5D)" title="PubMed search">See all (1)</a></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/37581289">Myelin protein zero mutation-related hereditary neuropathies: Neuropathological insight from a new nerve biopsy cohort.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Bremer J,
Meinhardt A,
Katona I,
Senderek J,
Kämmerer-Gassler EK,
Roos A,
Ferbert A,
Schröder JM,
Nikolin S,
Nolte K,
Sellhaus B,
Popzhelyazkova K,
Tacke F,
Schara-Schmidt U,
Neuen-Jacob E,
de Groote CC,
de Jonghe P,
Timmerman V,
Baets J,
Weis J</span><br />
<span class="medgenPMjournal">Brain Pathol</span>
2024 Jan;34(1):e13200.
Epub 2023 Aug 15
doi: 10.1111/bpa.13200.
<span class="bold">PMID: </span><a href="/pubmed/37581289" target="_blank">37581289</a><a href="/pmc/articles/PMC10711263" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/31829048">An update on clinical, pathological, diagnostic, and therapeutic perspectives of childhood leukodystrophies.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ashrafi MR,
Amanat M,
Garshasbi M,
Kameli R,
Nilipour Y,
Heidari M,
Rezaei Z,
Tavasoli AR</span><br />
<span class="medgenPMjournal">Expert Rev Neurother</span>
2020 Jan;20(1):65-84.
Epub 2019 Dec 12
doi: 10.1080/14737175.2020.1699060.
<span class="bold">PMID: </span><a href="/pubmed/31829048" target="_blank">31829048</a></div>
<div class="nl"><a target="_blank" href="/pubmed/21840889">Genetic spectrum of hereditary neuropathies with onset in the first year of life.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Baets J,
Deconinck T,
De Vriendt E,
Zimoń M,
Yperzeele L,
Van Hoorenbeeck K,
Peeters K,
Spiegel R,
Parman Y,
Ceulemans B,
Van Bogaert P,
Pou-Serradell A,
Bernert G,
Dinopoulos A,
Auer-Grumbach M,
Sallinen SL,
Fabrizi GM,
Pauly F,
Van den Bergh P,
Bilir B,
Battaloglu E,
Madrid RE,
Kabzińska D,
Kochanski A,
Topaloglu H,
Miller G,
Jordanova A,
Timmerman V,
De Jonghe P</span><br />
<span class="medgenPMjournal">Brain</span>
2011 Sep;134(Pt 9):2664-76.
Epub 2011 Aug 11
doi: 10.1093/brain/awr184.
<span class="bold">PMID: </span><a href="/pubmed/21840889" target="_blank">21840889</a><a href="/pmc/articles/PMC3170533" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/16775366">Molecular genetics of autosomal-dominant demyelinating Charcot-Marie-Tooth disease.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Houlden H,
Reilly MM</span><br />
<span class="medgenPMjournal">Neuromolecular Med</span>
2006;8(1-2):43-62.
doi: 10.1385/nmm:8:1-2:43.
<span class="bold">PMID: </span><a href="/pubmed/16775366" target="_blank">16775366</a></div>
<div class="nl"><a target="_blank" href="/pubmed/10207934">Congenital hypomyelinating neuropathy: two patients with long-term follow-up.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Phillips JP,
Warner LE,
Lupski JR,
Garg BP</span><br />
<span class="medgenPMjournal">Pediatr Neurol</span>
1999 Mar;20(3):226-32.
doi: 10.1016/s0887-8994(98)00138-6.
<span class="bold">PMID: </span><a href="/pubmed/10207934" target="_blank">10207934</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Neuropathy%2C%20congenital%20hypomyelinating%2C%202%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 (13)</a></div><h3 class="subhead">Diagnosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/31829048">An update on clinical, pathological, diagnostic, and therapeutic perspectives of childhood leukodystrophies.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ashrafi MR,
Amanat M,
Garshasbi M,
Kameli R,
Nilipour Y,
Heidari M,
Rezaei Z,
Tavasoli AR</span><br />
<span class="medgenPMjournal">Expert Rev Neurother</span>
2020 Jan;20(1):65-84.
Epub 2019 Dec 12
doi: 10.1080/14737175.2020.1699060.
<span class="bold">PMID: </span><a href="/pubmed/31829048" target="_blank">31829048</a></div>
<div class="nl"><a target="_blank" href="/pubmed/21911699">Hypomyelination and congenital cataract: broadening the clinical phenotype.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Biancheri R,
Zara F,
Rossi A,
Mathot M,
Nassogne MC,
Yalcinkaya C,
Erturk O,
Tuysuz B,
Di Rocco M,
Gazzerro E,
Bugiani M,
van Spaendonk R,
Sistermans EA,
Minetti C,
van der Knaap MS,
Wolf NI</span><br />
<span class="medgenPMjournal">Arch Neurol</span>
2011 Sep;68(9):1191-4.
doi: 10.1001/archneurol.2011.201.
<span class="bold">PMID: </span><a href="/pubmed/21911699" target="_blank">21911699</a></div>
<div class="nl"><a target="_blank" href="/pubmed/20976668">Clinical implications of peripheral myelin protein 22 for nerve compression and neural regeneration: a review.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hui-Chou HG,
Hashemi SS,
Hoke A,
Dellon AL</span><br />
<span class="medgenPMjournal">J Reconstr Microsurg</span>
2011 Jan;27(1):67-74.
Epub 2010 Oct 25
doi: 10.1055/s-0030-1267832.
<span class="bold">PMID: </span><a href="/pubmed/20976668" target="_blank">20976668</a></div>
<div class="nl"><a target="_blank" href="/pubmed/10514227">Charcot-marie-tooth disease and related neuropathies: molecular basis for distinction and diagnosis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Pareyson D</span><br />
<span class="medgenPMjournal">Muscle Nerve</span>
1999 Nov;22(11):1498-509.
doi: 10.1002/(sici)1097-4598(199911)22:11&lt;1498::aid-mus4&gt;3.0.co;2-9.
<span class="bold">PMID: </span><a href="/pubmed/10514227" target="_blank">10514227</a></div>
<div class="nl"><a target="_blank" href="/pubmed/10207934">Congenital hypomyelinating neuropathy: two patients with long-term follow-up.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Phillips JP,
Warner LE,
Lupski JR,
Garg BP</span><br />
<span class="medgenPMjournal">Pediatr Neurol</span>
1999 Mar;20(3):226-32.
doi: 10.1016/s0887-8994(98)00138-6.
<span class="bold">PMID: </span><a href="/pubmed/10207934" target="_blank">10207934</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Neuropathy%2C%20congenital%20hypomyelinating%2C%202%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 (19)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/31852952">A de novo EGR2 variant, c.1232A&gt;G p.Asp411Gly, causes severe early-onset Charcot-Marie-Tooth Neuropathy Type 3 (Dejerine-Sottas Neuropathy).</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Grosz BR,
Golovchenko NB,
Ellis M,
Kumar K,
Nicholson GA,
Antonellis A,
Kennerson ML</span><br />
<span class="medgenPMjournal">Sci Rep</span>
2019 Dec 18;9(1):19336.
doi: 10.1038/s41598-019-55875-4.
<span class="bold">PMID: </span><a href="/pubmed/31852952" target="_blank">31852952</a><a href="/pmc/articles/PMC6920433" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/19244508">Congenital hypomyelinating neuropathy with lethal conduction failure in mice carrying the Egr2 I268N mutation.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Baloh RH,
Strickland A,
Ryu E,
Le N,
Fahrner T,
Yang M,
Nagarajan R,
Milbrandt J</span><br />
<span class="medgenPMjournal">J Neurosci</span>
2009 Feb 25;29(8):2312-21.
doi: 10.1523/JNEUROSCI.2168-08.2009.
<span class="bold">PMID: </span><a href="/pubmed/19244508" target="_blank">19244508</a><a href="/pmc/articles/PMC2679588" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/12001651">Phenotype and genotype correlation in childhood spinal muscular atrophy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hausmanowa-Petrusewicz I</span><br />
<span class="medgenPMjournal">Neurol Neurochir Pol</span>
2001;35 Suppl 3:29-35.
<span class="bold">PMID: </span><a href="/pubmed/12001651" target="_blank">12001651</a></div>
<div class="nl"><a target="_blank" href="/pubmed/10207934">Congenital hypomyelinating neuropathy: two patients with long-term follow-up.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Phillips JP,
Warner LE,
Lupski JR,
Garg BP</span><br />
<span class="medgenPMjournal">Pediatr Neurol</span>
1999 Mar;20(3):226-32.
doi: 10.1016/s0887-8994(98)00138-6.
<span class="bold">PMID: </span><a href="/pubmed/10207934" target="_blank">10207934</a></div>
<div class="nl"><a target="_blank" href="/pubmed/9044408">Congenital hypomyelinating neuropathy: a reversible case.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ghamdi M,
Armstrong DL,
Miller G</span><br />
<span class="medgenPMjournal">Pediatr Neurol</span>
1997 Jan;16(1):71-3.
doi: 10.1016/s0887-8994(96)00262-7.
<span class="bold">PMID: </span><a href="/pubmed/9044408" target="_blank">9044408</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Neuropathy%2C%20congenital%20hypomyelinating%2C%202%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 (6)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/37581289">Myelin protein zero mutation-related hereditary neuropathies: Neuropathological insight from a new nerve biopsy cohort.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Bremer J,
Meinhardt A,
Katona I,
Senderek J,
Kämmerer-Gassler EK,
Roos A,
Ferbert A,
Schröder JM,
Nikolin S,
Nolte K,
Sellhaus B,
Popzhelyazkova K,
Tacke F,
Schara-Schmidt U,
Neuen-Jacob E,
de Groote CC,
de Jonghe P,
Timmerman V,
Baets J,
Weis J</span><br />
<span class="medgenPMjournal">Brain Pathol</span>
2024 Jan;34(1):e13200.
Epub 2023 Aug 15
doi: 10.1111/bpa.13200.
<span class="bold">PMID: </span><a href="/pubmed/37581289" target="_blank">37581289</a><a href="/pmc/articles/PMC10711263" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/37306961">EGR2 gene-linked hereditary neuropathies present with a bimodal age distribution at symptoms onset.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Echaniz-Laguna A,
Cauquil C,
Chanson JB,
Tard C,
Guyant-Marechal L,
Kuntzer T,
Ion IM,
Lia AS,
Bouligand J,
Poinsignon V</span><br />
<span class="medgenPMjournal">J Peripher Nerv Syst</span>
2023 Sep;28(3):359-367.
Epub 2023 Jun 18
doi: 10.1111/jns.12572.
<span class="bold">PMID: </span><a href="/pubmed/37306961" target="_blank">37306961</a></div>
<div class="nl"><a target="_blank" href="/pubmed/16136673">Nab proteins are essential for peripheral nervous system myelination.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Le N,
Nagarajan R,
Wang JY,
Svaren J,
LaPash C,
Araki T,
Schmidt RE,
Milbrandt J</span><br />
<span class="medgenPMjournal">Nat Neurosci</span>
2005 Jul;8(7):932-40.
doi: 10.1038/nn1490.
<span class="bold">PMID: </span><a href="/pubmed/16136673" target="_blank">16136673</a></div>
<div class="nl"><a target="_blank" href="/pubmed/10442556">Peripheral nerve abnormalities in the congenital cataracts facial dysmorphism neuropathy (CCFDN) syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Tournev I,
King RH,
Workman J,
Nourallah M,
Muddle JR,
Kalaydjieva L,
Romanski K,
Thomas PK</span><br />
<span class="medgenPMjournal">Acta Neuropathol</span>
1999 Aug;98(2):165-70.
doi: 10.1007/s004010051065.
<span class="bold">PMID: </span><a href="/pubmed/10442556" target="_blank">10442556</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3673511">Congenital hypo- and hypermyelination neuropathy. Two cases.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Vallat JM,
Gil R,
Leboutet MJ,
Hugon J,
Moulies D</span><br />
<span class="medgenPMjournal">Acta Neuropathol</span>
1987;74(2):197-201.
doi: 10.1007/BF00692853.
<span class="bold">PMID: </span><a href="/pubmed/3673511" target="_blank">3673511</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Neuropathy%2C%20congenital%20hypomyelinating%2C%202%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 (10)</a></div></div>
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<div class="portlet_content ln"><ul><li><a href="/gtr/tests?term=C4722277%5bDISCUI%5d&amp;filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (5)</a></li>
<li><a href="/gtr/tests?term=C4722277%5bDISCUI%5d&amp;filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (6)</a></li>
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<div class="portlet_content ln"><ul><li><a href="https://www.omim.org/search?index=entry&amp;start=1&amp;limit=10&amp;sort=score%20desc&amp;field=number&amp;search=618184" target="_blank">OMIM</a></li><li><a href="https://clinicaltrials.gov/search?cond=Neuropathy,%20congenital%20hypomyelinating,%202" target="_blank">ClinicalTrials.gov</a></li></ul></div>
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<div class="portlet_content ln"><ul class="a_poppers"><li><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(neuropathy%2C%20congenital%20hypomyelinating%2C%202)%20AND%20(%22english%20and%20humans%22%5BFilter%5D)%20AND%20(%20(%22practice%20guideline%22%5BFilter%5D)%20OR%20(practice*%5Btitl%5D%20AND%20(guideline%5Btitl%5D%20OR%20parameter%5Btitl%5D%20OR%20resource%5Btitl%5D%20OR%20bulletin%5Btitl%5D%20OR%20best%5Btitl%5D))%20OR%20(genetic*%5Btitl%5D%20AND%20(evaluation%5Btitl%5D%20OR%20counseling%5Btitl%5D%20OR%20screening%5Btitl%5D%20OR%20test*%5Btitl%5D))%20OR%20(clinical%5Btitl%5D%20AND%20((expert%5Btitl%5D%20AND%20consensus%5Btitl%5D)%20OR%20utility%5Btitl%5D%20OR%20guideline*%5Btitl%5D))%20OR%20(management%5Btitl%5D%20AND%20(clinical%5Btitl%5D%20OR%20diagnos*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20pain%5Btitl%5D%20OR%20surveillance%5Btitl%5D%20OR%20emergency%5Btitl%5D%20OR%20guideline*%5Btitl%5D%20OR%20therap*))%20OR%20(treatment%5Btitl%5D%20AND%20((evaluation%5Btitl%5D%20AND%20diagnosis%5Btitl%5D)%20OR%20(assessment%5Btitl%5D%20AND%20prevention%5Btitl%5D)%20OR%20therap*))%20OR%20(Diagnos*%5Btitl%5D%20AND%20(prenatal%5Btitl%5D%20OR%20treatment%5Btitl%5D%20OR%20follow-up%5Btitl%5D%20OR%20statement%5Btitl%5D%20OR%20criteria%5Btitl%5D%20OR%20newborn%5Btitl%5D%20OR%20differential%5Btitl%5D%20OR%20neonatal%5Btitl%5D%20OR%20neonate%5Btitl%5D))%20OR%20(guideline*%5Btitl%5D%20AND%20(pharmacogenetic*%5Btitl%5D%20OR%20recommendation%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20evidence-based%5Btitl%5D%20OR%20consensus%5Btitl%5D%20OR%20(technical%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20(molecular%5Btitl%5D%20AND%20testing%5Btitl%5D)))%20OR%20(risk%5Btitl%5D%20AND%20assessment%5Btitl%5D)%20OR%20(recommendation*%5Btitl%5D%20AND%20(statement%5Btitl%5D%20OR%20Evidence-based%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(care%20AND%20((Patient%5Btitl%5D%20AND%20standard*%5Btitl%5D)%20OR%20primary%5Btitl%5D%20OR%20psychosocial%5Btitl%5D))%20OR%20(Health%5Btitl%5D%20AND%20supervision%5Btitl%5D)%20OR%20(statement%5Btitl%5D%20AND%20(policy%5Btitl%5D%20OR%20position%5Btitl%5D%20OR%20Consensus%5Btitl%5D))%20OR%20(pharmacogenetics%5Btitl%5D%20AND%20(Dosing%5Btitl%5D%20OR%20therap*%5Btitl%5D%20OR%20genotype*%5Btitl%5D%20OR%20drug*%5Btitl%5D))%20OR%20(Chemotherapy%5Btitl%5D%20AND%20decision*%5Btitl%5D)%20OR%20(screening%5Btitl%5D%20AND%20(newborn%5Btitl%5D%20OR%20neonat*%5Btitl%5D%20OR%20detection%5Btitl%5D%20OR%20diagnos*%5Btitl%5D))%20OR%20(criteria%5Btitl%5D%20OR%20genotype*%5Btitl%5D)%20)%20NOT%20(%22Case%20reports%22%5BPublication%20type%5D%20OR%20%22clinical%20study%22%5BPublication%20Type%5D%20OR%20%22randomized%20controlled%20trial%22%5BPublication%20Type%5D)" title="PubMed search">PubMed</a><div class="help-popup">See practice and clinical guidelines in PubMed. The search results may include broader topics and may not capture all published guidelines. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div></li></ul></div>
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