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<meta name="keywords" content="C1968556, disease or syndrome, encephalopathy, neonatal severe, encephalopathy, neonatal severe, due to mecp2 mutation, encephalopathy, neonatal severe, due to mecp2 mutations, encephalopathy, neonatal severe, x-linked recessive, mecp2, mecp2-related severe neonatal encephalopathy, severe congenital encephalopathy due to mecp2 (methyl-cpg binding protein 2) mutation, severe congenital encephalopathy due to mecp2 mutation, severe congenital encephalopathy due to methyl-cpg binding protein 2 mutation, severe neonatal encephalopathy due to mecp2 mutations, severe neonatal onset encephalopathy with microcephaly, severe neonatal-onset encephalopathy with microcephaly, 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="The spectrum of MECP2-related phenotypes in females ranges from classic Rett syndrome to variant Rett syndrome with a broader clinical phenotype (either milder or more severe than classic Rett syndrome) to mild learning disabilities; the spectrum in males ranges from severe neonatal encephalopathy to pyramidal signs, parkinsonism, and macroorchidism (PPM-X) syndrome to severe syndromic/nonsyndromic intellectual disability. Females: Classic Rett syndrome, a progressive neurodevelopmental disorder primarily affecting girls, is characterized by apparently normal psychomotor development during the first six to 18 months of life, followed by a short period of developmental stagnation, then rapid regression in language and motor skills, followed by long-term stability. During the phase of rapid regression, repetitive, stereotypic hand movements replace purposeful hand use. Additional findings include fits of screaming and inconsolable crying, autistic features, panic-like attacks, bruxism, episodic apnea and/or hyperpnea, gait ataxia and apraxia, tremors, seizures, and acquired microcephaly. Males: Severe neonatal-onset encephalopathy, the most common phenotype in affected males, is characterized by a relentless clinical course that follows a metabolic-degenerative type of pattern, abnormal tone, involuntary movements, severe seizures, and breathing abnormalities. Death often occurs before age two years." /><meta name="robots" content="index,nofollow,noarchive" />
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<title>Severe neonatal-onset encephalopathy with microcephaly (Concept Id: C1968556)
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<!--
UID=409616
ConceptID=C1968556
-->
<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">Severe neonatal-onset encephalopathy with microcephaly</div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>409616</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.">C1968556</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>Encephalopathy, neonatal severe; Encephalopathy, neonatal severe, due to MECP2 mutations</td></tr>
<tr><td><span class="bold">SNOMED CT: </span></td>
<td>Severe congenital encephalopathy due to methyl-CpG binding protein 2 mutation (771303004); Severe neonatal onset encephalopathy with microcephaly (771303004); Severe congenital encephalopathy due to MECP2 mutation (771303004); Severe congenital encephalopathy due to MECP2 (methyl-CpG binding protein 2) mutation (771303004); MECP2-related severe neonatal encephalopathy (771303004)</td></tr>
<tr><td>Modes of inheritance:</td>
<td>
<div class="divPopper rprt" id="moi_375779"><div><strong>X-linked recessive inheritance</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>375779</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.">C1845977</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Source: Orphanet</div>
<div class="spaceAbove">A mode of inheritance that is observed for recessive traits related to a gene encoded on the X chromosome. In the context of medical genetics, X-linked recessive disorders manifest in males (who have one copy of the X chromosome and are thus hemizygotes), but generally not in female heterozygotes who have one mutant and one normal allele.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/375779">This record</a></div></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#moi_375779" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">X-linked recessive inheritance</a><span> (Orphanet)</span></div></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="MECP2 - ID: 4204 - NCBI Gene" href="/gene/4204" class="medgenPMinfo">MECP2</a> (Xq28)</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td>Monarch Initiative:</td>
<td><a href="https://monarchinitiative.org/disease/MONDO:0010397" target="_blank">MONDO:0010397</a></td></tr>
<tr><td>OMIM<span class="superscript">®</span>:</td>
<td><a href="https://omim.org/entry/300673" target="_blank">300673</a></td></tr>
<tr><td>Orphanet:</td>
<td><a target="_blank" title="Orphanet: The portal for rare diseases and orphan drugs" href="http://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&amp;Expert=209370">ORPHA209370</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>
<div class="portlet mgSection" id="ID_101">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Disease_characteristics">Disease characteristics</h1><a sid="101" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><div class="excerpt">Excerpted from the <i>GeneReview: </i><a href="/books/NBK1497" target="_blank">MECP2 Disorders</a></div><div>The spectrum of MECP2-related phenotypes in females ranges from classic Rett syndrome to variant Rett syndrome with a broader clinical phenotype (either milder or more severe than classic Rett syndrome) to mild learning disabilities; the spectrum in males ranges from severe neonatal encephalopathy to pyramidal signs, parkinsonism, and macroorchidism (PPM-X) syndrome to severe syndromic/nonsyndromic intellectual disability. Females: Classic Rett syndrome, a progressive neurodevelopmental disorder primarily affecting girls, is characterized by apparently normal psychomotor development during the first six to 18 months of life, followed by a short period of developmental stagnation, then rapid regression in language and motor skills, followed by long-term stability. During the phase of rapid regression, repetitive, stereotypic hand movements replace purposeful hand use. Additional findings include fits of screaming and inconsolable crying, autistic features, panic-like attacks, bruxism, episodic apnea and/or hyperpnea, gait ataxia and apraxia, tremors, seizures, and acquired microcephaly. Males: Severe neonatal-onset encephalopathy, the most common phenotype in affected males, is characterized by a relentless clinical course that follows a metabolic-degenerative type of pattern, abnormal tone, involuntary movements, severe seizures, and breathing abnormalities. Death often occurs before age two years. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</div><div class="spaceAbove"><strong>Full text of <i>GeneReview</i> (by section):</strong><br /><a class="medgenPMinfo" href="/books/NBK1497#rett.Summary" target="NBK1497">Summary</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.GeneReview_Scope" target="NBK1497">GeneReview Scope</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Diagnosis" target="NBK1497">Diagnosis</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Clinical_Characteristics" target="NBK1497">Clinical Characteristics</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Genetically_Related_Allelic_Disorde" target="NBK1497">Genetically Related (Allelic) Disorders</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Differential_Diagnosis" target="NBK1497">Differential Diagnosis</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Management" target="NBK1497">Management</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Genetic_Counseling" target="NBK1497">Genetic Counseling</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Resources" target="NBK1497">Resources</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Molecular_Genetics" target="NBK1497">Molecular Genetics</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.Chapter_Notes" target="NBK1497">Chapter Notes</a>  |  <a class="medgenPMinfo" href="/books/NBK1497#rett.References" target="NBK1497">References</a></div><div class="spaceAbove"><strong>Authors:</strong><br />
Simranpreet Kaur  |  John Christodoulou   <a href="/books/NBK1497" target="NBK1497" title="NCBI Bookshelf: MECP2 Disorders">view full author information</a></div></div>
</div>
<div class="portlet mgSection" id="ID_117">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Additional_descriptions">Additional descriptions</h1><a sid="117" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><div class="mgSection"><strong>From OMIM</strong><br />The MECP2 gene is mutated in Rett syndrome (RTT; 312750), a severe neurodevelopmental disorder that almost always occurs in females. Although it was first thought that MECP2 mutations causing Rett syndrome were lethal in males, later reports identified a severe neonatal encephalopathy in surviving male sibs of patients with Rett syndrome. Since then, additional reports have confirmed a severe phenotype in males with RTT-associated MECP2 mutations (Moog et al., 2003; Villard, 2007).&#13;
Males with non-RTT mutations in the MECP2 gene can demonstrate a wide variety of phenotypes: see also X-linked syndromic intellectual developmental disorder-13 (300055), Lubs-type X-linked syndromic intellectual developmental disorder (300260), and neonatal severe encephalopathy (300673).  <a target="_blank" href="http://www.omim.org/entry/300673">http://www.omim.org/entry/300673</a></div><div class="mgSection"><strong>From MedlinePlus Genetics</strong><br />MECP2-related severe neonatal encephalopathy is a neurological disorder that primarily affects males and causes brain dysfunction (encephalopathy). Affected males have a small head size (microcephaly), poor muscle tone (hypotonia) in infancy, movement disorders, rigidity, and seizures. Infants with this condition appear normal at birth but then develop severe encephalopathy within the first week of life. These babies experience poor feeding, leading to a failure to gain weight and grow at the expected rate (failure to thrive). Individuals with MECP2-related severe neonatal encephalopathy have severe to profound intellectual disability. Affected males have breathing problems, with some having episodes in which breathing slows or stops for short periods (apnea). As the child ages, the apnea episodes tend to last longer, especially during sleep, and affected babies often require use of a machine to help regulate their breathing (mechanical ventilation). Most males with MECP2-related severe neonatal encephalopathy do not live past the age of 2 because of respiratory failure.<br /><br />MECP2-related severe neonatal encephalopathy is the most severe condition in a spectrum of disorders with the same genetic cause. The mildest is PPM-X syndrome, followed by MECP2 duplication syndrome, then Rett syndrome (which exclusively affects females), and finally MECP2-related severe neonatal encephalopathy.  <a target="_blank" href="https://medlineplus.gov/genetics/condition/mecp2-related-severe-neonatal-encephalopathy">https://medlineplus.gov/genetics/condition/mecp2-related-severe-neonatal-encephalopathy</a></div></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_746019"><div><strong>Failure to thrive</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>746019</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.">C2315100</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Failure to thrive (FTT) refers to a child whose physical growth is substantially below the norm.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/746019">Feature record</a> | <a href="/medgen?term=%22Failure%20to%20thrive%22%5BClinical%20Features%5D%20OR%20746019%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_436211"><div><strong>Feeding difficulties in infancy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>436211</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.">C2674608</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Impaired feeding performance of an infant as manifested by difficulties such as weak and ineffective sucking, brief bursts of sucking, and falling asleep during sucking. There may be difficulties with chewing or maintaining attention.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/436211">Feature record</a> | <a href="/medgen?term=%22Feeding%20difficulties%20in%20infancy%22%5BClinical%20Features%5D%20OR%20436211%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1368658"><div><strong>Gastroesophageal reflux</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1368658</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.">C4317146</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A condition in which the stomach contents leak backwards from the stomach into the esophagus through the lower esophageal sphincter.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1368658">Feature record</a> | <a href="/medgen?term=%22Gastroesophageal%20reflux%22%5BClinical%20Features%5D%20OR%201368658%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_10234"><div><strong>Myoclonus</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>10234</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.">C0027066</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/10234">Feature record</a> | <a href="/medgen?term=%22Myoclonus%22%5BClinical%20Features%5D%20OR%2010234%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_20693"><div><strong>Seizure</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>20693</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.">C0036572</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/20693">Feature record</a> | <a href="/medgen?term=%22Seizure%22%5BClinical%20Features%5D%20OR%2020693%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_48638"><div><strong>Intellectual disability, severe</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>48638</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.">C0036857</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Severe mental retardation is defined as an intelligence quotient (IQ) in the range of 20-34.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/48638">Feature record</a> | <a href="/medgen?term=%22Intellectual%20disability%2C%20severe%22%5BClinical%20Features%5D%20OR%2048638%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_39314"><div><strong>Encephalopathy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>39314</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.">C0085584</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Encephalopathy is a term that means brain disease, damage, or malfunction. In general, encephalopathy is manifested by an altered mental state.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/39314">Feature record</a> | <a href="/medgen?term=%22Encephalopathy%22%5BClinical%20Features%5D%20OR%2039314%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_56235"><div><strong>EEG abnormality</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>56235</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.">C0151611</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Abnormality observed by electroencephalogram (EEG), which is used to record of the brain's spontaneous electrical activity from multiple electrodes placed on the scalp.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/56235">Feature record</a> | <a href="/medgen?term=%22EEG%20abnormality%22%5BClinical%20Features%5D%20OR%2056235%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_57738"><div><strong>Hyperreflexia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>57738</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.">C0151889</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Hyperreflexia is the presence of hyperactive stretch reflexes of the muscles.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/57738">Feature record</a> | <a href="/medgen?term=%22Hyperreflexia%22%5BClinical%20Features%5D%20OR%2057738%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_78605"><div><strong>Polymicrogyria</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>78605</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.">C0266464</a></dd><dt><span class="dotprefix"></span></dt><dd>Congenital Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Polymicrogyria is a congenital malformation of the cerebral cortex characterized by abnormal cortical layering (lamination) and an excessive number of small gyri (folds).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/78605">Feature record</a> | <a href="/medgen?term=%22Polymicrogyria%22%5BClinical%20Features%5D%20OR%2078605%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_107838"><div><strong>Global developmental delay</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>107838</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.">C0557874</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/107838">Feature record</a> | <a href="/medgen?term=%22Global%20developmental%20delay%22%5BClinical%20Features%5D%20OR%20107838%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_337397"><div><strong>Intellectual disability, progressive</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>337397</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.">C1846149</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">The term progressive intellectual disability should be used if intelligence decreases/deteriorates over time.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/337397">Feature record</a> | <a href="/medgen?term=%22Intellectual%20disability%2C%20progressive%22%5BClinical%20Features%5D%20OR%20337397%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_7752"><div><strong>Rigidity</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>7752</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.">C0026837</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">Continuous involuntary sustained muscle contraction. When an affected muscle is passively stretched, the degree of resistance remains constant regardless of the rate at which the muscle is stretched. This feature helps to distinguish rigidity from muscle spasticity.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/7752">Feature record</a> | <a href="/medgen?term=%22Rigidity%22%5BClinical%20Features%5D%20OR%207752%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_340542"><div><strong>Progressive microcephaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>340542</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.">C1850456</a></dd><dt><span class="dotprefix"></span></dt><dd>Anatomical Abnormality</dd></dl></div></div></div>
<div class="spaceAbove">Progressive microcephaly is diagnosed when the head circumference falls progressively behind age- and gender-dependent norms.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/340542">Feature record</a> | <a href="/medgen?term=%22Progressive%20microcephaly%22%5BClinical%20Features%5D%20OR%20340542%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_342959"><div><strong>Axial hypotonia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>342959</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.">C1853743</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/342959">Feature record</a> | <a href="/medgen?term=%22Axial%20hypotonia%22%5BClinical%20Features%5D%20OR%20342959%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_2009"><div><strong>Apnea</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>2009</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.">C0003578</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">Lack of breathing with no movement of the respiratory muscles and no exchange of air in the lungs. This term refers to a disposition to have recurrent episodes of apnea rather than to a single event.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/2009">Feature record</a> | <a href="/medgen?term=%22Apnea%22%5BClinical%20Features%5D%20OR%202009%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_11197"><div><strong>Respiratory insufficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>11197</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.">C0035229</a></dd><dt><span class="dotprefix"></span></dt><dd>Pathologic Function</dd></dl></div></div></div>
<div class="spaceAbove">Impairment of gas exchange within the lungs secondary to a disease process, neoplasm, or trauma, possibly resulting in hypoxia, hypercarbia, or both, but not requiring intubation or mechanical ventilation. Patients are normally managed with pharmaceutical therapy, supplemental oxygen, or both.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/11197">Feature record</a> | <a href="/medgen?term=%22Respiratory%20insufficiency%22%5BClinical%20Features%5D%20OR%2011197%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_812169"><div><strong>Central hypoventilation</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>812169</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.">C3805839</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/812169">Feature record</a> | <a href="/medgen?term=%22Central%20hypoventilation%22%5BClinical%20Features%5D%20OR%20812169%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 the digestive system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_436211" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Feeding difficulties in infancy</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1368658" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Gastroesophageal reflux</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_342959" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Axial hypotonia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_340542" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Progressive microcephaly</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_7752" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Rigidity</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_56235" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">EEG abnormality</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_39314" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Encephalopathy</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_107838" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Global developmental delay</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_57738" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hyperreflexia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_337397" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, progressive</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_48638" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, severe</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_10234" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Myoclonus</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_78605" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Polymicrogyria</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_20693" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Seizure</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_2009" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Apnea</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_812169" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Central hypoventilation</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_11197" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Respiratory insufficiency</a></span></li></ul></li><li><span class="TLline">Growth abnormality</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_746019" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Failure to thrive</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><li><a href="#tabORDO">Orphanet</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=C0035372[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=48441">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=48441" target="_blank" href="/omim/300005">O</a></span><span class="chiclet Gcolor" title="GeneReviews"><a target="_blank" href="/books/NBK1497/" ref="ncbi_uid=48441">G</a></span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=48441" ref="ncbi_uid=48441">V</a></span></span><span class="TLline"><a href="/medgen/48441" ref="tree=GTR&amp;ncbi_uid=48441&amp;link_uid=48441" title="View MedGen record for 'Rett syndrome'">Rett syndrome</a></span><ul><li class="matched_ds"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C1968556[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=409616">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=409616" target="_blank" href="/omim/300005">O</a></span><span class="chiclet Gcolor" title="GeneReviews"><a target="_blank" href="/books/NBK1497/" ref="ncbi_uid=409616">G</a></span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=409616" ref="ncbi_uid=409616">V</a></span></span><span class="TLline">Severe neonatal-onset encephalopathy with microcephaly</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/1842675" ref="tree=MeSH" title="MedGen record for Monogenic epilepsy">Monogenic epilepsy</a></span><ul><li><span class="matched_ds">Severe neonatal-onset encephalopathy with microcephaly</span></li></ul></li></ul></div></div><div id="tabORDO">Follow <a target="_blank" href="http://www.orpha.net/consor/cgi-bin/Disease_Classif.php?lng=EN&amp;data_id=156&amp;PatId=18656&amp;search=Disease_Classif_Simple&amp;new=1" class="ital bold">this link</a> to review classifications for <span class="ital">Severe neonatal-onset encephalopathy with microcephaly</span> in Orphanet.</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/9840674">The controversy regarding diagnostic criteria for early myoclonic encephalopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Wang PJ,
Lee WT,
Hwu WL,
Young C,
Yau KI,
Shen YZ</span><br />
<span class="medgenPMjournal">Brain Dev</span>
1998 Oct;20(7):530-5.
doi: 10.1016/s0387-7604(98)00042-4.
<span class="bold">PMID: </span><a href="/pubmed/9840674" target="_blank">9840674</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(severe%20neonatal-onset%20encephalopathy%20with%20microcephaly)%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/34449156">Severe isolated sulfide oxidase deficiency with a novel mutation.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ergene M,
Yarar N,
Öncel EP,
Sezer T,
Çavdarlı B,
Ecevit İZ,
Aydın Hİ</span><br />
<span class="medgenPMjournal">Turk J Pediatr</span>
2021;63(4):716-720.
doi: 10.24953/turkjped.2021.04.021.
<span class="bold">PMID: </span><a href="/pubmed/34449156" target="_blank">34449156</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30208878">GNPTAB c.2404C&gt;T nonsense mutation in a patient with mucolipidosis III alpha/beta: a case report.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ho CC,
Tsung LL,
Liu KT,
Poon WT</span><br />
<span class="medgenPMjournal">BMC Med Genet</span>
2018 Sep 12;19(1):162.
doi: 10.1186/s12881-018-0679-5.
<span class="bold">PMID: </span><a href="/pubmed/30208878" target="_blank">30208878</a><a href="/pmc/articles/PMC6134758" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Severe%20neonatal-onset%20encephalopathy%20with%20microcephaly%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/39715963">Childhood-onset focal epilepsy and acute para-infectious encephalopathy in a patient with biallelic QARS1 variants.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yahya V,
Monfrini E,
Celato A,
Botti I,
Guez S,
Scola E,
Del Bo R,
Di Fonzo A,
Dilena R</span><br />
<span class="medgenPMjournal">Neurol Sci</span>
2025 Mar;46(3):1395-1398.
Epub 2024 Dec 24
doi: 10.1007/s10072-024-07957-z.
<span class="bold">PMID: </span><a href="/pubmed/39715963" target="_blank">39715963</a></div>
<div class="nl"><a target="_blank" href="/pubmed/36731496">Genetic and clinical variations of developmental epileptic encephalopathies.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kaya Özçora GD,
Söbü E,
Gümüş U</span><br />
<span class="medgenPMjournal">Neurol Res</span>
2023 Mar;45(3):226-233.
Epub 2023 Feb 2
doi: 10.1080/01616412.2023.2170917.
<span class="bold">PMID: </span><a href="/pubmed/36731496" target="_blank">36731496</a></div>
<div class="nl"><a target="_blank" href="/pubmed/36599696">Clinical and Neurophysiologic Phenotypes in Neonates With BRAT1 Encephalopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Carapancea E,
Cornet MC,
Milh M,
De Cosmo L,
Huang EJ,
Granata T,
Striano P,
Ceulemans B,
Stein A,
Morris-Rosendahl D,
Conti G,
Mitra N,
Raymond FL,
Rowitch DH,
Solazzi R,
Vercellino F,
De Liso P,
D'Onofrio G,
Boniver C,
Danhaive O,
Carkeek K,
Salpietro V,
Weckhuysen S,
Fedrigo M,
Angelini A,
Castellotti B,
Lederer D,
Benoit V,
Raviglione F,
Guerrini R,
Dilena R,
Cilio MR</span><br />
<span class="medgenPMjournal">Neurology</span>
2023 Mar 21;100(12):e1234-e1247.
Epub 2023 Jan 4
doi: 10.1212/WNL.0000000000206755.
<span class="bold">PMID: </span><a href="/pubmed/36599696" target="_blank">36599696</a><a href="/pmc/articles/PMC10033164" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/34449156">Severe isolated sulfide oxidase deficiency with a novel mutation.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ergene M,
Yarar N,
Öncel EP,
Sezer T,
Çavdarlı B,
Ecevit İZ,
Aydın Hİ</span><br />
<span class="medgenPMjournal">Turk J Pediatr</span>
2021;63(4):716-720.
doi: 10.24953/turkjped.2021.04.021.
<span class="bold">PMID: </span><a href="/pubmed/34449156" target="_blank">34449156</a></div>
<div class="nl"><a target="_blank" href="/pubmed/9840674">The controversy regarding diagnostic criteria for early myoclonic encephalopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Wang PJ,
Lee WT,
Hwu WL,
Young C,
Yau KI,
Shen YZ</span><br />
<span class="medgenPMjournal">Brain Dev</span>
1998 Oct;20(7):530-5.
doi: 10.1016/s0387-7604(98)00042-4.
<span class="bold">PMID: </span><a href="/pubmed/9840674" target="_blank">9840674</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Severe%20neonatal-onset%20encephalopathy%20with%20microcephaly%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 (7)</a></div><h3 class="subhead">Therapy</h3>
<div class="nl"><a target="_blank" href="/pubmed/32531460">Rare homozygous nonsense variant in AIMP1 causing Early Onset Epileptic Encephalopathy with Burst Suppression (EOEE-BS).</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Gupta S,
Schwab M,
Valdez-Gonzalez K,
Segal E</span><br />
<span class="medgenPMjournal">Eur J Med Genet</span>
2020 Sep;63(9):103970.
Epub 2020 Jun 10
doi: 10.1016/j.ejmg.2020.103970.
<span class="bold">PMID: </span><a href="/pubmed/32531460" target="_blank">32531460</a></div>
<div class="nl"><a target="_blank" href="/pubmed/9840674">The controversy regarding diagnostic criteria for early myoclonic encephalopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Wang PJ,
Lee WT,
Hwu WL,
Young C,
Yau KI,
Shen YZ</span><br />
<span class="medgenPMjournal">Brain Dev</span>
1998 Oct;20(7):530-5.
doi: 10.1016/s0387-7604(98)00042-4.
<span class="bold">PMID: </span><a href="/pubmed/9840674" target="_blank">9840674</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Severe%20neonatal-onset%20encephalopathy%20with%20microcephaly%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 (2)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/39715963">Childhood-onset focal epilepsy and acute para-infectious encephalopathy in a patient with biallelic QARS1 variants.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yahya V,
Monfrini E,
Celato A,
Botti I,
Guez S,
Scola E,
Del Bo R,
Di Fonzo A,
Dilena R</span><br />
<span class="medgenPMjournal">Neurol Sci</span>
2025 Mar;46(3):1395-1398.
Epub 2024 Dec 24
doi: 10.1007/s10072-024-07957-z.
<span class="bold">PMID: </span><a href="/pubmed/39715963" target="_blank">39715963</a></div>
<div class="nl"><a target="_blank" href="/pubmed/36731496">Genetic and clinical variations of developmental epileptic encephalopathies.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kaya Özçora GD,
Söbü E,
Gümüş U</span><br />
<span class="medgenPMjournal">Neurol Res</span>
2023 Mar;45(3):226-233.
Epub 2023 Feb 2
doi: 10.1080/01616412.2023.2170917.
<span class="bold">PMID: </span><a href="/pubmed/36731496" target="_blank">36731496</a></div>
<div class="nl"><a target="_blank" href="/pubmed/33880529">ATP1A2- and ATP1A3-associated early profound epileptic encephalopathy and polymicrogyria.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Vetro A,
Nielsen HN,
Holm R,
Hevner RF,
Parrini E,
Powis Z,
Møller RS,
Bellan C,
Simonati A,
Lesca G,
Helbig KL,
Palmer EE,
Mei D,
Ballardini E,
Van Haeringen A,
Syrbe S,
Leuzzi V,
Cioni G,
Curry CJ,
Costain G,
Santucci M,
Chong K,
Mancini GMS,
Clayton-Smith J,
Bigoni S,
Scheffer IE,
Dobyns WB,
Vilsen B,
Guerrini R;
ATP1A2/A3-collaborators</span><br />
<span class="medgenPMjournal">Brain</span>
2021 Jun 22;144(5):1435-1450.
doi: 10.1093/brain/awab052.
<span class="bold">PMID: </span><a href="/pubmed/33880529" target="_blank">33880529</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Severe%20neonatal-onset%20encephalopathy%20with%20microcephaly%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 (3)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/39715963">Childhood-onset focal epilepsy and acute para-infectious encephalopathy in a patient with biallelic QARS1 variants.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yahya V,
Monfrini E,
Celato A,
Botti I,
Guez S,
Scola E,
Del Bo R,
Di Fonzo A,
Dilena R</span><br />
<span class="medgenPMjournal">Neurol Sci</span>
2025 Mar;46(3):1395-1398.
Epub 2024 Dec 24
doi: 10.1007/s10072-024-07957-z.
<span class="bold">PMID: </span><a href="/pubmed/39715963" target="_blank">39715963</a></div>
<div class="nl"><a target="_blank" href="/pubmed/36599696">Clinical and Neurophysiologic Phenotypes in Neonates With BRAT1 Encephalopathy.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Carapancea E,
Cornet MC,
Milh M,
De Cosmo L,
Huang EJ,
Granata T,
Striano P,
Ceulemans B,
Stein A,
Morris-Rosendahl D,
Conti G,
Mitra N,
Raymond FL,
Rowitch DH,
Solazzi R,
Vercellino F,
De Liso P,
D'Onofrio G,
Boniver C,
Danhaive O,
Carkeek K,
Salpietro V,
Weckhuysen S,
Fedrigo M,
Angelini A,
Castellotti B,
Lederer D,
Benoit V,
Raviglione F,
Guerrini R,
Dilena R,
Cilio MR</span><br />
<span class="medgenPMjournal">Neurology</span>
2023 Mar 21;100(12):e1234-e1247.
Epub 2023 Jan 4
doi: 10.1212/WNL.0000000000206755.
<span class="bold">PMID: </span><a href="/pubmed/36599696" target="_blank">36599696</a><a href="/pmc/articles/PMC10033164" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/33880529">ATP1A2- and ATP1A3-associated early profound epileptic encephalopathy and polymicrogyria.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Vetro A,
Nielsen HN,
Holm R,
Hevner RF,
Parrini E,
Powis Z,
Møller RS,
Bellan C,
Simonati A,
Lesca G,
Helbig KL,
Palmer EE,
Mei D,
Ballardini E,
Van Haeringen A,
Syrbe S,
Leuzzi V,
Cioni G,
Curry CJ,
Costain G,
Santucci M,
Chong K,
Mancini GMS,
Clayton-Smith J,
Bigoni S,
Scheffer IE,
Dobyns WB,
Vilsen B,
Guerrini R;
ATP1A2/A3-collaborators</span><br />
<span class="medgenPMjournal">Brain</span>
2021 Jun 22;144(5):1435-1450.
doi: 10.1093/brain/awab052.
<span class="bold">PMID: </span><a href="/pubmed/33880529" target="_blank">33880529</a></div>
<div class="nl"><a target="_blank" href="/pubmed/27072799">GNAO1 encephalopathy: further delineation of a severe neurodevelopmental syndrome affecting females.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Marcé-Grau A,
Dalton J,
López-Pisón J,
García-Jiménez MC,
Monge-Galindo L,
Cuenca-León E,
Giraldo J,
Macaya A</span><br />
<span class="medgenPMjournal">Orphanet J Rare Dis</span>
2016 Apr 12;11:38.
doi: 10.1186/s13023-016-0416-0.
<span class="bold">PMID: </span><a href="/pubmed/27072799" target="_blank">27072799</a><a href="/pmc/articles/PMC4830060" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Severe%20neonatal-onset%20encephalopathy%20with%20microcephaly%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 (4)</a></div></div>
</div>
</div></div></div></div></div></div></div>
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<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=C1968556%5bDISCUI%5d&amp;filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (39)</a></li>
<li><a href="/gtr/tests?term=C1968556%5bDISCUI%5d&amp;filter=method%3A2%5F18" target="_blank">Mutation scanning of select exons (1)</a></li>
<li><a href="/gtr/tests?term=C1968556%5bDISCUI%5d&amp;filter=method%3A2%5F17" target="_blank">Mutation scanning of the entire coding region (2)</a></li>
<li><a href="/gtr/tests?term=C1968556%5bDISCUI%5d&amp;filter=method%3A2%5F9" target="_blank">Sequence analysis of select exons (2)</a></li>
<li><a href="/gtr/tests?term=C1968556%5bDISCUI%5d&amp;filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (57)</a></li>
<li><a href="/gtr/tests?term=C1968556%5bDISCUI%5d&amp;filter=method%3A2%5F19" target="_blank">Targeted variant analysis (7)</a></li>
<li class="portletSeeAll portletSeeAllPad"><total><a href="/gtr/tests?term=C1968556%5bDISCUI%5d" target="_blank">See all (70)</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&amp;start=1&amp;limit=10&amp;sort=score%20desc&amp;field=number&amp;search=300673" target="_blank">OMIM</a></li><li><a href="http://www.orpha.net/consor/cgi-bin/OC_Exp.php?Expert=209370" target="_blank">Orphanet</a></li><li><a href="https://clinicaltrials.gov/search?cond=Severe%20neonatal-onset%20encephalopathy%20with%20microcephaly" target="_blank">ClinicalTrials.gov</a></li></ul></div>
</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=(severe%20neonatal-onset%20encephalopathy%20with%20microcephaly)%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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<div class="portlet_content ln"><ul><li><a href="http://www.omim.org/search?index=entry&amp;start=1&amp;limit=10&amp;sort=score%20desc&amp;field=number&amp;search=300005" target="_blank">OMIM</a></li><li><a href="/clinvar/?term=4204[geneid]" target="_blank">View MECP2 variations in ClinVar</a></li><li><a href="/nuccore/160624914" target="_blank">RefSeqGene</a></li><li><a href="https://catalog.coriell.org/Search?q=300673" target="_blank">Coriell Institute for Medical Research</a></li></ul></div>
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