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<meta name="keywords" content="C0151611, abnormal eeg, abnormal electroencephalogram, eeg abnormal, eeg abnormalities, eeg abnormality, electroencephalogram (eeg) abnormalities, electroencephalogram abnormal, electroencephalogram abnormalities, finding, 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="Abnormality observed by electroencephalogram (EEG), which is used to record of the brain's spontaneous electrical activity from multiple electrodes placed on the scalp." /><meta name="robots" content="index,nofollow,noarchive" />
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<!--
UID=56235
ConceptID=C0151611
-->
<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">EEG abnormality</div></h1><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><table class="medgenTable"><tbody><tr><td>Synonyms:</td>
<td>EEG abnormalities; Electroencephalogram (EEG) abnormalities</td></tr>
<tr><td><span class="bold">SNOMED CT: </span></td>
<td>EEG abnormal (274521009); Electroencephalogram abnormal (274521009)</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td>HPO:</td>
<td><a target="_blank" title="Human Phenotype Ontology" href="https://hpo.jax.org/app/browse/term/HP:0002353">HP:0002353</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">Abnormality observed by electroencephalogram (EEG), which is used to record of the brain's spontaneous electrical activity from multiple electrodes placed on the scalp. [from <a title="Human Phenotype Ontology" href="http://www.human-phenotype-ontology.org" class="defSource" target="_blank">HPO</a>]</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="matched_ds"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C0151611[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=56235">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=56235" ref="ncbi_uid=56235">V</a></span></span><span class="TLline">EEG abnormality</span></li></ul></div></div></div></div></div><div id="tabMGEN"><div class="ds_tree"><ul><li><span class="TLline"><a href="/medgen/1254" ref="tree=MeSH" title="MedGen record for Fetal anomaly">Fetal anomaly</a></span><ul><li><span class="TLline"><a href="/medgen/474891" ref="tree=MeSH" title="MedGen record for Congenital Systemic Disorder">Congenital Systemic Disorder</a></span><ul><li><span class="TLline"><a href="/medgen/105425" ref="tree=MeSH" title="MedGen record for Abnormality of the nervous system">Abnormality of the nervous system</a></span><ul><li><span class="TLline"><a href="/medgen/868417" ref="tree=MeSH" title="MedGen record for Abnormal nervous system physiology">Abnormal nervous system physiology</a></span><ul><li><span class="TLline"><a href="/medgen/867410" ref="tree=MeSH" title="MedGen record for Abnormal nervous system electrophysiology">Abnormal nervous system electrophysiology</a></span><ul><li><span class="TLline"><a href="/medgen/868205" ref="tree=MeSH" title="MedGen record for Abnormality of central nervous system electrophysiology">Abnormality of central nervous system electrophysiology</a></span><ul><li><span class="matched_ds">EEG abnormality</span><ul><li><span class="TLline"><a href="/medgen/1054147" ref="tree=MeSH" title="MedGen record for Delta brush pattern on EEG">Delta brush pattern on EEG</a></span></li><li><span class="TLline"><a href="/medgen/869053" ref="tree=MeSH" title="MedGen record for EEG with abnormally slow frequencies">EEG with abnormally slow frequencies</a></span><ul><li><span class="TLline"><a href="/medgen/866863" ref="tree=MeSH" title="MedGen record for EEG with focal slow activity">EEG with focal slow activity</a></span><ul><li><span class="TLline"><a href="/medgen/869047" ref="tree=MeSH" title="MedGen record for EEG with occipital slowing">EEG with occipital slowing</a></span></li><li><span class="TLline"><a href="/medgen/1057220" ref="tree=MeSH" title="MedGen record for EEG with temporal slowing">EEG with temporal slowing</a></span></li></ul></li><li><span class="TLline"><a href="/medgen/866862" ref="tree=MeSH" title="MedGen record for EEG with generalized slow activity">EEG with generalized slow activity</a></span><ul><li><span class="TLline"><a href="/medgen/869052" ref="tree=MeSH" title="MedGen record for EEG with continuous slow activity">EEG with continuous slow activity</a></span></li><li><span class="TLline"><a href="/medgen/869050" ref="tree=MeSH" title="MedGen record for EEG with generalized slow activity grade 1">EEG with generalized slow activity grade 1</a></span></li><li><span class="TLline"><a href="/medgen/869049" ref="tree=MeSH" title="MedGen record for EEG with generalized slow activity grade 2">EEG with generalized slow activity grade 2</a></span></li><li><span class="TLline"><a href="/medgen/869048" ref="tree=MeSH" title="MedGen record for EEG with generalized slow activity grade 3">EEG with generalized slow activity grade 3</a></span></li><li><span class="TLline"><a href="/medgen/866844" ref="tree=MeSH" title="MedGen record for EEG with generalized slow activity grade 4">EEG with generalized slow activity grade 4</a></span></li><li><span class="TLline"><a href="/medgen/869051" ref="tree=MeSH" title="MedGen record for EEG with intermittent slow activity">EEG with intermittent slow activity</a></span></li></ul></li><li><span class="TLline"><a href="/medgen/869262" ref="tree=MeSH" title="MedGen record for EEG with multifocal slow activity">EEG with multifocal slow activity</a></span></li></ul></li><li><span class="TLline"><a href="/medgen/869055" ref="tree=MeSH" title="MedGen record for EEG with changes in voltage">EEG with changes in voltage</a></span><ul><li><span class="TLline"><a href="/medgen/866859" ref="tree=MeSH" title="MedGen record for EEG with generalized low amplitude activity">EEG with generalized low amplitude activity</a></span></li><li><span class="TLline"><a href="/medgen/866858" ref="tree=MeSH" title="MedGen record for EEG with localized low amplitude activity">EEG with localized low amplitude activity</a></span></li></ul></li><li><span class="TLline"><a href="/medgen/869078" ref="tree=MeSH" title="MedGen record for EEG with constitutional variants">EEG with constitutional variants</a></span><ul><li><span class="TLline"><a href="/medgen/869076" ref="tree=MeSH" title="MedGen record for Alpha-EEG">Alpha-EEG</a></span></li><li><span class="TLline"><a href="/medgen/869077" ref="tree=MeSH" title="MedGen record for EEG with 4-5/second background activity">EEG with 4-5/second background activity</a></span></li><li><span class="TLline"><a href="/medgen/866861" ref="tree=MeSH" title="MedGen record for EEG with persistent abnormal rhythmic activity">EEG with persistent abnormal rhythmic activity</a></span></li><li><span class="TLline"><a href="/medgen/342079" ref="tree=MeSH" title="MedGen record for Low voltage EEG">Low voltage EEG</a></span></li></ul></li><li><span class="TLline"><a href="/medgen/869054" ref="tree=MeSH" title="MedGen record for EEG with diffuse acceleration">EEG with diffuse acceleration</a></span><ul><li><span class="TLline"><a href="/medgen/869075" ref="tree=MeSH" title="MedGen record for Beta-EEG">Beta-EEG</a></span><ul><li><span class="TLline"><a href="/medgen/869074" ref="tree=MeSH" title="MedGen record for Partial beta-EEG">Partial beta-EEG</a></span></li></ul></li></ul></li><li><span class="TLline"><a href="/medgen/765735" ref="tree=MeSH" title="MedGen record for EEG with photoparoxysmal response">EEG with photoparoxysmal response</a></span><ul><li><span class="TLline"><a href="/medgen/869046" ref="tree=MeSH" title="MedGen record for EEG with photoparoxysmal response grade I">EEG with photoparoxysmal response grade I</a></span></li><li><span class="TLline"><a href="/medgen/869045" ref="tree=MeSH" title="MedGen record for EEG with photoparoxysmal response grade II">EEG with photoparoxysmal response grade II</a></span></li><li><span class="TLline"><a href="/medgen/869044" ref="tree=MeSH" title="MedGen record for EEG with photoparoxysmal response grade III">EEG with photoparoxysmal response grade III</a></span></li><li><span class="TLline"><a href="/medgen/869043" ref="tree=MeSH" title="MedGen record for EEG with photoparoxysmal response grade IV">EEG with photoparoxysmal response grade IV</a></span></li></ul></li><li><span class="TLline"><a href="/medgen/1377364" ref="tree=MeSH" title="MedGen record for Interictal EEG abnormality">Interictal EEG abnormality</a></span><ul><li><span class="TLline"><a href="/medgen/1612377" ref="tree=MeSH" title="MedGen record for Absent posterior alpha rhythm">Absent posterior alpha rhythm</a></span></li><li><span class="TLline"><a href="/medgen/812733" ref="tree=MeSH" title="MedGen record for Continuous spike and waves during slow sleep">Continuous spike and waves during slow sleep</a></span></li><li><span class="TLline"><a href="/medgen/1617724" ref="tree=MeSH" title="MedGen record for Increased theta frequency activity in EEG">Increased theta frequency activity in EEG</a></span></li><li><span class="TLline"><a href="/medgen/869073" ref="tree=MeSH" title="MedGen record for Interictal epileptiform activity">Interictal epileptiform activity</a></span><ul><li><span class="TLline"><a href="/medgen/866845" ref="tree=MeSH" title="MedGen record for EEG with focal epileptiform discharges">EEG with focal epileptiform discharges</a></span></li><li><span class="TLline"><a href="/medgen/869058" ref="tree=MeSH" title="MedGen record for EEG with generalized epileptiform discharges">EEG with generalized epileptiform discharges</a></span></li><li><span class="TLline"><a href="/medgen/869258" ref="tree=MeSH" title="MedGen record for EEG with hyperventilation-induced epileptiform discharges">EEG with hyperventilation-induced epileptiform discharges</a></span></li><li><span class="TLline"><a href="/medgen/1783984" ref="tree=MeSH" title="MedGen record for Fixation-off epileptiform discharges">Fixation-off epileptiform discharges</a></span></li></ul></li><li><span class="TLline"><a href="/medgen/335892" ref="tree=MeSH" title="MedGen record for Normal interictal EEG">Normal interictal EEG</a></span></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></li></ul></div></div></div></div>
</div>
<div class="portlet mgSection" id="ID_112">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Conditions_with_this_feature">Conditions with this feature</h1><a sid="112" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln clinfeat">
<div class="divPopper rprt" id="rdis_13966"><div><strong>Autism</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>13966</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.">C0004352</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Autism, the prototypic pervasive developmental disorder (PDD), is usually apparent by 3 years of age. It is characterized by a triad of limited or absent verbal communication, a lack of reciprocal social interaction or responsiveness, and restricted, stereotypic, and ritualized patterns of interests and behavior (Bailey et al., 1996; Risch et al., 1999). 'Autism spectrum disorder,' sometimes referred to as ASD, is a broader phenotype encompassing the less severe disorders Asperger syndrome (see ASPG1; 608638) and pervasive developmental disorder, not otherwise specified (PDD-NOS). 'Broad autism phenotype' includes individuals with some symptoms of autism, but who do not meet the full criteria for autism or other disorders. Mental retardation coexists in approximately two-thirds of individuals with ASD, except for Asperger syndrome, in which mental retardation is conspicuously absent (Jones et al., 2008). Genetic studies in autism often include family members with these less stringent diagnoses (Schellenberg et al., 2006).&#13; Levy et al. (2009) provided a general review of autism and autism spectrum disorder, including epidemiology, characteristics of the disorder, diagnosis, neurobiologic hypotheses for the etiology, genetics, and treatment options.&#13; Genetic Heterogeneity of Autism&#13; Autism is considered to be a complex multifactorial disorder involving many genes. Accordingly, several loci have been identified, some or all of which may contribute to the phenotype. Included in this entry is AUTS1, which has been mapped to chromosome 7q22.&#13; Other susceptibility loci include AUTS3 (608049), which maps to chromosome 13q14; AUTS4 (608636), which maps to chromosome 15q11; AUTS6 (609378), which maps to chromosome 17q11; AUTS7 (610676), which maps to chromosome 17q21; AUTS8 (607373), which maps to chromosome 3q25-q27; AUTS9 (611015), which maps to chromosome 7q31; AUTS10 (611016), which maps to chromosome 7q36; AUTS11 (610836), which maps to chromosome 1q41; AUTS12 (610838), which maps to chromosome 21p13-q11; AUTS13 (610908), which maps to chromosome 12q14; AUTS14A (611913), which has been found in patients with a deletion of a region of 16p11.2; AUTS14B (614671), which has been found in patients with a duplication of a region of 16p11.2; AUTS15 (612100), associated with mutation in the CNTNAP2 gene (604569) on chromosome 7q35-q36; AUTS16 (613410), associated with mutation in the SLC9A9 gene (608396) on chromosome 3q24; AUTS17 (613436), associated with mutation in the SHANK2 gene (603290) on chromosome 11q13; AUTS18 (615032), associated with mutation in the CHD8 gene (610528) on chromosome 14q11; AUTS19 (615091), associated with mutation in the EIF4E gene (133440) on chromosome 4q23; and AUTS20 (618830), associated with mutation in the NLGN1 gene (600568) on chromosome 3q26. (NOTE: the symbol 'AUTS2' has been used to refer to a gene on chromosome 7q11 (KIAA0442; 607270) and therefore is not used as a part of this autism locus series.)&#13; There are several X-linked forms of autism susceptibility: AUTSX1 (300425), associated with mutations in the NLGN3 gene (300336); AUTSX2 (300495), associated with mutations in NLGN4 (300427); AUTSX3 (300496), associated with mutations in MECP2 (300005); AUTSX4 (300830), associated with variation in the region on chromosome Xp22.11 containing the PTCHD1 gene (300828); AUTSX5 (300847), associated with mutations in the RPL10 gene (312173); and AUTSX6 (300872), associated with mutation in the TMLHE gene (300777).&#13; A locus on chromosome 2q (606053) associated with a phenotype including intellectual disability and speech deficits was formerly designated AUTS5.&#13; Folstein and Rosen-Sheidley (2001) reviewed the genetics of autism.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/13966">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_44131"><div><strong>Galactosylceramide beta-galactosidase deficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>44131</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.">C0023521</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Krabbe disease comprises a spectrum ranging from infantile-onset disease (i.e., onset of extreme irritability, spasticity, and developmental delay before age 12 months) to later-onset disease (i.e., onset of manifestations after age 12 months and as late as the seventh decade). Although historically 85%-90% of symptomatic individuals with Krabbe disease diagnosed by enzyme activity alone have infantile-onset Krabbe disease and 10%-15% have later-onset Krabbe disease, the experience with newborn screening (NBS) suggests that the proportion of individuals with possible later-onset Krabbe disease is higher than previously thought. Infantile-onset Krabbe disease is characterized by normal development in the first few months followed by rapid severe neurologic deterioration; the average age of death is 24 months (range 8 months to 9 years). Later-onset Krabbe disease is much more variable in its presentation and disease course.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/44131">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_48441"><div><strong>Rett syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>48441</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.">C0035372</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">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.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/48441">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_48574"><div><strong>Schizophrenia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>48574</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.">C0036341</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Schizophrenia is highly heritable, as shown by family, twin, and adoption studies. For example, for identical twins, if one twin develops schizophrenia, the other twin has about a 50% chance of also developing the disease. The risk of the general population developing the schizophrenia is about 0.3-0.7% worldwide. The search for “schizophrenia genes” has been elusive. Initial linkage studies looked at parts of the genome associated with schizophrenia, and many candidate genes were identified, including APOE, COMT, DAO, DRD1, DRD2, DRD4, DTNBP1, GABRB2, GRIN2B, HP, IL1B, MTHFR, PLXNA2, SLC6A4, TP53, and TPH1. However, some of these have later been questioned. Microdeletions and microduplications have been found to be three times more common in individuals with schizophrenia, compared to controls. Because these deletions and duplications are in genes that are overexpressed in pathways related to brain development, it is possible that the inheritance of multiple rare variants may contribute to the development of schizophrenia. Several genetic disorders feature schizophrenia as a clinical feature. The 22q11.2 Deletion Syndrome comprises many different syndromes, of which one of the most serious is DiGeorge syndrome. Children born with DiGeorge syndrome typically have heart defects, cleft palate, learning difficulties, and immune deficiency. Schizophrenia is a late manifestation, affecting around 30% of individuals. Microdeletions and duplications in chromosome 1, 2, 3, 7, 15 and 16 have also been associated with schizophrenia. In 2014, a genome-wide association study looked at the genomes of over 35,000 patients and 110,00 controls. The study identified 108 SNPs that were associated with schizophrenia, 83 of which had not been previously reported. As expected, many of these loci occurred in genes that are expressed in the brain. For example, the SNPs included a gene that encodes the dopamine D2 receptor, DRD2 (the target of antipsychotic drugs), and many genes involved in glutamine neurotransmitter pathways and synaptic plasticity (e.g., GRM3, GRIN2A, SRR, GRIA1). More surprisingly, however, associations were also enriched among genes expressed in tissues with important immune functions. In 2016, a study based on nearly 65,000 people investigated the association between schizophrenia and variation in the Major Histocompatibility Complex (MHC) locus—a region on chromosome 6 that is important for immune function. The study focused on the C4 gene (complement component 4) that exists as two distinct genes: C4A and C4B, which encode particularly structurally diverse alleles. The study found that the alleles which promoted greater expression of C4A in the brain were associated with a greater risk of schizophrenia. By using mice models, the study showed that C4 is involved in the elimination of synapses during brain maturation. In humans, “synaptic pruning” is most active during late adolescence, which coincides with the typical onset of symptoms of schizophrenia. It is therefore possible that the inheritance of specific C4A alleles could lead to “run away” synaptic pruning, increasing the risk of schizophrenia. Further research may even determine C4 as a potential therapeutic target.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/48574">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_58144"><div><strong>Angelman syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>58144</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:">C0162635</span></a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Angelman syndrome (AS) is characterized by severe developmental delay or intellectual disability, severe speech impairment, gait ataxia and/or tremulousness of the limbs, and unique behavior with an apparent happy demeanor that includes frequent laughing, smiling, and excitability. Microcephaly and seizures are also common. Developmental delays are first noted at around age six months; however, the unique clinical features of AS do not become manifest until after age one year.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/58144">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_78557"><div><strong>Borjeson-Forssman-Lehmann syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>78557</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.">C0265339</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Borjeson-Forssman-Lehmann syndrome (BFLS) is an uncommon X-linked intellectual developmental disorder that evolves with age. Clinical manifestations in males are quite variable, with the most consistent features being initial hypotonia, mild to moderate impaired intellectual development, large fleshy ears, underdeveloped genitalia, gynecomastia, truncal obesity, tapering fingers, and shortening of the fourth and fifth toes. Heterozygous females may have a milder similar clinical phenotype, which can include hypothyroidism; however, many carrier females appear unaffected (summary by Crawford et al., 2006).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/78557">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_120645"><div><strong>Proline dehydrogenase deficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>120645</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.">C0268529</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Phang et al. (2001) noted that prospective studies of HPI probands identified through newborn screening as well as reports of several families have suggested that it is a metabolic disorder not clearly associated with clinical manifestations. Phang et al. (2001) concluded that HPI is a relatively benign condition in most individuals under most circumstances. However, other reports have suggested that some patients have a severe phenotype with neurologic manifestations, including epilepsy and impaired intellectual development (Jacquet et al., 2003).&#13; Genetic Heterogeneity of Hyperprolinemia&#13; See also hyperprolinemia type II (HYRPRO2; 239510), which is caused by mutation in the gene encoding pyrroline-5-carboxylate dehydrogenase (P5CDH, ALDH4A1; 606811) on chromosome 1p36.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/120645">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_75693"><div><strong>Saccharopinuria</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>75693</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.">C0268556</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Saccharopinuria, also known as hyperlysinemia type II, is an autosomal recessive metabolic condition with few, if any, clinical manifestations. Hyperlysinemia type II and hyperlysinemia type I (238700) both result from deficiency of the bifunctional enzyme AASS (605113) on chromosome 7q31. The AASS gene encodes lysine alpha-ketoglutarate reductase and saccharopine dehydrogenase, which catalyze, respectively, the sequential conversion of lysine to saccharopine and saccharopine to alpha-aminoadipic semialdehyde and glutamate (summary by Tondo et al., 2013). In hyperlysinemia type I, both enzymatic functions of AASS are defective and patients have increased serum lysine and possibly increased saccharopine; in hyperlysinemia type II, most of the first enzymatic function is retained, and patients tend to have isolated saccharopine increase (Cox, 1985; Cox et al., 1986).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/75693">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_78692"><div><strong>Deficiency of hydroxymethylglutaryl-CoA lyase</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>78692</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.">C0268601</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">3-Hydroxy-3-methylglutaryl-CoA lyase deficiency (HMGCLD) is a rare autosomal recessive disorder with the cardinal manifestations of metabolic acidosis without ketonuria, hypoglycemia, and a characteristic pattern of elevated urinary organic acid metabolites, including 3-hydroxy-3-methylglutaric, 3-methylglutaric, and 3-hydroxyisovaleric acids. Urinary levels of 3-methylcrotonylglycine may be increased. Dicarboxylic aciduria, hepatomegaly, and hyperammonemia may also be observed. Presenting clinical signs include irritability, lethargy, coma, and vomiting (summary by Gibson et al., 1988).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/78692">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_124340"><div><strong>Succinate-semialdehyde dehydrogenase deficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>124340</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.">C0268631</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Succinic semialdehyde dehydrogenase (SSADH) deficiency is characterized by a relatively non-progressive encephalopathy typically presenting with hypotonia and delayed acquisition of motor and language developmental milestones in the first two years of life. Common clinical features include an almost universal intellectual disability and adaptive function deficits, as well as epilepsy, autism spectrum disorder, movement disorders (such as ataxia, dystonia, and exertional dyskinesia), sleep disturbances, attention problems, anxiety, and obsessive-compulsive behaviors. Notably, seizures, autism spectrum disorder features, and behavioral problems tend to worsen around the time of late childhood or early adolescence. Affected individuals do not usually have episodic decompensation following metabolic stressors, as is typical of other organic acidemias and metabolic encephalopathies, although some have been diagnosed after having unanticipated difficulty recovering from otherwise ordinary childhood illnesses. Clinical presentation with acute onset of generalized hypotonia and choreiform movement following upper-respiratory tract infection has been observed.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/124340">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_75817"><div><strong>Reading seizure</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>75817</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.">C0278193</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A rare reflex epilepsy characterized by reading-induced seizures which in most cases present with orofacial/jaw myoclonus possibly extending to the upper limbs but can also manifest as dyslexia or alexia and visual symptoms. In both variants secondary generalized tonic-clonic seizures may evolve if the stimulus is not interrupted. The disease typically begins in the second or third decade of life and may be inherited in an autosomal dominant pattern. It usually takes a benign course with little tendency to spontaneous seizures.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/75817">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_98034"><div><strong>GAPO syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>98034</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.">C0406723</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">GAPO syndrome is the acronymic designation for a complex of growth retardation, alopecia, pseudoanodontia (failure of tooth eruption), and progressive optic atrophy (Tipton and Gorlin, 1984). Ilker et al. (1999) and Bayram et al. (2014) noted that optic atrophy is not a consistent feature of the disorder.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/98034">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_162881"><div><strong>Smith-Magenis syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>162881</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.">C0795864</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Smith-Magenis syndrome (SMS) is characterized by distinctive physical features (particularly coarse facial features that progress with age), developmental delay, cognitive impairment, behavioral abnormalities, sleep disturbance, and childhood-onset abdominal obesity. Infants have feeding difficulties, failure to thrive, hypotonia, hyporeflexia, prolonged napping or need to be awakened for feeds, and generalized lethargy. The majority of individuals function in the mild-to-moderate range of intellectual disability. The behavioral phenotype, including significant sleep disturbance, stereotypies, and maladaptive and self-injurious behaviors, is generally not recognized until age 18 months or older and continues to change until adulthood. Sensory issues are frequently noted; these may include avoidant behavior, as well as repetitive seeking of textures, sounds, and experiences. Toileting difficulties are common. Significant anxiety is common as are problems with executive functioning, including inattention, distractibility, hyperactivity, and impulsivity. Maladaptive behaviors include frequent outbursts / temper tantrums, attention-seeking behaviors, opposition, aggression, and self-injurious behaviors including self-hitting, self-biting, skin picking, inserting foreign objects into body orifices (polyembolokoilamania), and yanking fingernails and/or toenails (onychotillomania). Among the stereotypic behaviors described, the spasmodic upper-body squeeze or "self-hug" seems to be highly associated with SMS. An underlying developmental asynchrony, specifically emotional maturity delayed beyond intellectual functioning, may also contribute to maladaptive behaviors in people with SMS.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/162881">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_163228"><div><strong>Worster-Drought syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>163228</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.">C0796204</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A form of cerebral palsy with characteristics of congenital pseudobulbar (suprabulbar) paresis manifesting as selective weakness of the lips, tongue and soft palate, dysphagia, dysphonia, drooling and jaw jerking. Mean age at diagnosis is 6 years. The main clinical features are spasticity and limited movements around the mouth and throat from an early age, and brisk jaw jerks. Most cases are sporadic but several families with more than one affected member have been reported. Inheritance in these families appeared to follow an autosomal dominant pattern with variable expression and penetrance.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/163228">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_163237"><div><strong>Partington syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>163237</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.">C0796250</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Partington syndrome (PRTS) is an X-linked developmental disorder characterized by impaired intellectual development and variable movement disturbances. Partington syndrome is part of a phenotypic spectrum of disorders caused by mutation in the ARX gene comprising a nearly continuous series of developmental disorders ranging from hydranencephaly and lissencephaly (LISX2; 300215) to Proud syndrome (300004) to infantile spasms without brain malformations (see 308350) to nonsyndromic intellectual disability (300419). Although males with ARX mutations are often more severely affected, female mutation carriers may also be affected (Kato et al., 2004; Wallerstein et al., 2008).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/163237">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_324635"><div><strong>Intellectual disability with optic atrophy, facial dysmorphism, microcephaly, and short stature</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>324635</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.">C1836915</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/324635">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_324784"><div><strong>Congenital disorder of glycosylation type 1E</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>324784</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.">C1837396</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Congenital disorders of glycosylation (CDGs) are metabolic deficiencies in glycoprotein biosynthesis that usually cause severe mental and psychomotor retardation. Different forms of CDGs can be recognized by altered isoelectric focusing (IEF) patterns of serum transferrin.&#13; For a discussion of the classification of CDGs, see CDG Ia (212065).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/324784">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_374004"><div><strong>Neuronal ceroid lipofuscinosis 8</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>374004</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.">C1838570</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The neuronal ceroid lipofuscinoses (NCL; CLN) are a clinically and genetically heterogeneous group of neurodegenerative disorders characterized by the intracellular accumulation of autofluorescent lipopigment storage material in different patterns ultrastructurally. The lipopigment patterns observed most often in CLN8 comprise mixed combinations of 'granular,' 'curvilinear,' and 'fingerprint' profiles (Mole et al., 2005).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of CLN, see CLN1 (256730).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/374004">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_325457"><div><strong>Neuronal ceroid lipofuscinosis 7</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>325457</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.">C1838571</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The neuronal ceroid lipofuscinoses (NCL, or CLN) are a clinically and genetically heterogeneous group of neurodegenerative disorders characterized by the intracellular accumulation of autofluorescent lipopigment storage material in different patterns ultrastructurally (summary by Mole et al., 2005).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of CLN, see CLN1 (256730).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/325457">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_330866"><div><strong>Childhood onset GLUT1 deficiency syndrome 2</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>330866</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.">C1842534</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Glucose transporter type 1 deficiency syndrome (Glut1DS) is a disorder of brain energy metabolism. Glucose, the essential metabolic fuel for the brain, is transported into the brain exclusively by the protein glucose transporter type 1 (Glut1) across the endothelial cells forming the blood-brain barrier (BBB). Glut1DS results from the inability of Glut1 to transfer sufficient glucose across the BBB to meet the glucose demands of the brain. The needs of the brain for glucose increase rapidly after birth, peaking in early childhood, remaining high until about age 10 years, then gradually decreasing throughout adolescence and plateauing in early adulthood. When first diagnosed in infancy to early childhood, the predominant clinical findings of Glut1DS are paroxysmal eye-head movements, pharmacoresistant seizures of varying types, deceleration of head growth, and developmental delay. Subsequently children develop complex movement disorders and intellectual disability ranging from mild to severe. Institution of ketogenic diet therapies (KDTs) helps with early neurologic growth and development and seizure control. Typically, the earlier the treatment the better the long-term clinical outcome. When first diagnosed in later childhood to adulthood (occasionally in a parent following the diagnosis of an affected child), the predominant clinical findings of Glut1DS are usually complex paroxysmal movement disorders, spasticity, ataxia, dystonia, speech difficulty, and intellectual disability.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/330866">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_334211"><div><strong>Autism, susceptibility to, 3</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>334211</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.">C1842632</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Autism, the prototypic pervasive developmental disorder (PDD), is usually apparent by 3 years of age. It is characterized by a triad of limited or absent verbal communication, a lack of reciprocal social interaction or responsiveness, and restricted, stereotypic, and ritualized patterns of interests and behavior (Bailey et al., 1996; Risch et al., 1999). 'Autism spectrum disorder,' sometimes referred to as ASD, is a broader phenotype encompassing the less severe disorders Asperger syndrome (see ASPG1; 608638) and pervasive developmental disorder, not otherwise specified (PDD-NOS). 'Broad autism phenotype' includes individuals with some symptoms of autism, but who do not meet the full criteria for autism or other disorders. Impaired intellectual development coexists in approximately two-thirds of individuals with ASD, except for Asperger syndrome, in which impaired intellectual development is conspicuously absent (Jones et al., 2008). Genetic studies in autism often include family members with these less stringent diagnoses (Schellenberg et al., 2006).&#13; For a discussion of genetic heterogeneity of autism, see 209850.&#13; See also chromosome 13q14 deletion syndrome (613884), in which retinoblastoma and impaired intellectual development are features.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/334211">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_337201"><div><strong>Intellectual disability, X-linked 82</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>337201</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.">C1845286</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/337201">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_335161"><div><strong>Autism, susceptibility to, X-linked 3</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>335161</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.">C1845336</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">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.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/335161">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_336964"><div><strong>Autism, susceptibility to, X-linked 2</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>336964</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.">C1845539</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Autism, the prototypic pervasive developmental disorder (PDD), is usually apparent by 3 years of age. It is characterized by a triad of limited or absent verbal communication, a lack of reciprocal social interaction or responsiveness, and restricted, stereotypic, and ritualized patterns of interests and behavior (Bailey et al., 1996; Risch et al., 1999). 'Autism spectrum disorder,' sometimes referred to as ASD, is a broader phenotype encompassing the less severe disorders Asperger syndrome (see ASPG1; 608638) and pervasive developmental disorder, not otherwise specified (PDD-NOS). 'Broad autism phenotype' includes individuals with some symptoms of autism, but who do not meet the full criteria for autism or other disorders. Impaired intellectual development coexists in approximately two-thirds of individuals with ASD, except for Asperger syndrome, in which intellectual disability is conspicuously absent (Jones et al., 2008). Genetic studies in autism often include family members with these less stringent diagnoses (Schellenberg et al., 2006).&#13; For a discussion of genetic heterogeneity of autism, see 209850.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/336964">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_335205"><div><strong>Autism, susceptibility to, X-linked 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>335205</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.">C1845540</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Autism, the prototypic pervasive developmental disorder (PDD), is usually apparent by 3 years of age. It is characterized by a triad of limited or absent verbal communication, a lack of reciprocal social interaction or responsiveness, and restricted, stereotypic, and ritualized patterns of interests and behavior (Bailey et al., 1996; Risch et al., 1999). 'Autism spectrum disorder,' sometimes referred to as ASD, is a broader phenotype encompassing the less severe disorders Asperger syndrome (see ASPG1; 608638) and pervasive developmental disorder, not otherwise specified (PDD-NOS). 'Broad autism phenotype' includes individuals with some symptoms of autism, but who do not meet the full criteria for autism or other disorders. Mental retardation coexists in approximately two-thirds of individuals with ASD, except for Asperger syndrome, in which mental retardation is conspicuously absent (Jones et al., 2008). Genetic studies in autism often include family members with these less stringent diagnoses (Schellenberg et al., 2006).&#13; For a discussion of genetic heterogeneity of autism, see 209850.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/335205">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_342403"><div><strong>Hypomyelinating leukodystrophy 3</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>342403</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.">C1850053</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hypomyelinating leukodystrophy-3 (HLD3) is an autosomal recessive severe neurologic disorder characterized by early infantile onset of global developmental delay, lack of development, lack of speech acquisition, and peripheral spasticity associated with decreased myelination in the central nervous system (summary by Feinstein et al., 2010).&#13; The disorder is phenotypically similar to X-linked Pelizaeus-Merzbacher disease (PMD; 312080), which is caused by mutation in the PLP1 gene (300401). For a general phenotypic description and a discussion of genetic heterogeneity of HLD, see 312080.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/342403">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_340540"><div><strong>Neuronal ceroid lipofuscinosis 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>340540</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.">C1850451</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The neuronal ceroid lipofuscinoses (NCL; CLN) are a clinically and genetically heterogeneous group of neurodegenerative disorders characterized by the intracellular accumulation of autofluorescent lipopigment storage material in different patterns ultrastructurally. The lipopigment pattern seen most often in CLN1 is referred to as granular osmiophilic deposits (GROD). The patterns most often observed in CLN2 and CLN3 are 'curvilinear' and 'fingerprint' profiles, respectively. CLN4, CLN5, CLN6, CLN7, and CLN8 show mixed combinations of granular, curvilinear, fingerprint, and rectilinear profiles. The clinical course includes progressive dementia, seizures, and progressive visual failure (Mole et al., 2005).&#13; Zeman and Dyken (1969) referred to these conditions as the 'neuronal ceroid lipofuscinoses.' Goebel (1995) provided a comprehensive review of the NCLs and noted that they are possibly the most common group of neurodegenerative diseases in children.&#13; Mole et al. (2005) provided a detailed clinical and genetic review of the neuronal ceroid lipofuscinoses.&#13; Genetic Heterogeneity of Neuronal Ceroid Lipofuscinosis&#13; See also CLN2 (204500), caused by mutation in the TPP1 gene (607998) on chromosome 11p15; CLN3 (204200), caused by mutation in the CLN3 gene (607042) on 16p12; CLN4 (162350), caused by mutation in the DNAJC5 gene (611203) on 20q13; CLN5 (256731), caused by mutation in the CLN5 gene (608102) on 13q22; CLN6A (601780) and CLN6B (204300), both caused by mutation in the CLN6 gene (606725) on 15q21; CLN7 (610951), caused by mutation in the MFSD8 gene (611124) on 4q28; CLN8 (600143) and the Northern epilepsy variant of CLN8 (610003), both caused by mutation in the CLN8 gene (607837) on 8p23; CLN10 (610127), caused by mutation in the CTSD gene (116840) on 11p15; CLN11 (614706), caused by mutation in the GRN gene (138945) on 17q21; CLN13 (615362), caused by mutation in the CTSF gene (603539) on 11q13; and CLN14 (611726), caused by mutation in the KCTD7 gene (611725) on 7q11.&#13; CLN9 (609055) has not been molecularly characterized.&#13; A disorder that was formerly designated neuronal ceroid lipofuscinosis-12 (CLN12) is now considered to be a variable form of Kufor-Rakeb syndrome (KRS; 606693).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/340540">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_377052"><div><strong>Self-limited childhood occipital epilepsy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>377052</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.">C1851549</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A rare genetic neurological disorder with characteristics of visual seizures and occipital epileptiform paroxysms reactive to ocular opening which present in infancy to mid-adolescence. Vomiting, tonic eye deviation and impairment of consciousness are typically associated with the Panayiotopoulos type, while visual hallucinations, ictal blindness and post-ictal headache are commonly observed in the Gastaut type. Electroencephalographic findings in both types are similar and include bilateral, synchronous, high voltage spike-wave complexes in a normal background activity located predominantly in the occipital lobes.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/377052">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_343646"><div><strong>Electroencephalographic peculiarity: fronto-precentral beta wave groups</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>343646</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.">C1851756</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/343646">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_377516"><div><strong>Electroencephalographic peculiarity: 14 and 6 per sec. positive spike phenomenon</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>377516</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.">C1851757</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/377516">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_342798"><div><strong>Cerebrooculofacioskeletal syndrome 4</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>342798</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.">C1853100</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Cerebrooculofacioskeletal syndrome-4 (COFS4) is a severe autosomal recessive disorder characterized by growth retardation, dysmorphic facial features, arthrogryposis, and neurologic abnormalities. Cellular studies show a defect in both transcription-coupled and global genome nucleotide excision repair (TC-NER and GG-NER) (summary by Jaspers et al., 2007 and Kashiyama et al., 2013).&#13; For a discussion of genetic heterogeneity of cerebrooculofacioskeletal syndrome, see 214150.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/342798">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_346929"><div><strong>Microcephaly 2, primary, autosomal recessive, with or without cortical malformations</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>346929</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.">C1858535</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">In WDR62 primary microcephaly (WDR62-MCPH), microcephaly (occipitofrontal circumference [OFC] =2 standard deviations below the mean) is usually present at birth, but in some instances becomes evident later in the first year of life. Growth is otherwise normal. Except for brain malformations in most affected individuals, no other congenital malformations are observed. Central nervous system involvement can include delayed motor development, mild-to-severe intellectual disability (ID), behavior problems, epilepsy, spasticity, and ataxia.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/346929">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_355328"><div><strong>Neuronal ceroid lipofuscinosis 8 northern epilepsy variant</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>355328</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.">C1864923</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The neuronal ceroid lipofuscinoses (NCL; CLN) are a clinically and genetically heterogeneous group of neurodegenerative disorders characterized by the intracellular accumulation of autofluorescent lipopigment storage material in different patterns ultrastructurally. The lipopigment patterns observed most often in CLN8 comprise mixed combinations of 'granular,' 'curvilinear,' and 'fingerprint' profiles (Mole et al., 2005).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of CLN, see CLN1 (256730).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/355328">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_408255"><div><strong>4p partial monosomy syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>408255</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.">C1956097</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Wolf-Hirschhorn syndrome is a congenital malformation syndrome characterized by pre- and postnatal growth deficiency, developmental disability of variable degree, characteristic craniofacial features ('Greek warrior helmet' appearance of the nose, high forehead, prominent glabella, hypertelorism, high-arched eyebrows, protruding eyes, epicanthal folds, short philtrum, distinct mouth with downturned corners, and micrognathia), and a seizure disorder (Battaglia et al., 2008).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/408255">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_409616"><div><strong>Severe neonatal-onset encephalopathy with microcephaly</strong><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></div>
<div class="spaceAbove">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.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/409616">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_409897"><div><strong>Autism, susceptibility to, 8</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>409897</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.">C1969710</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Autism, the prototypic pervasive developmental disorder (PDD), is usually apparent by 3 years of age. It is characterized by a triad of limited or absent verbal communication, a lack of reciprocal social interaction or responsiveness, and restricted, stereotypical, and ritualized patterns of interests and behavior (Bailey et al., 1996; Risch et al., 1999). 'Autism spectrum disorder,' sometimes referred to as ASD, is a broader phenotype encompassing the less severe disorders Asperger syndrome (see ASPG1; 608638) and pervasive developmental disorder, not otherwise specified (PDD-NOS). 'Broad autism phenotype' includes individuals with some symptoms of autism, but who do not meet the full criteria for autism or other disorders. Mental retardation coexists in approximately two-thirds of individuals with ASD, except for Asperger syndrome, in which mental retardation is conspicuously absent (Jones et al., 2008). Genetic studies in autism often include family members with these less stringent diagnoses (Schellenberg et al., 2006).&#13; For a discussion of genetic heterogeneity of autism, see 209850.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/409897">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_390767"><div><strong>15q11q13 microduplication syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>390767</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.">C2675336</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Maternal 15q duplication syndrome (maternal dup15q) is characterized by hypotonia and motor delays, intellectual disability, autism spectrum disorder (ASD), and epilepsy including infantile spasms. Rarely, maternal dup15q may also be associated with psychosis or sudden unexplained death. Those with a maternal isodicentric 15q11.2-q13.1 supernumerary chromosome are typically more severely affected than those with an interstitial duplication.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/390767">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_382611"><div><strong>Intellectual disability, autosomal dominant 5</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>382611</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.">C2675473</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">SYNGAP1-related intellectual disability (SYNGAP1-ID) is characterized by developmental delay (DD) or intellectual disability (ID) (100% of affected individuals), generalized epilepsy (~84%), and autism spectrum disorder (ASD) and other behavioral abnormalities (=50%). To date more than 50 individuals with SYNGAP1-ID have been reported. In the majority DD/ID was moderate to severe; in some it was mild. The epilepsy is generalized; a subset of individuals with epilepsy have myoclonic astatic epilepsy (Doose syndrome) or epilepsy with myoclonic absences. Behavioral abnormalities can include stereotypic behaviors (e.g., hand flapping, obsessions with certain objects) as well as poor social development. Feeding difficulties can be significant in some.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/382611">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_390902"><div><strong>Chromosome 2p16.1-p15 deletion syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>390902</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.">C2675875</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Chromosome 2p16.1-p15 deletion syndrome is a neurodevelopmental disorder characterized by delayed psychomotor development, intellectual disability, and variable but distinctive dysmorphic features, including microcephaly, bitemporal narrowing, smooth and long philtrum, hypertelorism, downslanting palpebral fissures, broad nasal root, thin upper lip, and high palate. Many patients have behavioral disorders, including autistic features, as well as structural brain abnormalities, such as pachygyria or hypoplastic corpus callosum. Those with deletions including the BCL11A gene (606557) also have persistence of fetal hemoglobin (HbF), which is asymptomatic and does not affected hematologic parameters or susceptibility to infection (summary by Funnell et al., 2015).&#13; Point mutation in the BCL11A gene causes intellectual developmental disorder with persistence of fetal hemoglobin (617101), which shows overlapping features.&#13; See also fetal hemoglobin quantitative trait locus-5 (HBFQTL5; 142335).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/390902">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_440690"><div><strong>Chromosome Xp11.23-p11.22 duplication syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>440690</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.">C2749022</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Familial and &lt;i&gt;de novo&lt;/i&gt; recurrent Xp11.22-p11.23 microduplication has been recently identified in males and females.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/440690">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_413258"><div><strong>Cortical dysplasia-focal epilepsy syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>413258</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.">C2750246</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Pitt-Hopkins-like syndrome-1 (PTHSL1) is an autosomal recessive neurodevelopmental disorder characterized by delayed psychomotor development, intellectual disability, severe speech impairment or regression, and behavioral abnormalities. Most patients have onset of seizures within the first years of life. Some patients may have cortical dysplasia on brain imaging (summary by Smogavec et al., 2016).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/413258">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_416638"><div><strong>Immunodeficiency 83, susceptibility to viral infections</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>416638</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.">C2751803</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Immunodeficiency-83 (IMD83) is characterized by increased susceptibility to severe viral infections, including herpes simplex virus (HSV), varicella zoster virus (VZV), influenza A virus (IAV), hantavirus, and possibly respiratory syncytial virus (RSV). The age at onset varies widely from infancy to adulthood, and there is incomplete penetrance. The susceptibility to encephalitis or pneumonitis appears to result from impaired TLR3-dependent interferon production by nonhematopoietic cells that reside within the central nervous system (CNS) or lung epithelial cells (review by Zhang et al., 2013; summary by Mork et al., 2015; Sironi et al., 2017, Lim et al., 2019, Partanen et al., 2020).&#13; For a general phenotypic description of herpes simplex encephalitis (HSE) and a discussion of genetic heterogeneity of acute infection-induced encephalopathy, see 610551.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/416638">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_443944"><div><strong>Odontotrichomelic syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>443944</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.">C2930960</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A rare genetic disease characterized by intellectual disability, growth delay, absence deformities of upper and lower limbs, hypotrichosis, hypoplastic nails, abnormal dentition, abnormal auricles, hypoplastic nipples, thyroid enlargement, and abnormalities of tyrosine and/or tryptophane metabolism. Hypogonadism and cleft lip have also been reported. No new cases have been confirmed since 1970.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/443944">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_444010"><div><strong>Potocki-Lupski syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>444010</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.">C2931246</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Potocki-Lupski syndrome (PTLS) is characterized by cognitive, behavioral, and medical manifestations. Cognitively, most individuals present with developmental delay, later meeting criteria for moderate intellectual disability. Behaviorally, issues with attention, hyperactivity, withdrawal, and anxiety may be seen. Some individuals meet criteria for autism spectrum disorder. Medically, hypotonia, oropharyngeal dysphagia leading to failure to thrive, congenital heart disease, hypoglycemia associated with growth hormone deficiency, and mildly dysmorphic facial features are observed. Medical manifestations typically lead to identification of PTLS in infancy; however, those with only behavioral and cognitive manifestations may be identified in later childhood.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/444010">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_462055"><div><strong>Rett syndrome, congenital variant</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>462055</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.">C3150705</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">FOXG1 syndrome is characterized by moderate-to-profound developmental delay and intellectual disability, postnatal growth deficiency, congenital or postnatal microcephaly, hyperkinetic/dyskinetic movement disorder, hypotonia, neurobehavioral/psychiatric manifestations (motor stereotypies, impairment of social interaction, abnormal sleep patterns, unexplained episodes of crying, restlessness, and bruxism), feeding difficulties with poor weight gain, strabismus, seizures, spasticity, gastroesophageal reflux, and aspiration. Some individuals have cortical visual impairment, kyphosis, scoliosis, and/or abnormal breathing. Characteristic neuroimaging findings include corpus callosum anomalies (especially a marked, filiform thinning of the rostrum of the corpus callosum), a simplified gyral pattern, and hyperplasia of the fornices.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/462055">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_462761"><div><strong>Intellectual disability, autosomal dominant 6</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>462761</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.">C3151411</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">GRIN2B-related neurodevelopmental disorder is characterized by mild to profound developmental delay / intellectual disability (DD/ID) in all affected individuals. Muscle tone abnormalities (spasticity and/or hypotonia, occasionally associated with feeding difficulties), as well as epilepsy and autism spectrum disorder (ASD) / behavioral issues, are common. Other infantile- or childhood-onset findings include microcephaly; dystonic, dyskinetic, or choreiform movement disorder; and/or cortical visual impairment. Brain MRI reveals a malformation of cortical development in a minority of affected individuals. To date, fewer than 100 individuals with GRIN2B-related neurodevelopmental disorder have been reported.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/462761">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_462869"><div><strong>Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A3</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>462869</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.">C3151519</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">An autosomal recessive muscular dystrophy caused by mutations in the POMGNT1 gene. It is associated with characteristic brain and eye malformations, profound mental retardation, and death usually in the first years of life.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/462869">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_481505"><div><strong>Occipital pachygyria and polymicrogyria</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>481505</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.">C3279875</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Occipital cortical malformations (OCCM) is an autosomal recessive condition in which affected individuals develop seizures, sometimes associated with transient visual changes. Brain MRI shows both pachygyria and polymicrogyria restricted to the lateral occipital lobes (summary by Barak et al., 2011).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/481505">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_481895"><div><strong>Intellectual disability, autosomal recessive 18</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>481895</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.">C3280265</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">MRT18 is an autosomal recessive disorder characterized by impaired intellectual development with or without epilepsy. Other features may include spasticity, congenital heart disease, brain abnormalities, and atypical electroencephalography (summary by Trehan et al., 2015).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/481895">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_481912"><div><strong>Intellectual disability, autosomal dominant 8</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>481912</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.">C3280282</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">GRIN1-related neurodevelopmental disorder (GRIN1-NDD) is characterized by mild-to-profound developmental delay / intellectual disability (DD/ID) in all affected individuals. Other common manifestations are epilepsy, muscular hypotonia, movement disorders, spasticity, feeding difficulties, and behavior issues. A subset of individuals show a malformation of cortical development consisting of extensive and diffuse bilateral polymicrogyria. To date, 72 individuals with GRIN1-NDD have been reported.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/481912">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_482082"><div><strong>Autosomal recessive spinocerebellar ataxia 12</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>482082</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.">C3280452</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive spinocerebellar ataxia-12 is a neurologic disorder characterized by onset of generalized seizures in infancy, delayed psychomotor development with mental retardation, and cerebellar ataxia. Some patients may also show spasticity (summary by Mallaret et al., 2014).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/482082">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_482685"><div><strong>Psychomotor retardation, epilepsy, and craniofacial dysmorphism</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>482685</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.">C3281055</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with hypotonia, craniofacial abnormalities, and seizures (NEDHCS) is an autosomal recessive syndrome characterized primarily by hypotonia and poor feeding apparent in early infancy. Affected individuals have severe global developmental delay, early-onset intractable seizures, and recognizable craniofacial dysmorphism with skull abnormalities. The disorder is believed to be unique to the Amish population, where it exhibits a founder effect (summary by Ammous et al., 2021).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/482685">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_762097"><div><strong>Mitochondrial complex III deficiency nuclear type 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>762097</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.">C3541471</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive mitochondrial complex III deficiency is a severe multisystem disorder with onset at birth of lactic acidosis, hypotonia, hypoglycemia, failure to thrive, encephalopathy, and delayed psychomotor development. Visceral involvement, including hepatopathy and renal tubulopathy, may also occur. Many patients die in early childhood, but some may show longer survival (de Lonlay et al., 2001; De Meirleir et al., 2003).&#13; Genetic Heterogeneity of Mitochondrial Complex III Deficiency&#13; Mitochondrial complex III deficiency can be caused by mutation in several different nuclear-encoded genes. See MC3DN2 (615157), caused by mutation in the TTC19 gene (613814) on chromosome 17p12; MC3DN3 (615158), caused by mutation in the UQCRB gene (191330) on chromosome 8q; MC3DN4 (615159), caused by mutation in the UQCRQ gene (612080) on chromosome 5q31; MC3DN5 (615160), caused by mutation in the UQCRC2 gene (191329) on chromosome 16p12; MC3DN6 (615453), caused by mutation in the CYC1 gene (123980) on chromosome 8q24; MC3DN7 (615824), caused by mutation in the UQCC2 gene (614461) on chromosome 6p21; MC3DN8 (615838), caused by mutation in the LYRM7 gene (615831) on chromosome 5q23; MC3DN9 (616111), caused by mutation in the UQCC3 gene (616097) on chromosome 11q12; and MC3DN10 (618775), caused by mutation in the UQCRFS1 gene (191327) on chromosome 19q12.&#13; See also MTYCB (516020) for a discussion of a milder phenotype associated with isolated mitochondrial complex III deficiency and mutations in a mitochondrial-encoded gene.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/762097">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_766745"><div><strong>Microcephalic primordial dwarfism due to RTTN deficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>766745</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.">C3553831</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A rare genetic neurodevelopmental disorder with primordial microcephaly, with characteristics of primary microcephaly, moderate to severe intellectual disability and global developmental delay. Variable brain malformations are common ranging from simplified gyration, to cortical malformations such as pachygyria, polymicrogyria, reduced sulcation and midline defects. Craniofacial dysmorphism (e.g. sloping forehead, high and broad nasal bridge) are related to the primary microcephaly. Short stature is frequently observed, and may be severe. Germline biallelic variants in RTTN (18q22.2) are responsible for the disease. The pattern of inheritance is autosomal recessive.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/766745">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_766969"><div><strong>Peroxisome biogenesis disorder 14B</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>766969</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.">C3554055</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">PBD14B is an autosomal recessive peroxisome biogenesis disorder characterized clinically by mild intellectual disability, congenital cataracts, progressive hearing loss, and polyneuropathy (Ebberink et al., 2012), all of which had been observed in patients with mild peroxisomal biogenesis disorders (e.g., Kelley et al., 1986; Poll-The et al., 1987). Additionally, recurrent migraine-like episodes following mental stress or physical exertion, not a common feature in peroxisome disorders, was reported.&#13; Thoms and Gartner (2012) classified the disorder described by Ebberink et al. (2012) in their patient as a mild 'Zellweger syndrome (214100) spectrum' (ZSS) disorder. See PBD1B (601539) for a phenotypic description and discussion of genetic heterogeneity of less severe phenotypes on the Zellweger syndrome spectrum. See PBD9B (614879) for another atypical peroxisome biogenesis disorder.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/766969">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_815954"><div><strong>Developmental and epileptic encephalopathy, 18</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>815954</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.">C3809624</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-18 (DEE18) is a severe autosomal recessive neurologic disorder characterized by lack of psychomotor development apparent from birth, dysmorphic facial features, and early onset of refractory seizures. Brain imaging shows a thick corpus callosum and persistent cavum septum pellucidum on brain imaging (summary by Basel-Vanagaite et al., 2013).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/815954">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_863956"><div><strong>Developmental and epileptic encephalopathy, 28</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>863956</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.">C4015519</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-28 (DEE28) is an autosomal recessive severe neurologic disorder characterized by the onset of refractory seizures in the first months of life. Affected individuals have severe axial hypotonia and profoundly impaired psychomotor development. More severely affected patients have acquired microcephaly, poor or absent visual contact, and retinal degeneration; early death may occur (summary by Mignot et al., 2015).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/863956">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_895574"><div><strong>Microcephaly-intellectual disability-sensorineural hearing loss-epilepsy-abnormal muscle tone syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>895574</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.">C4225276</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with hearing loss, seizures, and brain abnormalities (NEDHSB) is an autosomal recessive disorder characterized by severe neurologic impairment including impaired intellectual development, epilepsy, microcephaly, abnormal muscle tone, and sensorineural hearing loss. Most affected individuals are nonambulatory, cannot sit unassisted, and have no speech development. More variable features include feeding difficulties, poor growth, cortical visual impairment, spasticity, scoliosis, immunodeficiency, and thrombocytopenia (Tanaka et al., 2015).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/895574">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_909304"><div><strong>Intellectual disability, autosomal dominant 39</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>909304</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.">C4225296</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">An autosomal dominant condition caused by mutation(s) in the MYT1L gene, encoding myelin transcription factor 1-like protein. It is characterized by intellectual disability and mild dysmorphic facial features.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/909304">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934602"><div><strong>Developmental and epileptic encephalopathy, 49</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934602</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.">C4310635</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-49 (DEE49) is a severe autosomal recessive neurologic disorder characterized by onset of seizures in the neonatal period, global developmental delay with intellectual disability and lack of speech, hypotonia, spasticity, and coarse facial features. Some patients may have brain calcifications on imaging (summary by Han et al., 2016).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934602">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934610"><div><strong>Neurodevelopmental disorder with hypotonia, seizures, and absent language</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934610</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.">C4310643</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934610">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934650"><div><strong>Intellectual disability-epilepsy-extrapyramidal syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934650</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.">C4310683</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with hypotonia and impaired expressive language and with or without seizures (NEDHELS) is an autosomal recessive disorder characterized by hypotonia, poor feeding, and global developmental delay apparent from infancy. Most patients have poor overall growth, poor eye contact, sleep disturbances, and severely impaired expressive language. Affected individuals also tend to have behavioral problems, microcephaly, and variable dysmorphic features; many develop seizures. Brain imaging may show enlarged ventricles, thin corpus callosum and brainstem, and white matter abnormalities. The phenotype is variable (summary by Nabais Sa et al., 2019).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934650">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934652"><div><strong>Developmental and epileptic encephalopathy, 47</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934652</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.">C4310685</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-47 (DEE47) is a neurologic disorder characterized by onset of intractable seizures in the first days or weeks of life. EEG shows background slowing and multifocal epileptic spikes, and may show hypsarrhythmia. Most patients have developmental regression after seizure onset and show persistent intellectual disability and neurologic impairment, although the severity is variable. Treatment with phenytoin, a voltage-gated sodium channel blocker, may be beneficial (summary by Guella et al., 2016).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934652">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934683"><div><strong>Developmental and epileptic encephalopathy, 42</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934683</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.">C4310716</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-42 (DEE42) is a neurologic disorder characterized by the onset of various types of seizures in the first hours or days of life, although rare patients may have onset in the first weeks of life. The seizures tend to be refractory and associated with EEG abnormalities, including multifocal spikes and generalized spike-wave complexes. Affected infants show global developmental delay with severely impaired intellectual development. Other features may include axial hypotonia, peripheral hypertonia with hyperreflexia, tremor, ataxia, and abnormal eye movements (summary by the Epi4K Consortium, 2016).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934683">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934684"><div><strong>Developmental and epileptic encephalopathy, 41</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934684</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.">C4310717</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-41 (DEE41) is a neurologic disorder characterized by the onset of seizures in the first days or weeks of life. Affected infants show severely impaired psychomotor development with hypotonia, spasticity, lack of speech, poor visual fixation, feeding difficulties sometimes necessitating tube feeding, poor overall growth and microcephaly, and contractures. Brain imaging may show delayed myelination, thin corpus callosum, and cerebral atrophy (summary by the EPI4K Consortium, 2016).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934684">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934713"><div><strong>Hermansky-Pudlak syndrome 10</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934713</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.">C4310746</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hermansky-Pudlak syndrome (HPS) is characterized by oculocutaneous albinism, a bleeding diathesis, and, in some individuals, pulmonary fibrosis, granulomatous colitis, and/or immunodeficiency. Ocular findings include nystagmus, reduced iris pigment, reduced retinal pigment, foveal hypoplasia with significant reduction in visual acuity (usually in the range of 20/50 to 20/400), and strabismus in many individuals. Hair color ranges from white to brown; skin color ranges from white to olive and is usually at least a shade lighter than that of other family members. The bleeding diathesis can result in variable degrees of bruising, epistaxis, gingival bleeding, postpartum hemorrhage, colonic bleeding, and prolonged bleeding with menses or after tooth extraction, circumcision, and/or other surgeries. Pulmonary fibrosis, colitis, and/or neutropenia have been reported in individuals with pathogenic variants in some HPS-related genes. Pulmonary fibrosis, a restrictive lung disease, typically causes symptoms in the early 30s and can progress to death within a decade. Granulomatous colitis is severe in about 15% of affected individuals. Neutropenia and/or immune defects occur primarily in individuals with pathogenic variants in AP3B1 and AP3D1.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934713">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_934728"><div><strong>Hydrops-lactic acidosis-sideroblastic anemia-multisystemic failure syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>934728</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.">C4310761</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Hydrops, lactic acidosis, and sideroblastic anemia (HLASA) is an autosomal recessive multisystem disorder characterized by the onset of hydrops in utero. The severity of the hydrops and the disorder in general is highly variable. At birth, affected infants usually show poor growth, lactic acidosis, pulmonary hypertension with hypoxic respiratory insufficiency, and sideroblastic anemia. More variable features may include hepatosplenomegaly or cholestasis, hypoglycemia, pancreatic insufficiency, and micropenis or hypospadias. Death in infancy may occur. Those who survive tend to have resolution of lactic acidosis and anemia, but may show developmental delay and sensorineural deafness (summary by Riley et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/934728">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1392637"><div><strong>Developmental and epileptic encephalopathy, 54</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1392637</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.">C4479319</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">HNRNPU-related neurodevelopmental disorder (HNRNPU-NDD) is characterized by developmental delay and intellectual disability typically moderate to severe with speech and language delay and/or absent speech. Affected individuals may also display autistic features. There may be feeding difficulties during the neonatal period as well as hypotonia, which often remains lifelong. Dysmorphic features have been described but they are nonspecific. Affected individuals are likely to experience seizures (most commonly tonic-clonic or absence) that may be refractory to treatment. Nonspecific brain MRI findings include ventriculomegaly and thinning of the corpus callosum. Less common findings include cardiac abnormalities, strabismus, undescended testes in males, renal anomalies, and skeletal features, including joint laxity, polydactyly, and scoliosis. Rarely, abnormal breathing patterns, including hyperventilation and apnea, may be present and can lead to sleep disturbance.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1392637">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1382171"><div><strong>Neurodevelopmental disorder with hypotonia, neuropathy, and deafness</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1382171</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.">C4479603</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">SPTBN4 disorder is typically characterized by severe-to-profound developmental delay and/or intellectual disability, although two individuals in one family had a milder phenotype, including one individual with normal cognitive development. Speech and language skills are often severely limited. Affected individuals rarely achieve head control. Most are unable to sit, stand, or walk. Affected individuals typically have congenital hypotonia that may transition to hypertonia. Axonal motor neuropathy leads to hyporeflexia/areflexia and weakness, which can result in respiratory difficulties requiring ventilatory support. Most affected individuals require tube feeding for nutrition. Half of affected individuals develop seizures. Cortical visual impairment and auditory neuropathy have also been reported.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1382171">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1385598"><div><strong>Autosomal recessive limb-girdle muscular dystrophy type R18</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1385598</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.">C4517996</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal recessive limb-girdle muscular dystrophy-18 (LGMDR18) is characterized by childhood-onset of proximal muscle weakness resulting in gait abnormalities and scapular winging. Serum creatine kinase is increased. A subset of patients may show a hyperkinetic movement disorder with chorea, ataxia, or dystonia and global developmental delay (summary by Bogershausen et al., 2013). Additional more variable features include alacrima, achalasia, cataracts, or hepatic steatosis (Liang et al., 2015; Koehler et al., 2017).&#13; For a discussion of genetic heterogeneity of autosomal recessive limb-girdle muscular dystrophy, see LGMDR1 (253600).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1385598">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1377817"><div><strong>Combined oxidative phosphorylation defect type 8</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1377817</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.">C4518839</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">AARS2-related disorder includes two distinct phenotypes, infantile-onset cardiomyopathy and neurodegeneration with or without leukoencephalopathy. AARS2-related infantile-onset cardiomyopathy is characterized by hypertrophic cardiomyopathy, hypotonia, skeletal myopathy, and often lung hypoplasia. Some individuals have nonimmune hydrops and/or seizures. AARS2-related neurodegeneration with or without leukoencephalopathy is characterized by movement disorders, cognitive decline, ovarian failure in females, and psychiatric manifestations. Additional neurologic manifestations (seizures, developmental delay, neuropathy, and/or myopathy) and ocular manifestations can also be present.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1377817">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1626119"><div><strong>Cerebellar atrophy, developmental delay, and seizures</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1626119</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.">C4539985</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1626119">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1621755"><div><strong>Developmental and epileptic encephalopathy, 56</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1621755</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.">C4540034</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-56 (DEE56) is a neurodevelopmental disorder characterized by early-onset seizures in most patients, followed by impaired intellectual development, variable behavioral abnormalities, and sometimes additional neurologic features, such as ataxia (summary by Guella et al., 2017).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1621755">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1622296"><div><strong>Intellectual disability, autosomal recessive 61</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1622296</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.">C4540424</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">MRT61 is an autosomal recessive neurodevelopmental disorder characterized by delayed psychomotor development, moderate to severe intellectual disability, and variable dysmorphic facial features. More severely affected patients may develop refractory seizures and have brain abnormalities, including hypoplasia of the corpus callosum (summary by Alwadei et al., 2016).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1622296">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1623344"><div><strong>Intellectual disability, autosomal dominant 53</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1623344</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.">C4540481</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1623344">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1615160"><div><strong>Glycosylphosphatidylinositol biosynthesis defect 15</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1615160</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.">C4540520</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">GPIBD15 is an autosomal recessive disorder characterized by delayed psychomotor development, variable intellectual disability, hypotonia, early-onset seizures in most patients, and cerebellar atrophy, resulting in cerebellar signs including gait ataxia and dysarthria. The disorder is caused by a defect in glycosylphosphatidylinositol (GPI) biosynthesis (summary by Nguyen et al., 2017).&#13; For a discussion of genetic heterogeneity of GPI biosynthesis defects, see GPIBD1 (610293).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1615160">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1639327"><div><strong>Rubinstein-Taybi syndrome due to CREBBP mutations</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1639327</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.">C4551859</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Rubinstein-Taybi syndrome (RSTS) is characterized by distinctive facial features, broad and often angulated thumbs and halluces, short stature, and moderate-to-severe intellectual disability. Characteristic craniofacial features include downslanted palpebral fissures, low-hanging columella, high palate, grimacing smile, and talon cusps. Prenatal growth is often normal, then height, weight, and head circumference percentiles rapidly drop in the first few months of life. Short stature is typical in adulthood. Obesity may develop in childhood or adolescence. Average IQ ranges between 35 and 50; however, developmental outcome varies considerably. Some individuals with EP300-related RSTS have normal intellect. Additional features include ocular abnormalities, hearing loss, respiratory difficulties, congenital heart defects, renal abnormalities, cryptorchidism, feeding problems, recurrent infections, and severe constipation.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1639327">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1645412"><div><strong>Encephalopathy due to GLUT1 deficiency</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1645412</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.">C4551966</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Glucose transporter type 1 deficiency syndrome (Glut1DS) is a disorder of brain energy metabolism. Glucose, the essential metabolic fuel for the brain, is transported into the brain exclusively by the protein glucose transporter type 1 (Glut1) across the endothelial cells forming the blood-brain barrier (BBB). Glut1DS results from the inability of Glut1 to transfer sufficient glucose across the BBB to meet the glucose demands of the brain. The needs of the brain for glucose increase rapidly after birth, peaking in early childhood, remaining high until about age 10 years, then gradually decreasing throughout adolescence and plateauing in early adulthood. When first diagnosed in infancy to early childhood, the predominant clinical findings of Glut1DS are paroxysmal eye-head movements, pharmacoresistant seizures of varying types, deceleration of head growth, and developmental delay. Subsequently children develop complex movement disorders and intellectual disability ranging from mild to severe. Institution of ketogenic diet therapies (KDTs) helps with early neurologic growth and development and seizure control. Typically, the earlier the treatment the better the long-term clinical outcome. When first diagnosed in later childhood to adulthood (occasionally in a parent following the diagnosis of an affected child), the predominant clinical findings of Glut1DS are usually complex paroxysmal movement disorders, spasticity, ataxia, dystonia, speech difficulty, and intellectual disability.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1645412">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1646665"><div><strong>Neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal recessive</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1646665</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.">C4693325</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">GRIN1-related neurodevelopmental disorder (GRIN1-NDD) is characterized by mild-to-profound developmental delay / intellectual disability (DD/ID) in all affected individuals. Other common manifestations are epilepsy, muscular hypotonia, movement disorders, spasticity, feeding difficulties, and behavior issues. A subset of individuals show a malformation of cortical development consisting of extensive and diffuse bilateral polymicrogyria. To date, 72 individuals with GRIN1-NDD have been reported.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1646665">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1638319"><div><strong>Developmental and epileptic encephalopathy 92</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1638319</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.">C4693362</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-92 (DEE92) is characterized in most patients by onset of seizures in infancy or childhood and associated with global developmental delay and variable impairment of intellectual development. The seizure type and severity varies, and seizures may be intractable in some patients. Some patients are severely affected, unable to walk or speak, whereas others show some development. Additional neurologic features, including cortical blindness, dystonia, and spasticity, may occur. Mutations occur de novo (summary by Hamdan et al., 2017).&#13; For a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1638319">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1635938"><div><strong>Intellectual disability, autosomal dominant 55, with seizures</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1635938</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.">C4693371</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1635938">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1641343"><div><strong>Developmental delay and seizures with or without movement abnormalities</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1641343</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.">C4693376</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">DEDSM is a neurodevelopmental disorder characterized by global developmental delay, variable intellectual disability, and early-onset seizures with a myoclonic component. Most patients have delayed motor development and show abnormal movements, including ataxia, dystonia, and tremor (summary by Hamdan et al., 2017).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1641343">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1639653"><div><strong>Combined oxidative phosphorylation deficiency 35</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1639653</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.">C4693466</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Combined oxidative phosphorylation deficiency-35 (COXPD35) is an autosomal recessive disorder characterized mainly by global developmental delay with intellectual disability, microcephaly, and early-onset myoclonic and other types of seizures. Affected individuals have variable deficiencies of mitochondrial respiratory enzyme complexes resulting from a defect in mitochondrial metabolism (summary by Kernohan et al., 2017).&#13; For a discussion of genetic heterogeneity of combined oxidative phosphorylation deficiency, see COXPD1 (609060).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1639653">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1646997"><div><strong>Encephalopathy, acute, infection-induced (herpes-specific), susceptibility to, 8</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1646997</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.">C4693542</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1646997">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1643555"><div><strong>3p- syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1643555</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.">C4706503</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Characteristic features of the distal 3p- syndrome include low birth weight, microcephaly, trigonocephaly, hypotonia, psychomotor and growth retardation, ptosis, telecanthus, downslanting palpebral fissures, and micrognathia. Postaxial polydactyly, renal anomalies, cleft palate, congenital heart defects (especially atrioventricular septal defects), preauricular pits, sacral dimple, and gastrointestinal anomalies are variable features. Although intellectual deficits are almost invariably associated with cytogenetically visible 3p deletions, rare patients with a 3p26-p25 deletion and normal intelligence or only mild abnormalities have been described (summary by Shuib et al., 2009).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1643555">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648386"><div><strong>Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy 1</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648386</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.">C4721893</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy (PLOSL) is characterized by fractures (resulting from radiologically demonstrable polycystic osseous lesions), frontal lobe syndrome, and progressive presenile dementia beginning in the fourth decade. The clinical course of PLOSL can be divided into four stages: 1.. The latent stage is characterized by normal early development. 2.. The osseous stage (3rd decade of life) is characterized by pain and tenderness, mostly in ankles and feet, usually following strain or injury. Fractures are typically diagnosed several years later, most commonly in the bones of the extremities. 3.. In the early neurologic stage (4th decade of life), a change of personality begins to develop insidiously. Affected individuals show a frontal lobe syndrome (loss of judgment, euphoria, loss of social inhibitions, disturbance of concentration, and lack of insight, libido, and motor persistence) leading to serious social issues. 4.. The late neurologic stage is characterized by progressive dementia and loss of mobility. Death usually occurs before age 50 years.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648386">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648285"><div><strong>Developmental and epileptic encephalopathy, 67</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648285</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.">C4748341</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-67 (DEE67) is characterized by the onset of various types of seizures in the first months of life, although later onset may occur in milder cases. The seizures tend to be resistant to treatment. Affected individuals have global developmental delay with impaired motor and intellectual development, poor or absent speech, movement disorders, and stereotypic or autistic behavior (summary by Chatron et al., 2018).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648285">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648399"><div><strong>Cortical dysplasia, complex, with other brain malformations 9</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648399</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.">C4748540</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Complex cortical dysplasia with other brain malformations-9 is a severe autosomal recessive disorder characterized by profoundly impaired motor and cognitive development apparent from early infancy. Affected individuals develop intractable seizures and are unable to speak or ambulate. Brain imaging shows pachygyria as well as hypogenesis of the corpus callosum and other variable brain abnormalities. The phenotype results from impaired cortical neuronal migration (summary by Schaffer et al., 2018).&#13; For a discussion of genetic heterogeneity of CDCBM, see CDCBM1 (614039).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648399">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648374"><div><strong>Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy 2</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648374</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.">C4748657</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy-2 (PLOSL2), or Nasu-Hakola disease, is a recessively inherited presenile frontal dementia with leukoencephalopathy and basal ganglia calcification. In most cases the disorder first manifests in early adulthood as pain and swelling in ankles and feet, followed by bone fractures. Neurologic symptoms manifest in the fourth decade of life as a frontal lobe syndrome with loss of judgment, euphoria, and disinhibition. Progressive decline in other cognitive domains begins to develop at about the same time. The disorder culminates in a profound dementia and death by age 50 years (summary by Klunemann et al., 2005).&#13; For a discussion of genetic heterogeneity of polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy, see 221770.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648374">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648431"><div><strong>Infantile hypotonia-oculomotor anomalies-hyperkinetic movements-developmental delay syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648431</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.">C4748715</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Baker-Gordon syndrome (BAGOS) is a neurodevelopmental disorder characterized by infantile hypotonia, ophthalmic abnormalities, moderate to profound global developmental delay, poor or absent speech, behavioral abnormalities, hyperkinetic movements, and EEG abnormalities in the absence of overt seizures (summary by Baker et al., 2018).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648431">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648283"><div><strong>Mitochondrial complex 1 deficiency, nuclear type 26</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648283</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.">C4748809</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Mitochondrial complex I deficiency nuclear type 26 (MC1DN26) is an enzymatic defect resulting in decreased levels of complex I activity. Presentation ranges from severe lethal neonatal disease with combined respiratory/metabolic acidosis and lactic acidemia, to childhood-onset progressive generalized dystonia and later axonal motor and sensory peripheral polyneuropathy without acidosis or intellectual impairment and survival into adulthood. Brain abnormalities detected on MRI are consistent with Leigh syndrome (see 256000) (Baertling et al., 2018).&#13; For a discussion of genetic heterogeneity of mitochondrial complex I deficiency, see 252010.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648283">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648322"><div><strong>Trichohepatoneurodevelopmental syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648322</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.">C4748898</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Trichohepatoneurodevelopmental syndrome is a complex multisystem disorder characterized by woolly or coarse hair, liver dysfunction, pruritus, dysmorphic features, hypotonia, and severe global developmental delay (Morimoto et al., 2018).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648322">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1648381"><div><strong>Developmental and epileptic encephalopathy, 69</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648381</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.">C4748988</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-69 (DEE69) is an autosomal dominant severe neurodevelopmental encephalopathic disorder characterized by early-onset refractory seizures, hypotonia, and profoundly impaired development often associated with macrocephaly, hyperkinetic movements, and contractures. The disorder can sometimes result in early death. Some patients may have a favorable seizure response to topiramate medication (summary by Helbig et al., 2018).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1648381">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1663069"><div><strong>Combined oxidative phosphorylation defect type 14</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1663069</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.">C4755312</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The spectrum of FARS2 deficiency ranges from the infantile-onset phenotype, characterized by epileptic encephalopathy with lactic acidosis and poor prognosis (70% of affected individuals), to the later-onset phenotype, characterized by spastic paraplegia, less severe neurologic manifestations, and longer survival (30% of affected individuals). To date FARS2 deficiency has been reported in 37 individuals from 25 families. Infantile-onset phenotype. Seizures are difficult to control and may progress quickly at an early age to intractable seizures with frequent status epilepticus; some children have hypsarrhythmia on EEG. All have developmental delay; most are nonverbal and unable to walk. Feeding difficulties are common. More than half of affected children die in early childhood. Later-onset phenotype. All affected individuals have spastic paraplegia manifested by weakness, spasticity, and exaggerated reflexes of the lower extremities associated with walking difficulties; some have developmental delay/intellectual disability; some have brief seizures that resolve over time.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1663069">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1676229"><div><strong>Microcephaly, growth deficiency, seizures, and brain malformations</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1676229</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.">C5193042</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Microcephaly, growth deficiency, seizures, and brain malformations (MIGSB) is a severe autosomal recessive disorder characterized by intrauterine growth retardation, postnatal growth deficiency with severe microcephaly, and poor or absent psychomotor development. Additional features include optic atrophy, early-onset seizures, dysmorphic facial features, and brain malformations, such as partial agenesis of the corpus callosum and simplified gyration (summary by Shaheen et al., 2015).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1676229">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1676579"><div><strong>Neurodegeneration, early-onset, with choreoathetoid movements and microcytic anemia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1676579</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.">C5193104</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Early-onset neurodegeneration with choreoathetoid movements and microcytic anemia (NDCAMA) is an autosomal recessive disorder characterized by severe psychomotor developmental abnormalities, abnormal movements, and functional iron deficiency (Costain et al., 2019).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1676579">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1672912"><div><strong>Neurodevelopmental disorder with seizures and speech and walking impairment</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1672912</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.">C5193119</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with seizures and speech and walking impairment (NEDSSWI) is an autosomal recessive disorder with onset in infancy. Patients show global developmental delay, particularly of speech acquisition, as well as walking difficulties due to hypotonia, hypertonia, spasticity, or poor coordination. Other features include seizures, mild dysmorphic features, and variable short stature. The pregnancies tend to be complicated by hyper- or hypotension (summary by Ganapathi et al., 2019).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1672912">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1684663"><div><strong>Neurodevelopmental disorder with behavioral abnormalities, absent speech, and hypotonia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1684663</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.">C5231471</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with behavioral abnormalities, absent speech, and hypotonia (NEDBASH) is an autosomal recessive disorder characterized by severely impaired intellectual and motor development, axial and peripheral hypotonia usually with inability to walk, and significant behavioral abnormalities consistent with autism spectrum disorder and reminiscent of Rett syndrome (RTT; 312750), such as poor communication, stereotypic or repetitive behaviors, hand-wringing, bruxism, and sleep disturbances. Other features include poor overall growth, and joint hypermobility. Rare features include seizures, dystonia, spasticity, and nonspecific brain abnormalities (summary by Abu-Libdeh et al., 2019 and Dias et al., 2019).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1684663">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1684874"><div><strong>Neurodevelopmental disorder with hypotonia and autistic features with or without hyperkinetic movements</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1684874</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.">C5231491</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with hypotonia and autistic features with or without hyperkinetic movements (NEDHAHM) is characterized by axial hypotonia apparent from birth, global developmental delay with impaired intellectual development and poor or absent language acquisition, and behavioral abnormalities, including autistic features, poor social interaction, and hang-wringing. Most patients have childhood-onset seizures that are usually responsive to medication, and a subset of patients develop cortical visual impairment and involuntary hyperkinetic movements, including chorea and dystonia. Some of the features are reminiscent of Rett syndrome (RTT; 312750) (summary by Salpietro et al., 2019).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1684874">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1708832"><div><strong>Developmental and epileptic encephalopathy, 85, with or without midline brain defects</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1708832</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.">C5393312</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-85 with or without midline brain defects (DEE85) is an X-linked neurologic disorder characterized by onset of severe refractory seizures in the first year of life, global developmental delay with impaired intellectual development and poor or absent speech, and dysmorphic facial features. The seizures tend to show a cyclic pattern with clustering. Many patients have midline brain defects on brain imaging, including thin corpus callosum and/or variable forms of holoprosencephaly (HPE). The severity and clinical manifestations are variable. Almost all reported patients are females with de novo mutations predicted to result in a loss of function (LOF). However, some patients may show skewed X inactivation, and the pathogenic mechanism may be due to a dominant-negative effect. The SMC1A protein is part of the multiprotein cohesin complex involved in chromatid cohesion during DNA replication and transcriptional regulation; DEE85 can thus be classified as a 'cohesinopathy' (summary by Symonds et al., 2017 and Kruszka et al., 2019).&#13; For a general phenotypic description and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1708832">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1711894"><div><strong>Beck-Fahrner syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1711894</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.">C5394097</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">TET3-related Beck-Fahrner syndrome (TET3-BEFAHRS) is a condition within the spectrum of mendelian disorders of the epigenetic machinery (MDEMs) or chromatinopathies. Clinical features typically include intellectual disability / developmental delay ranging from mild to severe affecting both motor and language skills. Most affected individuals are verbal and ambulatory, with most walking by age 15-36 months. Hypotonia in infancy and childhood can exacerbate motor and expressive speech delay and, in some cases, cause feeding difficulties that require nasogastric or gastrostomy tube feeding. Some affected individuals display movement disorders. About one third of affected individuals have epilepsy. Other neurobehavioral features can include autism, anxiety, and attention-deficit/hyperactivity disorder. Strabismus and refractive errors are found in about half of affected individuals. Both conductive and sensorineural hearing loss have been observed. Approximately half of individuals exhibit typical growth and half exhibit growth abnormalities, with overgrowth being more common than undergrowth and macrocephaly being the most common manifestation of altered growth. While many affected individuals have dysmorphic features, these are typically nonspecific. Congenital heart defects, brain malformations, and genitourinary anomalies are less common findings.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1711894">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1718072"><div><strong>Sandestig-stefanova syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1718072</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.">C5394118</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Sandestig-Stefanova syndrome (SANDSTEF) is an autosomal recessive developmental syndrome characterized by pre- and postnatal microcephaly, trigonocephaly, congenital cataract, microphthalmia, facial gestalt, camptodactyly, loss of periventricular white matter, thin corpus callosum, delayed myelinization, and poor prognosis (Sandestig et al., 2019).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1718072">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1708515"><div><strong>Chromosome 1p36.33 duplication syndrome, atad3 gene cluster, autosomal dominant</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1708515</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.">C5394150</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Autosomal dominant chromosome 1p36.33 duplication syndrome is a severe multisystemic disorder characterized by neonatal respiratory insufficiency, hypotonia, and cardiomyopathy, resulting in death in the first weeks of life. Affected infants may also have seizures, contractures, and corneal opacities. Brain imaging shows variable anomalies, such as white matter changes, and laboratory studies suggest that the phenotype results from metabolic defects in mitochondrial and cholesterol homeostasis (summary by Gunning et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1708515">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1715031"><div><strong>Neurodegeneration, childhood-onset, with ataxia, tremor, optic atrophy, and cognitive decline</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1715031</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.">C5394335</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Childhood-onset neurodegeneration with ataxia, tremor, optic atrophy, and cognitive decline (CONATOC) is an autosomal recessive progressive disorder with onset of symptoms in the first decade. Brain imaging may show variable features, including leukoencephalopathy and cerebellar atrophy (summary by Fagerberg et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1715031">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1719546"><div><strong>Lissencephaly 10</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1719546</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.">C5394354</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Lissencephaly-10 (LIS10) is a neurologic disorder characterized by variably delayed development with mildly to moderately impaired intellectual development and language delay, as well as seizures, which are often intractable. There is a spectrum of severity, with some patients having normal early development and only borderline to mild cognitive impairment. Brain imaging shows features consistent with neuronal migration defects, including posterior-predominant lissencephaly, pachygyria, agyria, and subcortical band heterotopia (summary by Tsai et al., 2020).&#13; For a general description and a discussion of genetic heterogeneity of lissencephaly, see LIS1 (607432).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1719546">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1756624"><div><strong>Deeah syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1756624</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.">C5436579</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">DEEAH syndrome is an autosomal recessive multisystemic disorder with onset in early infancy. Affected individuals usually present in the perinatal period with respiratory insufficiency, apneic episodes, and generalized hypotonia. The patients have failure to thrive and severely impaired global development with poor acquisition of motor, cognitive, and language skills. Other common features include endocrine, pancreatic exocrine, and autonomic dysfunction, as well as hematologic disturbances, mainly low hemoglobin. Patients also have dysmorphic and myopathic facial features. Additional more variable features include seizures, undescended testes, and distal skeletal anomalies. Death in early childhood may occur (summary by Schneeberger et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1756624">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1776912"><div><strong>Neurodevelopmental disorder with dysmorphic facies, impaired speech, and hypotonia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1776912</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.">C5436585</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with dysmorphic facies, impaired speech, and hypotonia (NEDDISH) is an autosomal recessive disorder characterized by global developmental delay and mildly to severely impaired intellectual development with poor speech and language acquisition. Some patients may have early normal development with onset of the disorder in the first years of life. More variable neurologic abnormalities include hypotonia, seizures, apnea, mild signs of autonomic or peripheral neuropathy, and autism. Aside from dysmorphic facial features and occasional findings such as scoliosis or undescended testes, other organ systems are not involved (summary by Schneeberger et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1776912">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1727046"><div><strong>Intellectual developmental disorder with paroxysmal dyskinesia or seizures</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1727046</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.">C5436894</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Intellectual developmental disorder with paroxysmal dyskinesia or seizures (IDDPADS) is an autosomal recessive complex neurologic disorder characterized by global developmental delay with impaired intellectual development and language delay. In addition, most patients develop a paroxysmal hyperkinetic movement disorder in the first months or years of life manifest as sudden falls or backward propulsion, eye or head deviation, and dystonic limb posturing followed by chorea and dyskinetic movements. The episodes are pharmacoresistant to anticonvulsant medication. EEG may show interictal abnormalities, but are usually not consistent with epilepsy. However, some patients may also develop epileptic seizures or only have seizures without a movement disorder (summary by Doummar et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1727046">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1781967"><div><strong>Neurodegeneration, childhood-onset, with hypotonia, respiratory insufficiency, and brain imaging abnormalities</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1781967</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.">C5543020</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neuronal ceroid lipofuscinosis-15 (CLN15) is characterized by severe global developmental delay apparent in infancy or early childhood. Affected individuals have hypotonia with impaired motor development, respiratory insufficiency, and feeding difficulties requiring intervention. Intellectual and speech development is also delayed, and most have visual defects, including cortical visual blindness, nystagmus, and esotropia. The disorder is progressive, as manifest by developmental regression consistent with neurodegeneration. Although overt seizures are not observed, some patients may have episodic hypertonia or apnea, and EEG may show nonspecific abnormalities. Brain imaging shows unique diffusion restriction signal abnormalities affecting the brainstem, cerebellum, and corticospinal tracts. Early death may occur (summary by Polovitskaya et al., 2020).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1781967">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1785587"><div><strong>Developmental delay with dysmorphic facies and dental anomalies</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1785587</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.">C5543197</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental delay with dysmorphic facies and dental anomalies (DEFDA) is characterized by generally mild global developmental delay with variably impaired intellectual development, walking by 2 to 3 years, and slow language acquisition. The severity of the disorder ranges from moderate cognitive deficits to mild learning difficulties or behavioral abnormalities. Most patients have dysmorphic facial features, often with abnormal dentition and nonspecific visual defects, such as myopia, astigmatism, and strabismus. Although rare, involvement of other systems, such as skeletal, cardiac, and gastrointestinal, may be present (summary by den Hoed et al., 2021).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1785587">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1781649"><div><strong>Kohlschutter-Tonz syndrome-like</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1781649</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.">C5543202</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Den Hoed-de Boer-Voisin syndrome (DHDBV) is characterized by global developmental delay with moderately to severely impaired intellectual development, poor or absent speech, and delayed motor skills. Although the severity of the disorder varies, many patients are nonverbal and have hypotonia with inability to sit or walk. Early-onset epilepsy is common and may be refractory to treatment, leading to epileptic encephalopathy and further interruption of developmental progress. Most patients have feeding difficulties with poor overall growth and dysmorphic facial features, as well as significant dental anomalies resembling amelogenesis imperfecta. The phenotype is reminiscent of Kohlschutter-Tonz syndrome (KTZS; 226750). More variable features of DHDBV include visual defects, behavioral abnormalities, and nonspecific involvement of other organ systems (summary by den Hoed et al., 2021).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1781649">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1786100"><div><strong>Mitochondrial complex IV deficiency, nuclear type 22</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1786100</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.">C5543491</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Mitochondrial complex IV deficiency nuclear type 22 (MC4DN22) is an autosomal recessive metabolic disorder characterized by neonatal hypertrophic cardiomyopathy, encephalopathy, and severe lactic acidosis with fatal outcome (Wintjes et al., 2021).&#13; For a discussion of genetic heterogeneity of mitochondrial complex IV (cytochrome c oxidase) deficiency, see 220110.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1786100">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1794167"><div><strong>Developmental delay, impaired speech, and behavioral abnormalities</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1794167</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.">C5561957</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental delay, impaired speech, and behavioral abnormalities (DDISBA) is characterized by global developmental delay apparent from early childhood. Intellectual disability can range from mild to severe. Additional variable features may include dysmorphic facial features, seizures, hypotonia, motor abnormalities such as Tourette syndrome or dystonia, and hearing loss (summary by Cousin et al., 2021).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1794167">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1794184"><div><strong>Neurodevelopmental disorder with hypotonia and dysmorphic facies</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1794184</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.">C5561974</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder with hypotonia and dysmorphic facies (NEDHYDF) is characterized by global developmental delay and hypotonia apparent from birth. Affected individuals have variably impaired intellectual development, often with speech delay and delayed walking. Seizures are generally not observed, although some patients may have single seizures or late-onset epilepsy. Most patients have prominent dysmorphic facial features. Additional features may include congenital cardiac defects (without arrhythmia), nonspecific renal anomalies, joint contractures or joint hyperextensibility, dry skin, and cryptorchidism. There is significant phenotypic variability in both the neurologic and extraneurologic manifestations (summary by Tan et al., 2022).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1794184">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1794185"><div><strong>Chopra-Amiel-Gordon syndrome</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1794185</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.">C5561975</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">ANKRD17-related neurodevelopmental syndrome is characterized by developmental delay particularly affecting speech and variable intellectual disability. Additional features include autism spectrum disorder, attention-deficit/hyperactivity disorder, ophthalmologic abnormalities (strabismus and refractive errors), growth deficiency, feeding difficulties, recurrent infections, gait and/or balance disturbances, and epilepsy. Characteristic craniofacial features include triangular face shape, high anterior hairline, deep-set and/or almond-shaped eyes with periorbital fullness, low-set ears, thick nasal alae and flared nostrils, full cheeks, and thin vermilion of the upper lip. Less common but distinctive features include cleft palate with Pierre Robin sequence, renal agenesis, and scoliosis.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1794185">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1801754"><div><strong>Phosphoenolpyruvate carboxykinase deficiency, cytosolic</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1801754</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.">C5574905</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Cytosolic phosphoenolpyruvate carboxykinase deficiency causes a defect in gluconeogenesis that results in a 'biochemical signature' of fasting hypoglycemia with high tricarboxylic acid cycle intermediate excretion, particularly of fumarate. Other biochemical anomalies that may be seen during metabolic crisis include ketonuria, dicarboxylic aciduria, and urea cycle dysfunction (Vieira et al., 2017).&#13; See PCKDM (261650) for a discussion of mitochondrial PCK (PEPCK2; 614095) deficiency.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1801754">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1811868"><div><strong>Holoprosencephaly 14</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1811868</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.">C5676994</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Holoprosencephaly-14 (HPE14) is an autosomal recessive condition characterized by severe developmental delay secondary to brain malformations within the holoprosencephaly spectrum (Drissi et al., 2022).&#13; For general phenotypic information and a discussion of genetic heterogeneity of holoprosencephaly, see HPE1 (236100).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1811868">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1846347"><div><strong>Congenital disorder of glycosylation, type IIbb</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1846347</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.">C5882705</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Congenital disorder of glycosylation type IIbb (CDG2BB) is an autosomal recessive disorder characterized by global developmental delay, severely impaired intellectual development, microcephaly, epilepsy, facial dysmorphism, and variable neurologic findings (Duan et al., 2023).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1846347">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1858870"><div><strong>Developmental and epileptic encephalopathy 115</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1858870</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.">C5935604</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Developmental and epileptic encephalopathy-115 (DEE115) is an autosomal recessive disorder characterized by severe developmental delay and epileptic encephalopathy, massive reduction of white matter, hypo-/aplasia of the corpus callosum, neurodevelopmental arrest, and early death (Brugger et al., 2024).&#13; For general phenotypic information and a discussion of genetic heterogeneity of DEE, see 308350.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1858870">Condition Record</a></div></div>
<div class="divPopper rprt" id="rdis_1859522"><div><strong>Neurodevelopmental disorder plus optic atrophy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1859522</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.">C5935605</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Neurodevelopmental disorder plus optic atrophy (NEDOA) is an autosomal recessive disorder characterized by impaired intellectual development and childhood-onset optic atrophy or ataxia (Brugger et al., 2024).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1859522">Condition Record</a></div></div>
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<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1858870" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy 115</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1638319" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy 92</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_815954" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 18</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_863956" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 28</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_934684" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 41</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_934683" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 42</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_934652" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 47</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_934602" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 49</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1392637" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 54</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1621755" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 56</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1648285" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 67</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1648381" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 69</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1708832" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental and epileptic encephalopathy, 85, with or without midline brain defects</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1641343" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental delay and seizures with or without movement abnormalities</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1785587" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental delay with dysmorphic facies and dental anomalies</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1794167" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental delay, impaired speech, and behavioral abnormalities</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_377516" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Electroencephalographic peculiarity: 14 and 6 per sec. positive spike phenomenon</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_343646" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Electroencephalographic peculiarity: fronto-precentral beta wave groups</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1645412" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Encephalopathy due to GLUT1 deficiency</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1646997" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Encephalopathy, acute, infection-induced (herpes-specific), susceptibility to, 8</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_44131" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Galactosylceramide beta-galactosidase deficiency</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_98034" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">GAPO syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1615160" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Glycosylphosphatidylinositol biosynthesis defect 15</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_934713" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hermansky-Pudlak syndrome 10</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1811868" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Holoprosencephaly 14</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_934728" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hydrops-lactic acidosis-sideroblastic anemia-multisystemic failure syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_342403" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hypomyelinating leukodystrophy 3</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_416638" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Immunodeficiency 83, susceptibility to viral infections</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1648431" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Infantile hypotonia-oculomotor anomalies-hyperkinetic movements-developmental delay syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1727046" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual developmental disorder with paroxysmal dyskinesia or seizures</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_324635" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability with optic atrophy, facial dysmorphism, microcephaly, and short stature</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_909304" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, autosomal dominant 39</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_382611" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, autosomal dominant 5</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1623344" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, autosomal dominant 53</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1635938" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, autosomal dominant 55, with seizures</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_462761" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, autosomal dominant 6</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_481912" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, autosomal dominant 8</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_481895" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, autosomal recessive 18</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1622296" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, autosomal recessive 61</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_337201" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, X-linked 82</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_934650" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability-epilepsy-extrapyramidal syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1781649" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Kohlschutter-Tonz syndrome-like</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1719546" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Lissencephaly 10</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_766745" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Microcephalic primordial dwarfism due to RTTN deficiency</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_346929" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Microcephaly 2, primary, autosomal recessive, with or without cortical malformations</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1676229" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Microcephaly, growth deficiency, seizures, and brain malformations</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_895574" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Microcephaly-intellectual disability-sensorineural hearing loss-epilepsy-abnormal muscle tone syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1648283" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Mitochondrial complex 1 deficiency, nuclear type 26</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_762097" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Mitochondrial complex III deficiency nuclear type 1</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1786100" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Mitochondrial complex IV deficiency, nuclear type 22</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_462869" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A3</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1715031" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodegeneration, childhood-onset, with ataxia, tremor, optic atrophy, and cognitive decline</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1781967" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodegeneration, childhood-onset, with hypotonia, respiratory insufficiency, and brain imaging abnormalities</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1676579" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodegeneration, early-onset, with choreoathetoid movements and microcytic anemia</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1859522" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder plus optic atrophy</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1684663" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with behavioral abnormalities, absent speech, and hypotonia</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1776912" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with dysmorphic facies, impaired speech, and hypotonia</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1684874" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with hypotonia and autistic features with or without hyperkinetic movements</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1794184" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with hypotonia and dysmorphic facies</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1382171" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with hypotonia, neuropathy, and deafness</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_934610" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with hypotonia, seizures, and absent language</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1646665" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal recessive</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1672912" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neurodevelopmental disorder with seizures and speech and walking impairment</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_340540" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronal ceroid lipofuscinosis 1</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_325457" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronal ceroid lipofuscinosis 7</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_374004" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronal ceroid lipofuscinosis 8</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_355328" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Neuronal ceroid lipofuscinosis 8 northern epilepsy variant</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_481505" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Occipital pachygyria and polymicrogyria</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_443944" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Odontotrichomelic syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_163237" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Partington syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_766969" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Peroxisome biogenesis disorder 14B</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1801754" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Phosphoenolpyruvate carboxykinase deficiency, cytosolic</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1648386" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy 1</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1648374" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy 2</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_444010" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Potocki-Lupski syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_120645" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Proline dehydrogenase deficiency</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_482685" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Psychomotor retardation, epilepsy, and craniofacial dysmorphism</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_75817" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Reading seizure</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_48441" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Rett syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_462055" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Rett syndrome, congenital variant</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1639327" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Rubinstein-Taybi syndrome due to CREBBP mutations</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_75693" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Saccharopinuria</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1718072" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Sandestig-stefanova syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_48574" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Schizophrenia</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_377052" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Self-limited childhood occipital epilepsy</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_409616" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Severe neonatal-onset encephalopathy with microcephaly</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_162881" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Smith-Magenis syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_124340" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Succinate-semialdehyde dehydrogenase deficiency</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_1648322" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Trichohepatoneurodevelopmental syndrome</a></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#rdis_163228" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Worster-Drought syndrome</a></div></span></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/38128462">EEG abnormalities are not associated with poor antidepressant treatment outcome - A NeuroPharm study.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Jensen KHR,
Urdanibia-Centelles O,
Dam VH,
Köhler-Forsberg K,
Frokjaer VG,
Knudsen GM,
Jørgensen MB,
Ip CT</span><br />
<span class="medgenPMjournal">Eur Neuropsychopharmacol</span>
2024 Feb;79:59-65.
Epub 2023 Dec 20
doi: 10.1016/j.euroneuro.2023.11.004.
<span class="bold">PMID: </span><a href="/pubmed/38128462" target="_blank">38128462</a></div>
<div class="nl"><a target="_blank" href="/pubmed/23740534">Treatment of infantile spasms.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hancock EC,
Osborne JP,
Edwards SW</span><br />
<span class="medgenPMjournal">Cochrane Database Syst Rev</span>
2013 Jun 5;2013(6):CD001770.
doi: 10.1002/14651858.CD001770.pub3.
<span class="bold">PMID: </span><a href="/pubmed/23740534" target="_blank">23740534</a><a href="/pmc/articles/PMC11194850" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/18843624">Treatment of infantile spasms.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hancock EC,
Osborne JP,
Edwards SW</span><br />
<span class="medgenPMjournal">Cochrane Database Syst Rev</span>
2008 Oct 8;(4):CD001770.
doi: 10.1002/14651858.CD001770.pub2.
<span class="bold">PMID: </span><a href="/pubmed/18843624" target="_blank">18843624</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(%22eeg%20abnormality%22%5Btiab%3A~0%5D)%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 (9)</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/35101840">Electroclinical biomarkers of autoimmune encephalitis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Wesselingh R,
Broadley J,
Buzzard K,
Tarlinton D,
Seneviratne U,
Kyndt C,
Stankovich J,
Sanfilippo P,
Nesbitt C,
D'Souza W,
Macdonell R,
Butzkueven H,
O'Brien TJ,
Monif M</span><br />
<span class="medgenPMjournal">Epilepsy Behav</span>
2022 Mar;128:108571.
Epub 2022 Jan 29
doi: 10.1016/j.yebeh.2022.108571.
<span class="bold">PMID: </span><a href="/pubmed/35101840" target="_blank">35101840</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30922182">The insomnia phenotype in genetic Creutzfeldt-Jakob disease based on the E200K mutation.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Feketeova E,
Jarcuskova D,
Janakova A,
Vitkova M,
Dragasek J,
Gdovinova Z</span><br />
<span class="medgenPMjournal">Prion</span>
2019 Jan;13(1):77-82.
doi: 10.1080/19336896.2019.1590938.
<span class="bold">PMID: </span><a href="/pubmed/30922182" target="_blank">30922182</a><a href="/pmc/articles/PMC7000144" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/8333236">Epileptic seizures in aspartylglucosaminuria: a common disorder.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Arvio M,
Oksanen V,
Autio S,
Gaily E,
Sainio K</span><br />
<span class="medgenPMjournal">Acta Neurol Scand</span>
1993 May;87(5):342-4.
doi: 10.1111/j.1600-0404.1993.tb04114.x.
<span class="bold">PMID: </span><a href="/pubmed/8333236" target="_blank">8333236</a></div>
<div class="nl"><a target="_blank" href="/pubmed/1620332">Frontal lobe partial seizures and psychogenic seizures: comparison of clinical and ictal characteristics.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Saygi S,
Katz A,
Marks DA,
Spencer SS</span><br />
<span class="medgenPMjournal">Neurology</span>
1992 Jul;42(7):1274-7.
doi: 10.1212/wnl.42.7.1274.
<span class="bold">PMID: </span><a href="/pubmed/1620332" target="_blank">1620332</a></div>
<div class="nl"><a target="_blank" href="/pubmed/2929744">Postcardiotomy delirium: conclusions after 25 years?</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Smith LW,
Dimsdale JE</span><br />
<span class="medgenPMjournal">Am J Psychiatry</span>
1989 Apr;146(4):452-8.
doi: 10.1176/ajp.146.4.452.
<span class="bold">PMID: </span><a href="/pubmed/2929744" target="_blank">2929744</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22EEG%20abnormality%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 (146)</a></div><h3 class="subhead">Diagnosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/35101840">Electroclinical biomarkers of autoimmune encephalitis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Wesselingh R,
Broadley J,
Buzzard K,
Tarlinton D,
Seneviratne U,
Kyndt C,
Stankovich J,
Sanfilippo P,
Nesbitt C,
D'Souza W,
Macdonell R,
Butzkueven H,
O'Brien TJ,
Monif M</span><br />
<span class="medgenPMjournal">Epilepsy Behav</span>
2022 Mar;128:108571.
Epub 2022 Jan 29
doi: 10.1016/j.yebeh.2022.108571.
<span class="bold">PMID: </span><a href="/pubmed/35101840" target="_blank">35101840</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30922182">The insomnia phenotype in genetic Creutzfeldt-Jakob disease based on the E200K mutation.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Feketeova E,
Jarcuskova D,
Janakova A,
Vitkova M,
Dragasek J,
Gdovinova Z</span><br />
<span class="medgenPMjournal">Prion</span>
2019 Jan;13(1):77-82.
doi: 10.1080/19336896.2019.1590938.
<span class="bold">PMID: </span><a href="/pubmed/30922182" target="_blank">30922182</a><a href="/pmc/articles/PMC7000144" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/22925838">Fixation-off sensitivity.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Brigo F,
Rossini F,
Stefani A,
Nardone R,
Tezzon F,
Fiaschi A,
Manganotti P,
Bongiovanni LG</span><br />
<span class="medgenPMjournal">Clin Neurophysiol</span>
2013 Feb;124(2):221-7.
Epub 2012 Aug 24
doi: 10.1016/j.clinph.2012.07.017.
<span class="bold">PMID: </span><a href="/pubmed/22925838" target="_blank">22925838</a></div>
<div class="nl"><a target="_blank" href="/pubmed/15281962">Status epilepticus and periictal imaging.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Cole AJ</span><br />
<span class="medgenPMjournal">Epilepsia</span>
2004;45 Suppl 4:72-7.
doi: 10.1111/j.0013-9580.2004.04014.x.
<span class="bold">PMID: </span><a href="/pubmed/15281962" target="_blank">15281962</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3087181">Rett syndrome and the electroencephalogram.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Niedermeyer E,
Rett A,
Renner H,
Murphy M,
Naidu S</span><br />
<span class="medgenPMjournal">Am J Med Genet Suppl</span>
1986;1:195-9.
doi: 10.1002/ajmg.1320250522.
<span class="bold">PMID: </span><a href="/pubmed/3087181" target="_blank">3087181</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22EEG%20abnormality%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 (156)</a></div><h3 class="subhead">Therapy</h3>
<div class="nl"><a target="_blank" href="/pubmed/20633758">Catatonia induced by idiopathic hypertrophic pachymeningitis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ito F,
Kondo N,
Fukushima S,
Suzuki K,
Awata S,
Matsuoka H</span><br />
<span class="medgenPMjournal">Gen Hosp Psychiatry</span>
2010 Jul-Aug;32(4):447.e7-447.e10.
Epub 2009 Dec 22
doi: 10.1016/j.genhosppsych.2009.11.007.
<span class="bold">PMID: </span><a href="/pubmed/20633758" target="_blank">20633758</a></div>
<div class="nl"><a target="_blank" href="/pubmed/8333236">Epileptic seizures in aspartylglucosaminuria: a common disorder.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Arvio M,
Oksanen V,
Autio S,
Gaily E,
Sainio K</span><br />
<span class="medgenPMjournal">Acta Neurol Scand</span>
1993 May;87(5):342-4.
doi: 10.1111/j.1600-0404.1993.tb04114.x.
<span class="bold">PMID: </span><a href="/pubmed/8333236" target="_blank">8333236</a></div>
<div class="nl"><a target="_blank" href="/pubmed/2929744">Postcardiotomy delirium: conclusions after 25 years?</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Smith LW,
Dimsdale JE</span><br />
<span class="medgenPMjournal">Am J Psychiatry</span>
1989 Apr;146(4):452-8.
doi: 10.1176/ajp.146.4.452.
<span class="bold">PMID: </span><a href="/pubmed/2929744" target="_blank">2929744</a></div>
<div class="nl"><a target="_blank" href="/pubmed/353063">Relationship between EEG abnormality and aggressive and anti-social behaviour--a critical appraisal.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Harris R</span><br />
<span class="medgenPMjournal">Book Suppl J Child Psychol Psychiatr</span>
1978;(1):13-27.
<span class="bold">PMID: </span><a href="/pubmed/353063" target="_blank">353063</a></div>
<div class="nl"><a target="_blank" href="/pubmed/4691687">Sequelae to pneumoencephalography.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">White YS,
Bell DS,
Mellick R</span><br />
<span class="medgenPMjournal">J Neurol Neurosurg Psychiatry</span>
1973 Feb;36(1):146-51.
doi: 10.1136/jnnp.36.1.146.
<span class="bold">PMID: </span><a href="/pubmed/4691687" target="_blank">4691687</a><a href="/pmc/articles/PMC494289" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22EEG%20abnormality%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 (72)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/38813513">Electroencephalographic abnormalities in children with type 1 diabetes mellitus: a prospective study.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yildirim R,
Günbey C</span><br />
<span class="medgenPMjournal">Turk J Med Sci</span>
2023;53(6):1794-1798.
Epub 2023 Oct 12
doi: 10.55730/1300-0144.5749.
<span class="bold">PMID: </span><a href="/pubmed/38813513" target="_blank">38813513</a><a href="/pmc/articles/PMC10760570" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/35101840">Electroclinical biomarkers of autoimmune encephalitis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Wesselingh R,
Broadley J,
Buzzard K,
Tarlinton D,
Seneviratne U,
Kyndt C,
Stankovich J,
Sanfilippo P,
Nesbitt C,
D'Souza W,
Macdonell R,
Butzkueven H,
O'Brien TJ,
Monif M</span><br />
<span class="medgenPMjournal">Epilepsy Behav</span>
2022 Mar;128:108571.
Epub 2022 Jan 29
doi: 10.1016/j.yebeh.2022.108571.
<span class="bold">PMID: </span><a href="/pubmed/35101840" target="_blank">35101840</a></div>
<div class="nl"><a target="_blank" href="/pubmed/33475161">Seizures in autoimmune encephalitis-A systematic review and quantitative synthesis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yeshokumar AK,
Coughlin A,
Fastman J,
Psaila K,
Harmon M,
Randell T,
Schorr EM,
Han H,
Hoang H,
Soudant C,
Jette N</span><br />
<span class="medgenPMjournal">Epilepsia</span>
2021 Feb;62(2):397-407.
Epub 2021 Jan 21
doi: 10.1111/epi.16807.
<span class="bold">PMID: </span><a href="/pubmed/33475161" target="_blank">33475161</a></div>
<div class="nl"><a target="_blank" href="/pubmed/8333236">Epileptic seizures in aspartylglucosaminuria: a common disorder.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Arvio M,
Oksanen V,
Autio S,
Gaily E,
Sainio K</span><br />
<span class="medgenPMjournal">Acta Neurol Scand</span>
1993 May;87(5):342-4.
doi: 10.1111/j.1600-0404.1993.tb04114.x.
<span class="bold">PMID: </span><a href="/pubmed/8333236" target="_blank">8333236</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3087181">Rett syndrome and the electroencephalogram.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Niedermeyer E,
Rett A,
Renner H,
Murphy M,
Naidu S</span><br />
<span class="medgenPMjournal">Am J Med Genet Suppl</span>
1986;1:195-9.
doi: 10.1002/ajmg.1320250522.
<span class="bold">PMID: </span><a href="/pubmed/3087181" target="_blank">3087181</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22EEG%20abnormality%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 (91)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/39178551">Novel and reappraised wide-band EEG findings in migraineurs: Its correlation with several clinical variables.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hosokawa K,
Usami K,
Tatsuoka Y,
Danno D,
Takeshima T,
Tatsuoka Y,
Takahashi R,
Ikeda A</span><br />
<span class="medgenPMjournal">Clin Neurophysiol</span>
2024 Oct;166:166-175.
Epub 2024 Aug 2
doi: 10.1016/j.clinph.2024.07.020.
<span class="bold">PMID: </span><a href="/pubmed/39178551" target="_blank">39178551</a></div>
<div class="nl"><a target="_blank" href="/pubmed/38813513">Electroencephalographic abnormalities in children with type 1 diabetes mellitus: a prospective study.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yildirim R,
Günbey C</span><br />
<span class="medgenPMjournal">Turk J Med Sci</span>
2023;53(6):1794-1798.
Epub 2023 Oct 12
doi: 10.55730/1300-0144.5749.
<span class="bold">PMID: </span><a href="/pubmed/38813513" target="_blank">38813513</a><a href="/pmc/articles/PMC10760570" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/35101840">Electroclinical biomarkers of autoimmune encephalitis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Wesselingh R,
Broadley J,
Buzzard K,
Tarlinton D,
Seneviratne U,
Kyndt C,
Stankovich J,
Sanfilippo P,
Nesbitt C,
D'Souza W,
Macdonell R,
Butzkueven H,
O'Brien TJ,
Monif M</span><br />
<span class="medgenPMjournal">Epilepsy Behav</span>
2022 Mar;128:108571.
Epub 2022 Jan 29
doi: 10.1016/j.yebeh.2022.108571.
<span class="bold">PMID: </span><a href="/pubmed/35101840" target="_blank">35101840</a></div>
<div class="nl"><a target="_blank" href="/pubmed/22925838">Fixation-off sensitivity.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Brigo F,
Rossini F,
Stefani A,
Nardone R,
Tezzon F,
Fiaschi A,
Manganotti P,
Bongiovanni LG</span><br />
<span class="medgenPMjournal">Clin Neurophysiol</span>
2013 Feb;124(2):221-7.
Epub 2012 Aug 24
doi: 10.1016/j.clinph.2012.07.017.
<span class="bold">PMID: </span><a href="/pubmed/22925838" target="_blank">22925838</a></div>
<div class="nl"><a target="_blank" href="/pubmed/2929744">Postcardiotomy delirium: conclusions after 25 years?</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Smith LW,
Dimsdale JE</span><br />
<span class="medgenPMjournal">Am J Psychiatry</span>
1989 Apr;146(4):452-8.
doi: 10.1176/ajp.146.4.452.
<span class="bold">PMID: </span><a href="/pubmed/2929744" target="_blank">2929744</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22EEG%20abnormality%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 (100)</a></div></div>
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<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Recent_systematic_reviews">Recent systematic reviews</h1><a sid="104" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln">
<div class="nl"><a target="_blank" href="/pubmed/33475161">Seizures in autoimmune encephalitis-A systematic review and quantitative synthesis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Yeshokumar AK,
Coughlin A,
Fastman J,
Psaila K,
Harmon M,
Randell T,
Schorr EM,
Han H,
Hoang H,
Soudant C,
Jette N</span><br />
<span class="medgenPMjournal">Epilepsia</span>
2021 Feb;62(2):397-407.
Epub 2021 Jan 21
doi: 10.1111/epi.16807.
<span class="bold">PMID: </span><a href="/pubmed/33475161" target="_blank">33475161</a></div>
<div class="nl"><a target="_blank" href="/pubmed/23740534">Treatment of infantile spasms.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hancock EC,
Osborne JP,
Edwards SW</span><br />
<span class="medgenPMjournal">Cochrane Database Syst Rev</span>
2013 Jun 5;2013(6):CD001770.
doi: 10.1002/14651858.CD001770.pub3.
<span class="bold">PMID: </span><a href="/pubmed/23740534" target="_blank">23740534</a><a href="/pmc/articles/PMC11194850" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/23405072">Predictors of seizure outcomes in children with tuberous sclerosis complex and intractable epilepsy undergoing resective epilepsy surgery: an individual participant data meta-analysis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Fallah A,
Guyatt GH,
Snead OC 3rd,
Ebrahim S,
Ibrahim GM,
Mansouri A,
Reddy D,
Walter SD,
Kulkarni AV,
Bhandari M,
Banfield L,
Bhatnagar N,
Liang S,
Teutonico F,
Liao J,
Rutka JT</span><br />
<span class="medgenPMjournal">PLoS One</span>
2013;8(2):e53565.
Epub 2013 Feb 6
doi: 10.1371/journal.pone.0053565.
<span class="bold">PMID: </span><a href="/pubmed/23405072" target="_blank">23405072</a><a href="/pmc/articles/PMC3566144" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/18843624">Treatment of infantile spasms.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hancock EC,
Osborne JP,
Edwards SW</span><br />
<span class="medgenPMjournal">Cochrane Database Syst Rev</span>
2008 Oct 8;(4):CD001770.
doi: 10.1002/14651858.CD001770.pub2.
<span class="bold">PMID: </span><a href="/pubmed/18843624" target="_blank">18843624</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22EEG%20abnormality%22%20AND%20systematic%5Bsb%5D%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>
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<div class="portlet_content ln"><ul><li><a href="/gtr/tests?term=C0151611%5bDISCUI%5d&amp;filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (38)</a></li>
<li><a href="/gtr/tests?term=C0151611%5bDISCUI%5d&amp;filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (38)</a></li>
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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=(%22eeg%20abnormality%22%5Btiab%3A~0%5D)%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><li><a target="_blank" href="/books/?term=((%22clinical%20guidelines%22%5BResource%20Type%5D)%20OR%20%22practice%20guideline%22%5BPublication%20Type%5D)%20AND%20(%22EEG%20abnormality%22)">Bookshelf</a><div class="help-popup">See practice and clinical guidelines in NCBI Bookshelf. 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="ralinkpop offscreen_noflow">SNRPN small nuclear ribonucleoprotein polypeptide N [Homo sapiens]<div class="brieflinkpopdesc">Gene ID:6638</div></div>
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