nih-gov/www.ncbi.nlm.nih.gov/medgen/C0036161/index.html

1173 lines
No EOL
146 KiB
HTML
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head xmlns:xi="http://www.w3.org/2001/XInclude"><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- meta -->
<meta name="keywords" content="C0036161, beta-hexosaminidase-beta-subunit deficiency, deficiency disease, hexosaminidase a and b, disease or syndrome, disease, sandhoff-jatzkewitz-pilz, g(m2) gangliosidosis, type ii, gangliosidosis g(m2), type ii, gangliosidosis gm2, type ii, gm2 gangliosidosis 0 variant, gm2 gangliosidosis, 0 variant, gm2 gangliosidosis, type 2, gm2 gangliosidosis, type ii, gm2-gangliosidoses, type ii, gm2-gangliosidosis, type 2, gm2-gangliosidosis, type ii, gm&gt;2&lt; gangliosidosis, type 2, hexb, hexosaminidase a and b deficiency, hexosaminidase a and b deficiency disease, hexosaminidases a and b deficiency, o variant, sandhoff disease, sandhoff disease, adult type, sandhoff disease, infantile type, sandhoff disease, infantile, juvenile, and adult forms, sandhoff disease, juvenile type, sandhoff jatzkewitz disease, sandhoff jatzkewitz pilz disease, sandhoff's disease, sandhoff-jatzkewitz-pilz disease, sandhoffs disease, total hexosaminidase deficiency, type ii gm2-gangliosidoses, type ii gm2-gangliosidosis, 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="Sandhoff disease comprises a phenotypic continuum encompassing acute infantile, subacute juvenile, and late-onset disease. Although classification into these phenotypes is somewhat arbitrary, it is helpful in understanding the variation observed in the timing of disease onset, presenting manifestations, rate of progression, and life span. Acute infantile Sandhoff disease (onset age &lt;6 months). Infants are generally normal at birth followed by progressive weakness and slowing of developmental progress, then developmental regression and severe neurologic impairment. Seizures are common. Death usually occurs between ages two and three years. Subacute juvenile Sandhoff disease (onset age 2-5 years). After attaining normal developmental milestones, developmental progress slows, followed by developmental regression and neurologic impairment (abnormal gait, dysarthria, and cognitive decline). Death (usually from aspiration) typically occurs in the early to late teens. Late-onset Sandhoff disease (onset older teen years or young adulthood). Nearly normal psychomotor development is followed by a range of neurologic findings (e.g., weakness, spasticity, dysarthria, and deficits in cerebellar function) and psychiatric findings (e.g., deficits in executive function and memory). Life expectancy is not necessarily decreased." /><meta name="robots" content="index,nofollow,noarchive" />
<meta name="ncbi_app" content="entrez" /><meta name="ncbi_db" content="medgen" /><meta name="ncbi_term" content="c0036161[conceptid]" /><meta name="ncbi_report" content="fullreport" /><meta name="ncbi_format" content="html" /><meta name="ncbi_pagesize" content="20" /><meta name="ncbi_sortorder" content="default" /><meta name="ncbi_pageno" content="1" /><meta name="ncbi_resultcount" content="1" /><meta name="ncbi_op" content="search" /><meta name="ncbi_pdid" content="fullreport" /><meta name="ncbi_sessionid" content="CE8B5AF87C7FFCB1_0191SID" /><meta name="ncbi_filter" content="clinical" /><meta name="ncbi_stat" content="false" /><meta name="ncbi_hitstat" content="false" />
<!-- title -->
<title>Sandhoff disease (Concept Id: C0036161)
- MedGen - NCBI</title>
<!-- Common JS and CSS -->
<script type="text/javascript">
var ncbi_startTime = new Date();
</script>
<script type="text/javascript" src="https://static.pubmed.gov/core/jig/1.15.10/js/jig.min.js"></script>
<link xmlns="http://www.w3.org/1999/xhtml" type="text/css" rel="stylesheet" href="//static.pubmed.gov/portal/portal3rc.fcgi/4218191/css/4207974/4206132.css" xml:base="http://127.0.0.1/sites/static/header_footer/" />
<link rel="shortcut icon" href="//www.ncbi.nlm.nih.gov/favicon.ico" /><meta name="ncbi_phid" content="CE8D91957CA727210000000000A90092.m_34" /><script type="text/javascript"><!--
var ScriptPath = '/portal/';
var objHierarchy = {"name":"EntrezSystem2","type":"Layout","realname":"EntrezSystem2",
"children":[{"name":"EntrezSystem2.PEntrez","type":"Cluster","realname":"EntrezSystem2.PEntrez",
"children":[{"name":"EntrezSystem2.PEntrez.DbConnector","type":"Portlet","realname":"EntrezSystem2.PEntrez.PEntrez.DbConnector","shortname":"DbConnector"},
{"name":"EntrezSystem2.PEntrez.ParamContainer","type":"Portlet","realname":"EntrezSystem2.PEntrez.PEntrez.ParamContainer","shortname":"ParamContainer"},
{"name":"EntrezSystem2.PEntrez.MyNcbi","type":"Portlet","realname":"EntrezSystem2.PEntrez.PEntrez.MyNcbi","shortname":"MyNcbi"},
{"name":"EntrezSystem2.PEntrez.UserPreferenceUrlParamContainer","type":"Portlet","realname":"EntrezSystem2.PEntrez.PEntrez.UserPreferenceUrlParamContainer","shortname":"UserPreferenceUrlParamContainer"},
{"name":"EntrezSystem2.PEntrez.GridProperty","type":"Portlet","realname":"EntrezSystem2.PEntrez.PEntrez.GridProperty","shortname":"GridProperty"},
{"name":"EntrezSystem2.PEntrez.MedGen","type":"Cluster","realname":"EntrezSystem2.PEntrez.MedGen",
"children":[{"name":"EntrezSystem2.PEntrez.MedGen.NoPortlet","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.NoPortlet","shortname":"NoPortlet"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_PageController","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_PageController","shortname":"MedGen_PageController"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_SearchBar","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_SearchBar","shortname":"MedGen_SearchBar"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_BotRequest","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_BotRequest","shortname":"MedGen_BotRequest"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_LimitsTab","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_LimitsTab","shortname":"MedGen_LimitsTab"},
{"name":"EntrezSystem2.PEntrez.MedGen.Entrez_Facets","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.Entrez_Facets","shortname":"Entrez_Facets"},
{"name":"EntrezSystem2.PEntrez.MedGen.Entrez_Clipboard","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.Entrez_Clipboard","shortname":"Entrez_Clipboard"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_StaticParts","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_StaticParts","shortname":"MedGen_StaticParts"},
{"name":"EntrezSystem2.PEntrez.MedGen.Entrez_Messages","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.Entrez_Messages","shortname":"Entrez_Messages"},
{"name":"EntrezSystem2.PEntrez.MedGen.NcbiJSCheck","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.NcbiJSCheck","shortname":"NcbiJSCheck"},
{"name":"EntrezSystem2.PEntrez.MedGen.NCBIFooter_dynamic","type":"Cluster","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.NCBIFooter_dynamic",
"children":[{"name":"EntrezSystem2.PEntrez.MedGen.NCBIFooter_dynamic.Footer_ExtraData","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.NCBIFooter_dynamic.Footer_ExtraData","shortname":"Footer_ExtraData"},
{"name":"EntrezSystem2.PEntrez.MedGen.NCBIFooter_dynamic.NCBIFooter_dynamic","type":"Cluster","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.NCBIFooter_dynamic.NCBIFooter_dynamic",
"children":[{"name":"EntrezSystem2.PEntrez.MedGen.NCBIFooter_dynamic.NCBIFooter_dynamic.NCBIBreadcrumbs","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.NCBIFooter_dynamic.NCBIFooter_dynamic.NCBIBreadcrumbs","shortname":"NCBIBreadcrumbs"},
{"name":"EntrezSystem2.PEntrez.MedGen.NCBIFooter_dynamic.NCBIFooter_dynamic.NCBIHelpDesk","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.NCBIFooter_dynamic.NCBIFooter_dynamic.NCBIHelpDesk","shortname":"NCBIHelpDesk"},
{"name":"EntrezSystem2.PEntrez.MedGen.NCBIFooter_dynamic.NCBIFooter_dynamic.NCBIApplog_NoScript_Ping","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.Entrez_Database.NCBIFooter_dynamic.NCBIFooter_dynamic.NCBIApplog_NoScript_Ping","shortname":"NCBIApplog_NoScript_Ping"}]}]},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel","type":"Cluster","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel",
"children":[{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.blankToolPanel","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.blankToolPanel","shortname":"blankToolPanel"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_ResultsController","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_ResultsController","shortname":"MedGen_ResultsController"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_FiltersPortlet","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_FiltersPortlet","shortname":"MedGen_FiltersPortlet"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_Pager","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.Entrez_Pager","shortname":"Entrez_Pager"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar","shortname":"MedGen_DisplayBar"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HelpFormAttributes","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.HelpFormAttributes","shortname":"HelpFormAttributes"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_Collections","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.Entrez_Collections","shortname":"Entrez_Collections"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.SpellCheck","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.SpellCheck","shortname":"SpellCheck"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.SearchEngineReferralCheck","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.SearchEngineReferralCheck","shortname":"SearchEngineReferralCheck"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.WrongDbSensor","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.WrongDbSensor","shortname":"WrongDbSensor"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.KnowledgePanel","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.KnowledgePanel","shortname":"KnowledgePanel"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.HistoryDisplay","shortname":"HistoryDisplay"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Discovery_SearchDetails","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.Entrez_ResultsPanel.Discovery_SearchDetails","shortname":"Discovery_SearchDetails"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.mg_GeneSensor","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.mg_GeneSensor","shortname":"mg_GeneSensor"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_ClinFeatureSearch","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_ClinFeatureSearch","shortname":"MedGen_ClinFeatureSearch"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVFull","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVFull","shortname":"MedGen_RVFull"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster","type":"Cluster","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster",
"children":[{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenDiscoveryDbLinks","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenDiscoveryDbLinks","shortname":"MedGenDiscoveryDbLinks"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGen_SingleItemSupl","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGen_SingleItemSupl","shortname":"MedGen_SingleItemSupl"},
{"name":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews","type":"Portlet","realname":"EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews","shortname":"MedGenReviews"}]}]}]}]}]};
--></script>
<meta name='referrer' content='origin-when-cross-origin'/><link type="text/css" rel="stylesheet" href="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/css/3808861/3917732/3974050/3751656/3395415/4221762/14534/4062871/4186458/4075711/12930/4033350/4128070/3861632/4013176/4212357/4064428/4186491/9685/2279/3395586.css" /><link type="text/css" rel="stylesheet" href="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/css/3501913/1303451.css" media="print" /><script type="text/javascript">
var ObjectLinks=[{i:0, ename: "p$ExL", esid:"*", sname: "p$ExL", ssid:"*", dname:"p$el", dsid:"0",m:"CopyValue",p:[],f: function(src, dst) {fn_CopyValue(src, dst);}}]
var ActiveNames = {"p$ExL":1, "EntrezSystem2.PEntrez.DbConnector.Cmd":0, "EntrezSystem2.PEntrez.DbConnector.Db":0, "EntrezSystem2.PEntrez.DbConnector.IdsFromResult":0, "EntrezSystem2.PEntrez.DbConnector.LastDb":0, "EntrezSystem2.PEntrez.DbConnector.LastIdsFromResult":0, "EntrezSystem2.PEntrez.DbConnector.LastQueryKey":0, "EntrezSystem2.PEntrez.DbConnector.LastTabCmd":0, "EntrezSystem2.PEntrez.DbConnector.LinkName":0, "EntrezSystem2.PEntrez.DbConnector.LinkReadableName":0, "EntrezSystem2.PEntrez.DbConnector.LinkSrcDb":0, "EntrezSystem2.PEntrez.DbConnector.QueryKey":0, "EntrezSystem2.PEntrez.DbConnector.TabCmd":0, "EntrezSystem2.PEntrez.DbConnector.Term":0, "EntrezSystem2.PEntrez.MedGen.MedGen_PageController.PreviousPageName":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.ClearHistory":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.Cmd":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryOn":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryToggle":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.Shutter":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.Display":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.FFormat":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.FileFormat":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.Format":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.LastFormat":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.LastPageSize":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.LastPresentation":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.PageSize":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.Presentation":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.PrevPageSize":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.PrevPresentation":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.PrevSort":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SendTo":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SendToSubmit":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SetDisplay":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.sPresentation":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_ResultsController.ResultCount":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_ResultsController.RunLastQuery":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenDiscoveryDbLinks.Shutter":0, "EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews.Shutter":0};
</script></head>
<body>
<div class="grid">
<div class="col twelve_col nomargin shadow">
<form enctype="application/x-www-form-urlencoded" name="EntrezForm" method="post" onsubmit="return false;" action="/medgen" id="EntrezForm">
<div xmlns:xi="http://www.w3.org/2001/XInclude">
<!-- no javascript message -->
<noscript>
<p class="nojs">
<strong>Warning:</strong>
The NCBI web site requires JavaScript to function.
<a href="/guide/browsers/#enablejs" title="Learn how to enable JavaScript" target="_blank">more...</a>
</p>
</noscript>
<div xmlns="http://www.w3.org/1999/xhtml" id="universal_header" xml:base="http://127.0.0.1/sites/static/header_footer/">
<section class="usa-banner">
<div class="usa-accordion">
<header class="usa-banner-header">
<div class="usa-grid usa-banner-inner">
<img src="https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/favicons/favicon-57.png" alt="U.S. flag" />
<p>An official website of the United States government</p>
<button class="non-usa-accordion-button usa-banner-button" aria-expanded="false" aria-controls="gov-banner-top" type="button">
<span class="usa-banner-button-text">Here's how you know</span>
</button>
</div>
</header>
<div class="usa-banner-content usa-grid usa-accordion-content" id="gov-banner-top" aria-hidden="true">
<div class="usa-banner-guidance-gov usa-width-one-half">
<img class="usa-banner-icon usa-media_block-img" src="https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-dot-gov.svg" alt="Dot gov" />
<div class="usa-media_block-body">
<p>
<strong>The .gov means it's official.</strong>
<br />
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you're on a federal
government site.
</p>
</div>
</div>
<div class="usa-banner-guidance-ssl usa-width-one-half">
<img class="usa-banner-icon usa-media_block-img" src="https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-https.svg" alt="Https" />
<div class="usa-media_block-body">
<p>
<strong>The site is secure.</strong>
<br />
The <strong>https://</strong> ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
</p>
</div>
</div>
</div>
</div>
</section>
<div class="usa-overlay"></div>
<header class="ncbi-header" role="banner" data-section="Header">
<div class="usa-grid">
<div class="usa-width-one-whole">
<div class="ncbi-header__logo">
<a href="/" class="logo" aria-label="NCBI Logo" data-ga-action="click_image" data-ga-label="NIH NLM Logo">
<img src="https://www.ncbi.nlm.nih.gov/coreutils/nwds/img/logos/AgencyLogo.svg" alt="NIH NLM Logo" />
</a>
</div>
<div class="ncbi-header__account">
<a id="account_login" href="https://account.ncbi.nlm.nih.gov" class="usa-button header-button" style="display:none" data-ga-action="open_menu" data-ga-label="account_menu">Log in</a>
<button id="account_info" class="header-button" style="display:none" aria-controls="account_popup" type="button">
<span class="fa fa-user" aria-hidden="true">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="20px" height="20px">
<g style="fill: #fff">
<ellipse cx="12" cy="8" rx="5" ry="6"></ellipse>
<path d="M21.8,19.1c-0.9-1.8-2.6-3.3-4.8-4.2c-0.6-0.2-1.3-0.2-1.8,0.1c-1,0.6-2,0.9-3.2,0.9s-2.2-0.3-3.2-0.9 C8.3,14.8,7.6,14.7,7,15c-2.2,0.9-3.9,2.4-4.8,4.2C1.5,20.5,2.6,22,4.1,22h15.8C21.4,22,22.5,20.5,21.8,19.1z"></path>
</g>
</svg>
</span>
<span class="username desktop-only" aria-hidden="true" id="uname_short"></span>
<span class="sr-only">Show account info</span>
</button>
</div>
<div class="ncbi-popup-anchor">
<div class="ncbi-popup account-popup" id="account_popup" aria-hidden="true">
<div class="ncbi-popup-head">
<button class="ncbi-close-button" data-ga-action="close_menu" data-ga-label="account_menu" type="button">
<span class="fa fa-times">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48" width="24px" height="24px">
<path d="M38 12.83l-2.83-2.83-11.17 11.17-11.17-11.17-2.83 2.83 11.17 11.17-11.17 11.17 2.83 2.83 11.17-11.17 11.17 11.17 2.83-2.83-11.17-11.17z"></path>
</svg>
</span>
<span class="usa-sr-only">Close</span></button>
<h4>Account</h4>
</div>
<div class="account-user-info">
Logged in as:<br />
<b><span class="username" id="uname_long">username</span></b>
</div>
<div class="account-links">
<ul class="usa-unstyled-list">
<li><a id="account_myncbi" href="/myncbi/" class="set-base-url" data-ga-action="click_menu_item" data-ga-label="account_myncbi">Dashboard</a></li>
<li><a id="account_pubs" href="/myncbi/collections/bibliography/" class="set-base-url" data-ga-action="click_menu_item" data-ga-label="account_pubs">Publications</a></li>
<li><a id="account_settings" href="/account/settings/" class="set-base-url" data-ga-action="click_menu_item" data-ga-label="account_settings">Account settings</a></li>
<li><a id="account_logout" href="/account/signout/" class="set-base-url" data-ga-action="click_menu_item" data-ga-label="account_logout">Log out</a></li>
</ul>
</div>
</div>
</div>
</div>
</div>
</header>
<div role="navigation" aria-label="access keys">
<a id="nws_header_accesskey_0" href="https://www.ncbi.nlm.nih.gov/guide/browsers/#ncbi_accesskeys" class="usa-sr-only" accesskey="0" tabindex="-1">Access keys</a>
<a id="nws_header_accesskey_1" href="https://www.ncbi.nlm.nih.gov" class="usa-sr-only" accesskey="1" tabindex="-1">NCBI Homepage</a>
<a id="nws_header_accesskey_2" href="/myncbi/" class="set-base-url usa-sr-only" accesskey="2" tabindex="-1">MyNCBI Homepage</a>
<a id="nws_header_accesskey_3" href="#maincontent" class="usa-sr-only" accesskey="3" tabindex="-1">Main Content</a>
<a id="nws_header_accesskey_4" href="#" class="usa-sr-only" accesskey="4" tabindex="-1">Main Navigation</a>
</div>
<section data-section="Alerts">
<div class="ncbi-alerts-placeholder"></div>
</section>
</div>
<div class="header">
<!-- logo -->
<div class="res_logo" id="gene-top">
<h1 class="res_name"><a href="/medgen">MedGen</a></h1>
<h2 class="res_tagline">National Center for Biotechnology Information</h2>
</div>
<!-- SearchBar -->
<div class="search"><div class="search_form"><label for="database" class="offscreen_noflow">Search database</label><select id="database"><optgroup label="Recent"><option value="medgen" selected="selected" data-ac_dict="medgen_disease_name">MedGen</option><option value="clinvar">ClinVar</option><option value="pubmed" data-ac_dict="pm_related_queries_2">PubMed</option><option value="biocollections" class="last">Biocollections</option></optgroup><optgroup label="All"><option value="gquery">All Databases</option><option value="assembly">Assembly</option><option value="biocollections">Biocollections</option><option value="bioproject">BioProject</option><option value="biosample">BioSample</option><option value="books">Books</option><option value="clinvar">ClinVar</option><option value="cdd">Conserved Domains</option><option value="gap">dbGaP</option><option value="dbvar">dbVar</option><option value="gene">Gene</option><option value="genome">Genome</option><option value="gds">GEO DataSets</option><option value="geoprofiles">GEO Profiles</option><option value="gtr">GTR</option><option value="ipg">Identical Protein Groups</option><option value="medgen" data-ac_dict="medgen_disease_name">MedGen</option><option value="mesh" data-ac_dict="mesh_suggestions">MeSH</option><option value="nlmcatalog">NLM Catalog</option><option value="nuccore">Nucleotide</option><option value="omim">OMIM</option><option value="pmc">PMC</option><option value="protein">Protein</option><option value="proteinclusters">Protein Clusters</option><option value="protfam">Protein Family Models</option><option value="pcassay">PubChem BioAssay</option><option value="pccompound">PubChem Compound</option><option value="pcsubstance">PubChem Substance</option><option value="pubmed" data-ac_dict="pm_related_queries_2">PubMed</option><option value="snp">SNP</option><option value="sra">SRA</option><option value="structure">Structure</option><option value="taxonomy">Taxonomy</option><option value="toolkit">ToolKit</option><option value="toolkitall">ToolKitAll</option><option value="toolkitbookgh">ToolKitBookgh</option></optgroup></select><div class="nowrap"><label for="term" class="offscreen_noflow" accesskey="/">Search term</label><div class="nowrap"><input type="text" name="term" id="term" title="Search MedGen. Use up and down arrows to choose an item from the autocomplete." value="" class="jig-ncbiclearbutton jig-ncbiautocomplete" data-jigconfig="dictionary:'medgen_disease_name',disableUrl:'NcbiSearchBarAutoComplCtrl'" autocomplete="off" data-sbconfig="ds:'no',pjs:'yes',afs:'yes'" /></div><button id="search" type="submit" class="button_search nowrap" cmd="go">Search</button></div></div><ul class="searchlinks inline_list"><set></set><li><a name="SaveSearch" title="Click to create an email alert for this search" href="/sites/myncbi/searches/save?db=medgen&amp;qk=16538" id="SaveSearch">Create alert</a></li><li><a sid="1" href="/medgen/limits">Limits</a></li><li><a href="/medgen/advanced">Advanced</a></li><li class="help"><a id="help" class="jig-ncbihelpwindow" target="ncbihelp" name="help" href="/medgen/docs/help">Help</a></li></ul></div>
</div>
<input name="EntrezSystem2.PEntrez.MedGen.MedGen_PageController.PreviousPageName" sid="1" type="hidden" value="results" />
<div id="maincontent" class="col nine_col">
<div class="content">
<div>
</div>
<div class="results_settings one_setting"><ul class="inline_list left display_settings"><li><a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.Display" sid="0" href="#" class="jig-ncbipopper" data-jigconfig="triggerPosition : 'bottom center',destPosition : 'top center',destSelector : '#display_settings_menu_report', hasArrow : false,openEvent : 'click',closeEvent : 'click',isTriggerElementCloseClick: false,addCloseButton : false, groupName: 'entrez_pg'" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.Display">Full Report<span href="#" class="tgt_dark"></span></a></li></ul><div id="display_settings_menu_report" class="disp_settings tabPopper"><fieldset class="format"><legend>Format</legend><ul class="column_list"><li><input type="radio" name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.sPresentation" sid="1" value="FullReport" format="" id="FullReport" checked="true" /><label for="FullReport">Full Report</label></li><li><input type="radio" name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.sPresentation" sid="2" value="FullReport" format="text" id="FullReporttext" /><label for="FullReporttext">Summary (Text)</label></li><li><input type="radio" name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.sPresentation" sid="3" value="XML" format="text" id="XMLtext" /><label for="XMLtext">Summary (XML)</label></li></ul></fieldset></div><button name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SetDisplay" sid="1" class="button_apply ncbipopper-close-button" style="display:none">Apply</button><h4 class="content_header send_to align_right jig-ncbipopper" id="sendto" data-jigconfig="triggerPosition:'bottom center', destPosition : 'top center',destSelector : '#send_to_menu', hasArrow : false, openEvent : 'click',closeEvent : 'click', isTriggerElementCloseClick: false, addCloseButton:true, groupName: 'entrez_pg', adjustFit:'none'"><a href="#" sourceContent="send_to_menu" class="tgt_dark">Send to:</a><script type="text/javascript">
jQuery(document).ready( function () {
jQuery("#send_to_menu input[type='radio']").click( function () {
var selectedValue = jQuery(this).val().toLowerCase();
var selectedDiv = jQuery("#send_to_menu div." + selectedValue);
if(selectedDiv.is(":hidden")){
jQuery("#send_to_menu div.submenu:visible").slideUp();
selectedDiv.slideDown();
}
});
});
jQuery("#sendto").bind("ncbipopperclose", function(){
jQuery("#send_to_menu div.submenu:visible").css("display","none");
jQuery("#send_to_menu input[type='radio']:checked").attr("checked",false);
});
</script></h4><div id="send_to_menu" class="tabPopper send_to"><fieldset><legend>Choose Destination</legend><ul class="column_list"><li><input type="radio" name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SendTo" sid="1" value="File" id="dest_File" /><label for="dest_File">File</label></li><li><input type="radio" name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SendTo" sid="2" value="AddToClipboard" id="dest_AddToClipboard" /><label for="dest_AddToClipboard">Clipboard</label></li><li><input type="radio" name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SendTo" sid="3" value="AddToCollections" id="dest_AddToCollections" /><label for="dest_AddToCollections">Collections</label></li></ul></fieldset><div class="submenu file" id="submenu_File" style="display: none;"><p id="submenu_File_hint" class="hidden"></p><ul><li><label for="file_format">Format</label><select id="file_format" name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.FFormat" sid="1"><option value="FullReport" format="text" selected="selected">Summary (Text)</option><option value="XML" format="text">Summary (XML)</option></select></li></ul><button name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SendToSubmit" sid="1" class="button_apply file ncbipopper-close-button" type="submit" cmd="File">Create File</button></div><div class="submenu addtoclipboard" id="submenu_AddToClipboard" style="display: none;"><p id="submenu_AddToClipboard_hint" class="hidden"></p><button name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SendToSubmit" sid="2" class="button_apply clipboard ncbipopper-close-button" type="submit" cmd="AddToClipboard">Add to Clipboard</button></div><div class="submenu addtocollections" id="submenu_AddToCollections" style="display: none;"><p id="submenu_AddToCollections_hint" class="hidden"></p><button name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.SendToSubmit" sid="3" class="button_apply collections ncbipopper-close-button" type="submit" cmd="AddToCollections">Add to Collections</button></div></div><div><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.FileFormat" sid="1" type="hidden" value="FullReport" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.LastPresentation" sid="1" type="hidden" value="FullReport" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.Presentation" sid="1" type="hidden" value="FullReport" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.PageSize" sid="1" type="hidden" value="20" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.LastPageSize" sid="1" type="hidden" value="20" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.Format" sid="1" type="hidden" value="" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.LastFormat" sid="1" type="hidden" value="" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.PrevPageSize" sid="1" type="hidden" value="20" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.PrevPresentation" sid="1" type="hidden" value="FullReport" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_DisplayBar.PrevSort" sid="1" type="hidden" value="" /><input type="hidden" id="coll_startindex" name="CollectionStartIndex" value="1" /></div></div>
<div class="">
<div><span id="result_sel" class="nowrap"></span><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_ResultsController.ResultCount" sid="1" type="hidden" id="resultcount" value="1" /><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_ResultsController.RunLastQuery" sid="1" type="hidden" /></div>
</div>
<div id="messagearea" class="empty">
</div>
<div><div class="rprt full-rprt"><div class="portlet" style="border-top-style: none; margin-top: 0px; padding-top: 0px; margin-bottom: 0px; padding-left: 0.2em;">
<!--
UID=11313
ConceptID=C0036161
-->
<!--imgCountBooks = 0--><h1 class="medgenTitle"><div class="MedGenTitleText">Sandhoff disease</div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>11313</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:">C0036161</span></a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div><table class="medgenTable"><tbody><tr><td>Synonyms:</td>
<td>Beta-hexosaminidase-beta-subunit deficiency; GM2 gangliosidosis, type 2; GM2-GANGLIOSIDOSIS, TYPE II; Hexosaminidase A and B deficiency Disease; HEXOSAMINIDASES A AND B DEFICIENCY; Sandhoff-Jatzkewitz-Pilz disease; Total hexosaminidase deficiency</td></tr>
<tr><td><span class="bold">SNOMED CT: </span></td>
<td>Sandhoff disease (23849003); GM&gt;2&lt; gangliosidosis, type 2 (23849003); Hexosaminidase A AND B deficiency (23849003); Total hexosaminidase deficiency (23849003); O variant (23849003)</td></tr>
<tr><td>Modes of inheritance:</td>
<td>
<div class="divPopper rprt" id="moi_141025"><div><strong>Autosomal recessive inheritance</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>141025</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.">C0441748</a></dd><dt><span class="dotprefix"></span></dt><dd>Intellectual Product</dd></dl></div></div></div>
<div class="spaceAbove">Source: Orphanet</div>
<div class="spaceAbove">A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele).</div></div>
<div class="hangingIndent"><a title="click for more information" class="jig-ncbipopper" href="#moi_141025" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Autosomal recessive inheritance</a><span> (Orphanet)</span></div></td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td><a class="help jig-ncbi-popper" data-jig="ncbipopper" href="#target-gene-loc">Gene (location):<img class="pulldown" src="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/img/4204968" /></a><div class="display-none" id="target-gene-loc">
Gene(s) directly associated with<br />
this condition or phenotype.</div></td>
<td><a target="_blank" title="HEXB - ID: 3074 - NCBI Gene" href="/gene/3074" class="medgenPMinfo">HEXB</a> (5q13.3)</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td>Monarch Initiative:</td>
<td><a href="https://monarchinitiative.org/disease/MONDO:0010006" target="_blank">MONDO:0010006</a></td></tr>
<tr><td>OMIM<span class="superscript">®</span>:</td>
<td><a href="https://omim.org/entry/268800" target="_blank">268800</a></td></tr>
<tr><td>Orphanet:</td>
<td><a target="_blank" title="Orphanet: The portal for rare diseases and orphan drugs" href="http://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&amp;Expert=796">ORPHA796</a></td></tr></tbody></table></div><div class="rprt-body jig-ncbiinpagenav" data-jigconfig="smoothScroll: false, gotoTopLink: true, gotoTopLinkText: '', gotoTopLinkAttrs: {'title': 'Go to the top of the page'},allHeadingLevels: ['h1'], topOfPageTOC: true, tocId: 'my-toc'"><div id="rprt-tabs-1" class="rprt-tab"><div id="tb-termsProp-1"><div class="leftCol mgCol"><div>
<div class="portlet mgSection" id="ID_101">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Disease_characteristics">Disease characteristics</h1><a sid="101" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><div class="excerpt">Excerpted from the <i>GeneReview: </i><a href="/books/NBK579484" target="_blank">Sandhoff Disease</a></div><div>Sandhoff disease comprises a phenotypic continuum encompassing acute infantile, subacute juvenile, and late-onset disease. Although classification into these phenotypes is somewhat arbitrary, it is helpful in understanding the variation observed in the timing of disease onset, presenting manifestations, rate of progression, and life span. Acute infantile Sandhoff disease (onset age &lt;6 months). Infants are generally normal at birth followed by progressive weakness and slowing of developmental progress, then developmental regression and severe neurologic impairment. Seizures are common. Death usually occurs between ages two and three years. Subacute juvenile Sandhoff disease (onset age 2-5 years). After attaining normal developmental milestones, developmental progress slows, followed by developmental regression and neurologic impairment (abnormal gait, dysarthria, and cognitive decline). Death (usually from aspiration) typically occurs in the early to late teens. Late-onset Sandhoff disease (onset older teen years or young adulthood). Nearly normal psychomotor development is followed by a range of neurologic findings (e.g., weakness, spasticity, dysarthria, and deficits in cerebellar function) and psychiatric findings (e.g., deficits in executive function and memory). Life expectancy is not necessarily decreased. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</div><div class="spaceAbove"><strong>Full text of <i>GeneReview</i> (by section):</strong><br /><a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Summary" target="NBK579484">Summary</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.GeneReview_Scope" target="NBK579484">GeneReview Scope</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Diagnosis" target="NBK579484">Diagnosis</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Clinical_Characteristics" target="NBK579484">Clinical Characteristics</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Genetically_Related_Allelic_Dis" target="NBK579484">Genetically Related (Allelic) Disorders</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Differential_Diagnosis" target="NBK579484">Differential Diagnosis</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Management" target="NBK579484">Management</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Genetic_Counseling" target="NBK579484">Genetic Counseling</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Resources" target="NBK579484">Resources</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Molecular_Genetics" target="NBK579484">Molecular Genetics</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.Chapter_Notes" target="NBK579484">Chapter Notes</a>  |  <a class="medgenPMinfo" href="/books/NBK579484#sandhoff.References" target="NBK579484">References</a></div><div class="spaceAbove"><strong>Authors:</strong><br />
Changrui Xiao  |  Cynthia Tifft  |  Camilo Toro   <a href="/books/NBK579484" target="NBK579484" title="NCBI Bookshelf: Sandhoff Disease">view full author information</a></div></div>
</div>
<div class="portlet mgSection" id="ID_117">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Additional_descriptions">Additional descriptions</h1><a sid="117" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><div class="mgSection"><strong>From OMIM</strong><br />Sandhoff disease is a progressive neurodegenerative disorder characterized by an accumulation of GM2 gangliosides, particularly in neurons, and is clinically indistinguishable from Tay-Sachs disease (272800).  <a target="_blank" href="http://www.omim.org/entry/268800">http://www.omim.org/entry/268800</a></div><div class="mgSection"><strong>From MedlinePlus Genetics</strong><br />Sandhoff disease is a rare inherited disorder that progressively destroys nerve cells (neurons) in the brain and spinal cord (central nervous system). This condition is classified into three major types based on the age at which signs and symptoms first appear: infantile, juvenile, and adult.<br /><br />The infantile form of Sandhoff disease is the most common and severe form and becomes apparent in infancy. Infants with this disorder typically appear normal until the age of 3 to 6 months, when their development slows and muscles used for movement weaken. Affected infants lose motor skills such as turning over, sitting, and crawling. They also develop an exaggerated startle reaction to loud noises. As the disease progresses, children with Sandhoff disease experience seizures, vision and hearing loss, and intellectual disability. An eye abnormality called a cherry-red spot, which can be identified with an eye examination, is characteristic of this disorder. Some affected children also have distinctive facial features, enlarged organs (organomegaly), or bone abnormalities. Children with the infantile form of Sandhoff disease usually live only into early childhood.<br /><br />The juvenile and adult forms of Sandhoff disease are very rare. Signs and symptoms are usually milder than those seen with the infantile form, although they vary widely. The juvenile form can begin between ages 2 and 10.  Characteristic features include speech difficulties, loss of cognitive function (dementia), seizures, and  loss of muscle coordination (ataxia). Adult Sandhoff disease is characterized by problems with movement and psychiatric problems.  <a target="_blank" href="https://medlineplus.gov/genetics/condition/sandhoff-disease">https://medlineplus.gov/genetics/condition/sandhoff-disease</a></div></div>
</div>
<div class="portlet mgSection" id="ID_102">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Clinical_features">Clinical features</h1><a sid="102" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln clinfeat"><strong>From HPO</strong><br />
<div class="divPopper rprt" id="clin_22579"><div><strong>Urinary incontinence</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>22579</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.">C0042024</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Loss of the ability to control the urinary bladder leading to involuntary urination.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/22579">Feature record</a> | <a href="/medgen?term=%22Urinary%20incontinence%22%5BClinical%20Features%5D%20OR%2022579%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_814352"><div><strong>Episodic abdominal pain</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>814352</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.">C3808022</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">An intermittent form of abdominal pain.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/814352">Feature record</a> | <a href="/medgen?term=%22Episodic%20abdominal%20pain%22%5BClinical%20Features%5D%20OR%20814352%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1863909"><div><strong>Increased urinary N-acetylglucosamine-rich oligosaccharide level</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1863909</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.">C5936977</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Presence of N-acetylglucosamine-rich oligosaccharides in the urine.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1863909">Feature record</a> | <a href="/medgen?term=%22Increased%20urinary%20N-acetylglucosamine-rich%20oligosaccharide%20level%22%5BClinical%20Features%5D%20OR%201863909%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1720680"><div><strong>Impotence</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1720680</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier assigned by MedGen (starting with CN) for terms&#10;that cannot be identified in NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">CN208474</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Inability to develop or maintain an erection of the penis.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1720680">Feature record</a> | <a href="/medgen?term=%22Impotence%22%5BClinical%20Features%5D%20OR%201720680%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_5459"><div><strong>Cardiomegaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>5459</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.">C0018800</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Increased size of the heart, clinically defined as an increased transverse diameter of the cardiac silhouette that is greater than or equal to 50% of the transverse diameter of the chest (increased cardiothoracic ratio) on a posterior-anterior projection of a chest radiograph or a computed tomography.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/5459">Feature record</a> | <a href="/medgen?term=%22Cardiomegaly%22%5BClinical%20Features%5D%20OR%205459%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_786046"><div><strong>Cherry red spot of the macula</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>786046</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.">C2216370</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Pallor of the perifoveal macula of the retina with appearance of a small circular reddish choroid shape as seen through the fovea centralis due to relative transparency of the macula.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/786046">Feature record</a> | <a href="/medgen?term=%22Cherry%20red%20spot%20of%20the%20macula%22%5BClinical%20Features%5D%20OR%20786046%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_42428"><div><strong>Hepatomegaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>42428</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.">C0019209</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Abnormally increased size of the liver.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/42428">Feature record</a> | <a href="/medgen?term=%22Hepatomegaly%22%5BClinical%20Features%5D%20OR%2042428%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_9225"><div><strong>Hepatosplenomegaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>9225</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.">C0019214</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">Simultaneous enlargement of the liver and spleen.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/9225">Feature record</a> | <a href="/medgen?term=%22Hepatosplenomegaly%22%5BClinical%20Features%5D%20OR%209225%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_96036"><div><strong>Chronic diarrhea</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>96036</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.">C0401151</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">The presence of chronic diarrhea, which is usually taken to mean diarrhea that has persisted for over 4 weeks.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/96036">Feature record</a> | <a href="/medgen?term=%22Chronic%20diarrhea%22%5BClinical%20Features%5D%20OR%2096036%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_849"><div><strong>Cerebellar ataxia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>849</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.">C0007758</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- or overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/849">Feature record</a> | <a href="/medgen?term=%22Cerebellar%20ataxia%22%5BClinical%20Features%5D%20OR%20849%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_8510"><div><strong>Dysarthria</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>8510</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.">C0013362</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Dysarthric speech is a general description referring to a neurological speech disorder characterized by poor articulation. Depending on the involved neurological structures, dysarthria may be further classified as spastic, flaccid, ataxic, hyperkinetic and hypokinetic, or mixed.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/8510">Feature record</a> | <a href="/medgen?term=%22Dysarthria%22%5BClinical%20Features%5D%20OR%208510%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_5124"><div><strong>Fasciculations</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>5124</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.">C0015644</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">Fasciculations are observed as small, local, involuntary muscle contractions (twitching) visible under the skin. Fasciculations result from increased irritability of an axon (which in turn is often a manifestation of disease of a motor neuron). This leads to sporadic discharges of all the muscle fibers controlled by the axon in isolation from other motor units.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/5124">Feature record</a> | <a href="/medgen?term=%22Fasciculations%22%5BClinical%20Features%5D%20OR%205124%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_43803"><div><strong>Orthostatic hypotension</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>43803</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.">C0020651</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A form of hypotension characterized by a sudden fall in blood pressure that occurs when a person assumes a standing position.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/43803">Feature record</a> | <a href="/medgen?term=%22Orthostatic%20hypotension%22%5BClinical%20Features%5D%20OR%2043803%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_7753"><div><strong>Spasticity</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>7753</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.">C0026838</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/7753">Feature record</a> | <a href="/medgen?term=%22Spasticity%22%5BClinical%20Features%5D%20OR%207753%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_57738"><div><strong>Hyperreflexia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>57738</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0151889</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Hyperreflexia is the presence of hyperactive stretch reflexes of the muscles.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/57738">Feature record</a> | <a href="/medgen?term=%22Hyperreflexia%22%5BClinical%20Features%5D%20OR%2057738%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_141670"><div><strong>Bilateral tonic-clonic seizure</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>141670</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.">C0494475</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">A bilateral tonic-clonic seizure is a seizure defined by a tonic (bilateral increased tone, lasting seconds to minutes) and then a clonic (bilateral sustained rhythmic jerking) phase.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/141670">Feature record</a> | <a href="/medgen?term=%22Bilateral%20tonic-clonic%20seizure%22%5BClinical%20Features%5D%20OR%20141670%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_329357"><div><strong>Exaggerated startle response</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>329357</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.">C1740801</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">An exaggerated startle reaction in response to a sudden unexpected visual or acoustic stimulus, or a quick movement near the face.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/329357">Feature record</a> | <a href="/medgen?term=%22Exaggerated%20startle%20response%22%5BClinical%20Features%5D%20OR%20329357%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_324613"><div><strong>Developmental regression</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>324613</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.">C1836830</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Loss of developmental skills, as manifested by loss of developmental milestones.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/324613">Feature record</a> | <a href="/medgen?term=%22Developmental%20regression%22%5BClinical%20Features%5D%20OR%20324613%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_333241"><div><strong>Upper motor neuron dysfunction</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>333241</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.">C1839042</a></dd><dt><span class="dotprefix"></span></dt><dd>Pathologic Function</dd></dl></div></div></div>
<div class="spaceAbove">A functional anomaly of the upper motor neuron. The upper motor neurons are neurons of the primary motor cortex which project to the brainstem and spinal chord via the corticonuclear, corticobulbar and corticospinal (pyramidal) tracts. They are involved in control of voluntary movements. Dysfunction leads to weakness, impairment of fine motor movements, spasticity, hyperreflexia and abnormal pyramidal signs.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/333241">Feature record</a> | <a href="/medgen?term=%22Upper%20motor%20neuron%20dysfunction%22%5BClinical%20Features%5D%20OR%20333241%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_383942"><div><strong>Progressive psychomotor deterioration</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>383942</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.">C1856565</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/383942">Feature record</a> | <a href="/medgen?term=%22Progressive%20psychomotor%20deterioration%22%5BClinical%20Features%5D%20OR%20383942%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_866867"><div><strong>Impaired temperature sensation</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>866867</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.">C4021222</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A reduced ability to discriminate between different temperatures.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/866867">Feature record</a> | <a href="/medgen?term=%22Impaired%20temperature%20sensation%22%5BClinical%20Features%5D%20OR%20866867%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_892446"><div><strong>CNS hypomyelination</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>892446</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.">C4025616</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Reduced amount of myelin in the central nervous system resulting from defective myelinogenesis.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/892446">Feature record</a> | <a href="/medgen?term=%22CNS%20hypomyelination%22%5BClinical%20Features%5D%20OR%20892446%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1385980"><div><strong>Myoclonic seizure</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1385980</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.">C4317123</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">A myoclonic seizure is a type of motor seizure characterized by sudden, brief (&lt;100 ms) involuntary single or multiple contraction of muscles or muscle groups of variable topography (axial, proximal limb, distal). Myoclonus is less regularly repetitive and less sustained than is clonus.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1385980">Feature record</a> | <a href="/medgen?term=%22Myoclonic%20seizure%22%5BClinical%20Features%5D%20OR%201385980%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_10133"><div><strong>Hypotonia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>10133</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0026827</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/10133">Feature record</a> | <a href="/medgen?term=%22Hypotonia%22%5BClinical%20Features%5D%20OR%2010133%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_57735"><div><strong>Muscle weakness</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>57735</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0151786</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Reduced strength of muscles.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/57735">Feature record</a> | <a href="/medgen?term=%22Muscle%20weakness%22%5BClinical%20Features%5D%20OR%2057735%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_892680"><div><strong>Muscular atrophy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>892680</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0541794</a></dd><dt><span class="dotprefix"></span></dt><dd>Pathologic Function</dd></dl></div></div></div>
<div class="spaceAbove">The presence of skeletal muscular atrophy (which is also known as amyotrophy).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/892680">Feature record</a> | <a href="/medgen?term=%22Muscular%20atrophy%22%5BClinical%20Features%5D%20OR%20892680%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_745757"><div><strong>Macrocephaly</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>745757</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.">C2243051</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Occipitofrontal (head) circumference greater than 97th centile compared to appropriate, age matched, sex-matched normal standards. Alternatively, a apparently increased size of the cranium.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/745757">Feature record</a> | <a href="/medgen?term=%22Macrocephaly%22%5BClinical%20Features%5D%20OR%20745757%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_870889"><div><strong>Abnormal glycosphingolipid metabolism</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>870889</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.">C4025350</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">An abnormality of glycosphingolipid metabolism.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/870889">Feature record</a> | <a href="/medgen?term=%22Abnormal%20glycosphingolipid%20metabolism%22%5BClinical%20Features%5D%20OR%20870889%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1800805"><div><strong>Reduced beta-hexosaminidase B activity</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1800805</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.">C5558366</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Diminished activity of the enzyme beta-hexosaminidase in the blood circulation.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1800805">Feature record</a> | <a href="/medgen?term=%22Reduced%20beta-hexosaminidase%20B%20activity%22%5BClinical%20Features%5D%20OR%201800805%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_44236"><div><strong>Macroglossia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>44236</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.">C0024421</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Increased length and width of the tongue.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/44236">Feature record</a> | <a href="/medgen?term=%22Macroglossia%22%5BClinical%20Features%5D%20OR%2044236%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_335284"><div><strong>Coarse facial features</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>335284</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.">C1845847</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Absence of fine and sharp appearance of brows, nose, lips, mouth, and chin, usually because of rounded and heavy features or thickened skin with or without thickening of subcutaneous and bony tissues.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/335284">Feature record</a> | <a href="/medgen?term=%22Coarse%20facial%20features%22%5BClinical%20Features%5D%20OR%20335284%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_5690"><div><strong>Hyperhidrosis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>5690</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.">C0020458</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Abnormal excessive perspiration (sweating) despite the lack of appropriate stimuli like hot and humid weather.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/5690">Feature record</a> | <a href="/medgen?term=%22Hyperhidrosis%22%5BClinical%20Features%5D%20OR%205690%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_43796"><div><strong>Hypohidrosis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>43796</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.">C0020620</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Abnormally diminished capacity to sweat.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/43796">Feature record</a> | <a href="/medgen?term=%22Hypohidrosis%22%5BClinical%20Features%5D%20OR%2043796%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_99138"><div><strong>Blindness</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>99138</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.">C0456909</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Blindness is the condition of lacking visual perception defined as a profound reduction in visual perception. On the 6m visual acuity scale, blindness is defined as less than 3/60. On the 20ft visual acuity scale, blindness is defined as less than 20/400. On the decimal visual acuity scale, blindness is defined as less than 0.05. Blindness is typically characterized by a visual field of no greater than 10 degrees in radius around central fixation.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/99138">Feature record</a> | <a href="/medgen?term=%22Blindness%22%5BClinical%20Features%5D%20OR%2099138%5Buid%5D">Search on this feature</a></div></div><div class="TreeLite" data-jigconfig="closed: 1"><div class="concept-def"><a class="small" href="#" onclick="jQuery(&quot;.TreeLite&quot;,&quot;#ID_102&quot;).TreeLite().openAll(); return false;">Show all</a><a class="small" href="#" onclick="jQuery(&quot;.TreeLite&quot;,&quot;#ID_102&quot;).TreeLite().closeAll(); return false;">Hide all</a></div><ul><li><span class="TLline">Abnormality of head or neck</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_335284" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Coarse facial features</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_44236" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Macroglossia</a></span></li></ul></li><li><span class="TLline">Abnormality of metabolism/homeostasis</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_870889" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Abnormal glycosphingolipid metabolism</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1800805" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Reduced beta-hexosaminidase B activity</a></span></li></ul></li><li><span class="TLline">Abnormality of the cardiovascular system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_5459" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Cardiomegaly</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_786046" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Cherry red spot of the macula</a></span></li></ul></li><li><span class="TLline">Abnormality of the digestive system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_96036" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Chronic diarrhea</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_42428" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hepatomegaly</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_9225" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hepatosplenomegaly</a></span></li></ul></li><li><span class="TLline">Abnormality of the eye</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_99138" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Blindness</a></span></li></ul></li><li><span class="TLline">Abnormality of the genitourinary system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1720680" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Impotence</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1863909" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Increased urinary N-acetylglucosamine-rich oligosaccharide level</a></span></li></ul></li><li><span class="TLline">Abnormality of the integument</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_5690" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hyperhidrosis</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_43796" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hypohidrosis</a></span></li></ul></li><li><span class="TLline">Abnormality of the musculoskeletal system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_10133" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hypotonia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_745757" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Macrocephaly</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_57735" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Muscle weakness</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_892680" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Muscular atrophy</a></span></li></ul></li><li><span class="TLline">Abnormality of the nervous system</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_141670" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Bilateral tonic-clonic seizure</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_849" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Cerebellar ataxia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_892446" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">CNS hypomyelination</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_324613" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Developmental regression</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_8510" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Dysarthria</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_329357" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Exaggerated startle response</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_5124" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Fasciculations</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_57738" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hyperreflexia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_866867" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Impaired temperature sensation</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1385980" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Myoclonic seizure</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_43803" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Orthostatic hypotension</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_383942" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Progressive psychomotor deterioration</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_7753" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spasticity</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_333241" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Upper motor neuron dysfunction</a></span></li></ul></li><li><span class="TLline">Constitutional symptom</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_814352" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Episodic abdominal pain</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_22579" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Urinary incontinence</a></span></li></ul></li></ul></div></div>
</div>
<div class="portlet mgSection" id="ID_118">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Term_Hierarchy">Term Hierarchy</h1><a sid="118" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln HierarchyGTR"><div class="jig-ncbitabs"><ul><li><a href="#tabGTR">GTR</a></li><li><a href="#tabMGEN">MeSH</a></li><li><a href="#tabORDO">Orphanet</a></li></ul><div id="tabGTR"><div class="search_result"><div class="rprts"><div class="chiclet_legend"><span class="chiclet_list" style="position:static;"><span title="Clinical test" class="chiclet Ccolor round">C</span><span>Clinical test,  </span><span title="Research test" class="chiclet Rcolor round">R</span><span>Research test,  </span><span title="OMIM" class="chiclet Ocolor ">O</span><span>OMIM,  </span><span title="GeneReview" class="chiclet Gcolor">G</span><span><em>GeneReviews</em>,  </span><span title="ClinVar" class="chiclet Vcolor">V</span><span>ClinVar  </span></span></div><div id="hierarchy" class="margin_t1"><div class="ds_tree"><ul><li class="matched_ds"><span class="chiclet_list"><span class="chiclet Ccolor round" title="Clinical test"><a target="_blank" href="/gtr/tests/?term=C0036161[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=11313">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=11313" target="_blank" href="/omim/268800">O</a></span><span class="chiclet Gcolor" title="GeneReviews"><a target="_blank" href="/books/NBK579484/" ref="ncbi_uid=11313">G</a></span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=11313" ref="ncbi_uid=11313">V</a></span></span><span class="TLline">Sandhoff disease</span></li></ul></div></div></div></div></div><div id="tabMGEN"><div class="ds_tree"><ul><li><span class="TLline"><a href="/medgen/1825994" ref="tree=MeSH" title="MedGen record for Cerebral lipidosis with dementia">Cerebral lipidosis with dementia</a></span><ul><li><span class="matched_ds">Sandhoff disease</span><ul><li><span class="TLline"><a href="/medgen/148319" ref="tree=MeSH" title="MedGen record for Sandhoff disease, adult form">Sandhoff disease, adult form</a></span></li><li><span class="TLline"><a href="/medgen/199669" ref="tree=MeSH" title="MedGen record for Sandhoff disease, infantile form">Sandhoff disease, infantile form</a></span></li><li><span class="TLline"><a href="/medgen/148320" ref="tree=MeSH" title="MedGen record for Sandhoff disease, juvenile form">Sandhoff disease, juvenile form</a></span></li></ul></li></ul></li></ul></div></div><div id="tabORDO">Follow <a target="_blank" href="http://www.orpha.net/consor/cgi-bin/Disease_Classif.php?lng=EN&amp;data_id=156&amp;PatId=38&amp;search=Disease_Classif_Simple&amp;new=1" class="ital bold">this link</a> to review classifications for <span class="ital">Sandhoff disease</span> in Orphanet.</div></div></div>
</div>
<div class="portlet mgSection" id="ID_105">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Professional_guidelines">Professional guidelines</h1><a sid="105" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><h3 class="subhead">PubMed<a class="help jig-ncbi-popper" data-jig="ncbipopper" href="#guidelinesHelpPM"><img class="pulldown" src="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/img/4204968" /></a></h3>
<div class="nl"><a target="_blank" href="/pubmed/39057926">Role of Botulinum Toxin in Treatment of Secondary Dystonia: A Case Series and Overview of Literature.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Mohanty D,
Riordan HRM,
Hedera P</span><br />
<span class="medgenPMjournal">Toxins (Basel)</span>
2024 Jun 24;16(7)
doi: 10.3390/toxins16070286.
<span class="bold">PMID: </span><a href="/pubmed/39057926" target="_blank">39057926</a><a href="/pmc/articles/PMC11281616" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/37209042">Efficacy and safety of miglustat in the treatment of GM2 gangliosidosis: A systematic review.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Mansouri V,
Tavasoli AR,
Khodarahmi M,
Dakkali MS,
Daneshfar S,
Ashrafi MR,
Heidari M,
Hosseinpour S,
Sharifianjazi F,
Bemanalizadeh M</span><br />
<span class="medgenPMjournal">Eur J Neurol</span>
2023 Sep;30(9):2919-2945.
Epub 2023 Jun 8
doi: 10.1111/ene.15871.
<span class="bold">PMID: </span><a href="/pubmed/37209042" target="_blank">37209042</a></div>
<div class="nl"><a target="_blank" href="/pubmed/34450229">The GM2 gangliosidoses: Unlocking the mysteries of pathogenesis and treatment.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Toro C,
Zainab M,
Tifft CJ</span><br />
<span class="medgenPMjournal">Neurosci Lett</span>
2021 Nov 1;764:136195.
Epub 2021 Aug 25
doi: 10.1016/j.neulet.2021.136195.
<span class="bold">PMID: </span><a href="/pubmed/34450229" target="_blank">34450229</a><a href="/pmc/articles/PMC8572160" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(%22sandhoff%20disease%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 (13)</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/36835039">Gene Therapy of Sphingolipid Metabolic Disorders.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Shaimardanova AA,
Solovyeva VV,
Issa SS,
Rizvanov AA</span><br />
<span class="medgenPMjournal">Int J Mol Sci</span>
2023 Feb 11;24(4)
doi: 10.3390/ijms24043627.
<span class="bold">PMID: </span><a href="/pubmed/36835039" target="_blank">36835039</a><a href="/pmc/articles/PMC9964151" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/32867370">GM2 Gangliosidoses: Clinical Features, Pathophysiological Aspects, and Current Therapies.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Leal AF,
Benincore-Flórez E,
Solano-Galarza D,
Garzón Jaramillo RG,
Echeverri-Peña OY,
Suarez DA,
Alméciga-Díaz CJ,
Espejo-Mojica AJ</span><br />
<span class="medgenPMjournal">Int J Mol Sci</span>
2020 Aug 27;21(17)
doi: 10.3390/ijms21176213.
<span class="bold">PMID: </span><a href="/pubmed/32867370" target="_blank">32867370</a><a href="/pmc/articles/PMC7503724" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/17998597">Substrate deprivation therapy: a new hope for patients suffering from neuronopathic forms of inherited lysosomal storage diseases.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Jakóbkiewicz-Banecka J,
Wegrzyn A,
Wegrzyn G</span><br />
<span class="medgenPMjournal">J Appl Genet</span>
2007;48(4):383-8.
doi: 10.1007/BF03195237.
<span class="bold">PMID: </span><a href="/pubmed/17998597" target="_blank">17998597</a></div>
<div class="nl"><a target="_blank" href="/pubmed/16918392">Molecular pathologies of and enzyme replacement therapies for lysosomal diseases.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Sakuraba H,
Sawada M,
Matsuzawa F,
Aikawa S,
Chiba Y,
Jigami Y,
Itoh K</span><br />
<span class="medgenPMjournal">CNS Neurol Disord Drug Targets</span>
2006 Aug;5(4):401-13.
doi: 10.2174/187152706777950738.
<span class="bold">PMID: </span><a href="/pubmed/16918392" target="_blank">16918392</a></div>
<div class="nl"><a target="_blank" href="/pubmed/7192191">Nomenclature of GM2-gangliosidoses.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Nørby S</span><br />
<span class="medgenPMjournal">Clin Genet</span>
1980 May;17(5):320-2.
doi: 10.1111/j.1399-0004.1980.tb00157.x.
<span class="bold">PMID: </span><a href="/pubmed/7192191" target="_blank">7192191</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Sandhoff%20disease%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 (79)</a></div><h3 class="subhead">Diagnosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/30061129">Extensive Mongolian spots and normocephaly: an uncommon presentation of infantile Sandhoff's disease.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Sharawat IK,
Saini L,
Randhawa MS,
Ahuja CK</span><br />
<span class="medgenPMjournal">BMJ Case Rep</span>
2018 Jul 30;2018
doi: 10.1136/bcr-2018-225013.
<span class="bold">PMID: </span><a href="/pubmed/30061129" target="_blank">30061129</a><a href="/pmc/articles/PMC6067147" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25120386">The man in the waiting room.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Maddy RE</span><br />
<span class="medgenPMjournal">Tex Heart Inst J</span>
2014 Aug;41(4):355-6.
Epub 2014 Aug 1
doi: 10.14503/THIJ-14-4312.
<span class="bold">PMID: </span><a href="/pubmed/25120386" target="_blank">25120386</a><a href="/pmc/articles/PMC4120496" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/1840098">The clinical aspects of adult hexosaminidase deficiencies.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Federico A,
Palmeri S,
Malandrini A,
Fabrizi G,
Mondelli M,
Guazzi GC</span><br />
<span class="medgenPMjournal">Dev Neurosci</span>
1991;13(4-5):280-7.
doi: 10.1159/000112174.
<span class="bold">PMID: </span><a href="/pubmed/1840098" target="_blank">1840098</a></div>
<div class="nl"><a target="_blank" href="/pubmed/7270152">Sandhoff disease.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Tatematsu M,
Imaida K,
Ito N,
Togari H,
Suzuki Y,
Ogiu T</span><br />
<span class="medgenPMjournal">Acta Pathol Jpn</span>
1981 May;31(3):503-12.
doi: 10.1111/j.1440-1827.1981.tb01391.x.
<span class="bold">PMID: </span><a href="/pubmed/7270152" target="_blank">7270152</a></div>
<div class="nl"><a target="_blank" href="/pubmed/6804413">Ganglioside storage diseases: an updated review.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">O'Brien JS</span><br />
<span class="medgenPMjournal">Ital J Neurol Sci</span>
1981 Aug;2(3):219-26.
doi: 10.1007/BF02335401.
<span class="bold">PMID: </span><a href="/pubmed/6804413" target="_blank">6804413</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Sandhoff%20disease%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 (158)</a></div><h3 class="subhead">Therapy</h3>
<div class="nl"><a target="_blank" href="/pubmed/34450229">The GM2 gangliosidoses: Unlocking the mysteries of pathogenesis and treatment.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Toro C,
Zainab M,
Tifft CJ</span><br />
<span class="medgenPMjournal">Neurosci Lett</span>
2021 Nov 1;764:136195.
Epub 2021 Aug 25
doi: 10.1016/j.neulet.2021.136195.
<span class="bold">PMID: </span><a href="/pubmed/34450229" target="_blank">34450229</a><a href="/pmc/articles/PMC8572160" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/32867370">GM2 Gangliosidoses: Clinical Features, Pathophysiological Aspects, and Current Therapies.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Leal AF,
Benincore-Flórez E,
Solano-Galarza D,
Garzón Jaramillo RG,
Echeverri-Peña OY,
Suarez DA,
Alméciga-Díaz CJ,
Espejo-Mojica AJ</span><br />
<span class="medgenPMjournal">Int J Mol Sci</span>
2020 Aug 27;21(17)
doi: 10.3390/ijms21176213.
<span class="bold">PMID: </span><a href="/pubmed/32867370" target="_blank">32867370</a><a href="/pmc/articles/PMC7503724" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/28392398">PUGNAc treatment provokes globotetraosylceramide accumulation in human umbilical vein endothelial cells.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Okuda T</span><br />
<span class="medgenPMjournal">Biochem Biophys Res Commun</span>
2017 May 20;487(1):76-82.
Epub 2017 Apr 6
doi: 10.1016/j.bbrc.2017.04.019.
<span class="bold">PMID: </span><a href="/pubmed/28392398" target="_blank">28392398</a></div>
<div class="nl"><a target="_blank" href="/pubmed/16918392">Molecular pathologies of and enzyme replacement therapies for lysosomal diseases.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Sakuraba H,
Sawada M,
Matsuzawa F,
Aikawa S,
Chiba Y,
Jigami Y,
Itoh K</span><br />
<span class="medgenPMjournal">CNS Neurol Disord Drug Targets</span>
2006 Aug;5(4):401-13.
doi: 10.2174/187152706777950738.
<span class="bold">PMID: </span><a href="/pubmed/16918392" target="_blank">16918392</a></div>
<div class="nl"><a target="_blank" href="/pubmed/12366816">Glycosphingolipid lysosomal storage diseases: therapy and pathogenesis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Jeyakumar M,
Butters TD,
Dwek RA,
Platt FM</span><br />
<span class="medgenPMjournal">Neuropathol Appl Neurobiol</span>
2002 Oct;28(5):343-57.
doi: 10.1046/j.1365-2990.2002.00422.x.
<span class="bold">PMID: </span><a href="/pubmed/12366816" target="_blank">12366816</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Sandhoff%20disease%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 (50)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/29618308">Genetics and Therapies for GM2 Gangliosidosis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Cachon-Gonzalez MB,
Zaccariotto E,
Cox TM</span><br />
<span class="medgenPMjournal">Curr Gene Ther</span>
2018;18(2):68-89.
doi: 10.2174/1566523218666180404162622.
<span class="bold">PMID: </span><a href="/pubmed/29618308" target="_blank">29618308</a><a href="/pmc/articles/PMC6040173" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/28647713">Microcephaly in infantile Sandhoff's disease.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Maulik K,
Kumar S,
Singh P,
Saini AG</span><br />
<span class="medgenPMjournal">BMJ Case Rep</span>
2017 Jun 24;2017
doi: 10.1136/bcr-2017-220912.
<span class="bold">PMID: </span><a href="/pubmed/28647713" target="_blank">28647713</a><a href="/pmc/articles/PMC5535109" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/24134161">Diffuse dermal melanocytosis in two patients with Sandhoff disease and mucopolysaccharidosis VI.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ashrafi MR,
Tavasoli A,
Shiva S,
Parvaneh N,
Tamizifar B</span><br />
<span class="medgenPMjournal">Int J Dermatol</span>
2014 Jun;53(6):736-8.
Epub 2013 Oct 18
doi: 10.1111/ijd.12303.
<span class="bold">PMID: </span><a href="/pubmed/24134161" target="_blank">24134161</a></div>
<div class="nl"><a target="_blank" href="/pubmed/12366816">Glycosphingolipid lysosomal storage diseases: therapy and pathogenesis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Jeyakumar M,
Butters TD,
Dwek RA,
Platt FM</span><br />
<span class="medgenPMjournal">Neuropathol Appl Neurobiol</span>
2002 Oct;28(5):343-57.
doi: 10.1046/j.1365-2990.2002.00422.x.
<span class="bold">PMID: </span><a href="/pubmed/12366816" target="_blank">12366816</a></div>
<div class="nl"><a target="_blank" href="/pubmed/10821697">Role of beta Arg211 in the active site of human beta-hexosaminidase B.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hou Y,
Vocadlo D,
Withers S,
Mahuran D</span><br />
<span class="medgenPMjournal">Biochemistry</span>
2000 May 23;39(20):6219-27.
doi: 10.1021/bi992464j.
<span class="bold">PMID: </span><a href="/pubmed/10821697" target="_blank">10821697</a><a href="/pmc/articles/PMC2910084" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Sandhoff%20disease%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 (50)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/38870773">Clinical outcome assessments of disease burden and progression in late-onset GM2 gangliosidoses.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kissell J,
Rochmann C,
Minini P,
Eichler F,
Stephen CD,
Lau H,
Toro C,
Johnston JM,
Krupnick R,
Hamed A,
Cox GF</span><br />
<span class="medgenPMjournal">Mol Genet Metab</span>
2024 Jul;142(3):108512.
Epub 2024 Jun 6
doi: 10.1016/j.ymgme.2024.108512.
<span class="bold">PMID: </span><a href="/pubmed/38870773" target="_blank">38870773</a><a href="/pmc/articles/PMC11317923" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/38165373">Clinical, Imaging, Genetic, and Disease Course Characteristics in Patients With GM2 Gangliosidosis: Beyond Age of Onset.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Kern J,
Böhringer J,
Timmann D,
Trollmann R,
Stendel C,
Kamm C,
Röbl M,
Santhanakumaran V,
Groeschel S,
Beck-Wödl S,
Göricke S,
Krägeloh-Mann I,
Synofzik M</span><br />
<span class="medgenPMjournal">Neurology</span>
2024 Jan 9;102(1):e207898.
Epub 2023 Dec 12
doi: 10.1212/WNL.0000000000207898.
<span class="bold">PMID: </span><a href="/pubmed/38165373" target="_blank">38165373</a><a href="/pmc/articles/PMC10834127" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/37209042">Efficacy and safety of miglustat in the treatment of GM2 gangliosidosis: A systematic review.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Mansouri V,
Tavasoli AR,
Khodarahmi M,
Dakkali MS,
Daneshfar S,
Ashrafi MR,
Heidari M,
Hosseinpour S,
Sharifianjazi F,
Bemanalizadeh M</span><br />
<span class="medgenPMjournal">Eur J Neurol</span>
2023 Sep;30(9):2919-2945.
Epub 2023 Jun 8
doi: 10.1111/ene.15871.
<span class="bold">PMID: </span><a href="/pubmed/37209042" target="_blank">37209042</a></div>
<div class="nl"><a target="_blank" href="/pubmed/33407268">Infantile onset Sandhoff disease: clinical manifestation and a novel common mutation in Thai patients.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Tim-Aroon T,
Wichajarn K,
Katanyuwong K,
Tanpaiboon P,
Vatanavicharn N,
Sakpichaisakul K,
Kongkrapan A,
Eu-Ahsunthornwattana J,
Thongpradit S,
Moolsuwan K,
Satproedprai N,
Mahasirimongkol S,
Lerksuthirat T,
Suktitipat B,
Jinawath N,
Wattanasirichaigoon D</span><br />
<span class="medgenPMjournal">BMC Pediatr</span>
2021 Jan 7;21(1):22.
doi: 10.1186/s12887-020-02481-3.
<span class="bold">PMID: </span><a href="/pubmed/33407268" target="_blank">33407268</a><a href="/pmc/articles/PMC7789739" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/10821697">Role of beta Arg211 in the active site of human beta-hexosaminidase B.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hou Y,
Vocadlo D,
Withers S,
Mahuran D</span><br />
<span class="medgenPMjournal">Biochemistry</span>
2000 May 23;39(20):6219-27.
doi: 10.1021/bi992464j.
<span class="bold">PMID: </span><a href="/pubmed/10821697" target="_blank">10821697</a><a href="/pmc/articles/PMC2910084" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Sandhoff%20disease%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 (76)</a></div></div>
</div>
<div class="portlet mgSection" id="ID_104">
<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/37209042">Efficacy and safety of miglustat in the treatment of GM2 gangliosidosis: A systematic review.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Mansouri V,
Tavasoli AR,
Khodarahmi M,
Dakkali MS,
Daneshfar S,
Ashrafi MR,
Heidari M,
Hosseinpour S,
Sharifianjazi F,
Bemanalizadeh M</span><br />
<span class="medgenPMjournal">Eur J Neurol</span>
2023 Sep;30(9):2919-2945.
Epub 2023 Jun 8
doi: 10.1111/ene.15871.
<span class="bold">PMID: </span><a href="/pubmed/37209042" target="_blank">37209042</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30726573">Emerging links between pediatric lysosomal storage diseases and adult parkinsonism.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ysselstein D,
Shulman JM,
Krainc D</span><br />
<span class="medgenPMjournal">Mov Disord</span>
2019 May;34(5):614-624.
Epub 2019 Feb 6
doi: 10.1002/mds.27631.
<span class="bold">PMID: </span><a href="/pubmed/30726573" target="_blank">30726573</a><a href="/pmc/articles/PMC6520126" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Sandhoff%20disease%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 (2)</a></div></div>
</div>
</div></div></div></div></div></div></div>
<div id="messagearea_bottom">
</div>
<div class=" bottom">
</div>
</div>
</div>
<div class="supplemental col three_col last">
<h2 class="offscreen_noflow">Supplemental Content</h2>
<div>
<!-- MedGen supplemental column starts here -->
<div class="rightCol mgCol">
<div class="portlet mgSection" id="ID_113">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Table_of_contents">Table of contents</h1><a sid="113" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul id="my-toc"></ul></div>
</div>
<div class="portlet mgSection" id="ID_106">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Genetic_Testing_Registry">Genetic Testing Registry</h1><a sid="106" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul><li><a href="/gtr/tests?term=C0036161%5bDISCUI%5d&amp;filter=method%3A1%5F1" target="_blank">Analyte (6)</a></li>
<li><a href="/gtr/tests?term=C0036161%5bDISCUI%5d&amp;filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (48)</a></li>
<li><a href="/gtr/tests?term=C0036161%5bDISCUI%5d&amp;filter=method%3A1%5F2" target="_blank">Enzyme assay (11)</a></li>
<li><a href="/gtr/tests?term=C0036161%5bDISCUI%5d&amp;filter=method%3A2%5F18" target="_blank">Mutation scanning of select exons (2)</a></li>
<li><a href="/gtr/tests?term=C0036161%5bDISCUI%5d&amp;filter=method%3A2%5F9" target="_blank">Sequence analysis of select exons (9)</a></li>
<li><a href="/gtr/tests?term=C0036161%5bDISCUI%5d&amp;filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (66)</a></li>
<li><a href="/gtr/tests?term=C0036161%5bDISCUI%5d&amp;filter=method%3A2%5F19" target="_blank">Targeted variant analysis (17)</a></li>
<li><a href="/gtr/tests?term=C0036161%5bDISCUI%5d&amp;filter=method%3A2%5F20" target="_blank">Uniparental disomy study (UPD) (1)</a></li>
<li class="portletSeeAll portletSeeAllPad"><total><a href="/gtr/tests?term=C0036161%5bDISCUI%5d" target="_blank">See all (84)</a></total></li>
</ul></div>
</div>
<div class="portlet mgSection" id="ID_119">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Clinical_resources">Clinical resources</h1><a sid="119" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul><li><a href="https://www.omim.org/search?index=entry&amp;start=1&amp;limit=10&amp;sort=score%20desc&amp;field=number&amp;search=268800" target="_blank">OMIM</a></li><li><a href="http://www.orpha.net/consor/cgi-bin/OC_Exp.php?Expert=796" target="_blank">Orphanet</a></li><li><a href="https://clinicaltrials.gov/search?cond=Sandhoff%20disease" target="_blank">ClinicalTrials.gov</a></li></ul></div>
</div>
<div class="portlet mgSection" id="ID_121">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Practice_guidelines">Practice guidelines</h1><a sid="121" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul class="a_poppers"><li><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(%22sandhoff%20disease%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></ul></div>
</div>
<div class="portlet mgSection" id="ID_115">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Molecular_resources">Molecular resources</h1><a sid="115" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul><li><a href="http://www.omim.org/search?index=entry&amp;start=1&amp;limit=10&amp;sort=score%20desc&amp;field=number&amp;search=606873" target="_blank">OMIM</a></li><li><a href="/clinvar/?term=3074[geneid]" target="_blank">View HEXB variations in ClinVar</a></li><li><a href="/nuccore/223671907" target="_blank">RefSeqGene</a></li><li><a href="https://catalog.coriell.org/Search?q=268800" target="_blank">Coriell Institute for Medical Research</a></li></ul></div>
</div>
<div class="portlet mgSection" id="ID_116">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Consumer_resources">Consumer resources</h1><a sid="116" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><ul><li><a href="http://www.diseaseinfosearch.org/Sandhoff+disease/6408" target="_blank">Genetic Alliance</a></li><li><a href="https://www.malacards.org/card/sandhoff_disease" target="_blank">MalaCards</a></li><li><a href="https://vsearch.nlm.nih.gov/vivisimo/cgi-bin/query-meta?v:project=medlineplus&amp;query=Sandhoff%20disease" target="_blank">MedlinePlus</a></li><li><a href="https://medlineplus.gov/genetics/condition/sandhoff-disease" target="_blank">MedlinePlusGenetics (GHR)</a></li><li><a href="https://rarediseases.info.nih.gov/diseases/2521/disease" target="_blank">NCATS Office of Rare Diseases Research (GARD)</a></li></ul></div>
</div>
</div>
<div class="portlet brieflink">
<div class="portlet_head">
<div class="portlet_title">
<h3>Reviews</h3>
</div>
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews.Shutter" sid="1" href="#" class="portlet_shutter" title="Show/hide content" remembercollapsed="true" pgsec_name="Reviews" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenReviews.Shutter"></a>
</div>
<div class="portlet_content">
<ul>
<li>
<a href="/pubmed/35420740" ref="ncbi_uid=&amp;discoId=gtr_reviews&amp;linkpos=1&amp;linkpostotal=3" target="_blank"><span class="gene_reviews">GeneReviews</span></a>
</li>
<li>
<a href="/pubmed/clinical?term=Sandhoff%20disease" ref="ncbi_uid=&amp;discoId=gtr_reviews&amp;linkpos=2&amp;linkpostotal=3" target="_blank">PubMed Clinical Queries</a>
</li>
<li>
<a href="/pubmed?term=Sandhoff%20disease%20AND%20humans[mesh]%20AND%20review[publication%20type]" ref="ncbi_uid=&amp;discoId=gtr_reviews&amp;linkpos=3&amp;linkpostotal=3" target="_blank">Reviews in PubMed</a>
</li>
</ul>
</div>
</div>
<!-- MedGen supplemental column ends here -->
<div class="portlet brieflink">
<div class="portlet_head">
<div class="portlet_title">
<h3>Related information</h3>
</div>
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenDiscoveryDbLinks.Shutter" sid="1" href="#" class="portlet_shutter" title="Show/hide content" remembercollapsed="true" pgsec_name="discovery_db_links" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_SingleItemSuplCluster.MedGenDiscoveryDbLinks.Shutter"></a>
</div>
<div class="portlet_content DiscoveryDbLinks">
<ul>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=11313" ref="log$=recordlinks">ClinVar</a>
<div class="brieflinkpop offscreen_noflow">Related medical variations</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=11313" ref="log$=recordlinks">Gene</a>
<div class="brieflinkpop offscreen_noflow">Related information in NCBI Gene</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/gtr/tests?term=C0036161[DISCUI]" ref="log$=recordlinks">GTR</a>
<div class="brieflinkpop offscreen_noflow">Related information in GTR</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/gtr/tests?term=C0036161[DISCUI]&amp;test_type=Clinical" ref="log$=recordlinks">GTR(Clinical)</a>
<div class="brieflinkpop offscreen_noflow">Clinical tests in GTR</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/mesh?LinkName=medgen_mesh&amp;from_uid=11313" ref="log$=recordlinks">MeSH</a>
<div class="brieflinkpop offscreen_noflow">Related Medical Subject Headings</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/omim?LinkName=medgen_omim&amp;from_uid=11313" ref="log$=recordlinks">OMIM</a>
<div class="brieflinkpop offscreen_noflow">Related records in OMIM</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/omim?LinkName=medgen_omim_gene&amp;from_uid=11313" ref="log$=recordlinks">OMIM(Genes)</a>
<div class="brieflinkpop offscreen_noflow">OMIM records containing genes associated with phenotypes registered in MedGen</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/pmc?LinkName=medgen_pmc&amp;from_uid=11313" ref="log$=recordlinks">PMC Articles</a>
<div class="brieflinkpop offscreen_noflow">Related information in PubMed Central Links</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/pubmed?LinkName=medgen_pubmed&amp;from_uid=11313" ref="log$=recordlinks">PubMed</a>
<div class="brieflinkpop offscreen_noflow">Related literature resources in PubMed</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/pubmed?LinkName=medgen_pubmed_bookshelf_cited&amp;from_uid=11313" ref="log$=recordlinks">PubMed (Bookshelf cited)</a>
<div class="brieflinkpop offscreen_noflow">Links to PubMed based on citations in GeneReviews and Medical Genetics Summaries</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=11313" ref="log$=recordlinks">PubMed (GeneReviews)</a>
<div class="brieflinkpop offscreen_noflow">GeneReviews in PubMed</div>
</li>
<li class="brieflinkpopper">
<a class="brieflinkpopperctrl" href="/pubmed?LinkName=medgen_pubmed_omim&amp;from_uid=11313" ref="log$=recordlinks">PubMed (OMIM)</a>
<div class="brieflinkpop offscreen_noflow">Related literature resources in PubMed</div>
</li>
</ul>
</div>
</div>
<div class="portlet">
<div class="portlet_head">
<div class="portlet_title">
<h3>Recent activity</h3>
</div>
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.Shutter" sid="1" href="#" class="portlet_shutter" title="Show/hide content" remembercollapsed="true" pgsec_name="recent_activity" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.Shutter"></a>
</div>
<div class="portlet_content">
<div id="HTDisplay" class="">
<input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.Cmd" sid="1" type="hidden" />
<div class="action">
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.ClearHistory" sid="1" realname="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.ClearHistory" cmd="ClearHT" href="?cmd=ClearHT&amp;" onclick="return false;" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.ClearHistory">
Clear
</a>
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryToggle" sid="1" realname="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryToggle" class="HTOn" cmd="HTOff" href="?cmd=HTOff&amp;" onclick="return false;" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryToggle">
Turn Off
</a>
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryToggle" sid="2" realname="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryToggle" class="HTOff" cmd="HTOn" href="?cmd=HTOn&amp;" onclick="return false;" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryToggle">
Turn On
</a>
</div>
<ul id="activity">
<li class="ra_rcd ralinkpopper two_line">
<a class="htb ralinkpopperctrl" ref="log$=activity&amp;linkpos=1" href="/portal/utils/pageresolver.fcgi?recordid=67ca7bcd84f3725e59b1896c">Sandhoff disease</a>
<div class="ralinkpop offscreen_noflow">Sandhoff disease<div class="brieflinkpopdesc"></div></div>
<div class="tertiary">MedGen</div>
</li>
<li class="ra_qry two_line">
<a class="htb" ref="log$=activity&amp;linkpos=2" href="/portal/utils/pageresolver.fcgi?recordid=67ca7bcca68b6b5afce8dd3c">C0036161[conceptid] <span class="number">(1)</span></a>
<div class="tertiary">MedGen</div>
</li>
<li class="ra_qry ralinkpopper two_line">
<a class="htb ralinkpopperctrl" ref="log$=activity&amp;linkpos=3" href="/portal/utils/pageresolver.fcgi?recordid=67ca7bcba68b6b5afce8dbb6">C1096903[trait identifier] AND "Labcorp Genetics (formerly Invita... <span class="number">(464)</span></a>
<div class="ralinkpop offscreen_noflow">C1096903[trait identifier] AND "Labcorp Genetics (formerly Invitae), Labcorp"[submitter]<div class="brieflinkpopdesc">Search</div></div>
<div class="tertiary">ClinVar</div>
</li>
<li class="ra_rcd ralinkpopper two_line">
<a class="htb ralinkpopperctrl" ref="log$=activity&amp;linkpos=4" href="/portal/utils/pageresolver.fcgi?recordid=67ca7bcaf4a390645ec005d4">Salla disease</a>
<div class="ralinkpop offscreen_noflow">Salla disease<div class="brieflinkpopdesc"></div></div>
<div class="tertiary">MedGen</div>
</li>
<li class="ra_qry two_line">
<a class="htb" ref="log$=activity&amp;linkpos=5" href="/portal/utils/pageresolver.fcgi?recordid=67ca7bc9f4a390645ebffaf9">C1096903[conceptid] <span class="number">(1)</span></a>
<div class="tertiary">MedGen</div>
</li>
</ul>
<p class="HTOn">Your browsing activity is empty.</p>
<p class="HTOff">Activity recording is turned off.</p>
<p id="turnOn" class="HTOff">
<a name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryOn" sid="1" realname="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryOn" cmd="HTOn" href="?cmd=HTOn&amp;" onclick="return false;" id="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.HistoryDisplay.HistoryOn">Turn recording back on</a>
</p>
<a class="seemore" href="/sites/myncbi/recentactivity">See more...</a>
</div>
</div>
</div>
</div>
</div>
<div id="NCBIFooter_dynamic">
<!--<component id="NCBIBreadcrumbs"/>
<component id="NCBIHelpDesk"/>-->
<noscript><img alt="" src="/stat?jsdisabled=true&amp;ncbi_app=entrez&amp;ncbi_db=medgen&amp;ncbi_pdid=FullReport&amp;ncbi_phid=CE8D91957CA727210000000000A90092" /></noscript>
</div>
<div xmlns="http://www.w3.org/1999/xhtml" class="footer" id="footer" xml:base="http://127.0.0.1/sites/static/header_footer/">
<section class="icon-section">
<div id="icon-section-header" class="icon-section_header">Follow NCBI</div>
<div class="grid-container container">
<div class="icon-section_container">
<a class="footer-icon" id="footer_twitter" href="https://twitter.com/ncbi" aria-label="Twitter">
<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40" fill="none">
<title>Twitter</title>
<g id="twitterx1008">
<path id="path1008" d="M6.06736 7L16.8778 20.8991L6.00001 32.2H10.2L18.6 23.1L25.668 32.2H34L22.8 17.5L31.9 7H28.4L20.7 15.4L14.401 7H6.06898H6.06736ZM9.66753 8.73423H12.9327L29.7327 30.4658H26.5697L9.66753 8.73423Z" fill="#5B616B"></path>
</g>
</svg>
</a>
<a class="footer-icon" id="footer_facebook" href="https://www.facebook.com/ncbi.nlm" aria-label="Facebook"><svg xmlns="http://www.w3.org/2000/svg" data-name="Layer 1" viewBox="0 0 300 300">
<title>Facebook</title>
<path class="cls-11" d="M210.5,115.12H171.74V97.82c0-8.14,5.39-10,9.19-10h27.14V52l-39.32-.12c-35.66,0-42.42,26.68-42.42,43.77v19.48H99.09v36.32h27.24v109h45.41v-109h35Z">
</path>
</svg></a>
<a class="footer-icon" id="footer_linkedin" href="https://www.linkedin.com/company/ncbinlm" aria-label="LinkedIn"><svg xmlns="http://www.w3.org/2000/svg" data-name="Layer 1" viewBox="0 0 300 300">
<title>LinkedIn</title>
<path class="cls-11" d="M101.64,243.37H57.79v-114h43.85Zm-22-131.54h-.26c-13.25,0-21.82-10.36-21.82-21.76,0-11.65,8.84-21.15,22.33-21.15S101.7,78.72,102,90.38C102,101.77,93.4,111.83,79.63,111.83Zm100.93,52.61A17.54,17.54,0,0,0,163,182v61.39H119.18s.51-105.23,0-114H163v13a54.33,54.33,0,0,1,34.54-12.66c26,0,44.39,18.8,44.39,55.29v58.35H198.1V182A17.54,17.54,0,0,0,180.56,164.44Z">
</path>
</svg></a>
<a class="footer-icon" id="footer_github" href="https://github.com/ncbi" aria-label="GitHub"><svg xmlns="http://www.w3.org/2000/svg" data-name="Layer 1" viewBox="0 0 300 300">
<defs>
<style>
.cls-11,
.cls-12 {
fill: #737373;
}
.cls-11 {
fill-rule: evenodd;
}
</style>
</defs>
<title>GitHub</title>
<path class="cls-11" d="M151.36,47.28a105.76,105.76,0,0,0-33.43,206.1c5.28,1,7.22-2.3,7.22-5.09,0-2.52-.09-10.85-.14-19.69-29.42,6.4-35.63-12.48-35.63-12.48-4.81-12.22-11.74-15.47-11.74-15.47-9.59-6.56.73-6.43.73-6.43,10.61.75,16.21,10.9,16.21,10.9,9.43,16.17,24.73,11.49,30.77,8.79,1-6.83,3.69-11.5,6.71-14.14C108.57,197.1,83.88,188,83.88,147.51a40.92,40.92,0,0,1,10.9-28.39c-1.1-2.66-4.72-13.42,1-28,0,0,8.88-2.84,29.09,10.84a100.26,100.26,0,0,1,53,0C198,88.3,206.9,91.14,206.9,91.14c5.76,14.56,2.14,25.32,1,28a40.87,40.87,0,0,1,10.89,28.39c0,40.62-24.74,49.56-48.29,52.18,3.79,3.28,7.17,9.71,7.17,19.58,0,14.15-.12,25.54-.12,29,0,2.82,1.9,6.11,7.26,5.07A105.76,105.76,0,0,0,151.36,47.28Z">
</path>
<path class="cls-12" d="M85.66,199.12c-.23.52-1.06.68-1.81.32s-1.2-1.06-.95-1.59,1.06-.69,1.82-.33,1.21,1.07.94,1.6Zm-1.3-1">
</path>
<path class="cls-12" d="M90,203.89c-.51.47-1.49.25-2.16-.49a1.61,1.61,0,0,1-.31-2.19c.52-.47,1.47-.25,2.17.49s.82,1.72.3,2.19Zm-1-1.08">
</path>
<path class="cls-12" d="M94.12,210c-.65.46-1.71,0-2.37-.91s-.64-2.07,0-2.52,1.7,0,2.36.89.65,2.08,0,2.54Zm0,0"></path>
<path class="cls-12" d="M99.83,215.87c-.58.64-1.82.47-2.72-.41s-1.18-2.06-.6-2.7,1.83-.46,2.74.41,1.2,2.07.58,2.7Zm0,0">
</path>
<path class="cls-12" d="M107.71,219.29c-.26.82-1.45,1.2-2.64.85s-2-1.34-1.74-2.17,1.44-1.23,2.65-.85,2,1.32,1.73,2.17Zm0,0">
</path>
<path class="cls-12" d="M116.36,219.92c0,.87-1,1.59-2.24,1.61s-2.29-.68-2.3-1.54,1-1.59,2.26-1.61,2.28.67,2.28,1.54Zm0,0">
</path>
<path class="cls-12" d="M124.42,218.55c.15.85-.73,1.72-2,1.95s-2.37-.3-2.52-1.14.73-1.75,2-2,2.37.29,2.53,1.16Zm0,0"></path>
</svg></a>
<a class="footer-icon" id="footer_blog" href="https://ncbiinsights.ncbi.nlm.nih.gov/" aria-label="Blog">
<svg xmlns="http://www.w3.org/2000/svg" id="Layer_1" data-name="Layer 1" viewBox="0 0 40 40">
<defs><style>.cls-1{fill:#737373;}</style></defs>
<title>NCBI Insights Blog</title>
<path class="cls-1" d="M14,30a4,4,0,1,1-4-4,4,4,0,0,1,4,4Zm11,3A19,19,0,0,0,7.05,15a1,1,0,0,0-1,1v3a1,1,0,0,0,.93,1A14,14,0,0,1,20,33.07,1,1,0,0,0,21,34h3a1,1,0,0,0,1-1Zm9,0A28,28,0,0,0,7,6,1,1,0,0,0,6,7v3a1,1,0,0,0,1,1A23,23,0,0,1,29,33a1,1,0,0,0,1,1h3A1,1,0,0,0,34,33Z"></path>
</svg>
</a>
</div>
</div>
</section>
<section class="container-fluid bg-primary">
<div class="container pt-5">
<div class="row mt-3">
<div class="col-lg-3 col-12">
<p><a class="text-white" href="https://www.nlm.nih.gov/socialmedia/index.html">Connect with NLM</a></p>
<ul class="list-inline social_media">
<li class="list-inline-item"><a href="https://twitter.com/NLM_NIH" aria-label="Twitter" target="_blank" rel="noopener noreferrer">
<svg xmlns="http://www.w3.org/2000/svg" width="35" height="35" viewBox="0 0 36 35" fill="none">
<title>Twitter</title>
<g id="twitterx1009" clip-path="url(#clip0_65276_3946)">
<path id="Vector_Twitter" d="M17.5006 34.6565C26.9761 34.6565 34.6575 26.9751 34.6575 17.4996C34.6575 8.02416 26.9761 0.342773 17.5006 0.342773C8.02514 0.342773 0.34375 8.02416 0.34375 17.4996C0.34375 26.9751 8.02514 34.6565 17.5006 34.6565Z" fill="#205493" stroke="white" stroke-width="1.0" stroke-miterlimit="10"></path>
<path id="path1009" d="M8.54811 8.5L16.2698 18.4279L8.50001 26.5H11.5L17.5 20L22.5486 26.5H28.5L20.5 16L27 8.5H24.5L19 14.5L14.5007 8.5H8.54927H8.54811ZM11.1197 9.73873H13.4519L25.4519 25.2613H23.1926L11.1197 9.73873Z" fill="white"></path>
</g>
<defs>
<clipPath id="clip0_65276_3946">
<rect width="35" height="35" fill="white"></rect>
</clipPath>
</defs>
</svg>
</a></li>
<li class="list-inline-item"><a href="https://www.facebook.com/nationallibraryofmedicine" aria-label="Facebook" rel="noopener noreferrer" target="_blank">
<svg xmlns="http://www.w3.org/2000/svg" width="35" height="35" viewBox="0 0 36 35" fill="none">
<title>Facebook</title>
<g id="Facebook" clip-path="url(#clip0_1717_1086)">
<path id="Vector_Facebook" d="M15.1147 29.1371C15.1147 29.0822 15.1147 29.0296 15.1147 28.9747V18.9414H11.8183C11.6719 18.9414 11.6719 18.9414 11.6719 18.8018C11.6719 17.5642 11.6719 16.3289 11.6719 15.0937C11.6719 14.9793 11.7062 14.9518 11.816 14.9518C12.8683 14.9518 13.9206 14.9518 14.9751 14.9518H15.1215V14.8329C15.1215 13.8057 15.1215 12.774 15.1215 11.7492C15.1274 10.9262 15.3148 10.1146 15.6706 9.37241C16.1301 8.38271 16.9475 7.60378 17.9582 7.19235C18.6492 6.90525 19.3923 6.76428 20.1405 6.7783C21.0029 6.79202 21.8653 6.83091 22.7278 6.86065C22.8879 6.86065 23.048 6.89496 23.2082 6.90182C23.2974 6.90182 23.3271 6.94071 23.3271 7.02993C23.3271 7.54235 23.3271 8.05477 23.3271 8.5649C23.3271 9.16882 23.3271 9.77274 23.3271 10.3767C23.3271 10.4819 23.2974 10.5139 23.1921 10.5116C22.5379 10.5116 21.8814 10.5116 21.2271 10.5116C20.9287 10.5184 20.6316 10.5528 20.3395 10.6146C20.0822 10.6619 19.8463 10.7891 19.6653 10.9779C19.4842 11.1668 19.3672 11.4078 19.3307 11.6669C19.2857 11.893 19.2612 12.1226 19.2575 12.3531C19.2575 13.1904 19.2575 14.0299 19.2575 14.8695C19.2575 14.8946 19.2575 14.9198 19.2575 14.9564H23.0229C23.1807 14.9564 23.183 14.9564 23.1624 15.1074C23.0778 15.7662 22.9885 16.425 22.9039 17.0816C22.8322 17.6321 22.7636 18.1827 22.698 18.7332C22.6729 18.9437 22.6797 18.9437 22.4693 18.9437H19.2644V28.8992C19.2644 28.9793 19.2644 29.0593 19.2644 29.1394L15.1147 29.1371Z" fill="white"></path>
<path id="Vector_2_Facebook" d="M17.5006 34.657C26.9761 34.657 34.6575 26.9756 34.6575 17.5001C34.6575 8.02465 26.9761 0.343262 17.5006 0.343262C8.02514 0.343262 0.34375 8.02465 0.34375 17.5001C0.34375 26.9756 8.02514 34.657 17.5006 34.657Z" stroke="white" stroke-width="1.0" stroke-miterlimit="10"></path>
</g>
<defs>
<clipPath id="clip0_1717_1086">
<rect width="35" height="35" fill="white"></rect>
</clipPath>
</defs>
</svg>
</a></li>
<li class="list-inline-item"><a href="https://www.youtube.com/user/NLMNIH" aria-label="Youtube" target="_blank" rel="noopener noreferrer">
<svg xmlns="http://www.w3.org/2000/svg" width="35" height="35" viewBox="0 0 36 35" fill="none">
<title>Youtube</title>
<g id="YouTube" clip-path="url(#clip0_1717_1101)">
<path id="Vector_Youtube" d="M26.2571 11.4791C25.9025 11.1589 25.5709 10.9576 24.228 10.834C22.5512 10.6785 20.2797 10.6556 18.564 10.6533H16.4365C14.7208 10.6533 12.4493 10.6785 10.7725 10.834C9.43196 10.9576 9.09798 11.1589 8.7434 11.4791C7.81464 12.321 7.6202 14.6268 7.59961 16.8938C7.59961 17.3178 7.59961 17.741 7.59961 18.1635C7.62706 20.4121 7.82837 22.686 8.7434 23.521C9.09798 23.8412 9.42967 24.0425 10.7725 24.1661C12.4493 24.3216 14.7208 24.3445 16.4365 24.3468H18.564C20.2797 24.3468 22.5512 24.3216 24.228 24.1661C25.5686 24.0425 25.9025 23.8412 26.2571 23.521C27.1722 22.6929 27.3735 20.451 27.4009 18.2206C27.4009 17.7402 27.4009 17.2599 27.4009 16.7795C27.3735 14.5491 27.1699 12.3072 26.2571 11.4791ZM15.5604 20.5311V14.652L20.561 17.5001L15.5604 20.5311Z" fill="white"></path>
<path id="Vector_2_Youtube" d="M17.5006 34.657C26.9761 34.657 34.6575 26.9756 34.6575 17.5001C34.6575 8.02465 26.9761 0.343262 17.5006 0.343262C8.02514 0.343262 0.34375 8.02465 0.34375 17.5001C0.34375 26.9756 8.02514 34.657 17.5006 34.657Z" stroke="white" stroke-width="1.0" stroke-miterlimit="10"></path>
</g>
<defs>
<clipPath id="clip0_1717_1101">
<rect width="35" height="35" fill="white"></rect>
</clipPath>
</defs>
</svg>
</a></li>
</ul>
</div>
<div class="col-lg-3 col-12">
<p class="address_footer text-white">National Library of Medicine<br />
<a href="https://www.google.com/maps/place/8600+Rockville+Pike,+Bethesda,+MD+20894/@38.9959508,-77.101021,17z/data=!3m1!4b1!4m5!3m4!1s0x89b7c95e25765ddb:0x19156f88b27635b8!8m2!3d38.9959508!4d-77.0988323" class="text-white" target="_blank" rel="noopener noreferrer">8600 Rockville Pike<br />
Bethesda, MD 20894</a></p>
</div>
<div class="col-lg-3 col-12 centered-lg">
<p><a href="https://www.nlm.nih.gov/web_policies.html" class="text-white">Web Policies</a><br />
<a href="https://www.nih.gov/institutes-nih/nih-office-director/office-communications-public-liaison/freedom-information-act-office" class="text-white">FOIA</a><br />
<a href="https://www.hhs.gov/vulnerability-disclosure-policy/index.html" class="text-white" id="vdp">HHS Vulnerability Disclosure</a></p>
</div>
<div class="col-lg-3 col-12 centered-lg">
<p><a class="supportLink text-white" href="https://support.nlm.nih.gov/">Help</a><br />
<a href="https://www.nlm.nih.gov/accessibility.html" class="text-white">Accessibility</a><br />
<a href="https://www.nlm.nih.gov/careers/careers.html" class="text-white">Careers</a></p>
</div>
</div>
<div class="row">
<div class="col-lg-12 centered-lg">
<nav class="bottom-links">
<ul class="mt-3">
<li>
<a class="text-white" href="//www.nlm.nih.gov/">NLM</a>
</li>
<li>
<a class="text-white" href="https://www.nih.gov/">NIH</a>
</li>
<li>
<a class="text-white" href="https://www.hhs.gov/">HHS</a>
</li>
<li>
<a class="text-white" href="https://www.usa.gov/">USA.gov</a>
</li>
</ul>
</nav>
</div>
</div>
</div>
</section>
<script type="text/javascript" src="/portal/portal3rc.fcgi/rlib/js/InstrumentOmnitureBaseJS/InstrumentNCBIConfigJS/InstrumentNCBIBaseJS/InstrumentPageStarterJS.js?v=1"> </script>
<script type="text/javascript" src="/portal/portal3rc.fcgi/static/js/hfjs2.js"> </script>
</div>
</div>
<div><input name="EntrezSystem2.PEntrez.DbConnector.Db" sid="1" type="hidden" value="medgen" /><input name="EntrezSystem2.PEntrez.DbConnector.LastDb" sid="1" type="hidden" value="medgen" /><input name="EntrezSystem2.PEntrez.DbConnector.Term" sid="1" type="hidden" value="C0036161[conceptid]" /><input name="EntrezSystem2.PEntrez.DbConnector.LastTabCmd" sid="1" type="hidden" value="" /><input name="EntrezSystem2.PEntrez.DbConnector.LastQueryKey" sid="1" type="hidden" value="16538" /><input name="EntrezSystem2.PEntrez.DbConnector.IdsFromResult" sid="1" type="hidden" value="" /><input name="EntrezSystem2.PEntrez.DbConnector.LastIdsFromResult" sid="1" type="hidden" value="" /><input name="EntrezSystem2.PEntrez.DbConnector.LinkName" sid="1" type="hidden" /><input name="EntrezSystem2.PEntrez.DbConnector.LinkReadableName" sid="1" type="hidden" /><input name="EntrezSystem2.PEntrez.DbConnector.LinkSrcDb" sid="1" type="hidden" /><input name="EntrezSystem2.PEntrez.DbConnector.Cmd" sid="1" type="hidden" /><input name="EntrezSystem2.PEntrez.DbConnector.TabCmd" sid="1" type="hidden" /><input name="EntrezSystem2.PEntrez.DbConnector.QueryKey" sid="1" type="hidden" /></div>
<input type="hidden" name="p$a" id="p$a" /><input type="hidden" name="p$l" id="p$l" value="EntrezSystem2" /><input type="hidden" name="p$st" id="p$st" value="medgen" /><input name="SessionId" id="SessionId" value="CE8B5AF87C7FFCB1_0191SID" disabled="disabled" type="hidden" /><input name="Snapshot" id="Snapshot" value="/projects/Phenotype/MedGen/MedGen@6.14" disabled="disabled" type="hidden" /></form>
</div>
</div>
<!-- CE8B5AF87C7FFCB1_0191SID /projects/Phenotype/MedGen/MedGen@6.14 portal106 v4.1.r689238 Tue, Oct 22 2024 16:10:51 -->
<span id="portal-csrf-token" style="display:none" data-token="CE8B5AF87C7FFCB1_0191SID"></span>
<script type='text/javascript' src='/portal/js/portal.js'></script><script type="text/javascript" src="//static.pubmed.gov/portal/portal3rc.fcgi/4223267/js/4221766/3812534/4212053/3812535/3781605/4186313/2499590/3758627/4078478/3908752/3423/4018706/3891418/4212356/4078480/4078479/4025341/4076482/31971/35962/2733373/33966/3397055/4001808.js" snapshot="medgen"></script></body>
</html>