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<meta name="keywords" content="C0268540, disease or syndrome, hhh, hhh - hyperornithinemia-hyperammonemia-homocitrullinuria syndrome, hhh syndrome, hhhs, hyperornithinemia-hyperammonemia-homocitrullinemia syndrome, hyperornithinemia-hyperammonemia-homocitrullinuria, hyperornithinemia-hyperammonemia-homocitrullinuria (hhh) syndrome, hyperornithinemia-hyperammonemia-homocitrullinuria syndrome, ornithine carrier deficiency, ornithine translocase deficiency, ornithine translocase deficiency syndrome, ornt1 deficiency, slc25a15, slc25a15-gene related hyperornithinemia, hyperammonemia, homocitrullinuria syndrome, solute carrier family 25 member 15-gene related hyperornithinemia, hyperammonemia, homocitrullinuria syndrome, triple h syndrome, autosomal dominant, autosomal recessive, birth defects, chromosomal disease, chromosome, clinical features, clinical findings, clinical genetics, clinical recommendations, clinvar, congenital chromosomal disease, consumer genetic resources, cytogenetic location, disease characteristics, disease definitions, disease descriptions, disease ontology, disease synonyms, disease vocabulary, dysmorphology, entrez, familial disease, gene, gene-disease relationship, genereviews, genetic disease, genetic disorder, genetic terminology, genetic testing registry, genetics home reference, genomic disease, gtr, hereditary disease, heritable disease, hpo, human phenotype ontology, inherited disease, management guidelines, maternal inheritance, medgen, medical genetics, medical subject headings, mesh, mitochondrial inheritance, mode of inheritance, national center for biotechnology information, national institutes of health, national library of medicine, ncbi, nih, nlm, omim, ordo, orphanet, paternal inheritance, phenome, position statements, professional practice guidelines, rare disease, reference sequence, refseq, snomed ct, syndrome, undiagnosed diseases, x-linked recessive" /><meta name="description" content="Hyperornithinemia-hyperammonemia-homocitrullinuria (HHH) syndrome is a disorder of the urea cycle and ornithine degradation pathway. Clinical manifestations and age of onset vary among individuals even in the same family. Neonatal onset (~8% of affected individuals). Manifestations of hyperammonemia usually begin 24-48 hours after feeding begins and can include lethargy, somnolence, refusal to feed, vomiting, tachypnea with respiratory alkalosis, and/or seizures. Infantile, childhood, and adult onset (~92%). Affected individuals may present with: Chronic neurocognitive deficits (including developmental delay, ataxia, spasticity, learning disabilities, cognitive deficits, and/or unexplained seizures); Acute encephalopathy secondary to hyperammonemic crisis precipitated by a variety of factors; and Chronic liver dysfunction (unexplained elevation of liver transaminases with or without mild coagulopathy, with or without mild hyperammonemia and protein intolerance). Neurologic findings and cognitive abilities can continue to deteriorate despite early metabolic control that prevents hyperammonemia." /><meta name="robots" content="index,nofollow,noarchive" />
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<title>Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome (Concept Id: C0268540)
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<!--
UID=82815
ConceptID=C0268540
-->
<!--imgCountBooks = 1--><div class="ncbi_carousel" data-ncbicarousel-config="imageWidth:'100px',numItemsVisible:2,toggler:false"><div class="nc_header"><span class="img_strip_title">Image</span></div><div class="nc_content"><div class="nc_item"><a class="figpopup"><img alt="Image from GeneReviews" src="/books/NBK97260/bin/hhhs-Image001.gif" src-large="/books/NBK97260/bin/hhhs-Image001.jpg" /></a><br /><a href="/books/NBK97260/figure/hhhs.F1/" title="GeneReviews" target="_blank">details</a></div></div></div><h1 class="medgenTitle"><div class="MedGenTitleText">Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome<span class="h1sub">(HHHS)</span></div></h1><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>82815</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:">C0268540</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>HHH SYNDROME; HHHS; Ornithine translocase deficiency; Ornithine translocase deficiency syndrome</td></tr>
<tr><td><span class="bold">SNOMED CT: </span></td>
<td>HHH - Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome (30287008); Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome (30287008); SLC25A15-gene related hyperornithinemia, hyperammonemia, homocitrullinuria syndrome (30287008); Solute carrier family 25 member 15-gene related hyperornithinemia, hyperammonemia, homocitrullinuria syndrome (30287008)</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="SLC25A15 - ID: 10166 - NCBI Gene" href="/gene/10166" class="medgenPMinfo">SLC25A15</a> (13q14.11)</td></tr>
<tr><td colspan="2" class="small"> </td></tr><tr><td>Monarch Initiative:</td>
<td><a href="https://monarchinitiative.org/disease/MONDO:0009393" target="_blank">MONDO:0009393</a></td></tr>
<tr><td>OMIM<span class="superscript">®</span>:</td>
<td><a href="https://omim.org/entry/238970" target="_blank">238970</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=415">ORPHA415</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/NBK97260" target="_blank">Hyperornithinemia-Hyperammonemia-Homocitrullinuria Syndrome</a></div><div>Hyperornithinemia-hyperammonemia-homocitrullinuria (HHH) syndrome is a disorder of the urea cycle and ornithine degradation pathway. Clinical manifestations and age of onset vary among individuals even in the same family. Neonatal onset (~8% of affected individuals). Manifestations of hyperammonemia usually begin 24-48 hours after feeding begins and can include lethargy, somnolence, refusal to feed, vomiting, tachypnea with respiratory alkalosis, and/or seizures. Infantile, childhood, and adult onset (~92%). Affected individuals may present with: Chronic neurocognitive deficits (including developmental delay, ataxia, spasticity, learning disabilities, cognitive deficits, and/or unexplained seizures); Acute encephalopathy secondary to hyperammonemic crisis precipitated by a variety of factors; and Chronic liver dysfunction (unexplained elevation of liver transaminases with or without mild coagulopathy, with or without mild hyperammonemia and protein intolerance). Neurologic findings and cognitive abilities can continue to deteriorate despite early metabolic control that prevents hyperammonemia. [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/NBK97260#hhhs.Summary" target="NBK97260">Summary</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Diagnosis" target="NBK97260">Diagnosis</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Clinical_Characteristics" target="NBK97260">Clinical Characteristics</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Genetically_Related_Allelic_Disorde" target="NBK97260">Genetically Related (Allelic) Disorders</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Differential_Diagnosis" target="NBK97260">Differential Diagnosis</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Management" target="NBK97260">Management</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Genetic_Counseling" target="NBK97260">Genetic Counseling</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Resources" target="NBK97260">Resources</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Molecular_Genetics" target="NBK97260">Molecular Genetics</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.Chapter_Notes" target="NBK97260">Chapter Notes</a>  |  <a class="medgenPMinfo" href="/books/NBK97260#hhhs.References" target="NBK97260">References</a></div><div class="spaceAbove"><strong>Authors:</strong><br />
Jose Camacho  |  Natalia Rioseco-Camacho   <a href="/books/NBK97260" target="NBK97260" title="NCBI Bookshelf: Hyperornithinemia-Hyperammonemia-Homocitrullinuria Syndrome">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 />Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome (HHHS) is an autosomal recessive, chronic and progressive disorder of the urea cycle with typical age of onset in early life. The acute phase is characterized by hyperammonemia accompanied by vomiting, ataxia, lethargy, confusion, and coma. Chronically, aversion to protein-rich foods, coagulation abnormalities, hypotonia, developmental delay, progressive encephalopathy with mental regression, and signs of motor dysfunction are present. About 95% of patients survive after diagnosis and therapy is established. However, in early adulthood most patients develop signs of pyramidal tract dysfunction (summary by Tessa et al., 2009).  <a target="_blank" href="http://www.omim.org/entry/238970">http://www.omim.org/entry/238970</a></div><div class="mgSection"><strong>From MedlinePlus Genetics</strong><br />Ornithine translocase deficiency is an inherited disorder that causes ammonia and other substances to build up (accumulate) in the blood. Ammonia, which is formed when proteins are broken down in the body, is toxic if the levels become too high. The nervous system is especially sensitive to the effects of excess ammonia.<br /><br />Ornithine translocase deficiency varies widely in its severity and age of onset. Affected infants show signs and symptoms of ornithine translocase deficiency within days after birth. In most affected individuals, however, signs and symptoms of ornithine translocase deficiency do not appear until later in life, with health problems first appearing anytime from childhood to adulthood. Later-onset forms of ornithine translocase deficiency are usually less severe than the infantile form.<br /><br />Infants with ornithine translocase deficiency may lack energy (be lethargic), refuse to eat, vomit frequently, or have poorly controlled breathing or body temperature. Seizures or unusual body movements are common in these individuals. Some people with this condition have intellectual disability or developmental delay, but others have normal intelligence. Severe cases may result in coma.<br /><br />Some people with later-onset ornithine translocase deficiency have episodes of vomiting, lethargy, problems with coordination (ataxia), vision problems, episodes of brain dysfunction (encephalopathy), developmental delay, learning disabilities, or stiffness caused by abnormal tensing of the muscles (spasticity). Affected individuals may have chronic liver problems and mild abnormal bleeding.<br /><br />Individuals with ornithine translocase deficiency often cannot tolerate high-protein foods, such as meat. Occasionally, high-protein meals or stress caused by illness or periods without food (fasting) may cause ammonia to accumulate more quickly in the blood. This rapid increase of ammonia likely leads to the signs and symptoms of ornithine translocase deficiency.<br /><br />While the signs and symptoms of ornithine translocase deficiency can vary greatly among affected individuals, proper treatment can prevent some complications from occurring and may improve quality of life.  <a target="_blank" href="https://medlineplus.gov/genetics/condition/ornithine-translocase-deficiency">https://medlineplus.gov/genetics/condition/ornithine-translocase-deficiency</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_382116"><div><strong>Homocitrullinuria</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>382116</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.">C2673490</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">An increased amount of L-homocitrulline in the urine. L-homocitrulline is an L-lysine derivative that is L-lysine having a carbamoyl group at the N(6)-position. It is found in individuals with urea cycle disorders.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/382116">Feature record</a> | <a href="/medgen?term=%22Homocitrullinuria%22%5BClinical%20Features%5D%20OR%20382116%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_746019"><div><strong>Failure to thrive</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>746019</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C2315100</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Failure to thrive (FTT) refers to a child whose physical growth is substantially below the norm.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/746019">Feature record</a> | <a href="/medgen?term=%22Failure%20to%20thrive%22%5BClinical%20Features%5D%20OR%20746019%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_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_65430"><div><strong>Decreased liver function</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>65430</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.">C0232744</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Reduced ability of the liver to perform its functions.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/65430">Feature record</a> | <a href="/medgen?term=%22Decreased%20liver%20function%22%5BClinical%20Features%5D%20OR%2065430%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_82759"><div><strong>Acute hepatitis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>82759</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.">C0267797</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Acute hepatic injury resulting from inflammation typically accompanied by increased serum alanine transaminase activity. Etiologies include viral hepatitis, drugs, toxins, and autoimmune disorders.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/82759">Feature record</a> | <a href="/medgen?term=%22Acute%20hepatitis%22%5BClinical%20Features%5D%20OR%2082759%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_333228"><div><strong>Episodic vomiting</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>333228</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.">C1838993</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Paroxysmal, recurrent episodes of vomiting.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/333228">Feature record</a> | <a href="/medgen?term=%22Episodic%20vomiting%22%5BClinical%20Features%5D%20OR%20333228%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_326521"><div><strong>Protein avoidance</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>326521</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.">C1839531</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/326521">Feature record</a> | <a href="/medgen?term=%22Protein%20avoidance%22%5BClinical%20Features%5D%20OR%20326521%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_40341"><div><strong>Clonus</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>40341</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.">C0009024</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">A series of rhythmic and involuntary muscle contractions (at a frequency of about 5 to 7 Hz) that occur in response to an abruptly applied and sustained stretch.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/40341">Feature record</a> | <a href="/medgen?term=%22Clonus%22%5BClinical%20Features%5D%20OR%2040341%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1054"><div><strong>Coma</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1054</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.">C0009421</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">The complete absence of wakefulness and consciousness, which is evident through a lack of response to any form of external stimuli.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1054">Feature record</a> | <a href="/medgen?term=%22Coma%22%5BClinical%20Features%5D%20OR%201054%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_3587"><div><strong>Confusion</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>3587</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.">C0009676</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Lack of clarity and coherence of thought, perception, understanding, or action.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/3587">Feature record</a> | <a href="/medgen?term=%22Confusion%22%5BClinical%20Features%5D%20OR%203587%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_7310"><div><strong>Lethargy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>7310</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.">C0023380</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">A state of fatigue, either physical or mental slowness and sluggishness, with difficulties in initiating or performing simple tasks. Distinguished from apathy which implies indifference and a lack of desire or interest in the task. A person with lethargy may have the desire, but not the energy to engage in personal or socially relevant tasks.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/7310">Feature record</a> | <a href="/medgen?term=%22Lethargy%22%5BClinical%20Features%5D%20OR%207310%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_44181"><div><strong>Spastic diplegia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>44181</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.">C0023882</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Spasticity (neuromuscular hypertonia) primarily in the muscles of the legs, hips, and pelvis.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/44181">Feature record</a> | <a href="/medgen?term=%22Spastic%20diplegia%22%5BClinical%20Features%5D%20OR%2044181%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_48638"><div><strong>Intellectual disability, severe</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>48638</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0036857</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Severe mental retardation is defined as an intelligence quotient (IQ) in the range of 20-34.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/48638">Feature record</a> | <a href="/medgen?term=%22Intellectual%20disability%2C%20severe%22%5BClinical%20Features%5D%20OR%2048638%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_52432"><div><strong>Spastic paraparesis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>52432</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.">C0037771</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">Mild or moderate loss of motor function accompanied by spasticity in the lower extremities. This condition is a manifestation of CENTRAL NERVOUS SYSTEM DISEASES that cause injury to the motor cortex or descending motor pathways.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/52432">Feature record</a> | <a href="/medgen?term=%22Spastic%20paraparesis%22%5BClinical%20Features%5D%20OR%2052432%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_20882"><div><strong>Spastic paraplegia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>20882</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.">C0037772</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Spasticity and weakness of the leg and hip muscles.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/20882">Feature record</a> | <a href="/medgen?term=%22Spastic%20paraplegia%22%5BClinical%20Features%5D%20OR%2020882%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_115907"><div><strong>Spastic gait</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>115907</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.">C0231687</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">Spasticity is manifested by increased stretch reflex which is intensified with movement velocity. This results in excessive and inappropriate muscle activation which can contribute to muscle hypertonia. Spastic gait is characterized by manifestations such as muscle hypertonia, stiff knee, and circumduction of the leg.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/115907">Feature record</a> | <a href="/medgen?term=%22Spastic%20gait%22%5BClinical%20Features%5D%20OR%20115907%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_68582"><div><strong>Abnormal pyramidal sign</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>68582</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.">C0234132</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">Functional neurological abnormalities related to dysfunction of the pyramidal tract.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/68582">Feature record</a> | <a href="/medgen?term=%22Abnormal%20pyramidal%20sign%22%5BClinical%20Features%5D%20OR%2068582%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_68583"><div><strong>Dysmetria</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>68583</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.">C0234162</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A type of ataxia characterized by the inability to carry out movements with the correct range and motion across the plane of more than one joint related to incorrect estimation of the distances required for targeted movements.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/68583">Feature record</a> | <a href="/medgen?term=%22Dysmetria%22%5BClinical%20Features%5D%20OR%2068583%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_115975"><div><strong>Dysdiadochokinesis</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>115975</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.">C0234979</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">A type of ataxia characterized by the impairment of the ability to perform rapidly alternating movements, such as pronating and supinating his or her hand on the dorsum of the other hand as rapidly as possible.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/115975">Feature record</a> | <a href="/medgen?term=%22Dysdiadochokinesis%22%5BClinical%20Features%5D%20OR%20115975%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_116113"><div><strong>Scanning speech</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>116113</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.">C0240952</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">An abnormal pattern of speech in which the words are as if measured or scanned; there is a pause after every syllable, and the syllables themselves are pronounced slowly.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/116113">Feature record</a> | <a href="/medgen?term=%22Scanning%20speech%22%5BClinical%20Features%5D%20OR%20116113%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_96535"><div><strong>Truncal ataxia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>96535</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.">C0427190</a></dd><dt><span class="dotprefix"></span></dt><dd>Sign or Symptom</dd></dl></div></div></div>
<div class="spaceAbove">Truncal ataxia is a sign of ataxia characterized by instability of the trunk. It usually occurs during sitting.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/96535">Feature record</a> | <a href="/medgen?term=%22Truncal%20ataxia%22%5BClinical%20Features%5D%20OR%2096535%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_107838"><div><strong>Global developmental delay</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>107838</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0557874</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/107838">Feature record</a> | <a href="/medgen?term=%22Global%20developmental%20delay%22%5BClinical%20Features%5D%20OR%20107838%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_107874"><div><strong>Poor coordination</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>107874</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.">C0563243</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove nowrap">See: <a href="/medgen/107874">Feature record</a> | <a href="/medgen?term=%22Poor%20coordination%22%5BClinical%20Features%5D%20OR%20107874%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_220959"><div><strong>Impaired vibratory sensation</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>220959</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.">C1295585</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A decrease in the ability to perceive vibration. Clinically, this is usually tested with a tuning fork which vibrates at 128 Hz and is applied to bony prominences such as the malleoli at the ankles or the metacarpal-phalangeal joints. There is a slow decay of vibration from the tuning fork. The degree of vibratory sense loss can be crudely estimated by counting the number of seconds that the examiner can perceive the vibration longer than the patient.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/220959">Feature record</a> | <a href="/medgen?term=%22Impaired%20vibratory%20sensation%22%5BClinical%20Features%5D%20OR%20220959%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_224930"><div><strong>Acute encephalopathy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>224930</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.">C1306587</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A life-threatening disorder characterized by delirium, seizures, and neuromuscular changes.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/224930">Feature record</a> | <a href="/medgen?term=%22Acute%20encephalopathy%22%5BClinical%20Features%5D%20OR%20224930%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_381392"><div><strong>Motor delay</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>381392</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C1854301</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A type of Developmental delay characterized by a delay in acquiring motor skills.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/381392">Feature record</a> | <a href="/medgen?term=%22Motor%20delay%22%5BClinical%20Features%5D%20OR%20381392%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_347509"><div><strong>Decreased nerve conduction velocity</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>347509</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.">C1857640</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div>
<div class="spaceAbove">A reduction in the speed at which electrical signals propagate along the axon of a neuron.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/347509">Feature record</a> | <a href="/medgen?term=%22Decreased%20nerve%20conduction%20velocity%22%5BClinical%20Features%5D%20OR%20347509%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_811461"><div><strong>Intellectual disability</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>811461</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.">C3714756</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Intellectual disability, previously referred to as mental retardation, is characterized by subnormal intellectual functioning that occurs during the developmental period. It is defined by an IQ score below 70.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/811461">Feature record</a> | <a href="/medgen?term=%22Intellectual%20disability%22%5BClinical%20Features%5D%20OR%20811461%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_892704"><div><strong>Generalized myoclonic seizure</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>892704</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.">C4021759</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">A generalized myoclonic seizure is a type of generalized motor seizure characterized by bilateral, 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/892704">Feature record</a> | <a href="/medgen?term=%22Generalized%20myoclonic%20seizure%22%5BClinical%20Features%5D%20OR%20892704%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_871302"><div><strong>Specific learning disability</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>871302</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.">C4025790</a></dd><dt><span class="dotprefix"></span></dt><dd>Mental or Behavioral Dysfunction</dd></dl></div></div></div>
<div class="spaceAbove">Impairment of certain skills such as reading or writing, coordination, self-control, or attention that interfere with the ability to learn. The impairment is not related to a global deficiency of intelligence.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/871302">Feature record</a> | <a href="/medgen?term=%22Specific%20learning%20disability%22%5BClinical%20Features%5D%20OR%20871302%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1646740"><div><strong>Cerebral cortical atrophy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1646740</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.">C4551583</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Atrophy of the cortex of the cerebrum.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/1646740">Feature record</a> | <a href="/medgen?term=%22Cerebral%20cortical%20atrophy%22%5BClinical%20Features%5D%20OR%201646740%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_109343"><div><strong>Hyperornithinemia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>109343</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.">C0599035</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Gyrate atrophy of the choroid and retina, which is often shortened to gyrate atrophy, is an inherited disorder characterized by progressive vision loss. People with this disorder have an ongoing loss of cells (atrophy) in the retina, which is the specialized light-sensitive tissue that lines the back of the eye, and in a nearby tissue layer called the choroid. During childhood, they begin experiencing nearsightedness (myopia), difficulty seeing in low light (night blindness), and loss of side (peripheral) vision. Over time, their field of vision continues to narrow, resulting in tunnel vision. Many people with gyrate atrophy also develop clouding of the lens of the eyes (cataracts). These progressive vision changes lead to blindness by about the age of 50.\n\nMost people with gyrate atrophy have no symptoms other than vision loss, but some have additional features of the disorder. Occasionally, newborns with gyrate atrophy develop excess ammonia in the blood (hyperammonemia), which may lead to poor feeding, vomiting, seizures, or coma. Neonatal hyperammonemia associated with gyrate atrophy generally responds quickly to treatment and does not recur after the newborn period.\n\nGyrate atrophy usually does not affect intelligence; however, abnormalities may be observed in brain imaging or other neurological testing. In some cases, mild to moderate intellectual disability is associated with gyrate atrophy.\n\nGyrate atrophy may also cause disturbances in the nerves connecting the brain and spinal cord to muscles and sensory cells (peripheral nervous system). In some people with the disorder these abnormalities lead to numbness, tingling, or pain in the hands or feet, while in others they are detectable only by electrical testing of the nerve impulses.\n\nIn some people with gyrate atrophy, a particular type of muscle fibers (type II fibers) break down over time. While this muscle abnormality usually causes no symptoms, it may result in mild weakness.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/109343">Feature record</a> | <a href="/medgen?term=%22Hyperornithinemia%22%5BClinical%20Features%5D%20OR%20109343%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_1802066"><div><strong>Hyperammonemia</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1802066</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.">C5574662</a></dd><dt><span class="dotprefix"></span></dt><dd>Laboratory or Test Result</dd></dl></div></div></div>
<div class="spaceAbove">An increased concentration of ammonia in the blood.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen?term=%22Hyperammonemia%22%5BClinical%20Features%5D%20OR%201802066%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_101805"><div><strong>Hypopigmentation of the fundus</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>101805</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.">C0151891</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Reduced pigmentation of the fundus, typically generalized. Fundoscopy may reveal a low level pigment in both RPE and choroid with clear visibility of choroidal vessels (pale/albinoid) or low pigment level in the RPE with deep pigment in choroid so that visible choroidal vessels are separated by deeply pigmented zones (tesselated/tigroid).</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/101805">Feature record</a> | <a href="/medgen?term=%22Hypopigmentation%20of%20the%20fundus%22%5BClinical%20Features%5D%20OR%20101805%5Buid%5D">Search on this feature</a></div></div>
<div class="divPopper rprt" id="clin_884881"><div><strong>Chorioretinal atrophy</strong><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>884881</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.">C4048273</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div>
<div class="spaceAbove">Atrophy of the choroid and retinal layers of the fundus.</div>
<div class="spaceAbove nowrap">See: <a href="/medgen/884881">Feature record</a> | <a href="/medgen?term=%22Chorioretinal%20atrophy%22%5BClinical%20Features%5D%20OR%20884881%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 metabolism/homeostasis</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1802066" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hyperammonemia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_109343" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hyperornithinemia</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_82759" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Acute hepatitis</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_65430" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Decreased liver function</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_333228" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Episodic vomiting</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_326521" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Protein avoidance</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_884881" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Chorioretinal atrophy</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_101805" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hypopigmentation of the fundus</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_382116" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Homocitrullinuria</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></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_68582" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Abnormal pyramidal sign</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_224930" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Acute encephalopathy</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1646740" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Cerebral cortical atrophy</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_40341" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Clonus</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_1054" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Coma</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_3587" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Confusion</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_347509" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Decreased nerve conduction velocity</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_115975" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Dysdiadochokinesis</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_68583" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Dysmetria</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_892704" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Generalized myoclonic seizure</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_107838" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Global developmental delay</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_57738" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Hyperreflexia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_220959" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Impaired vibratory sensation</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_811461" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_48638" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Intellectual disability, severe</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_7310" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Lethargy</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_381392" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Motor delay</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_107874" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Poor coordination</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_116113" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Scanning speech</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_44181" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spastic diplegia</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_115907" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spastic gait</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_52432" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spastic paraparesis</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_20882" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Spastic paraplegia</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_871302" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Specific learning disability</a></span></li><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_96535" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Truncal ataxia</a></span></li></ul></li><li><span class="TLline">Growth abnormality</span><ul><li class="TLline">
<span class="TLline"><a title="click for more information" class="jig-ncbipopper" href="#clin_746019" data-jigconfig="hasArrow: true, openEvent: 'click', closeEvent: 'mouseout', openAnimation: 'fadeIn', closeAnimation: 'fadeOut', triggerPosition: 'center right', destPosition: 'center left', arrowDirection: 'left'">Failure to thrive</a></span></li></ul></li></ul></div></div>
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<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=C0268540[DISCUI]&amp;test_type=Clinical" ref="ncbi_uid=82815">C</a></span><span class="chiclet unavailable round" title="Research Tests">R</span><span class="chiclet Ocolor" title="OMIM"><a ref="ncbi_uid=82815" target="_blank" href="/omim/238970">O</a></span><span class="chiclet Gcolor" title="GeneReviews"><a target="_blank" href="/books/NBK97260/" ref="ncbi_uid=82815">G</a></span><span class="chiclet Vcolor" title="ClinVar"><a target="_blank" href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=82815" ref="ncbi_uid=82815">V</a></span></span><span class="TLline">Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome</span></li></ul></div></div></div></div></div><div id="tabMGEN"><div class="ds_tree"><ul><li><span class="TLline"><a href="/medgen/14319" ref="tree=MeSH" title="MedGen record for Congenital, Hereditary, and Neonatal Diseases and Abnormalities">Congenital, Hereditary, and Neonatal Diseases and Abnormalities</a></span><ul><li><span class="TLline"><a href="/medgen/181981" ref="tree=MeSH" title="MedGen record for Inborn genetic diseases">Inborn genetic diseases</a></span><ul><li><span class="TLline"><a href="/medgen/6323" ref="tree=MeSH" title="MedGen record for Inborn errors of metabolism">Inborn errors of metabolism</a></span><ul><li><span class="TLline"><a href="/medgen/156005" ref="tree=MeSH" title="MedGen record for Brain Diseases, Metabolic, Inborn">Brain Diseases, Metabolic, Inborn</a></span><ul><li><span class="TLline"><a href="/medgen/57586" ref="tree=MeSH" title="MedGen record for Disorder of the urea cycle metabolism">Disorder of the urea cycle metabolism</a></span><ul><li><span class="matched_ds">Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome</span></li></ul></li></ul></li></ul></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=770&amp;search=Disease_Classif_Simple&amp;new=1" class="ital bold">this link</a> to review classifications for <span class="ital">Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome</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/30982989">Suggested guidelines for the diagnosis and management of urea cycle disorders: First revision.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Häberle J,
Burlina A,
Chakrapani A,
Dixon M,
Karall D,
Lindner M,
Mandel H,
Martinelli D,
Pintos-Morell G,
Santer R,
Skouma A,
Servais A,
Tal G,
Rubio V,
Huemer M,
Dionisi-Vici C</span><br />
<span class="medgenPMjournal">J Inherit Metab Dis</span>
2019 Nov;42(6):1192-1230.
Epub 2019 May 15
doi: 10.1002/jimd.12100.
<span class="bold">PMID: </span><a href="/pubmed/30982989" target="_blank">30982989</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(%22hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome%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 (1)</a></div></div>
</div>
<div class="display-none help-popup" id="guidelinesHelpPM">These guidelines are articles in PubMed that match specific search criteria developed by MedGen to capture the most relevant practice guidelines. This list may not be comprehensive and may include broader topics as well. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div><div class="display-none help-popup" id="guidelinesHelpCurated">These guidelines are manually curated by the MedGen team
to supplement articles available in PubMed. See the <a href="/medgen/docs/faq/" title="Frequently asked questions" target="_blank">FAQ</a> for details.</div>
<div class="portlet mgSection" id="ID_103">
<div class="portlet_head mgSectionHead ui-widget-header"><h1 class="nl" id="Recent_clinical_studies">Recent clinical studies</h1><a sid="103" href="#" class="portlet_shutter" title="Show/hide content"></a></div>
<div class="portlet_content ln"><h3 class="subhead">Etiology</h3>
<div class="nl"><a target="_blank" href="/pubmed/39597062">Hyperornithinemia-Hyperammonemia-Homocitrullinuria Syndrome in Vietnamese Patients.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Nguyen KN,
Tran VK,
Nguyen NL,
Can TBN,
Dang TKG,
Nguyen TH,
Do TTM,
Phuong LT,
Tran TH,
Ta TV,
Tu NH,
Vu CD</span><br />
<span class="medgenPMjournal">Medicina (Kaunas)</span>
2024 Nov 16;60(11)
doi: 10.3390/medicina60111877.
<span class="bold">PMID: </span><a href="/pubmed/39597062" target="_blank">39597062</a><a href="/pmc/articles/PMC11596723" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30243302">Late onset hyperornithinemia-hyperammonemia-homocitrullinuria syndrome - how web searching by the family solved unexplained unconsciousness: a case report.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Silfverberg T,
Sahlander F,
Enlund M,
Oscarson M,
Hårdstedt M</span><br />
<span class="medgenPMjournal">J Med Case Rep</span>
2018 Sep 23;12(1):274.
doi: 10.1186/s13256-018-1794-9.
<span class="bold">PMID: </span><a href="/pubmed/30243302" target="_blank">30243302</a><a href="/pmc/articles/PMC6151189" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/11552031">Clinical and molecular findings in hyperornithinemia-hyperammonemia-homocitrullinuria syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Salvi S,
Santorelli FM,
Bertini E,
Boldrini R,
Meli C,
Donati A,
Burlina AB,
Rizzo C,
Di Capua M,
Fariello G,
Dionisi-Vici C</span><br />
<span class="medgenPMjournal">Neurology</span>
2001 Sep 11;57(5):911-4.
doi: 10.1212/wnl.57.5.911.
<span class="bold">PMID: </span><a href="/pubmed/11552031" target="_blank">11552031</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3960284">Studies on a case of HHH-syndrome (hyperammonemia, hyperornithinemia, homocitrullinuria).</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hommes FA,
Roesel RA,
Metoki K,
Hartlage PL,
Dyken PR</span><br />
<span class="medgenPMjournal">Neuropediatrics</span>
1986 Feb;17(1):48-52.
doi: 10.1055/s-2008-1052499.
<span class="bold">PMID: </span><a href="/pubmed/3960284" target="_blank">3960284</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome%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 (4)</a></div><h3 class="subhead">Diagnosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/39597062">Hyperornithinemia-Hyperammonemia-Homocitrullinuria Syndrome in Vietnamese Patients.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Nguyen KN,
Tran VK,
Nguyen NL,
Can TBN,
Dang TKG,
Nguyen TH,
Do TTM,
Phuong LT,
Tran TH,
Ta TV,
Tu NH,
Vu CD</span><br />
<span class="medgenPMjournal">Medicina (Kaunas)</span>
2024 Nov 16;60(11)
doi: 10.3390/medicina60111877.
<span class="bold">PMID: </span><a href="/pubmed/39597062" target="_blank">39597062</a><a href="/pmc/articles/PMC11596723" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30982989">Suggested guidelines for the diagnosis and management of urea cycle disorders: First revision.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Häberle J,
Burlina A,
Chakrapani A,
Dixon M,
Karall D,
Lindner M,
Mandel H,
Martinelli D,
Pintos-Morell G,
Santer R,
Skouma A,
Servais A,
Tal G,
Rubio V,
Huemer M,
Dionisi-Vici C</span><br />
<span class="medgenPMjournal">J Inherit Metab Dis</span>
2019 Nov;42(6):1192-1230.
Epub 2019 May 15
doi: 10.1002/jimd.12100.
<span class="bold">PMID: </span><a href="/pubmed/30982989" target="_blank">30982989</a></div>
<div class="nl"><a target="_blank" href="/pubmed/30058227">Lactate/pyruvate in hyperornithinemia-hyperammonemia-homocitrullinuria syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ono H,
Tamada T,
Shigematsu Y</span><br />
<span class="medgenPMjournal">Pediatr Int</span>
2018 Aug;60(8):762-764.
Epub 2018 Jul 30
doi: 10.1111/ped.13608.
<span class="bold">PMID: </span><a href="/pubmed/30058227" target="_blank">30058227</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25874378">The hyperornithinemia-hyperammonemia-homocitrullinuria syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Martinelli D,
Diodato D,
Ponzi E,
Monné M,
Boenzi S,
Bertini E,
Fiermonte G,
Dionisi-Vici C</span><br />
<span class="medgenPMjournal">Orphanet J Rare Dis</span>
2015 Mar 11;10:29.
doi: 10.1186/s13023-015-0242-9.
<span class="bold">PMID: </span><a href="/pubmed/25874378" target="_blank">25874378</a><a href="/pmc/articles/PMC4358699" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/9329423">Neonatal onset of hyperornithinemia-hyperammonemia-homocitrullinuria syndrome with favorable outcome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Zammarchi E,
Ciani F,
Pasquini E,
Buonocore G,
Shih VE,
Donati MA</span><br />
<span class="medgenPMjournal">J Pediatr</span>
1997 Sep;131(3):440-3.
doi: 10.1016/s0022-3476(97)80072-8.
<span class="bold">PMID: </span><a href="/pubmed/9329423" target="_blank">9329423</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome%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 (14)</a></div><h3 class="subhead">Therapy</h3>
<div class="nl"><a target="_blank" href="/pubmed/30058227">Lactate/pyruvate in hyperornithinemia-hyperammonemia-homocitrullinuria syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Ono H,
Tamada T,
Shigematsu Y</span><br />
<span class="medgenPMjournal">Pediatr Int</span>
2018 Aug;60(8):762-764.
Epub 2018 Jul 30
doi: 10.1111/ped.13608.
<span class="bold">PMID: </span><a href="/pubmed/30058227" target="_blank">30058227</a></div>
<div class="nl"><a target="_blank" href="/pubmed/17825324">Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome with stroke-like imaging presentation: clinical, biochemical and molecular analysis.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Al-Hassnan ZN,
Rashed MS,
Al-Dirbashi OY,
Patay Z,
Rahbeeni Z,
Abu-Amero KK</span><br />
<span class="medgenPMjournal">J Neurol Sci</span>
2008 Jan 15;264(1-2):187-94.
Epub 2007 Sep 7
doi: 10.1016/j.jns.2007.08.003.
<span class="bold">PMID: </span><a href="/pubmed/17825324" target="_blank">17825324</a></div>
<div class="nl"><a target="_blank" href="/pubmed/9329423">Neonatal onset of hyperornithinemia-hyperammonemia-homocitrullinuria syndrome with favorable outcome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Zammarchi E,
Ciani F,
Pasquini E,
Buonocore G,
Shih VE,
Donati MA</span><br />
<span class="medgenPMjournal">J Pediatr</span>
1997 Sep;131(3):440-3.
doi: 10.1016/s0022-3476(97)80072-8.
<span class="bold">PMID: </span><a href="/pubmed/9329423" target="_blank">9329423</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3407856">Clinical, biochemical and ultrastructural study on the pathogenesis of hyperornithinemia-hyperammonemia-homocitrullinuria syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Nakajima M,
Ishii S,
Mito T,
Takeshita K,
Takashima S,
Takakura H,
Inoue I,
Saheki T,
Akiyoshi H,
Ichihara K</span><br />
<span class="medgenPMjournal">Brain Dev</span>
1988;10(3):181-5.
doi: 10.1016/s0387-7604(88)80025-1.
<span class="bold">PMID: </span><a href="/pubmed/3407856" target="_blank">3407856</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3116497">Hyperornithinemia-hyperammonemia-homocitrullinuria syndrome: low creatine excretion and effect of citrulline, arginine, or ornithine supplement.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Dionisi Vici C,
Bachmann C,
Gambarara M,
Colombo JP,
Sabetta G</span><br />
<span class="medgenPMjournal">Pediatr Res</span>
1987 Sep;22(3):364-7.
doi: 10.1203/00006450-198709000-00025.
<span class="bold">PMID: </span><a href="/pubmed/3116497" target="_blank">3116497</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome%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 (6)</a></div><h3 class="subhead">Prognosis</h3>
<div class="nl"><a target="_blank" href="/pubmed/30243302">Late onset hyperornithinemia-hyperammonemia-homocitrullinuria syndrome - how web searching by the family solved unexplained unconsciousness: a case report.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Silfverberg T,
Sahlander F,
Enlund M,
Oscarson M,
Hårdstedt M</span><br />
<span class="medgenPMjournal">J Med Case Rep</span>
2018 Sep 23;12(1):274.
doi: 10.1186/s13256-018-1794-9.
<span class="bold">PMID: </span><a href="/pubmed/30243302" target="_blank">30243302</a><a href="/pmc/articles/PMC6151189" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/25874378">The hyperornithinemia-hyperammonemia-homocitrullinuria syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Martinelli D,
Diodato D,
Ponzi E,
Monné M,
Boenzi S,
Bertini E,
Fiermonte G,
Dionisi-Vici C</span><br />
<span class="medgenPMjournal">Orphanet J Rare Dis</span>
2015 Mar 11;10:29.
doi: 10.1186/s13023-015-0242-9.
<span class="bold">PMID: </span><a href="/pubmed/25874378" target="_blank">25874378</a><a href="/pmc/articles/PMC4358699" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3960284">Studies on a case of HHH-syndrome (hyperammonemia, hyperornithinemia, homocitrullinuria).</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Hommes FA,
Roesel RA,
Metoki K,
Hartlage PL,
Dyken PR</span><br />
<span class="medgenPMjournal">Neuropediatrics</span>
1986 Feb;17(1):48-52.
doi: 10.1055/s-2008-1052499.
<span class="bold">PMID: </span><a href="/pubmed/3960284" target="_blank">3960284</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome%22%20AND%20Prognosis%2Fbroad%5Bfilter%5D%20%20AND%20%22english%20and%20humans%22%5Bfilter%5D%20NOT%20comment%5BPTYP%5D%20NOT%20letter%5BPTYP%5D" title="PubMed search">See all (3)</a></div><h3 class="subhead">Clinical prediction guides</h3>
<div class="nl"><a target="_blank" href="/pubmed/39597062">Hyperornithinemia-Hyperammonemia-Homocitrullinuria Syndrome in Vietnamese Patients.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Nguyen KN,
Tran VK,
Nguyen NL,
Can TBN,
Dang TKG,
Nguyen TH,
Do TTM,
Phuong LT,
Tran TH,
Ta TV,
Tu NH,
Vu CD</span><br />
<span class="medgenPMjournal">Medicina (Kaunas)</span>
2024 Nov 16;60(11)
doi: 10.3390/medicina60111877.
<span class="bold">PMID: </span><a href="/pubmed/39597062" target="_blank">39597062</a><a href="/pmc/articles/PMC11596723" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/38833093">Hyperornithinemia-hyperammonemia-homocitrullinuria: a rare neurometabolic disorder in two siblings.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Rizkallah D,
Daher RT,
Haddad L,
Karam PE</span><br />
<span class="medgenPMjournal">Metab Brain Dis</span>
2024 Jun;39(5):909-913.
Epub 2024 Jun 4
doi: 10.1007/s11011-024-01366-z.
<span class="bold">PMID: </span><a href="/pubmed/38833093" target="_blank">38833093</a></div>
<div class="nl"><a target="_blank" href="/pubmed/35711415">Immune Alterations in a Patient With Hyperornithinemia-Hyperammonemia-Homocitrullinuria Syndrome: A Case Report.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Silvera-Ruiz SM,
Gemperle C,
Peano N,
Olivero V,
Becerra A,
Häberle J,
Gruppi A,
Larovere LE,
Motrich RD</span><br />
<span class="medgenPMjournal">Front Immunol</span>
2022;13:861516.
Epub 2022 May 27
doi: 10.3389/fimmu.2022.861516.
<span class="bold">PMID: </span><a href="/pubmed/35711415" target="_blank">35711415</a><a href="/pmc/articles/PMC9196877" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div class="nl"><a target="_blank" href="/pubmed/19683047">Evidence that the major metabolites accumulating in hyperornithinemia-hyperammonemia-homocitrullinuria syndrome induce oxidative stress in brain of young rats.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Amaral AU,
Leipnitz G,
Fernandes CG,
Seminotti B,
Zanatta A,
Viegas CM,
Dutra-Filho CS,
Wajner M</span><br />
<span class="medgenPMjournal">Int J Dev Neurosci</span>
2009 Nov;27(7):635-41.
Epub 2009 Aug 13
doi: 10.1016/j.ijdevneu.2009.08.004.
<span class="bold">PMID: </span><a href="/pubmed/19683047" target="_blank">19683047</a></div>
<div class="nl"><a target="_blank" href="/pubmed/3652557">The hyperornithinemia, hyperammonemia, homocitrullinuria syndrome: an ornithine transport defect remediable with ornithine supplements.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Gordon BA,
Gatfield DP,
Haust MD</span><br />
<span class="medgenPMjournal">Clin Invest Med</span>
1987 Jul;10(4):329-36.
<span class="bold">PMID: </span><a href="/pubmed/3652557" target="_blank">3652557</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome%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 (5)</a></div></div>
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<div class="nl"><a target="_blank" href="/pubmed/25874378">The hyperornithinemia-hyperammonemia-homocitrullinuria syndrome.</a></div>
<div class="portlet_content ln"><span class="medgenPMauthor">Martinelli D,
Diodato D,
Ponzi E,
Monné M,
Boenzi S,
Bertini E,
Fiermonte G,
Dionisi-Vici C</span><br />
<span class="medgenPMjournal">Orphanet J Rare Dis</span>
2015 Mar 11;10:29.
doi: 10.1186/s13023-015-0242-9.
<span class="bold">PMID: </span><a href="/pubmed/25874378" target="_blank">25874378</a><a href="/pmc/articles/PMC4358699" target="_blank" class="PubMedFree">Free PMC Article</a></div>
<div><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=%22Hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome%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 (1)</a></div></div>
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<div class="portlet_content ln"><ul id="my-toc"></ul></div>
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<div class="portlet_content ln"><ul><li><a href="/gtr/tests?term=C0268540%5bDISCUI%5d&amp;filter=method%3A1%5F1" target="_blank">Analyte (4)</a></li>
<li><a href="/gtr/tests?term=C0268540%5bDISCUI%5d&amp;filter=method%3A2%5F8" target="_blank">Deletion/duplication analysis (46)</a></li>
<li><a href="/gtr/tests?term=C0268540%5bDISCUI%5d&amp;filter=method%3A1%5F2" target="_blank">Enzyme assay (2)</a></li>
<li><a href="/gtr/tests?term=C0268540%5bDISCUI%5d&amp;filter=method%3A2%5F9" target="_blank">Sequence analysis of select exons (10)</a></li>
<li><a href="/gtr/tests?term=C0268540%5bDISCUI%5d&amp;filter=method%3A2%5F7" target="_blank">Sequence analysis of the entire coding region (64)</a></li>
<li><a href="/gtr/tests?term=C0268540%5bDISCUI%5d&amp;filter=method%3A2%5F19" target="_blank">Targeted variant analysis (16)</a></li>
<li class="portletSeeAll portletSeeAllPad"><total><a href="/gtr/tests?term=C0268540%5bDISCUI%5d" target="_blank">See all (77)</a></total></li>
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<div class="portlet_content ln"><ul class="a_poppers"><li><a target="_blank" href="https://pubmed.ncbi.nlm.nih.gov/?term=(%22hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome%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>
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<div class="portlet_content ln"><ul><li><a href="http://www.diseaseinfosearch.org/Ornithine+translocase+deficiency+syndrome/5413" target="_blank">Genetic Alliance</a></li><li><a href="https://www.malacards.org/card/hyperornithinemia_hyperammonemia_homocitrullinuria_syndrome" target="_blank">MalaCards</a></li><li><a href="https://vsearch.nlm.nih.gov/vivisimo/cgi-bin/query-meta?v:project=medlineplus&amp;query=Hyperornithinemia-hyperammonemia-homocitrullinuria%20syndrome" target="_blank">MedlinePlus</a></li><li><a href="https://medlineplus.gov/genetics/condition/ornithine-translocase-deficiency" target="_blank">MedlinePlusGenetics (GHR)</a></li><li><a href="https://rarediseases.info.nih.gov/diseases/2830/disease" target="_blank">NCATS Office of Rare Diseases Research (GARD)</a></li></ul></div>
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