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<div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox82777" class="ui-helper-hidden-accessible">Select item 82777</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="1" type="checkbox" id="UidCheckBox82777" value="82777" /><span>1.</span></div><div class="rslt"><p class="title"><a href="/medgen/82777" ref="ordinalpos=1&amp;ncbi_uid=82777&amp;link_uid=82777">Deficiency of UDPglucose-hexose-1-phosphate uridylyltransferase</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">The term "galactosemia" refers to disorders of galactose metabolism that include classic galactosemia, clinical variant galactosemia, and biochemical variant galactosemia (not covered in this chapter). This GeneReview focuses on: Classic galactosemia, which can result in life-threatening complications including feeding problems, failure to thrive, hepatocellular damage, bleeding, and E coli sepsis in untreated infants. If a lactose-restricted diet is provided during the first ten days of life, the neonatal signs usually quickly resolve and the complications of liver failure, sepsis, and neonatal death are prevented; however, despite adequate treatment from an early age, children with classic galactosemia remain at increased risk for developmental delays, speech problems (termed childhood apraxia of speech and dysarthria), and abnormalities of motor function. Almost all females with classic galactosemia manifest hypergonadatropic hypogonadism or premature ovarian insufficiency (POI). Clinical variant galactosemia, which can result in life-threatening complications including feeding problems, failure to thrive, hepatocellular damage including cirrhosis, and bleeding in untreated infants. This is exemplified by the disease that occurs in African Americans and native Africans in South Africa. Persons with clinical variant galactosemia may be missed with newborn screening as the hypergalactosemia is not as marked as in classic galactosemia and breath testing is normal. If a lactose-restricted diet is provided during the first ten days of life, the severe acute neonatal complications are usually prevented. African Americans with clinical variant galactosemia and adequate early treatment do not appear to be at risk for long-term complications, including POI. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>82777</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.">C0268151</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0268151%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=82777" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=82777" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/230400" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=82777" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox66323" class="ui-helper-hidden-accessible">Select item 66323</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="2" type="checkbox" id="UidCheckBox66323" value="66323" /><span>2.</span></div><div class="rslt"><p class="title"><a href="/medgen/66323" ref="ordinalpos=2&amp;ncbi_uid=66323&amp;link_uid=66323">Biotinidase deficiency</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Multiple carboxylase deficiency (MCD) is an autosomal recessive metabolic disorder characterized primarily by cutaneous and neurologic abnormalities. Symptoms result from the patient's inability to reutilize biotin, a necessary nutrient. Sweetman (1981) recognized that multiple carboxylase deficiency could be classified into early (see 253270) and late forms. The early form showed higher urinary excretion of 3-hydroxyisovaleric acid and 3-hydroxypropionic acid than the late form and was associated with normal plasma biotin concentrations. Sweetman (1981) proposed a defect in holocarboxylase synthetase and intestinal biotin absorption, respectively.&#13; Some patients with biotinidase deficiency present in infancy (Baumgartner et al., 1985; Kalayci et al., 1994), and some individuals with this deficiency are asymptomatic (Wolf et al., 1997). [from <a title="Online Mendelian Inheritance in Man" href="http://www.omim.org" class="defSource" target="_blank">OMIM</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>66323</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.">C0220754</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0220754%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=66323" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=66323" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/253260" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=66323" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox75692" class="ui-helper-hidden-accessible">Select item 75692</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="3" type="checkbox" id="UidCheckBox75692" value="75692" /><span>3.</span></div><div class="rslt"><p class="title"><a href="/medgen/75692" ref="ordinalpos=3&amp;ncbi_uid=75692&amp;link_uid=75692">Ornithine carbamoyltransferase deficiency</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Ornithine transcarbamylase (OTC) deficiency can occur as a severe neonatal-onset disease in males (but rarely in females) and as a post-neonatal-onset (also known as "late-onset" or partial deficiency) disease in males and females. Males with severe neonatal-onset OTC deficiency are asymptomatic at birth but become symptomatic from hyperammonemia in the first week of life, most often on day two to three of life, and are usually catastrophically ill by the time they come to medical attention. After successful treatment of neonatal hyperammonemic coma these infants can easily become hyperammonemic again despite appropriate treatment; they typically require liver transplant to improve quality of life. Males and heterozygous females with post-neonatal-onset (partial) OTC deficiency can present from infancy to later childhood, adolescence, or adulthood. No matter how mild the disease, a hyperammonemic crisis can be precipitated by stressors and become a life-threatening event at any age and in any situation in life. For all individuals with OTC deficiency, typical neuropsychological complications include developmental delay, learning disabilities, intellectual disability, attention-deficit/hyperactivity disorder, and executive function deficits. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>75692</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.">C0268542</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0268542%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=75692" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=75692" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/311250" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=75692" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox1648491" class="ui-helper-hidden-accessible">Select item 1648491</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="4" type="checkbox" id="UidCheckBox1648491" value="1648491" /><span>4.</span></div><div class="rslt"><p class="title"><a href="/medgen/1648491" ref="ordinalpos=4&amp;ncbi_uid=1648491&amp;link_uid=1648491">Citrullinemia type I</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Citrullinemia type I (CTLN1) presents as a spectrum that includes a neonatal acute form (the "classic" form), a milder late-onset form (the "non-classic" form), a form in which women have onset of symptoms at pregnancy or post partum, and a form without symptoms or hyperammonemia. Distinction between the forms is based primarily on clinical findings, although emerging evidence suggests that measurement of residual argininosuccinate synthase enzyme activity may help to predict those who are likely to have a severe phenotype and those who are likely to have an attenuated phenotype. Infants with the acute neonatal form appear normal at birth. Shortly thereafter, they develop hyperammonemia and become progressively lethargic, feed poorly, often vomit, and may develop signs of increased intracranial pressure (ICP). Without prompt intervention, hyperammonemia and the accumulation of other toxic metabolites (e.g., glutamine) result in increased ICP, increased neuromuscular tone, spasticity, ankle clonus, seizures, loss of consciousness, and death. Children with the severe form who are treated promptly may survive for an indeterminate period of time, but usually with significant neurologic deficits. Even with chronic protein restriction and scavenger therapy, long-term complications such as liver failure and other (rarely reported) organ system manifestations are possible. The late-onset form may be milder than that seen in the acute neonatal form, but commences later in life for reasons that are not completely understood. The episodes of hyperammonemia are similar to those seen in the acute neonatal form, but the initial neurologic findings may be more subtle because of the older age of the affected individuals. Women with onset of severe symptoms including acute hepatic decompensation during pregnancy or in the postpartum period have been reported. Furthermore, previously asymptomatic and non-pregnant individuals have been described who remained asymptomatic up to at least age ten years, with the possibility that they could remain asymptomatic lifelong. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>1648491</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.">C4721769</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C4721769%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=1648491" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=1648491" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/215700" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=1648491" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox75696" class="ui-helper-hidden-accessible">Select item 75696</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="5" type="checkbox" id="UidCheckBox75696" value="75696" /><span>5.</span></div><div class="rslt"><p class="title"><a href="/medgen/75696" ref="ordinalpos=5&amp;ncbi_uid=75696&amp;link_uid=75696">Multiple acyl-CoA dehydrogenase deficiency</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Multiple acyl-CoA dehydrogenase deficiency (MADD) represents a clinical spectrum in which presentations can be divided into type I (neonatal onset with congenital anomalies), type II (neonatal onset without congenital anomalies), and type III (late onset). Individuals with type I or II MADD typically become symptomatic in the neonatal period with severe metabolic acidosis, which may be accompanied by profound hypoglycemia and hyperammonemia. Many affected individuals die in the newborn period despite metabolic treatment. In those who survive the neonatal period, recurrent metabolic decompensation resembling Reye syndrome and the development of hypertrophic cardiomyopathy can occur. Congenital anomalies may include dysmorphic facial features, large cystic kidneys, hypospadias and chordee in males, and neuronal migration defects (heterotopias) on brain MRI. Individuals with type III MADD, the most common presentation, can present from infancy to adulthood. The most common symptoms are muscle weakness, exercise intolerance, and/or muscle pain, although metabolic decompensation with episodes of rhabdomyolysis can also be seen. Rarely, individuals with late-onset MADD (type III) may develop severe sensory neuropathy in addition to proximal myopathy. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>75696</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.">C0268596</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0268596%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=75696" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=75696" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/231680" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=75696" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox78688" class="ui-helper-hidden-accessible">Select item 78688</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="6" type="checkbox" id="UidCheckBox78688" value="78688" /><span>6.</span></div><div class="rslt"><p class="title"><a href="/medgen/78688" ref="ordinalpos=6&amp;ncbi_uid=78688&amp;link_uid=78688">Arginase deficiency</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Arginase deficiency in untreated individuals is characterized by episodic hyperammonemia of variable degree that is infrequently severe enough to be life threatening or to cause death. Most commonly, birth and early childhood are normal. Untreated individuals have slowing of linear growth at age one to three years, followed by development of spasticity, plateauing of cognitive development, and subsequent loss of developmental milestones. If untreated, arginase deficiency usually progresses to severe spasticity, loss of ambulation, complete loss of bowel and bladder control, and severe intellectual disability. Seizures are common and are usually controlled easily. Individuals treated from birth, either as a result of newborn screening or having an affected older sib, appear to have minimal symptoms. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>78688</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.">C0268548</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0268548%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=78688" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=78688" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/207800" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=78688" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox44131" class="ui-helper-hidden-accessible">Select item 44131</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="7" type="checkbox" id="UidCheckBox44131" value="44131" /><span>7.</span></div><div class="rslt"><p class="title"><a href="/medgen/44131" ref="ordinalpos=7&amp;ncbi_uid=44131&amp;link_uid=44131">Galactosylceramide beta-galactosidase deficiency</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Krabbe disease comprises a spectrum ranging from infantile-onset disease (i.e., onset of extreme irritability, spasticity, and developmental delay before age 12 months) to later-onset disease (i.e., onset of manifestations after age 12 months and as late as the seventh decade). Although historically 85%-90% of symptomatic individuals with Krabbe disease diagnosed by enzyme activity alone have infantile-onset Krabbe disease and 10%-15% have later-onset Krabbe disease, the experience with newborn screening (NBS) suggests that the proportion of individuals with possible later-onset Krabbe disease is higher than previously thought. Infantile-onset Krabbe disease is characterized by normal development in the first few months followed by rapid severe neurologic deterioration; the average age of death is 24 months (range 8 months to 9 years). Later-onset Krabbe disease is much more variable in its presentation and disease course. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>44131</dd><dt><span class="dotprefix"></span>Concept ID: </dt><dd><a href="/medgen/docs/help/#sources" target="_blank" title="Concept Unique Identifier from NLM's Unified Medical Language system (UMLS)&#10;Click for more information.">C0023521</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0023521%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=44131" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=44131" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/245200" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=44131" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox78687" class="ui-helper-hidden-accessible">Select item 78687</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="8" type="checkbox" id="UidCheckBox78687" value="78687" /><span>8.</span></div><div class="rslt"><p class="title"><a href="/medgen/78687" ref="ordinalpos=8&amp;ncbi_uid=78687&amp;link_uid=78687">Argininosuccinate lyase deficiency</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Deficiency of argininosuccinate lyase (ASL), the enzyme that cleaves argininosuccinic acid to produce arginine and fumarate in the fourth step of the urea cycle, may present as a severe neonatal-onset form or a late-onset form: The severe neonatal-onset form is characterized by hyperammonemia within the first few days after birth that can manifest as increasing lethargy, somnolence, refusal to feed, <b>vomiting</b>, tachypnea, and respiratory alkalosis. Absence of treatment leads to worsening lethargy, seizures, coma, and even death. In contrast, the manifestations of late-onset form range from episodic hyperammonemia triggered by acute infection or stress to cognitive impairment, behavioral abnormalities, and/or learning disabilities in the absence of any documented episodes of hyperammonemia. Manifestations of ASL deficiency that appear to be unrelated to the severity or duration of hyperammonemic episodes: Neurocognitive deficiencies (attention-deficit/hyperactivity disorder, developmental delay, seizures, and learning disability). Liver disease (hepatitis, cirrhosis). Trichorrhexis nodosa (coarse brittle hair that breaks easily). Systemic hypertension. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>78687</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.">C0268547</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0268547%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=78687" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=78687" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/207900" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=78687" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox75694" class="ui-helper-hidden-accessible">Select item 75694</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="9" type="checkbox" id="UidCheckBox75694" value="75694" /><span>9.</span></div><div class="rslt"><p class="title"><a href="/medgen/75694" ref="ordinalpos=9&amp;ncbi_uid=75694&amp;link_uid=75694">Propionic acidemia</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">The spectrum of propionic acidemia (PA) ranges from neonatal onset to late-onset disease. Neonatal-onset PA, the most common form, is characterized by a healthy newborn with poor feeding and decreased arousal in the first few days of life, followed by progressive encephalopathy of unexplained origin. Without prompt diagnosis (often through newborn screening) and management, this is followed by progressive encephalopathy manifesting as lethargy, seizures, or coma that can result in death. It is frequently accompanied by metabolic acidosis with anion gap, lactic acidosis, ketonuria, hypoglycemia, hyperammonemia, and cytopenias. Individuals with late-onset PA may remain asymptomatic and suffer a metabolic crisis under catabolic stress (e.g., illness, surgery, fasting) or may experience a more insidious onset with the development of multiorgan complications including <b>vomiting</b>, protein intolerance, failure to thrive, hypotonia, developmental delays or regression, movement disorders, or cardiomyopathy. Isolated cardiomyopathy can be observed on rare occasions in the absence of clinical metabolic decompensation or neurocognitive deficits. Manifestations of neonatal-onset and late-onset PA over time can include growth impairment, intellectual disability, seizures, basal ganglia lesions, pancreatitis, cardiomyopathy, and chronic kidney disease. Other rarely reported complications include optic atrophy, sensorineural hearing loss, and premature ovarian insufficiency. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>75694</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.">C0268579</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0268579%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=75694" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=75694" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/606054" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=75694" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox41678" class="ui-helper-hidden-accessible">Select item 41678</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="10" type="checkbox" id="UidCheckBox41678" value="41678" /><span>10.</span></div><div class="rslt"><p class="title"><a href="/medgen/41678" ref="ordinalpos=10&amp;ncbi_uid=41678&amp;link_uid=41678">Familial dysautonomia</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Familial dysautonomia, which affects the development and survival of sensory, sympathetic, and parasympathetic neurons, is a debilitating disorder present from birth. Neuronal degeneration progresses throughout life. Affected individuals have gastrointestinal dysfunction, autonomic crises (i.e., hypertensive <b>vomiting</b> attacks), recurrent pneumonia, altered pain sensitivity, altered temperature perception, and blood pressure instability. Hypotonia contributes to delay in acquisition of motor milestones. Optic neuropathy results in progressive vision loss. Older individuals often have a broad-based and ataxic gait that deteriorates over time. Developmental delay / intellectual disability occur in about 21% of individuals. Life expectancy is decreased. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>41678</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.">C0013364</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0013364%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=41678" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=41678" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/223900" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=41678" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox8083" class="ui-helper-hidden-accessible">Select item 8083</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="11" type="checkbox" id="UidCheckBox8083" value="8083" /><span>11.</span></div><div class="rslt"><p class="title"><a href="/medgen/8083" ref="ordinalpos=11&amp;ncbi_uid=8083&amp;link_uid=8083">Fabry disease</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Fabry disease is the most common of the lysosomal storage disorders and results from deficient activity of the enzyme alpha-galactosidase A (a-Gal A), leading to progressive lysosomal deposition of globotriaosylceramide and its derivatives in cells throughout the body. The classic form, occurring in males with less than 1% a-Gal A enzyme activity, usually has its onset in childhood or adolescence with periodic crises of severe pain in the extremities (acroparesthesia), the appearance of vascular cutaneous lesions (angiokeratomas), sweating abnormalities (anhidrosis, hypohidrosis, and rarely hyperhidrosis), characteristic corneal and lenticular opacities, and proteinuria. Gradual deterioration of kidney function to end-stage kidney disease (ESKD) usually occurs in men in the third to fifth decade. In middle age, most males successfully treated for ESKD develop cardiac and/or cerebrovascular disease, a major cause of morbidity and mortality. Heterozygous females typically have milder symptoms at a later age of onset than males. Rarely, females may be relatively asymptomatic throughout a normal life span or may have symptoms as severe as those observed in males with the classic phenotype. In contrast, late-onset forms occur in males with greater than 1% a-Gal A activity. Clinical manifestations include cardiac disease, which usually presents in the sixth to eighth decade with left ventricular hypertrophy, cardiomyopathy, arrhythmia, and proteinuria; kidney failure, associated with ESKD but without the skin lesions or pain; or cerebrovascular disease presenting as stroke or transient ischemic attack. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>8083</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.">C0002986</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0002986%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=8083" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=8083" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/301500" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=8083" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox78650" class="ui-helper-hidden-accessible">Select item 78650</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="12" type="checkbox" id="UidCheckBox78650" value="78650" /><span>12.</span></div><div class="rslt"><p class="title"><a href="/medgen/78650" ref="ordinalpos=12&amp;ncbi_uid=78650&amp;link_uid=78650">Niemann-Pick disease, type A</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">The phenotype of acid sphingomyelinase deficiency (ASMD) occurs along a continuum. Individuals with the severe early-onset form, infantile neurovisceral ASMD, were historically diagnosed with Niemann-Pick disease type A (NPD-A). The later-onset, chronic visceral form of ASMD is also referred to as Niemann-Pick disease type B (NPD-B). A phenotype with intermediate severity is also known as chronic neurovisceral ASMD (NPD-A/B). Enzyme replacement therapy (ERT) is currently FDA approved for the non-central nervous system manifestations of ASMD, regardless of type. As more affected individuals are treated with ERT for longer periods of time, the natural history of ASMD is likely to change. The most common presenting symptom in untreated NPD-A is hepatosplenomegaly, usually detectable by age three months; over time the liver and spleen become massive in size. Growth failure typically becomes evident by the second year of life. Psychomotor development progresses no further than the 12-month level, after which neurologic deterioration is relentless. This feature may not be amenable to ERT. A classic cherry-red spot of the macula of the retina, which may not be present in the first few months, is eventually present in all affected children, although it is unclear if ERT will have an impact on this. Interstitial lung disease caused by storage of sphingomyelin in pulmonary macrophages results in frequent respiratory infections and often respiratory failure. Most untreated children succumb before the third year of life. NPD-B generally presents later than NPD-A, and the manifestations are less severe. NPD-B is characterized in untreated individuals by progressive hepatosplenomegaly, gradual deterioration in liver and pulmonary function, osteopenia, and atherogenic lipid profile. No central nervous system manifestations occur. Individuals with NPD-A/B have symptoms that are intermediate between NPD-A and NPD-B. The presentation in individuals with NPD-A/B varies greatly, although all are characterized by the presence of some central nervous system manifestations. Survival to adulthood can occur in individuals with NPD-B and NPD-A/B, even when untreated. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>78650</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.">C0268242</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0268242%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=78650" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=78650" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/257200" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=78650" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox138111" class="ui-helper-hidden-accessible">Select item 138111</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="13" type="checkbox" id="UidCheckBox138111" value="138111" /><span>13.</span></div><div class="rslt"><p class="title"><a href="/medgen/138111" ref="ordinalpos=13&amp;ncbi_uid=138111&amp;link_uid=138111">PMM2-congenital disorder of glycosylation</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">PMM2-CDG, the most common of a group of disorders of abnormal glycosylation of N-linked oligosaccharides, is divided into three clinical stages: infantile multisystem, late-infantile and childhood ataxiaintellectual disability, and adult stable disability. The clinical manifestations and course are highly variable, ranging from infants who die in the first year of life to mildly affected adults. Clinical findings tend to be similar in sibs. In the infantile multisystem presentation, infants show axial hypotonia, hyporeflexia, esotropia, and developmental delay. Feeding issues, <b>vomiting</b>, faltering growth, and developmental delay are frequently seen. Subcutaneous fat may be excessive over the buttocks and suprapubic region. Two distinct clinical courses are observed: (1) a nonfatal neurologic course with faltering growth, strabismus, developmental delay, cerebellar hypoplasia, and hepatopathy in infancy followed by neuropathy and retinitis pigmentosa in the first or second decade; and (2) a more severe neurologic-multivisceral course with approximately 20% mortality in the first year of life. The late-infantile and childhood ataxiaintellectual disability stage, which begins between ages three and ten years, is characterized by hypotonia, ataxia, severely delayed language and motor development, inability to walk, and IQ of 40 to 70; other findings include seizures, stroke-like episodes or transient unilateral loss of function, coagulopathy, retinitis pigmentosa, joint contractures, and skeletal deformities. In the adult stable disability stage, intellectual ability is stable; peripheral neuropathy is variable, progressive retinitis pigmentosa and myopia are seen, thoracic and spinal deformities with osteoporosis worsen, and premature aging is observed; females may lack secondary sexual development and males may exhibit decreased testicular volume. Hypogonadotropic hypogonadism and coagulopathy may occur. The risk for deep venous thrombosis is increased. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>138111</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.">C0349653</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0349653%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=138111" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=138111" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/212065" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=138111" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox45811" class="ui-helper-hidden-accessible">Select item 45811</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="14" type="checkbox" id="UidCheckBox45811" value="45811" /><span>14.</span></div><div class="rslt"><p class="title"><a href="/medgen/45811" ref="ordinalpos=14&amp;ncbi_uid=45811&amp;link_uid=45811">Familial Mediterranean fever</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Familial Mediterranean fever (FMF) is divided into two phenotypes: type 1 and type 2. FMF type 1 is characterized by recurrent short episodes of inflammation and serositis including fever, peritonitis, synovitis, pleuritis, and, rarely, pericarditis and meningitis. The symptoms and severity vary among affected individuals, sometimes even among members of the same family. Amyloidosis, which can lead to kidney failure, is the most severe complication, if untreated. FMF type 2 is characterized by amyloidosis as the first clinical manifestation of FMF in an otherwise asymptomatic individual. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>45811</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.">C0031069</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0031069%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=45811" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=45811" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/249100" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=45811" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox90999" class="ui-helper-hidden-accessible">Select item 90999</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="15" type="checkbox" id="UidCheckBox90999" value="90999" /><span>15.</span></div><div class="rslt"><p class="title"><a href="/medgen/90999" ref="ordinalpos=15&amp;ncbi_uid=90999&amp;link_uid=90999">Renal carnitine transport defect</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Primary carnitine deficiency (PCD) is a disorder of the carnitine cycle that results in defective fatty acid oxidation. If untreated, it encompasses a broad clinical spectrum including: (1) metabolic decompensation in infancy typically presenting between age three months and two years with episodes of hypoketotic hypoglycemia, poor feeding, irritability, lethargy, hepatomegaly, elevated liver transaminases, and hyperammonemia triggered by fasting or common illnesses such as upper respiratory tract infection or gastroenteritis; (2) childhood myopathy involving heart and skeletal muscle with onset between age two and four years; (3) pregnancy-related decreased stamina or exacerbation of cardiac arrhythmia; (4) fatigability in adulthood; and (5) absence of symptoms. The latter two categories often include mothers diagnosed with PCD after newborn screening has identified low carnitine levels in their infants. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>90999</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.">C0342788</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0342788%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=90999" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=90999" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/212140" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=90999" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox341256" class="ui-helper-hidden-accessible">Select item 341256</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="16" type="checkbox" id="UidCheckBox341256" value="341256" /><span>16.</span></div><div class="rslt"><p class="title"><a href="/medgen/341256" ref="ordinalpos=16&amp;ncbi_uid=341256&amp;link_uid=341256">Cobalamin C disease</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Disorders of intracellular cobalamin metabolism have a variable phenotype and age of onset that are influenced by the severity and location within the pathway of the defect. The prototype and best understood phenotype is cblC; it is also the most common of these disorders. The age of initial presentation of cblC spans a wide range: In utero with fetal presentation of nonimmune hydrops, cardiomyopathy, and intrauterine growth restriction. Newborns, who can have microcephaly, poor feeding, and encephalopathy. Infants, who can have poor feeding and slow growth, neurologic abnormality, and, rarely, hemolytic uremic syndrome (HUS). Toddlers, who can have poor growth, progressive microcephaly, cytopenias (including megaloblastic anemia), global developmental delay, encephalopathy, and neurologic signs such as hypotonia and seizures. Adolescents and adults, who can have neuropsychiatric symptoms, progressive cognitive decline, thromboembolic complications, and/or subacute combined degeneration of the spinal cord. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>341256</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.">C1848561</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C1848561%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=341256" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=341256" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/277400" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=341256" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox907954" class="ui-helper-hidden-accessible">Select item 907954</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="17" type="checkbox" id="UidCheckBox907954" value="907954" /><span>17.</span></div><div class="rslt"><p class="title"><a href="/medgen/907954" ref="ordinalpos=17&amp;ncbi_uid=907954&amp;link_uid=907954">Congenital hyperammonemia, type I</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Carbamoyl phosphate synthetase I deficiency is an autosomal recessive inborn error of metabolism of the urea cycle which causes hyperammonemia. There are 2 main forms: a lethal neonatal type and a less severe, delayed-onset type (summary by Klaus et al., 2009).&#13; Urea cycle disorders are characterized by the triad of hyperammonemia, encephalopathy, and respiratory alkalosis. Five disorders involving different defects in the biosynthesis of the enzymes of the urea cycle have been described: ornithine transcarbamylase deficiency (311250), carbamyl phosphate synthetase deficiency, argininosuccinate synthetase deficiency, or citrullinemia (215700), argininosuccinate lyase deficiency (207900), and arginase deficiency (207800). [from <a title="Online Mendelian Inheritance in Man" href="http://www.omim.org" class="defSource" target="_blank">OMIM</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>907954</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.">C4082171</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C4082171%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=907954" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=907954" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/237300" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=907954" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox75677" class="ui-helper-hidden-accessible">Select item 75677</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="18" type="checkbox" id="UidCheckBox75677" value="75677" /><span>18.</span></div><div class="rslt"><p class="title"><a href="/medgen/75677" ref="ordinalpos=18&amp;ncbi_uid=75677&amp;link_uid=75677">Infantile hypophosphatasia</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Hypophosphatasia is characterized by defective mineralization of growing or remodeling bone, with or without root-intact tooth loss, in the presence of low activity of serum and bone alkaline phosphatase. Clinical features range from stillbirth without mineralized bone at the severe end to pathologic fractures of the lower extremities in later adulthood at the mild end. While the disease spectrum is a continuum, seven clinical forms of hypophosphatasia are usually recognized based on age at diagnosis and severity of features: Perinatal (severe): Characterized by pulmonary insufficiency and hypercalcemia Perinatal (benign): Prenatal skeletal manifestations that slowly resolve into one of the milder forms Infantile: Onset between birth and age six months of clinical features of rickets without elevated serum alkaline phosphatase activity Severe childhood (juvenile): Variable presenting features progressing to rickets Mild childhood: Low bone mineral density for age, increased risk of fracture, and premature loss of primary teeth with intact roots Adult: Characterized by stress fractures and pseudofractures of the lower extremities in middle age, sometimes associated with early loss of adult dentition Odontohypophosphatasia: Characterized by premature exfoliation of primary teeth and/or severe dental caries without skeletal manifestations [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>75677</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.">C0268412</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0268412%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=75677" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=75677" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/241500" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=75677" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox65086" class="ui-helper-hidden-accessible">Select item 65086</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="19" type="checkbox" id="UidCheckBox65086" value="65086" /><span>19.</span></div><div class="rslt"><p class="title"><a href="/medgen/65086" ref="ordinalpos=19&amp;ncbi_uid=65086&amp;link_uid=65086">Medium-chain acyl-coenzyme A dehydrogenase deficiency</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Individuals with medium-chain acyl-coenzyme A dehydrogenase (MCAD) deficiency typically appear normal at birth, and many are diagnosed through newborn screening programs. Symptomatic individuals experience hypoketotic hypoglycemia in response to either prolonged fasting (e.g., weaning the infant from nighttime feedings) or during intercurrent and common infections (e.g., viral gastrointestinal or upper respiratory tract infections), which typically cause loss of appetite and increased energy requirements when fever is present. Untreated severe hypoglycemic episodes can be accompanied by seizures, <b>vomiting</b>, lethargy, coma, and death. Metabolic decompensation during these episodes can result in elevated liver transaminases and hyperammonemia. Individuals with MCAD deficiency who have experienced the effects of uncontrolled metabolic decompensation are also at risk for chronic myopathy. Early identification and avoidance of prolonged fasting can ameliorate these findings. However, children with MCAD deficiency are at risk for obesity after initiation of treatment due to the frequency of feeding. [from <a title="GeneReviews" href="https://www.ncbi.nlm.nih.gov/books/NBK1116" class="defSource" target="_blank">GeneReviews</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>65086</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.">C0220710</a></dd><dt><span class="dotprefix"></span></dt><dd>Disease or Syndrome</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C0220710%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=65086" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=65086" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/201450" target="_blank">OMIM</a></li>
<li><a href="/pubmed?LinkName=medgen_pubmed_genereviews&amp;from_uid=65086" target="_blank"><i>GeneReviews</i></a></li></ul>
</div></div></div></div><div class="rprt"><div class="rprtnum nohighlight"><label for="UidCheckBox854827" class="ui-helper-hidden-accessible">Select item 854827</label><input name="EntrezSystem2.PEntrez.MedGen.MedGen_ResultsPanel.MedGen_RVDocSum.uid" sid="20" type="checkbox" id="UidCheckBox854827" value="854827" /><span>20.</span></div><div class="rslt"><p class="title"><a href="/medgen/854827" ref="ordinalpos=20&amp;ncbi_uid=854827&amp;link_uid=854827">Hirschsprung disease, susceptibility to, 1</a></p><div class="supp"><p class="rprtbody"><span class="concept-def">Hirschsprung disease can occur in combination with other conditions, such as Waardenburg syndrome, type IV; Mowat-Wilson syndrome; or congenital central hypoventilation syndrome. These cases are described as syndromic. Hirschsprung disease can also occur without other conditions, and these cases are referred to as isolated or nonsyndromic.<br /><br />There are two main types of Hirschsprung disease, known as short-segment disease and long-segment disease, which are defined by the region of the intestine lacking nerve cells. In short-segment disease, nerve cells are missing from only the last segment of the large intestine (colon). This type is most common, occurring in approximately 80 percent of people with Hirschsprung disease. For unknown reasons, short-segment disease is four times more common in men than in women. Long-segment disease occurs when nerve cells are missing from most of the large intestine and is the more severe type. Long-segment disease is found in approximately 20 percent of people with Hirschsprung disease and affects men and women equally. Very rarely, nerve cells are missing from the entire large intestine and sometimes part of the small intestine (total colonic aganglionosis) or from all of the large and small intestine (total intestinal aganglionosis).<br /><br />Enteric nerves trigger the muscle contractions that move stool through the intestine. Without these nerves in parts of the intestine, the material cannot be pushed through, causing severe constipation or complete blockage of the intestine in people with Hirschsprung disease. Other signs and symptoms of this condition include <b>vomiting</b>, abdominal pain or swelling, diarrhea, poor feeding, malnutrition, and slow growth. People with this disorder are at risk of developing more serious conditions such as inflammation of the intestine (enterocolitis) or a hole in the wall of the intestine (intestinal perforation), which can cause serious infection and may be fatal.<br /><br />Hirschsprung disease is an intestinal disorder characterized by the absence of nerves in parts of the intestine. This condition occurs when the nerves in the intestine (enteric nerves) do not form properly during development before birth (embryonic development). This condition is usually identified in the first two months of life, although less severe cases may be diagnosed later in childhood. [from <a title="MedlinePlus Genetics" href="https://medlineplus.gov/genetics/" class="defSource" target="_blank">MedlinePlus Genetics</a>]</span><br /></p><div class="spaceAboveSmall"><div class="aux"><div class="resc"><dl class="rprtid"><dt>MedGen UID: </dt><dd>854827</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.">C3888239</a></dd><dt><span class="dotprefix"></span></dt><dd>Finding</dd></dl></div></div></div><div>
<ul class="db_links"><li><a href="/gtr/tests/?term=C3888239%5bDISCUI%5d" target="_blank">GTR</a></li>
<li><a href="/clinvar?LinkName=medgen_clinvar&amp;from_uid=854827" target="_blank">ClinVar</a></li>
<li><a href="/gene?LinkName=medgen_gene_diseases&amp;from_uid=854827" target="_blank">Genes</a></li>
<li><a href="http://www.omim.org/entry/142623" target="_blank">OMIM</a></li>
<li><span class="inactive"><i>GeneReviews</i></span></li></ul>
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