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2","evidence":"TAS","frequency_raw":"HP:0040282","hpo_id":"HP:0000639","is_excluded":false,"label":"Nystagmus","onset_id":null,"reference":"ORPHA:28378","source_release":"2026-06-23"},"sourceGroups":["orphanet"]}],"referenceLabels":{},"references":{"causeHtml":"<ul><li><a href=\"https://medlineplus.gov/genetics/condition/tyrosinemia\">Tyrosinemia</a></li></ul>","identityNote":"MONDO cross-references identify native condition entries. Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>Variants (also called mutations) in the FAH, TAT, and HPD genes can cause tyrosinemia types I, II, and III, respectively.</p><p>In the liver, specialized proteins called enzymes break down tyrosine in a five-step process. The resulting molecules are either removed from the body by the kidneys or used in the body to produce energy or make other substances.</p><p>The FAH gene provides instructions for making an enzyme called fumarylacetoacetate hydrolase, which performs the last step of tyrosine breakdown. The enzyme produced from the TAT gene, called tyrosine aminotransferase enzyme, is involved in the first step in the process. The HPD gene provides instructions for making the 4-hydroxyphenylpyruvate dioxygenase enzyme, which performs the second step.</p><p>Variants in the FAH, TAT, or HPD gene reduce the activity of one of the enzymes that break down tyrosine. As a result, tyrosine and its byproducts accumulate to toxic levels, which can damage and kill cells in the liver, kidneys, nervous system, and other organs.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/tyrosinemia/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Tyrosinemia?"},{"bodyHtml":"<p>There are three types of tyrosinemia, distinguished by their symptoms and genetic cause. Tyrosinemia type I is the most severe form of this disorder and usually begins in the first few months of life. Affected infants do not gain weight and grow at the expected rate (failure to thrive) because eating high-protein foods leads to diarrhea and vomiting. Affected infants may also have yellowing of the skin and whites of the eyes (jaundice), a cabbage-like odor, and an increased tendency to bleed (particularly nosebleeds).</p><p>In addition, tyrosinemia type I can lead to liver and kidney failure, softening and weakening of the bones (rickets), and an increased risk of liver cancer (hepatocellular carcinoma). Some affected children have repeated neurologic crises that consist of changes in their mental state, reduced sensation in the arms and legs (peripheral neuropathy), abdominal pain, and serious breathing problems (respiratory failure). These crises can last from 1 to 7 days. Without treatment, children with tyrosinemia type I often do not survive past the age of 10. With early diagnosis and treatment, though, affected individuals can live into adulthood.</p><p>Tyrosinemia type II often begins in early childhood and affects the eyes, skin, and mental development. Signs and symptoms include eye pain and redness, excessive tearing, abnormal sensitivity to light (photophobia), and thick, painful skin on the palms of the hands and soles of the feet (palmoplantar hyperkeratosis). About half of individuals with tyrosinemia type II have some degree of intellectual disability.</p><p>Tyrosinemia type III is the rarest of the three types. The characteristic features of this type include intellectual disabilities, seizures, and periodic loss of balance and coordination (intermittent ataxia). Liver problems do not occur in types II and III.</p><p>About 1 in 10 of all newborns have temporarily elevated levels of tyrosine (transient tyrosinemia). These cases are not genetic. The most likely causes are vitamin C deficiency or an immature liver due to premature birth.</p><p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/tyrosinemia\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"tyrosinemia","sourceDocuments":[{"name":"Tyrosinemia","reviewed":"2023-06","sections":{"causes":{"fetchedAt":"2026-10-20T20:25:38.545785+00:00","label":"Causes","pageSha256":"460dd589324e9cfb3036142013fd2e70d4b5e19d55f4e2c4bc12c5b3474c7f6e","sourceUrl":"https://medlineplus.gov/genetics/condition/tyrosinemia/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/tyrosinemia"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. Feature values below retain their original sources and patient groups.","title":"Tyrosinemia"},"schemaVersion":1}