Name the genetic disease associated with the lack of the liver enzyme necessary to convert phenylalanine to tyrosine.

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Phenylketonuria, or PKU, is a genetic disease that results from a lack of the liver enzyme phenylalanine hydroxylase, which is necessary to convert phenylalanine to tyrosine. This leads to a build-up of phenylalanine in the body, which can cause cognitive and developmental issues if not managed properly. Maple syrup urine disease (A) is associated with a deficiency in branched-chain alpha-keto acid dehydrogenase, which leads to a buildup of certain amino acids in the body. Homocystinuria (C) is caused by a deficiency in cystathionine beta synthase, which leads to elevated levels of homocysteine in the body. Lactase deficiency (D) results in the body's inability to break down lactose, a sugar found in milk and dairy products.

Name the Genetic Disease Associated with the Lack of the Liver