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Medical Dictionary

maple syrup urine disease

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noun ma·ple syr·up urine disease \ˈmā-pəl-ˈsər-əp-, -ˈsir-əp-\

Medical Definition of maple syrup urine disease

  1. :  an inherited disorder of amino acid metabolism that is characterized initially by an odor of maple syrup in the urine and in earwax and by vomiting, fatigue, irritability, and hypertonicity, and that unless treated with dietary measures leads to seizures, brain damage, coma, and death Maple syrup urine disease is caused by a deficiency of the enzyme decarboxylase, which leads to high concentrations of the amino acids valine, leucine, isoleucine, and alloisoleucine in the blood, urine, and cerebrospinal fluid. The disorder is inherited as an autosomal recessive trait requiring that both parents pass on a copy of the defective gene on a chromosome other than a sex chromosome.




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