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  • An inherited disorder of leucine metabolism with characteristics of a highly variable clinical picture ranging from metabolic crisis in infancy to asymptomatic adults. Patients have a variable clinical phenotype with the vast majority of patients being asymptomatic and a small subgroup displaying symptoms of an organic aciduria, usually in association with environmental triggering factors. This disease is due to mutations in the MCCC1 (3q27.1) or MCCC2 (5q12-q13) genes. Mutations in these genes lead to reduced or absent 3-MCC activity, thereby allowing the toxic byproducts of leucine processing to build up and cause clinical symptoms. Inherited autosomal recessively.
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