Definition: an inherited metabolic disorder resulting from a deficiency of propionyl-CoA carboxylase PCC, the enzyme that converts propionate to methylmalonate and with biotin as a cofactor; caused by a mutation in the gene PCCA encoding propionyl-CoA on 13q or PCCB on 3q; the clinical features are episodic vomiting and lethargy with hyperammonemia, hyperglycinemia, and ketoacidosis; death may occur following seizures and coma.
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