Mitochondrial trifunctional protein deficiency associated with recurrent myoglobinuria in adolescence

A 23-year-old man with recurrent myoglobinuria had low muscle-free carnitine levels and deficient fasting ketogenesis. Urinary organic acid analysis showed large amounts of C6-C14 3-hydroxydicarboxylic acids. Mitochondrial trifunctional protein (TP), harboring long-chain enoyl-coenzyme A (CoA) hydratase, long-chain 3-hydroxyacyl-CoA dehydrogenase, and long-chain 3-ketoacyl-CoA thiolase showed markedly decreased activity in fibroblasts. On immunoblot analysis, the TP content of his fibroblasts was less than 2% that of the control cells. TP deficiency can be a life-threatening disorder with early infantile onset, but it can also present in adolescence with recurrent myoglobinuria.

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