3-HYDROXY-3-METHYLGLUTARYL COENZYME A LYASE DEFICIENCY.

Abstract
The progress of a child with a defect in leucine metabolism due to a deficiency of 3-hydroxy-3-methylglutaryl coenzyme A lyase activity is reported. This child was reported briefly in 1976 when the abnormality was first suspected, at which time he was 7 mo. old. He is now aged 4 yr 7 mo. and appears to be well and developing satisfactorily. His diet has been difficult to control and the biochemical defect is extremely sensitive to small amounts of leucine in the diet.