NEONATAL CARNITINE PALMITOYLTRANSFERASE-2 DEFICIENCY - A CASE PRESENTING WITH MYOPATHY

Mitochondria were isolated from liver, heart and skeletal muscle of a 34-day-old female infant who died from a myopathic illness. Muscle bio psy showed lipid accumulation and no obvious pathology in any other or gan. Enzymatic analysis of skeletal muscle extracts revealed normal ac tivities of the markers pyruvate dehydrogenase and citrate synthase. M alonyl-CoA-sensitive carnitine palmitoyltransferase (CP1,) was detecte d but malonyl-CoA-insensitive carnitine palmitoyltransferase (CPT2) ap peared to be absent. Quantitative immunoblotting revealed the presence of a normal abundance of CPT2 protein in the patient's muscle. It is concluded that enzymically inactive CPT2 protein was present.