Deficiency of the enzymes of mitochondrial fatty acid oxidation and related carnitine dependent steps have been shown to be one of the causes of the fasting-induced hypoketotic hypoglycemia. We describe here carnitine-acylcarnitine translocase deficiency in a neonate who died eight days after birth. The proband showed severe fasting-induced hypoketotic hypoglycemia, high plasma creatine kinase, heartbeat disorder, hypothermia, and hyperammonemia. The plasma-free carnitine on day three was only 3 microM, and 92% of the total carnitine (37 microM) was present as acylcarnitine. Treatments with intravenous glucose, carnitine, and medium-chain triglycerides had been tried without improvements. Measurements in fibroblasts confirmed deficient oxidation of palmitate and showed normal activities of the carnitine palmitoyltransferases I and II and of the three acyl-CoA dehydrogenases. A total deficiency of the carnitine-acyl-carnitine translocase was found in fibroblasts using the carnitine acetylation assay (1986. Biochem. J. 236:143-148). This assay has been further simplified by seeking conditions permitting application to permeabilized fibroblasts and lymphocytes.
S V Pande, M Brivet, A Slama, F Demaugre, C Aufrant, J M Saudubray
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Functional Analysis of Mutant Human Carnitine Acylcarnitine Translocases in Yeast
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Carnitine-acylcarnitine translocase deficiency is a treatable disease
AI Aqeel, MS Rashed, RJ Wanders |
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GENETIC DISORDERS OF CARNITINE METABOLISM AND THEIR NUTRITIONAL MANAGEMENT1
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Principles of Perinatal—Neonatal Metabolism
RM Cowett |
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Cloning of the Human Carnitine-Acylcarnitine Carrier cDNA and Identification of the Molecular Defect in a Patient
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1997 | |
Carnitine-acylcarnitine translocase deficiency - a mild phenotype
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