RT Journal Article SR Electronic T1 Carnitine palmityl transferase I deficiency JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 1025 OP 1029 VO 22 IS 11 A1 Aida I. Al-Aqeel A1 Mohammed S. Rashed A1 Jos P. Ruiter A1 Hussa F. Al-Husseini A1 Mohammed S. Al-Amoudi A1 Ronald J. Wanders YR 2001 UL http://smj.org.sa/content/22/11/1025.abstract AB Carnitine palmityl transferase I is the key enzyme in the carnitine dependent transport of long chain fatty acids across the mitochondrial inner membrane and its deficiency results in a decrease rate of fatty acids beta-oxidation with decreased energy production. We reported a family of 3 affected siblings who are the product of a first degree cousin marriage. The first 2 presented with typical Reye-like syndrome with unconsciousness, hepatomegaly, hypoglycemia, hyperammonemia and very high liver enzymes. Liver biopsy showed steatosis. On screening of the complete family, the 3rd sibling was found to have hepatomegaly. The 3 siblings showed an acyl carnitine profile with very high free carnitine with almost absent long chain acyl carnitines, suggestive of carnitine palmityl transferase I deficiency. This was confirmed by enzyme analyses in fibroblast cultures. These patients were effectively treated with a diet high in carbohydrate, low in long chain fatty acids with medium chain triglycerides. In conclusion, carnitine palmityl transferase I deficiency is an important cause of Reye-like syndrome, which may be treated easily with very good results if detected early in life.