Abstract
The multiple acyl-coenzyme A (CoA) dehydrogenation disorders (MAD) include severe (S) and mild (M) variants, glutaric aciduria type II (MAD:S) and ethylmalonic-adipic aciduria (MAD:M). Intact MAD:M mitochondria oxidized [1-14C]octanoate, [1-14C]palmityl-CoA, and [1,5-14C]glutarate at 20-46% of control levels; MAD:S mitochondria oxidized these three substrates at 0.4-18% of control levels. In MAD:M mitochondria, acyl-CoA dehydrogenase (ADH) activities were similar to control, whereas MAD:S ADH activities ranged from 38% to 73% of control. Electron transfer flavoprotein (ETF) activities in five MAD:M cell lines ranged from 29 to 51% of control (P less than 0.01); ETF deficiency was the primary enzymatic defect in two MAD:M lines. In four MAD:S patients, ETF activities ranged from 3% to 6% of control (P less than 0.001); flavin adenine dinucleotide addition increased residual ETF activity from 4% to 21% of control in a single MAD:S line (P less than 0.01). Three MAD:S patients had ETF activities ranging from 33 to 53% of control; other investigators found deficient ETF-dehydrogenase activity in these MAD:S and three of our MAD:M cell lines.
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Selected References
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