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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Deficiency of the reduced nicotinamide adenine dinucleotide dehydrogenase component of complex I of mitochondrial electron transport. Fatal infantile lactic acidosis and hypermetabolism with skeletal-cardiac myopathy and encephalopathy.

A mitochondrial defect was investigated in an infant with fatal congenital lactic acidosis (3-14 mM), high lactate-to-pyruvate ratio, hypotonia, and cardiomyopathy. His sister had died with a similar disorder. Resting oxygen consumption was 150% of controls. Pathological findings included increased numbers of skeletal muscle mitochondria (many with proliferated, concentric cristae), cardiomegaly, fatty infiltration of the viscera, and spongy encephalopathy. Mitochondria from liver and muscle biopsies oxidized NADH-linked substrates at rates 20-50% of controls, whereas succinate oxidation by muscle mitochondria was increased. Mitochondrial NADH dehydrogenase activity (complex I, assayed as rotenone-sensitive NADH oxidase, NADH-duroquinone reductase, and NADH-cytochrome c reductase) was 0-10% of controls, and NADH-ferricyanide reductase activity was 25-50% of controls in the mitochondria and in skin fibroblasts. Activities of other electron transport complexes and related enzymes were normal. Familial deficiency of a component of mitochondrial NADH dehydrogenase (complex I) proximal to the rotenone-sensitive site thus accounts for this disorder.[1]


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