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  • Title: Human NADH:ubiquinone oxidoreductase.
    Author: Smeitink J, Sengers R, Trijbels F, van den Heuvel L.
    Journal: J Bioenerg Biomembr; 2001 Jun; 33(3):259-66. PubMed ID: 11695836.
    Abstract:
    NADH:ubiquinone oxidoreductase consists of at least 43 proteins; seven are encoded by the mitochondrial genome, while the remainder are encoded by the nuclear genome. A deficient activity of this enzyme complex is frequently observed in the clinical heterogeneous group of mitochondrial disorders, with Leigh (-like) disease as the main contributor. Enzyme complex activity measurement in skeletal muscle is the mainstay of the diagnostic process. Fibroblast studies are a prerequisite whenever prenatal enzyme diagnosis is considered. Mitochondrial DNA mutations are found in approximately 5-10% of all complex I deficiencies. Recently, all structural nuclear complex I genes have been determined at the cDNA level and several at the gDNA level. A comprehensive mutational analysis study of all complex I nuclear genes in a group of 20 patients exhibiting this deficiency revealed mutations in about 40%. Here, we describe the enzymic methods we use and the recent progress made in genomics and cell biology of human complex I.
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