title: Nuclear but not mitochondrial DNA involvement in respiratory complex I defects found in senescence-accelerated mouse strain, SAMP8.
abstract: This study determined pathogenicity of an A11181G mtDNA mutation found in a senescence-accelerated mouse strain, SAMP8. The mutation was at a highly conserved site of the mt-Nd4 gene, which encodes one of the respiratory complex I subunits. The young SAMP8 expressed reduced complex I activity, which is controlled by both nuclear and mitochondrial DNA (mtDNA). To exclude the nuclear effects, we isolated transmitochondrial cybrids that share the same nuclear background, but possess mtDNA with or without the mutation. The cybrids showed normal respiratory function irrespective of whether their mtDNA possessed the mutation or not, suggesting that the A11181G mutation is not responsible for respiration defects found in SAMP8.
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1–1–1 Tennohdai, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Hirotake
authors.initials: H
authors.lastname: Imanishi
authors.forename: Mutsumi
authors.initials: M
authors.lastname: Yokota
authors.forename: Masayuki
authors.initials: M
authors.lastname: Mori
authors.forename: Akinori
authors.initials: A
authors.lastname: Shimizu
authors.forename: Kazuto
authors.initials: K
authors.lastname: Nakada
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Hayashi
mesh_terms: D000375:Aging; D019943:Amino Acid Substitution; D000818:Animals; D002467:Cell Nucleus / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D019069:Cell Respiration / Q000235:genetics; D004272:DNA, Mitochondrial / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D042967:Electron Transport Complex I / Q000235:genetics* / Q000378:metabolism; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009245:NADH Dehydrogenase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D053652:Nuclear Transfer Techniques; D016415:Sequence Alignment
chemical_list: D004272:DNA, Mitochondrial; C098483:NADH dehydrogenase subunit 4; D009245:NADH Dehydrogenase; D042967:Electron Transport Complex I