title: Mouse coq7/clk-1 orthologue rescued slowed rhythmic behavior and extended life span of clk-1 longevity mutant in Caenorhabditis elegans.
abstract: The coq7/clk-1 gene was isolated from the long-lived mutant of Caenorhabditis elegans and was suggested to play a regulatory role in biological rhythm and longevity. The mouse COQ7 is homologous to Saccharomyces cerevisiae COQ7/CAT5 that is required for the biosynthesis of coenzyme Q (ubiquinone), an essential messenger in mitochondrial respiration. In the present study, we characterized the expression and processing of mouse COQ7. We found that COQ7 is highly expressed in tissues with high energy demand such as heart, muscle, liver, and kidney in mice. Biochemical analysis revealed that COQ7 is targeted to mitochondria where it is processed to mature form. Transgenic expression of mouse coq7 completely rescued the slowed rhythmic behaviors of clk-1 such as defecation. In life-span analysis, transgenic expression reverted the extended life span of clk-1 to the comparable level with wild-type control. These data strongly suggested that coq7 plays a pivotal role in the regulation of biological rhythms and the determination of life span in mammalian species.
authors.affiliation: Department of Molecular Genetics, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo, 173-0015, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Takahashi
authors.forename: S
authors.initials: S
authors.lastname: Asaumi
authors.forename: S
authors.initials: S
authors.lastname: Honda
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
authors.forename: D
authors.initials: D
authors.lastname: Nakai
authors.forename: H
authors.initials: H
authors.lastname: Kuroyanagi
authors.forename: T
authors.initials: T
authors.lastname: Shimizu
authors.forename: Y
authors.initials: Y
authors.lastname: Honda
authors.forename: T
authors.initials: T
authors.lastname: Shirasawa
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D030801:Animals, Genetically Modified; D001483:Base Sequence; D019556:COS Cells; D017173:Caenorhabditis elegans / Q000502:physiology*; D029742:Caenorhabditis elegans Proteins; D015801:Helminth Proteins / Q000235:genetics; D008136:Longevity; D051379:Mice; D008928:Mitochondria / Q000737:chemistry; D008969:Molecular Sequence Data; D009154:Mutation; D010507:Periodicity; D011506:Proteins / Q000235:genetics* / Q000502:physiology*; D015996:Survival Rate; D014018:Tissue Distribution
chemical_list: C104339:CLK-1 protein, C elegans; D029742:Caenorhabditis elegans Proteins; D015801:Helminth Proteins; D011506:Proteins