Role of mitochondrial DNA mutations in human aging: implications for the central nervous system and muscle - PubMed

Role of mitochondrial DNA mutations in human aging: implications for the central nervous system and muscle

E J Brierley et al. Ann Neurol. 1998 Feb.

Abstract

It has been proposed that one mechanism for nerve and muscle dysfunction with age involves the mitochondria. Mitochondria contain the only DNA outside the nucleus in mammalian cells. Mitochondrial DNA (mtDNA) has a high mutation rate, and low levels of pathogenic mutations have been found in tissues from elderly subjects. However, the role of these mutations in the aging process is uncertain unless a mechanism can be identified that would lead to a biochemical defect. In muscle tissue from normal elderly subjects we show that there are muscle fibers with very low activity of cytochrome c oxidase, suggestive of a mtDNA defect. In these cytochrome c oxidase-deficient fibers we have found very high levels of mutant mtDNA. In addition, different mtDNA mutations are present in different fibers, which explains why there is a low overall incidence of an individual mutation in tissues from elderly subjects. These studies show a direct age-related correlation between a biochemical and genetic defect in normal human tissues and that mtDNA abnormalities are involved in the aging process in human muscle.

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