Cited by 206Mitochondrial Function and PathologyMuscle Physiology and DisordersCoenzyme Q10 studies and effects

Ageing muscle: clonal expansions of mitochondrial DNA point mutations and deletions cause focal impairment of mitochondrial function

Fayet, Guillemette, Jansson, Monica, Sternberg, Damien, Moslemi, Ali-Reza, Blondy, Patricia, Lombès, Anne, Fardeau, Michel, Oldfors, Anders·2002·Neuromuscular Disorders

Abstract

Although mitochondrial DNA deletions have been shown to accumulate in cytochrome c oxidase deficient muscle fibres of ageing muscle, this has not been demonstrated for point mutations. In this study, we investigated the occurrence of mitochondrial DNA alterations (point mutations and deletions) in cytochrome c oxidase deficient muscle fibres from 14 individuals, without muscle disease, aged 69-82 years. Immunohistochemical investigation showed that the majority of the cytochrome c oxidase deficient muscle fibres expressed reduced levels of subunit II of cytochrome c oxidase, which is encoded by mitochondrial DNA, whereas there was normal or increased expression of subunit IV of cytochrome c oxidase, which is encoded by nuclear DNA. This pattern is typical for mitochondrial DNA mutations causing impaired mitochondrial translation. Single muscle fibres (109 cytochrome c oxidase deficient and 109 normal fibres) were dissected and their DNA extracted. Mitochondrial DNA point mutations were searched for in five tRNA genes by denaturing gradient gel electrophoresis while deletions were looked for by polymerase chain reaction amplification. High levels of clonally expanded point mutations were identified in eight cytochrome c oxidase deficient fibres but in none of the normal ones. They included the previously described pathogenic tRNALeu(UUR)A3243G and tRNALysA8344G mutations and three original mutations: tRNAMetT4460C, tRNAMetG4421A, and a 3-bp deletion in the tRNALeu(UUR) gene. Four different large-scale mitochondrial DNA deletions were identified in seven cytochrome c oxidase deficient fibres and in one of the normal ones. There was no evidence of depletion of mitochondrial DNA by in situ hybridisation experiments. Our data show that mitochondrial DNA point mutations, as well as large-scale deletions, are associated with cytochrome c oxidase deficient muscle fibre segments in ageing. Their focal accumulation causes significant impairment of mitochondrial function in individual cells in spite of low overall levels of mitochondrial DNA mutations in muscle.

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Crossref · 10.1016/s0960-8966(01)00332-7

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  • Accumulations of mtDNA damage in the form of point mutations, deletions and depletions are correlated with aging and age-related diseases as observed in human skeletal muscle, liver, brain, heart, skin fibroblasts and colonic crypt stem cells.

    “Accumulations of mtDNA damage in the form of point mutations, deletions and depletions are correlated with aging and age-related diseases as observed in human skeletal muscle (Bua et al., 2006; Fayet et al., 2002), liver (Yen et al., 1991), brain (Corral-Debrinski et al., 1992a; Corral-Debrinski et al., 1994; Lin et al., 2002), heart (Corral-Debrinski et al., 1992b; Cortopassi and Arnheim, 1990),”
  • Clonal expansion of mtDNA mutations has been described in numerous tissues from aged individuals, including skeletal muscle, substantia nigra neurons, heart and colonic crypts.

    “Clonal expansion of mtDNA mutations has been described in numerous tissues from aged individuals, such as skeletal muscle (Fayet et al., 2002; Muller-Hocker et al., 1993), substantia nigra neurons (Cottrell et al., 2001; Kraytsberg et al., 2006), heart (Muller-Hocker, 1989) and colonic crypts (Taylor et al., 2003).”

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Authors
Fayet, G., Jansson, M., Sternberg, D., Moslemi, A.-R., Blondy, P., Lombès, A., Fardeau, M., & Oldfors, A.
Affiliations
  • Inserm (FR)
  • Sahlgrenska University Hospital (SE)
  • Laboratoire de Biochimie (FR)
Venue
Neuromuscular Disorders
Publisher
Elsevier BV
Published
2002-06
Volume
12
Issue
5
Pages
484-493
ISSN
0960-8966 (ISSN-L)
OpenAlex
W2036988144
Cited by
206
References
43
Citations by year
2026: 1 · 2025: 4 · 2024: 8 · 2023: 5 · 2022: 11 · 2021: 7 · 2020: 12 · 2019: 4 · 2018: 14 · 2017: 4 · 2016: 7 · 2015: 8 · 2014: 11 · 2013: 10 · 2012: 9
FWCI
3.47
Type
journal article
Language
en
Open access
closed
Locations
  • Neuromuscular Disorders (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Fondation pour la Recherche Médicale
  • Reumatikerförbundet
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Coenzyme Q10 studies and effects
Keywords
mitochondrial DNA mutations, mitochondrial DNA deletions, cytochrome c oxidase deficiency, clonal expansion, cytochrome c oxidase subunit II, mitochondrial function, skeletal muscle fibers
MeSH terms
Aged, Aged, 80 and over, Aging, Base Sequence, Electron Transport Complex IV, DNA, Mitochondrial, Female, Humans, Isoenzymes, Male, Mitochondria, Muscle, Gene Deletion, Point Mutation, Muscle, Skeletal, Muscle Fibers, Skeletal, Mitochondrial Diseases, Cytochrome-c Oxidase Deficiency

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