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Polymorphisms in the mitochondrial DNA control region and frailty in older adults.
Tuesday,2012-11-06 12:19 America/Los_Angeles — eenright
| Title | Polymorphisms in the mitochondrial DNA control region and frailty in older adults. |
| Publication Type | Journal Article |
| Year of Publication | 2010 |
| Authors | Moore, AZ, Biggs, ML, Matteini, A, O'Connor, A, McGuire, S, Beamer, BA, M Fallin, D, Fried, LP, Walston, J, Chakravarti, A, Arking, DE |
| Journal | PLoS One |
| Volume | 5 |
| Issue | 6 |
| Pagination | e11069 |
| Date Published | 2010 Jun 10 |
| ISSN | 1932-6203 |
| Keywords | Aged, Aged, 80 and over, DNA, Mitochondrial, Female, Frail Elderly, Genotype, Humans, Male, Polymorphism, Genetic |
| Abstract | <p><b>BACKGROUND: </b>Mitochondria contribute to the dynamics of cellular metabolism, the production of reactive oxygen species, and apoptotic pathways. Consequently, mitochondrial function has been hypothesized to influence functional decline and vulnerability to disease in later life. Mitochondrial genetic variation may contribute to altered susceptibility to the frailty syndrome in older adults.</p><p><b>METHODOLOGY/PRINCIPAL FINDINGS: </b>To assess potential mitochondrial genetic contributions to the likelihood of frailty, mitochondrial DNA (mtDNA) variation was compared in frail and non-frail older adults. Associations of selected SNPs with a muscle strength phenotype were also explored. Participants were selected from the Cardiovascular Health Study (CHS), a population-based observational study (1989-1990, 1992-1993). At baseline, frailty was identified as the presence of three or more of five indicators (weakness, slowness, shrinking, low physical activity, and exhaustion). mtDNA variation was assessed in a pilot study, including 315 individuals selected as extremes of the frailty phenotype, using an oligonucleotide sequencing microarray based on the Revised Cambridge Reference Sequence. Three mtDNA SNPs were statistically significantly associated with frailty across all pilot participants or in sex-stratified comparisons: mt146, mt204, and mt228. In addition to pilot participants, 4,459 additional men and women with frailty classifications, and an overlapping subset of 4,453 individuals with grip strength measurements, were included in the study population genotyped at mt204 and mt228. In the study population, the mt204 C allele was associated with greater likelihood of frailty (adjusted odds ratio = 2.04, 95% CI = 1.07-3.60, p = 0.020) and lower grip strength (adjusted coefficient = -2.04, 95% CI = -3.33- -0.74, p = 0.002).</p><p><b>CONCLUSIONS: </b>This study supports a role for mitochondrial genetic variation in the frailty syndrome and later life muscle strength, demonstrating the importance of the mitochondrial genome in complex geriatric phenotypes.</p> |
| DOI | 10.1371/journal.pone.0011069 |
| Alternate Journal | PLoS ONE |
| PubMed ID | 20548781 |
| PubMed Central ID | PMC2883558 |
| Grant List | U01 HL080295 / HL / NHLBI NIH HHS / United States N01 HC015103 / HC / NHLBI NIH HHS / United States P30 AG021334 / AG / NIA NIH HHS / United States N01HC55222 / HL / NHLBI NIH HHS / United States N01-HC-85086 / HC / NHLBI NIH HHS / United States N01HC85086 / HL / NHLBI NIH HHS / United States N01 HC-55222 / HC / NHLBI NIH HHS / United States N01-HC-75150 / HC / NHLBI NIH HHS / United States N01HC75150 / HL / NHLBI NIH HHS / United States N01-HC-85079 / HC / NHLBI NIH HHS / United States N01HC85079 / HL / NHLBI NIH HHS / United States N01 HC045133 / HC / NHLBI NIH HHS / United States N01 HC035129 / HC / NHLBI NIH HHS / United States |