Comparative analysis of mitochondrial genotype and aging

J. William O. Ballard, Subhash D. Katewa, Richard G. Melvin, Grace Chan, Bill Ballard

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

A common feature across all animals, including humans, is that mitochondrial bioenergetics is linked to oxidative stress, but the nature of these relationships with survival is yet to be properly defined. In this study we included 12 Drosophila simulans isofemale lines: four of each distinct mtDNA haplogroup (siI, -II, and -III). First, we investigated sequence variation in six mtDNA and 13 nuclear encoded genes (nine nuclear-encoded subunits, and the four known isoforms, of complex IV of the electron transport chain). As expected we observed high divergence among the three distinct mitotypes and greatest mtDNA variability in siII-harboring flies. In the nuclear encoded genes, no fixed amino acid differences were observed and levels of polymorphism did not differ significantly among flies harboring distinct mtDNA types. Second, 15,456 flieswere included in mortality studies. We observed that mtDNA type influenced survival (siII ≈ siIII > siI), flies harboring siII mtDNA had the greatest variation in mortality rates, and in all cases males were longer lived than females. We also assayed maximal rates of hydrogen peroxide (H2O 2) production from complex III of the electron transport chain in mitochondria isolated from 11-day-old flies. Contrary to our prediction, rates of H2O2 production tended to increase with mean survival. This result suggests that higher rates of H2O2 production in younger flies may lead to an upregulation of antioxidants, age-dependent increase in the rate of H2O2 production differ, and/or flies vary in their mitochondrial uncoupling. Alternatively, the whole organism may not regularly, if ever, experience maximal H2O2 production rates.

Original languageEnglish (US)
Title of host publicationHealthy Aging and Longevity
Subtitle of host publicationThird International Conference
PublisherBlackwell Publishing Inc
Pages93-106
Number of pages14
ISBN (Print)1573316806, 9781573316804
DOIs
StatePublished - Oct 2007
Externally publishedYes

Publication series

NameAnnals of the New York Academy of Sciences
Volume1114
ISSN (Print)0077-8923
ISSN (Electronic)1749-6632

Keywords

  • Aging
  • Drosophila
  • Evolution
  • Free radicals
  • Longevity
  • Mitochondria

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    Ballard, J. W. O., Katewa, S. D., Melvin, R. G., Chan, G., & Ballard, B. (2007). Comparative analysis of mitochondrial genotype and aging. In Healthy Aging and Longevity: Third International Conference (pp. 93-106). (Annals of the New York Academy of Sciences; Vol. 1114). Blackwell Publishing Inc. https://doi.org/10.1196/annals.1396.011