Wolff 2016 J Evol Biol
|Wolff JN, Pichaud N, Camus MF, Côté G, Blier PU, Dowling DK (2016) Evolutionary implications of mitochondrial genetic variation: mitochondrial genetic effects on OXPHOS respiration and mitochondrial quantity change with age and sex in fruit flies. J Evol Biol 29:736-47.|
Abstract: The ancient acquisition of the mitochondrion into the ancestor of modern-day eukaryotes is thought to have been pivotal in facilitating the evolution of complex life. Mitochondria retain their own diminutive genome, with mitochondrial genes encoding core subunits involved in oxidative phosphorylation. Traditionally, it was assumed there was little scope for genetic variation to accumulate and be maintained within the mitochondrial genome. However, in the past decade, mitochondrial genetic variation has been routinely tied to the expression of life-history traits such as fertility, development, and longevity. To examine whether these broad-scale effects on life-history trait expression might ultimately find their root in mitochondrially-mediated effects on core bioenergetic function, we measured the effects of genetic variation across twelve different mitochondrial haplotypes on respiratory capacity and mitochondrial quantity in the fruit fly, Drosophila melanogaster. We used strains of flies that differed only in their mitochondrial haplotype, and tested each sex separately at two different adult ages. Mitochondrial haplotypes affected both respiratory capacity and mitochondrial quantity. However, these effects were highly context-dependent, with the genetic effects contingent on both the sex and the age of the flies. These sex- and age-specific genetic effects are likely to resonate across the entire organismal life-history, providing insights into how mitochondrial genetic variation may contribute to sex-specific trajectories of life-history evolution. This article is protected by copyright. All rights reserved.
• Keywords: Mitonuclear, Mother's curse, Genome conflict, mtDNA, Sexual conflict
Labels: MiParea: Respiration, mtDNA;mt-genetics, Genetic knockout;overexpression, Gender Pathology: Aging;senescence
Organism: Drosophila Tissue;cell: Skeletal muscle Preparation: Permeabilized tissue
Coupling state: LEAK, OXPHOS, ET Pathway: N, Gp, CIV, Other combinations, ROX HRR: Oxygraph-2k