Mitochondrial dysfunction and infection generate immunity–Fecundity tradeoffs in Drosophila

Justin L. Buchanan, Colin D. Meiklejohn, Kristi L. Montooth

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Physiological responses to short-term environmental stressors, such as infection, can have long-term consequences for fitness, particularly if the responses are inappropriate or nutrient resources are limited. Genetic variation affecting energy acquisition, storage, and usage can limit cellular energy availability and may influence resource-allocation tradeoffs even when environmental nutrients are plentiful. Here, we utilized Drosophila mitochondrial–nuclear genotypes to test whether disrupted mitochondrial function interferes with nutrient-sensing pathways, and whether this disruption has consequences for tradeoffs between immunity and fecundity. We found that an energetically-compromised genotype was relatively resistant to rapamycin—a drug that targets nutrient-sensing pathways and mimics resource limitation. Dietary resource limitation decreased survival of energetically-compromised flies. Furthermore, survival of infection with a natural pathogen was decreased in this genotype, and females of this genotype experienced immunity–fecundity tradeoffs that were not evident in genotypic controls with normal energy metabolism. Together, these results suggest that this genotype may have little excess energetic capacity and fewer cellular nutrients, even when environmental nutrients are not limiting. Genetic variation in energy metabolism may therefore act to limit the resources available for allocation to life-history traits in ways that generate tradeoffs even when environmental resources are not limiting.

Original languageEnglish (US)
Pages (from-to)591-603
Number of pages13
JournalIntegrative and Comparative Biology
Volume58
Issue number3
DOIs
StatePublished - Jan 1 2018

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ASJC Scopus subject areas

  • Animal Science and Zoology
  • Plant Science

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