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Megan A M Kutzer1, Beth Cornish1, Michael Jamieson1

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Immune response costs vary based on mitochondrial genetics. Fruit flies with different mitochondrial types showed unique trade-offs between immunity, lifespan, and activity, highlighting mitochondria's role in immune costs.

Keywords:
costs of immunityhost–parasite interactioninsectslife history evolutionmitochondriatrade-offs

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Area of Science:

  • Evolutionary biology
  • Immunology
  • Genetics

Background:

  • Organismal survival relies on effective immune responses.
  • Immune defense can incur fitness costs due to resource allocation trade-offs.
  • The influence of mitochondria on these immune costs is not well understood.

Purpose of the Study:

  • To investigate the role of mitochondrial variation in the costs associated with immune stimulation.
  • To determine if different mitochondrial genotypes (mitotypes) affect the fitness consequences of immune activation.

Main Methods:

  • Utilized Drosophila melanogaster cybrid lines with nine distinct mitotypes on a single nuclear background.
  • Exposed female flies to heat-killed bacteria to stimulate immunity or a sterile control.
  • Measured lifespan, fecundity, and locomotor activity to assess fitness costs.

Main Results:

  • Observed significant mitotype-specific costs of immune stimulation.
  • Identified a positive genetic correlation between lifespan and time spent moving.
  • Demonstrated that the costs of immunity are influenced by the mitochondrial genome.

Conclusions:

  • Mitochondrial variation plays a crucial role in modulating the fitness costs of immune responses.
  • These findings add to the understanding of host-pathogen interactions and the genetic basis of immunity.