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Related Experiment Videos

Is there selection on RFLP differences in mitochondrial DNA?

L Nigro1, T Prout

  • 1Dipartemento di Biologia, Universitá degli studi di Padova, Italia.

Genetics
|July 1, 1990
PubMed
Summary

Selection on mitochondrial DNA (mtDNA) was investigated in Drosophila simulans. Rickettsia infection, not mtDNA selection, explained population changes, ruling out previous hypotheses.

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Area of Science:

  • * Evolutionary biology
  • * Genetics
  • * Microbiology

Background:

  • * Investigating selection pressures on mitochondrial DNA (mtDNA) in experimental populations.
  • * Drosophila simulans populations were found to differ in Rickettsia-mediated incompatibility systems.
  • * These Rickettsia systems are maternally transmitted alongside mtDNA.

Purpose of the Study:

  • * To detect the presence or absence of selection on mitochondrial DNA (mtDNA) restriction fragment length polymorphism.
  • * To determine if Rickettsia infection or mtDNA selection drives population dynamics.
  • * To evaluate previous hypotheses on mtDNA changes in Drosophila populations.

Main Methods:

  • * Establishment of experimental Drosophila simulans populations.
  • * Characterization of Rickettsia-mediated incompatibility systems in founding strains.
  • * Construction of a population model incorporating Rickettsia fitness effects.

Main Results:

  • * Population trajectories were fully explained by Rickettsia infection effects.
  • * No evidence for selection on mtDNA was required to explain observed population changes.
  • * The study ruled out strong selection as an explanation for dramatic mtDNA changes in related species.

Conclusions:

  • * Rickettsia infection, not selection on mtDNA, is the primary driver of population dynamics in this context.
  • * Previous explanations for significant mtDNA changes in Drosophila populations are challenged.
  • * The spread or decline of Rickettsia infection in natural populations may be unbiased.

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