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RETRACTED: Darwinian selection on a selfing locus.

Kentaro K Shimizu1, Jennifer M Cork, Ana L Caicedo

  • 1Department of Genetics, North Carolina State University, Box 7614, Raleigh, NC 27695, USA.

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Summary
This summary is machine-generated.

The evolution of self-pollination in Arabidopsis thaliana was driven by pseudogenes at self-incompatibility loci, leading to reduced genetic variation. This recent adaptive event may be linked to the plant

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Area of Science:

  • Evolutionary biology
  • Plant genetics
  • Molecular evolution

Background:

  • Self-pollination is a common evolutionary transition in flowering plants.
  • In Arabidopsis thaliana, pseudogenes at the Self-Compatibility Receptor (SCR) and Self-Incompatibility Locus Receptor Kinase (SRK) loci are implicated in the evolution of self-fertilization.
  • Reduced nucleotide variation is observed in pseudogene alleles of SCR due to positive directional selection.

Purpose of the Study:

  • To investigate the evolutionary mechanisms driving the transition to self-pollination in Arabidopsis thaliana.
  • To determine the role of pseudogenes at SCR and SRK loci in the evolution of self-fertilization.
  • To explore the timing and potential ecological associations of this adaptive event.

Main Methods:

  • Analysis of pseudogene alleles at SCR and SRK self-incompatibility loci.
  • Identification of positive directional selection acting on SCR pseudogene alleles.
  • Coalescent simulations to infer the timing of the adaptive event and its association with post-Pleistocene expansion.

Main Results:

  • Positive directional selection has led to the evolutionary fixation of pseudogene alleles of SCR.
  • This fixation has resulted in substantially reduced nucleotide variation at these loci.
  • Coalescent simulations suggest the adaptive event is recent and potentially linked to the post-Pleistocene expansion of Arabidopsis thaliana.

Conclusions:

  • The evolution of self-pollination in Arabidopsis thaliana is associated with the fixation of pseudogene alleles at SCR and SRK loci.
  • This transition, driven by positive selection, has significantly reduced genetic diversity.
  • Ancillary morphological innovations related to self-pollination may evolve rapidly following the loss of self-incompatibility.