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Partial Selfing Can Reduce Genetic Loads While Maintaining Diversity During Experimental Evolution.

Ivo M Chelo1,2, Bruno Afonso3,4, Sara Carvalho3

  • 1Instituto Gulbenkian de Ciência, Apartado 14, P-2781-901 Oeiras, Portugal immchelo@fc.ul.pt teotonio@biologie.ens.fr.

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Summary
This summary is machine-generated.

Partial selfing in populations, though unstable, can reduce inbreeding depression and maintain genetic diversity. This reproductive strategy aids adaptation by balancing the purging of deleterious alleles with the preservation of beneficial genetic variation.

Keywords:
C. elegansDisequilibriumEvolve & ResequenceOverdominanceSelf-fertilization

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Genomics

Background:

  • Partial selfing, a mix of self and cross-fertilization, is evolutionarily unstable but observed in nature.
  • This mode may balance purging genetic load with maintaining adaptive genetic diversity.

Purpose of the Study:

  • To investigate the evolutionary stability and adaptive potential of partial selfing.
  • To compare genetic load and diversity under partial selfing, exclusive selfing, and predominant outcrossing.

Main Methods:

  • Experimental evolution of *Caenorhabditis elegans* populations.
  • Adaptation to osmotic stress.
  • Analysis of genome-wide single-nucleotide polymorphisms (SNPs) and inbreeding depression.

Main Results:

  • Genetic load was reduced in partial and exclusive selfing but maintained in predominant outcrossing.
  • Populations under partial selfing and predominant outcrossing retained higher genetic diversity than expected.
  • Deleterious alleles and overdominant loci may explain maintained diversity.

Conclusions:

  • Partial selfing can reduce genetic load while preserving crucial genetic diversity for adaptation.
  • This mode offers benefits of purging deleterious alleles and maintaining variation at overdominant loci.