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Adaptive gene introgression after secondary contact.

Hildegard Uecker1, Derek Setter, Joachim Hermisson

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Gene introgression allows beneficial alleles to cross species boundaries. Our model quantizes the establishment probability of adaptive alleles, considering linked and unlinked deleterious alleles during hybridization.

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Gene introgression across species boundaries facilitates adaptation transfer.
  • Deleterious alleles linked to beneficial ones can impede this process.

Purpose of the Study:

  • To model the establishment probability of adaptive alleles during introgression.
  • To analyze the impact of linked and unlinked deleterious alleles on gene flow.

Main Methods:

  • Developed a stochastic model incorporating linked and unlinked deleterious alleles.
  • Utilized reducible multitype branching process theory.
  • Derived a recursive expression for establishment probability.

Main Results:

  • Quantified the establishment probability of beneficial alleles after hybridization.
  • Studied the hitchhiking probability of slightly deleterious alleles.
  • Model accurately predicts outcomes across various genetic scenarios.

Conclusions:

  • The study provides a theoretical framework for understanding adaptive introgression.
  • The model's accuracy is validated by simulations across a wide parameter range.
  • Offers insights into the evolutionary dynamics of gene flow and adaptation.