Parental Population Range Expansion before Secondary Contact Promotes Heterosis.

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  • Author(s): MacPherson A; Wang S; Yamaguchi R; Rieseberg LH; Otto SP
  • Source:
    The American naturalist [Am Nat] 2022 Jul; Vol. 200 (1), pp. E1-E15. Date of Electronic Publication: 2022 May 26.
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: University of Chicago Press Country of Publication: United States NLM ID: 2984688R Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1537-5323 (Electronic) Linking ISSN: 00030147 NLM ISO Abbreviation: Am Nat Subsets: MEDLINE
    • Publication Information:
      Publication: Chicago, IL : University of Chicago Press
      Original Publication: Salem, Mass. : Essex Institute
    • Subject Terms:
      Genetic Speciation* ; Hybrid Vigor*; Alleles ; Genetics, Population ; Hybridization, Genetic ; Models, Genetic
    • Abstract:
      AbstractPopulation genomic analysis of hybrid zones is instrumental to our understanding of the evolution of reproductive isolation. Many temperate hybrid zones are formed by the secondary contact between two parental populations that have undergone postglacial range expansion. Here, we show that explicitly accounting for historical parental isolation followed by range expansion prior to secondary contact is fundamental to explaining genetic and fitness patterns in these hybrid zones. Specifically, ancestral population expansion can result in allele surfing, where neutral or slightly deleterious mutations drift to high frequency at the expansion front. If these surfed deleterious alleles are recessive, they can contribute to substantial heterosis in hybrids produced at secondary contact, counteracting negative effects of Bateson-Dobzhansky-Muller incompatibilities (BDMIs) and hence weakening reproductive isolation. When BDMIs are linked to such recessive deleterious alleles, the fitness benefit of introgression at these loci can facilitate introgression at the BDMIs. The extent to which this occurs depends on the strength of selection against the linked deleterious alleles and the distribution of recombination across the chromosome. Finally, surfing of neutral loci can alter the expected pattern of population ancestry; thus, accounting for historical population expansion is necessary to develop accurate null genomic models of secondary contact hybrid zones.
    • Contributed Indexing:
      Keywords: allele surfing; genetic incompatibilities; hybrid zone; range expansion
    • Molecular Sequence:
      Dryad 10.5061/dryad.0vt4b8h07
    • Publication Date:
      Date Created: 20220623 Date Completed: 20220627 Latest Revision: 20220712
    • Publication Date:
      20221213
    • Accession Number:
      10.1086/719656
    • Accession Number:
      35737992