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Haplotype structure - an overlooked key factor shaping the genomic selection response.

Changyi Xiao1,2, Viola Nolte1, Christian Schlötterer1

  • 1Institut für Populationsgenetik, Vetmeduni Vienna, Vienna 1210, Austria.

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Haplotype structure significantly influences polygenic adaptation. Linked alleles respond jointly, making genomic responses more similar within ancestral population groups, even under identical selection pressures.

Keywords:
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Area of Science:

  • Evolutionary genetics
  • Genomics
  • Population genetics

Background:

  • Polygenic adaptation allows populations to reach new trait optima through changes in multiple genes.
  • Genetic redundancy means selection can act on different sets of genes, leading to varied genomic responses across populations.
  • Linkage disequilibrium (LD) can constrain adaptation by causing linked genes to evolve together, potentially impacting the independence of selection.

Purpose of the Study:

  • To investigate the role of haplotype structure in shaping genomic responses during polygenic adaptation.
  • To determine if linked alleles, constrained by haplotype blocks, influence the similarity of adaptation among replicate populations.
  • To assess the impact of haplotype structure compared to environmental differences on genomic divergence.

Main Methods:

  • Experimental evolution using multiple replicate lines of Drosophila simulans from the same natural population (supergroups).
  • Independent adaptation of replicate lines to a novel temperature regime.
  • Genomic analysis to compare the similarity of responses within and between supergroups.
  • Computer simulations to model and validate the role of haplotype structure.

Main Results:

  • Genomic responses were more similar among replicates from the same supergroup than from different supergroups.
  • This similarity suggests haplotype structure, not just selection, significantly constrains the genomic response.
  • Haplotype structure created greater genomic differentiation between supergroups than adaptation to different temperature environments.

Conclusions:

  • Haplotype structure plays a crucial role in determining the genomic signatures of polygenic adaptation.
  • The findings highlight the stochastic nature of adaptation, influenced by the initial genetic makeup (haplotypes) of populations.
  • Understanding haplotype effects is essential for interpreting genomic patterns of selection.