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Parallel adaptive divergence among geographically diverse human populations.

Jacob A Tennessen1, Joshua M Akey

  • 1Department of Genome Sciences, University of Washington, Seattle, Washington, USA. tennej@uw.edu

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Summary

Human adaptation often involves subtle genetic changes across many genes, not just single mutations. This study introduces a new method to detect this complex selection, revealing widespread parallel evolution in human populations.

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Area of Science:

  • Human genetics
  • Evolutionary biology
  • Population genetics

Background:

  • Classic models of positive selection focus on rapid fixation of new mutations.
  • Human adaptation likely involves more complex mechanisms, such as changes in standing genetic variation.
  • Detecting complex selection requires integrating diverse genetic and geographic data.

Purpose of the Study:

  • To develop and validate a novel method for detecting parallel selection acting on standing variation across independent human populations.
  • To investigate whether selection has favored modest genetic divergence at multiple loci in human populations.
  • To identify genes and genetic variants involved in local adaptation.

Main Methods:

  • Development of a new statistical approach to identify non-neutral parallel divergence at single nucleotide polymorphisms (SNPs).
  • Analysis of genomically and geographically extensive human population data.
  • Validation of the method using extensive coalescent simulations to assess robustness to demographic events.

Main Results:

  • An excess of single nucleotide polymorphisms (SNPs) showing parallel, non-neutral divergence was detected.
  • These SNPs are enriched in genes with diverse functions, including those related to disease.
  • Evidence suggests repeated parallel evolution, indicating common selective pressures in different environments.

Conclusions:

  • Human adaptation is frequently driven by subtle shifts in standing variation at numerous loci, rather than single strong selective events.
  • The findings reveal patterns of local adaptation that are phylogenetically independent, suggesting convergent evolution.
  • This complex adaptation likely contributes significantly to human phenotypic diversity.