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Evolution of polygenic traits under global vs local adaptation.

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  • 1Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada.

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Local adaptation can lead to concentrated genetic architectures with large-effect alleles, unlike global adaptation. Understanding this genetic architecture is key to evolutionary insights in medicine and agriculture.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Genomics

Background:

  • Genetic architecture, encompassing allele number, frequency, effect size, and genomic distribution, shapes evolutionary outcomes.
  • Understanding genetic architecture is crucial for applications in agriculture and medicine, offering insights into evolutionary processes.

Purpose of the Study:

  • To review theoretical predictions on the evolution of genetic architecture under global versus local adaptation.
  • To explore factors limiting the evolution of concentrated genetic architectures.

Main Methods:

  • Theoretical review of evolutionary predictions.
  • Comparison of genetic architecture under spatially homogeneous (global) and heterogeneous (local) adaptation.
  • Discussion of empirical data from natural populations and lab experiments.

Main Results:

  • Local adaptation can favor concentrated genetic architectures with larger effect alleles in fewer genomic regions compared to global adaptation.
  • Factors like genotypic redundancy, mutation rate, and environmental variability can limit the evolution of concentrated architectures.

Conclusions:

  • Differences in genetic architecture among traits and species provide insights into evolutionary mechanisms.
  • Interpreting these differences requires considering the type of selection (global vs. local) that has operated.