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Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Published on: February 3, 2023

Signatures of selective sweeps in continuous-space populations.

Meera Chotai¹, Xinzhu Wei¹, Philipp W Messer¹

¹Department of Computational Biology, Cornell University.

Biorxiv : the Preprint Server for Biology

|August 2, 2024

Summary

Spatial structure impacts selective sweeps by slowing adaptation and altering genetic diversity patterns. Limited dispersal can make sweeps appear softer and increase haplotype heterozygosity, complicating evolutionary inference.

Keywords:

Selective sweep continuous spatial structure haplotype patterns hard and soft sweeps site frequency spectrum

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Area of Science:

Evolutionary genetics
Population genetics

Background:

Selective sweeps, where adaptive mutations rapidly increase in frequency, are key evolutionary events.
Understanding sweep signatures is crucial, but traditional models often assume panmixia (random mating).
Natural populations exhibit spatial structure, influencing mating patterns and genetic exchange.

Purpose of the Study:

To investigate the effects of spatial population structure on the dynamics and signatures of selective sweeps.
To simulate selective sweeps in a two-dimensional landscape with varying dispersal rates.

Main Methods:

Simulations of selective sweeps in populations on a 2D continuous landscape.
Manipulation of offspring dispersal distance to model different levels of spatial structure, from panmictic to low-dispersal scenarios.

Main Results:

Low dispersal slows adaptive mutation spread and reduces recombination's effectiveness in breaking linkage disequilibrium around sweeps.
Reduced genetic diversity troughs around sweeps are consistent across dispersal rates.
Site frequency spectra in low-dispersal populations show enrichment of intermediate-frequency variants, mimicking soft sweeps.
Haplotype heterozygosity at sweep loci is elevated in low-dispersal populations compared to panmictic ones.

Conclusions:

Spatial population structure significantly alters selective sweep dynamics and detectable signatures.
Inferences about selective sweeps require incorporating spatial structure to avoid misinterpreting sweep characteristics.
Haplotype patterns under low dispersal can resemble soft sweeps, necessitating careful interpretation.