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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Outcrossing Complicates Mutation Purging by Trapping Single Nucleotide Polymorphisms in Structural Variant Mutations.

R Kapila1,2, S Saber1,2, R K Verma1,2

  • 1Department of Biological Sciences, Florida International University, 11200 8th Street, Miami, 33199, FL, USA.

Biorxiv : the Preprint Server for Biology
|August 20, 2025
PubMed
Summary
This summary is machine-generated.

Outcrossing, or sexual reproduction, hinders the purging of structural mutations by trapping them. This challenges the idea that sex always improves genomic resilience.

Keywords:
Caenorhabditis elegansGenomeMutationsOutcrossingStructural variations

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Genomics

Background:

  • Classical theories propose that outcrossing (sexual reproduction) purges deleterious mutations via recombination.
  • Larger structural variants (insertions, deletions, inversions) can impede recombination, forming linkage blocks.

Purpose of the Study:

  • To investigate how outcrossing affects the purging of structural mutations.
  • To challenge the prevailing view that sex uniformly promotes genomic resilience.

Main Methods:

  • Experimental evolution in *C. elegans* lines.
  • Whole-genome sequencing to identify mutations.
  • Population genetic simulations.

Main Results:

  • Outcrossing populations retained both small and large structural mutations.
  • Single nucleotide polymorphisms were found trapped within larger structural variants.
  • Structural variants accumulated more readily at higher outcrossing rates.

Conclusions:

  • Outcrossing can hinder the removal of structural mutations, contradicting classical expectations.
  • The purging of mutations is complicated by structural variants trapping smaller variants.
  • Sex does not uniformly promote genomic resilience due to constraints on mutation purging.