Inversions shape the divergence of Drosophila pseudoobscura and Drosophila persimilis on multiple timescales

By shaping meiotic recombination, chromosomal inversions can influence genetic exchange between hybridizing species. Despite the recognized importance of inversions in evolutionary processes such as divergence and speciation, teasing apart the effects of inversions over time remains challenging. For...

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Bibliographic Details
Published in:Evolution 2021-07, Vol.75 (7), p.1820-1834
Main Authors: Korunes, Katharine L., Machado, Carlos A., Noor, Mohamed A. F.
Format: Article
Language:English
Subjects:
Divergence
Drosophila persimilis
Drosophila pseudoobscura
Evolution
Fruit flies
Gene flow
Gene polymorphism
Genomes
Insects
introgression
Inversions
Linkage disequilibrium
Meiosis
Nucleotide sequence
ORIGINAL ARTICLE
Polymorphism
Recombination
Speciation
Sympatric populations
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Summary:By shaping meiotic recombination, chromosomal inversions can influence genetic exchange between hybridizing species. Despite the recognized importance of inversions in evolutionary processes such as divergence and speciation, teasing apart the effects of inversions over time remains challenging. For example, are their effects on sequence divergence primarily generated through creating blocks of linkage disequilibrium prespeciation or through preventing gene flux after speciation? We provide a comprehensive look into the influence of inversions on gene flow throughout the evolutionary history of a classic system: Drosophila pseudoobscura and Drosophila persimilis. We use extensive whole-genome sequence data to report patterns of introgression and divergence with respect to chromosomal arrangements. Overall, we find evidence that inversions have contributed to divergence patterns between D. pseudoobscura and D. persimilis over three distinct timescales: (1) segregation of ancestral polymorphism early in the speciation process, (2) gene flow after the split of D. pseudoobscura and D. persimilis, but prior to the split of D. pseudoobscura subspecies, and (3) recent gene flow between sympatric D. pseudoobscura and D. persimilis, after the split of D. pseudoobscura subspecies. We discuss these results in terms of our understanding of evolution in this classic system and provide cautions for interpreting divergence measures in other systems.
ISSN:0014-3820
1558-5646
DOI:10.1111/evo.14278