Recurrent selection shapes the genomic landscape of differentiation between a pair of host-specialized haplodiploids that diverged with gene flow.

Autor: Glover AN; Department of Biology, University of Kentucky, Lexington, Kentucky, USA., Sousa VC; Department of Animal Biology, CE3C - Center for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa, University of Lisbon, Lisbon, Lisboa, Portugal., Ridenbaugh RD; Department of Biology, University of Kentucky, Lexington, Kentucky, USA., Sim SB; USDA-ARS Daniel K. Inouye US Pacific Basin Agricultural Research Center Tropical Pest Genetics and Molecular Biology Research Unit, Hilo, Hawaii, USA., Geib SM; USDA-ARS Daniel K. Inouye US Pacific Basin Agricultural Research Center Tropical Pest Genetics and Molecular Biology Research Unit, Hilo, Hawaii, USA., Linnen CR; Department of Biology, University of Kentucky, Lexington, Kentucky, USA.
Jazyk: angličtina
Zdroj: Molecular ecology [Mol Ecol] 2024 Sep; Vol. 33 (18), pp. e17509. Date of Electronic Publication: 2024 Aug 20.
DOI: 10.1111/mec.17509
Abstrakt: Understanding the genetics of adaptation and speciation is critical for a complete picture of how biodiversity is generated and maintained. Heterogeneous genomic differentiation between diverging taxa is commonly documented, with genomic regions of high differentiation interpreted as resulting from differential gene flow, linked selection and reduced recombination rates. Disentangling the roles of each of these non-exclusive processes in shaping genome-wide patterns of divergence is challenging but will enhance our knowledge of the repeatability of genomic landscapes across taxa. Here, we combine whole-genome resequencing and genome feature data to investigate the processes shaping the genomic landscape of differentiation for a sister-species pair of haplodiploid pine sawflies, Neodiprion lecontei and Neodiprion pinetum. We find genome-wide correlations between genome features and summary statistics are consistent with pervasive linked selection, with patterns of diversity and divergence more consistently predicted by exon density and recombination rate than the neutral mutation rate (approximated by dS). We also find that both global and local patterns of F ST , d XY and π provide strong support for recurrent selection as the primary selective process shaping variation across pine sawfly genomes, with some contribution from balancing selection and lineage-specific linked selection. Because inheritance patterns for haplodiploid genomes are analogous to those of sex chromosomes, we hypothesize that haplodiploids may be especially prone to recurrent selection, even if gene flow occurred throughout divergence. Overall, our study helps fill an important taxonomic gap in the genomic landscape literature and contributes to our understanding of the processes that shape genome-wide patterns of genetic variation.
(© 2024 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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