The origin and remolding of genomic islands of differentiation in the European sea bass

Maud Duranton (), François Allal, Christelle Fraïsse, Nicolas Bierne, François Bonhomme and Pierre-Alexandre Gagnaire
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Maud Duranton: Institut des Sciences de l’Evolution de Montpellier - UMR5554 UM-CNRS-IRD-EPHE
François Allal: Université de Montpellier
Christelle Fraïsse: Institut des Sciences de l’Evolution de Montpellier - UMR5554 UM-CNRS-IRD-EPHE
Nicolas Bierne: Institut des Sciences de l’Evolution de Montpellier - UMR5554 UM-CNRS-IRD-EPHE
François Bonhomme: Institut des Sciences de l’Evolution de Montpellier - UMR5554 UM-CNRS-IRD-EPHE
Pierre-Alexandre Gagnaire: Institut des Sciences de l’Evolution de Montpellier - UMR5554 UM-CNRS-IRD-EPHE

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: Abstract Speciation is a complex process that leads to the progressive establishment of reproductive isolation barriers between diverging populations. Genome-wide comparisons between closely related species have revealed the existence of heterogeneous divergence patterns, dominated by genomic islands of increased divergence supposed to contain reproductive isolation loci. However, this divergence landscape only provides a static picture of the dynamic process of speciation, during which confounding mechanisms unrelated to speciation can interfere. Here we use haplotype-resolved whole-genome sequences to identify the mechanisms responsible for the formation of genomic islands between Atlantic and Mediterranean sea bass lineages. Local ancestry patterns show that genomic islands first emerged in allopatry through linked selection acting on a heterogeneous recombination landscape. Then, upon secondary contact, preexisting islands were strongly remolded by differential introgression, revealing variable fitness effects among regions involved in reproductive isolation. Interestingly, we find that divergent regions containing ancient polymorphisms conferred the strongest resistance to introgression.

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04963-6

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DOI: 10.1038/s41467-018-04963-6

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