Mass of genes rather than master genes underlie the genomic architecture of amphibian speciation.

ABSTRACT: The genetic architecture of speciation, i.e., how intrinsic genomic incompatibilities promote reproductive isolation (RI) between diverging lineages, is one of the best-kept secrets of evolution. To directly assess whether incompatibilities arise in a limited set of large-effect speciation genes, or in a multitude of loci, we examined the geographic and genomic landscapes of introgression across the hybrid zones of 41 pairs of frog and toad lineages in the Western Palearctic region. As the divergence between lineages increases, phylogeographic transitions progressively become narrower, and larger parts of the genome resist introgression. This suggests that anuran speciation proceeds through a gradual accumulation of multiple barrier loci scattered across the genome, which ultimately deplet

SUBMITTER: Dufresnes C 

PROVIDER: S-EPMC8433553 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature