Local ancestry analysis reveals genomic convergence in extremophile fishes.

ABSTRACT: The molecular basis of convergent phenotypes is often unknown. However, convergence at a genomic level is predicted when there are large population sizes, gene flow among diverging lineages or strong genetic constraints. We used whole-genome resequencing to investigate genomic convergence in fishes ( Poecilia spp.) that have repeatedly colonized hydrogen sulfide (H₂S)-rich environments in Mexico. We identified genomic similarities in both single nucleotide polymorphisms (SNPs) and structural variants (SVs) among independently derived sulfide spring populations, with approximately 1.2% of the genome being shared among sulfidic ecotypes. We compared these convergent genomic regions to candidate genes for H₂S adaptation identified from transcriptomic analyses and found t

SUBMITTER: Brown AP 

PROVIDER: S-EPMC6560267 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature