Predictability and parallelism in the contemporary evolution of hybrid genomes

• DOI: 10.1371/journal.pgen.1009914
• Publication Date: 2022-01-27T18:25:04Z
• Authors: Quinn K. Langdon; Daniel L. Powell; Bernard Kim; Shreya M. Banerjee; Cheyenne Payne; Tristram O. Dodge; Ben Moran; Paola Fascinetto-...; Molly Schumer
• Keywords: Xiphophorus; Concerted evolution; Hybrid zone; Predictability; Introgression

Hybridization between species is widespread across the tree of life. As a result, many species, including our own, harbor regions their genome derived from hybridization. Despite recognition that this process widespread, we understand little about how stabilizes following hybridization, and whether mechanisms driving stabilization tend to be shared species. Here, dissect drivers variation in local ancestry replicated hybridization events two pairs swordtail fish: Xiphophorus birchmanni × X . cortezi malinche We find unexpectedly high levels repeatability types hybrid populations. This attributable part fact recombination landscape locations functionally important elements play major role both Beyond these broad scale patterns, identify dozens where minor parent unusually low or pairs. Analysis points sites under selection pairs, some cases, selection. show one such region previously unknown incompatibility