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Research article - Peer-reviewed, 2021

Asymmetric introgression reveals the genetic architecture of a plumage trait

Semenov, Georgy A.; Linck, Ethan; Enbody, Erik D.; Harris, Rebecca B.; Khaydarov, David R.; Alstrom, Per; Andersson, Leif; Taylor, Scott A.

Abstract

Genome-wide variation in introgression rates across hybrid zones offers a powerful opportunity for studying population differentiation. One poorly understood pattern of introgression is the geographic displacement of a trait implicated in lineage divergence from genome-wide population boundaries. While difficult to interpret, this pattern can facilitate the dissection of trait genetic architecture because traits become uncoupled from their ancestral genomic background. We studied an example of trait displacement generated by the introgression of head plumage coloration from personata to alba subspecies of the white wagtail. A previous study of their hybrid zone in Siberia revealed that the geographic transition in this sexual signal that mediates assortative mating was offset from other traits and genetic markers. Here we show that head plumage is associated with two small genetic regions. Despite having a simple genetic architecture, head plumage inheritance is consistent with partial dominance and epistasis, which could contribute to its asymmetric introgression. Hybrid zones are windows into the evolutionary process. Semenov et al. find that the head plumage differences between white wagtail subspecies have a simple genetic basis involving two small genetic regions, in which partially dominant and epistatic interactions help to explain how this sexual signal has become decoupled from other plumage traits.

Published in

Nature Communications
2021, volume: 12, number: 1, article number: 1019
Publisher: NATURE RESEARCH

Authors' information

Semenov, Georgy A.
University of Colorado Boulder
Linck, Ethan
University of New Mexico
Enbody, Erik D.
Uppsala University
Harris, Rebecca B.
Adaptive Biotechnologies
Khaydarov, David R.
School 171
Uppsala University
Chinese Academy of Sciences
Andersson, Leif
Uppsala University
Andersson, Leif
Texas A&M University
Andersson, Leif
Swedish University of Agricultural Sciences, Department of Animal Breeding and Genetics
Taylor, Scott A.
University of Colorado Boulder

UKÄ Subject classification

Evolutionary Biology

Publication Identifiers

DOI: https://doi.org/10.1038/s41467-021-21340-y

URI (permanent link to this page)

https://res.slu.se/id/publ/111549