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Admixture of evolutionary rates across a butterfly hybrid zone

Xiong, Tianzhu; Li, Xueyan; Yago, Masaya; Mallet, James; (2022) Admixture of evolutionary rates across a butterfly hybrid zone. eLife , 11 , Article e78135. 10.7554/eLife.78135. Green open access

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Abstract

Hybridization is a major evolutionary force that can erode genetic differentiation between species, whereas reproductive isolation maintains such differentiation. In studying a hybrid zone between the swallowtail butterflies Papilio syfanius and Papilio maackii (Lepidoptera: Papilionidae), we made the unexpected discovery that genomic substitution rates are unequal between the parental species. This phenomenon creates a novel process in hybridization, where genomic regions most affected by gene flow evolve at similar rates between species, while genomic regions with strong reproductive isolation evolve at species-specific rates. Thus, hybridization mixes evolutionary rates in a way similar to its effect on genetic ancestry. Using coalescent theory, we show that the rate-mixing process provides distinct information about levels of gene flow across different parts of genomes, and the degree of rate-mixing can be predicted quantitatively from relative sequence divergence (FST ) between the hybridizing species at equilibrium. Overall, we demonstrate that reproductive isolation maintains not only genomic differentiation, but also the rate at which differentiation accumulates. Thus, asymmetric rates of evolution provide an additional signature of loci involved in reproductive isolation.

Type: Article
Title: Admixture of evolutionary rates across a butterfly hybrid zone
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.7554/eLife.78135
Publisher version: https://doi.org/10.7554/eLife.78135
Language: English
Additional information: Copyright © et al. This article is distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use and redistribution provided that the original author and source are credited.
Keywords: Science & Technology, Life Sciences & Biomedicine, Biology, Life Sciences & Biomedicine - Other Topics, hybridization, reproductive isolation, molecular clock, gene flow, Other, DIVERGENT SELECTION, MUTATION-RATE, GENE FLOW, HYBRIDIZATION, POPULATION, SPECIATION, REVEALS, ROAD
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: https://discovery.ucl.ac.uk/id/eprint/10165520
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