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Interspecific introgression mediates adaptation to whole genome duplication


Sarah Marburger

Patrick Monnahan

Paul J. Seear

Simon H. Martin

Jordan Koch

Pirita Paajanen


James D. Higgins

Roswitha Schmickl

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Professor of Evolutionary Genomics


Adaptive gene flow is a consequential phenomenon across all kingdoms. While recognition is increasing, examples lack of bidirectional gene flow mediating adaptations at loci that manage core processes. We previously discovered concerted molecular changes among interacting members of meiotic machinery controlling crossover number upon adaptation to whole genome duplication (WGD) in Arabidopsis arenosa. Here we conduct a population genomic study to test the hypothesis that adaptation to WGD has been mediated by adaptive gene flow between A. arenosa and A. lyrata. We find that A. lyrata underwent WGD more recently than A. arenosa, suggesting that pre-adapted alleles have rescued nascent A. lyrata, but we also detect gene flow in the opposite direction at functionally interacting loci under the most extreme levels of selection. These data indicate that bidirectional gene flow allowed for survival after WGD and that the merger of these species is greater than the sum of their parts.


Marburger, S., Monnahan, P., Seear, P. J., Martin, S. H., Koch, J., Paajanen, P., …Yant, L. (2019). Interspecific introgression mediates adaptation to whole genome duplication. Nature Communications, 10, Article 5218.

Journal Article Type Article
Acceptance Date Oct 24, 2019
Online Publication Date Nov 18, 2019
Publication Date Nov 18, 2019
Deposit Date Oct 31, 2019
Publicly Available Date Nov 18, 2019
Journal Nature Communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 10
Article Number 5218
Keywords General Biochemistry, Genetics and Molecular Biology; General Physics and Astronomy; General Chemistry
Public URL
Publisher URL
Additional Information Received: 1 May 2019; Accepted: 24 October 2019; First Online: 18 November 2019; : The authors declare no competing interests.


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