Schlichta, Flávia; Peischl, Stephan; Excoffier, Laurent (2022). The impact of genetic surfing on neutral genomic diversity. Molecular Biology and Evolution, 39(11) Oxford University Press 10.1093/molbev/msac249
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Range expansions have been common in the history of most species. Serial founder effects and subsequent population growth at expansion fronts typically lead to loss of genomic diversity along the expansion axis. A frequent consequence is the phenomenon of "gene surfing", where variants located near the expanding front can reach high frequencies or even fix in newly colonized territories. Although gene surfing events have been characterized thoroughly for a specific locus, their effects on linked genomic regions and on the overall patterns of genomic diversity have been little investigated. In this study, we simulated the evolution of whole genomes during several types of 1D and 2D range expansions differing by the extent of migration, founder events and recombination rates. We focused on the characterization of local dips of diversity, or "troughs", taken as a proxy for surfing events. We find that, for a given recombination rate, once we consider the amount of diversity lost since the beginning of the expansion, it is possible to predict the initial evolution of trough density and their average width irrespectively of the expansion condition. Furthermore, when recombination rates vary across the genome, we find that troughs are over-represented in regions of low recombination. Therefore, range expansions can leave local and global genomic signatures often interpreted as evidence of past selective events. Given the generality of our results, they could be used as a null model for species having gone through recent expansions, and thus be helpful to correctly interpret many evolutionary biology studies.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) 08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Population Genetics 08 Faculty of Science > Department of Biology > Bioinformatics and Computational Biology |
UniBE Contributor: |
Schlichta, Flávia, Peischl, Stephan, Excoffier, Laurent |
Subjects: |
000 Computer science, knowledge & systems 500 Science > 570 Life sciences; biology |
ISSN: |
0737-4038 |
Publisher: |
Oxford University Press |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
22 Nov 2022 09:53 |
Last Modified: |
05 Dec 2022 16:28 |
Publisher DOI: |
10.1093/molbev/msac249 |
PubMed ID: |
36403964 |
Uncontrolled Keywords: |
Range expansions genetic surfing genome scan genomic diversity |
BORIS DOI: |
10.48350/175016 |
URI: |
https://boris.unibe.ch/id/eprint/175016 |
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