Rapid parallel adaptation despite gene flow in silent crickets
Date
04/01/2021Grant ID
105621/Z/14/Z
NE/T000619/1
Ne/I027800/1
NE/L011255/1
Metadata
Show full item recordAbstract
Gene flow is predicted to impede parallel adaptation via de novo mutation, because it can introduce pre-existing adaptive alleles from population to population. We test this using Hawaiian crickets (Teleogryllus oceanicus) in which ‘flatwing’ males that lack sound-producing wing structures recently arose and spread under selection from an acoustically-orienting parasitoid. Morphometric and genetic comparisons identify distinct flatwing phenotypes in populations on three islands, localized to different loci. Nevertheless, we detect strong, recent and ongoing gene flow among the populations. Using genome scans and gene expression analysis we find that parallel evolution of flatwing on different islands is associated with shared genomic hotspots of adaptation that contain the gene doublesex, but the form of selection differs among islands and corresponds to known flatwing demographics in the wild. We thus show how parallel adaptation can occur on contemporary timescales despite gene flow, indicating that it could be less constrained than previously appreciated.
Citation
Zhang , X , Rayner , J G , Blaxter , M & Bailey , N W 2021 , ' Rapid parallel adaptation despite gene flow in silent crickets ' , Nature Communications , vol. 12 , 50 . https://doi.org/10.1038/s41467-020-20263-4
Publication
Nature Communications
Status
Peer reviewed
ISSN
2041-1723Type
Journal article
Description
The work was funded by Natural Environment Research Council awards to N.W.B. [NE/I027800/1, NE/L011255/1]. Bioinformatics support was provided by a Wellcome Trust ISSF award [105621/Z/14/Z]. X.Z. was supported by a China Scholarship Council PhD studentship [201703780018].Collections
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