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Field cricket genome reveals the footprint of recent, abrupt adaptation in the wild.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Pascoal, Sonia 
Risse, Judith E 
Zhang, Xiao 
Blaxter, Mark 
Cezard, Timothee 

Abstract

Evolutionary adaptation is generally thought to occur through incremental mutational steps, but large mutational leaps can occur during its early stages. These are challenging to study in nature due to the difficulty of observing new genetic variants as they arise and spread, but characterizing their genomic dynamics is important for understanding factors favoring rapid adaptation. Here, we report genomic consequences of recent, adaptive song loss in a Hawaiian population of field crickets (Teleogryllus oceanicus). A discrete genetic variant, flatwing, appeared and spread approximately 15 years ago. Flatwing erases sound-producing veins on male wings. These silent flatwing males are protected from a lethal, eavesdropping parasitoid fly. We sequenced, assembled and annotated the cricket genome, produced a linkage map, and identified a flatwing quantitative trait locus covering a large region of the X chromosome. Gene expression profiling showed that flatwing is associated with extensive genome-wide effects on embryonic gene expression. We found that flatwing male crickets express feminized chemical pheromones. This male feminizing effect, on a different sexual signaling modality, is genetically associated with the flatwing genotype. Our findings suggest that the early stages of evolutionary adaptation to extreme pressures can be accompanied by greater genomic and phenotypic disruption than previously appreciated, and highlight how abrupt adaptation might involve suites of traits that arise through pleiotropy or genomic hitchhiking.

Description

Keywords

Adaptation, feminization, genomics, rapid evolution, sexual signaling, trait loss

Journal Title

Evol Lett

Conference Name

Journal ISSN

2056-3744
2056-3744

Volume Title

4

Publisher

Oxford University Press (OUP)
Sponsorship
Biotechnology and Biological Sciences Research Council (BBS/E/T/000PR9818, BB/K020161/1)
Natural Environment Research Council (NBAF010002, NBAF010003)
Wellcome Trust (105621/Z/14/Z)