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Sperm competition shapes gene expression and sequence evolution in the ocellated wrasse

Dean, R; Wright, AE; Marsh-Rollo, SE; Nugent, BM; Alonzo, SH; Mank, JE; (2017) Sperm competition shapes gene expression and sequence evolution in the ocellated wrasse. Molecular Ecology , 26 (2) pp. 505-518. 10.1111/mec.13919. Green open access

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Abstract

Gene expression differences between males and females often underlie sexually dimorphic phenotypes and the expression levels of genes that are differentially expressed between the sexes is thought to respond to sexual selection. Most studies on the transcriptomic response to sexual selection treat sexual selection as a single force, but post-mating sexual selection in particular is expected to specifically target gonadal tissue. The three male morphs of the ocellated wrasse (Symphodus ocellatus) make it possible to test the role of post-mating sexual selection in shaping the gonadal transcriptome. Nesting males hold territories and have the highest reproductive success, yet we detected feminisation of their gonadal gene expression compared to satellite males. Satellite males are less brightly coloured and experience more intense sperm competition than nesting males. In line with post-mating sexual selection affecting gonadal gene expression, we detected a more masculinised expression profile in satellites. Sneakers are the lowest quality males and showed both de-masculinisation and de-feminisation of gene expression. We also detected higher rates of gene sequence evolution of male-biased genes compared to unbiased genes, which could at least in part be explained by positive selection. Together, these results reveal the potential for post-mating sexual selection to drive higher rates of gene sequence evolution and shape the gonadal transcriptome profile.

Type: Article
Title: Sperm competition shapes gene expression and sequence evolution in the ocellated wrasse
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/mec.13919
Publisher version: http://dx.doi.org/10.1111/mec.13919
Language: English
Additional information: This is the peer reviewed version of the following article: Dean, R; Wright, AE; Marsh-Rollo, SE; Nugent, BM; Alonzo, SH; Mank, JE; (2017) Sperm competition shapes gene expression and sequence evolution in the ocellated wrasse. Molecular Ecology, 26 (2) pp. 505-518, which has been published in final form at http://dx.doi.org/10.1111/mec.13919. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Keywords: Masculinization, alternative reproductive tactics, morphs, positive selection, expression variance, sex-biased gen
UCL classification: UCL > Provost and Vice Provost Offices
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: http://discovery.ucl.ac.uk/id/eprint/1524736
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