Population genomics of eusocial insects: the costs of a vertebrate-like effective population size

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Ressource 1Télécharger: BIB_F5D20E9B9638.P001.pdf (359.36 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_F5D20E9B9638
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Population genomics of eusocial insects: the costs of a vertebrate-like effective population size
Périodique
Journal of Evolutionary Biology
Auteur(s)
Romiguier J., Lourenco J., Gayral P., Faivre N., Weiner L.A., Ravel S., Ballenghien M., Cahais V., Bernard A., Loire E., Keller L., Galtier N.
ISSN
1420-9101
ISSN-L
1010-061X
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
27
Numéro
3
Pages
593-603
Langue
anglais
Résumé
The evolution of reproductive division of labour and social life in social insects has lead to the emergence of several life-history traits and adaptations typical of larger organisms: social insect colonies can reach masses of several kilograms, they start reproducing only when they are several years old, and can live for decades. These features and the monopolization of reproduction by only one or few individuals in a colony should affect molecular evolution by reducing the effective population size. We tested this prediction by analysing genome-wide patterns of coding sequence polymorphism and divergence in eusocial vs. noneusocial insects based on newly generated RNA-seq data. We report very low amounts of genetic polymorphism and an elevated ratio of nonsynonymous to synonymous changes - a marker of the effective population size - in four distinct species of eusocial insects, which were more similar to vertebrates than to solitary insects regarding molecular evolutionary processes. Moreover, the ratio of nonsynonymous to synonymous substitutions was positively correlated with the level of social complexity across ant species. These results are fully consistent with the hypothesis of a reduced effective population size and an increased genetic load in eusocial insects, indicating that the evolution of social life has important consequences at both the genomic and population levels.
Mots-clé
genomics, insects, life-history evolution, molecular evolution, population genetics
Web of science
Création de la notice
03/01/2014 20:30
Dernière modification de la notice
20/08/2019 17:22
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