Patterns of positive selection in seven ant genomes

Roux, Julien; Privman, Eyal; Moretti, Sébastien; Daub, Joséphine; Robinson-Rechavi, Marc; Keller, Laurent (2014). Patterns of positive selection in seven ant genomes. Molecular Biology and Evolution, 31(7), pp. 1661-1685. Oxford University Press 10.1093/molbev/msu141

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The evolution of ants is marked by remarkable adaptations that allowed the development of very complex social systems. To identify how ant-specific adaptations are associated with patterns of molecular evolution, we searched for signs of positive selection on amino-acid changes in proteins. We identified 24 functional categories of genes which were enriched for positively selected genes in the ant lineage. We also reanalyzed genome-wide datasets in bees and flies with the same methodology, to check whether positive selection was specific to ants or also present in other insects. Notably, genes implicated in immunity were enriched for positively selected genes in the three lineages, ruling out the hypothesis that the evolution of hygienic behaviors in social insects caused a major relaxation of selective pressure on immune genes. Our scan also indicated that genes implicated in neurogenesis and olfaction started to undergo increased positive selection before the evolution of sociality in Hymenoptera. Finally, the comparison between these three lineages allowed us to pinpoint molecular evolution patterns that were specific to the ant lineage. In particular, there was ant-specific recurrent positive selection on genes with mitochondrial functions, suggesting that mitochondrial activity was improved during the evolution of this lineage. This might have been an important step toward the evolution of extreme lifespan that is a hallmark of ants.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)

UniBE Contributor:

Daub, Joséphine

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

0737-4038

Publisher:

Oxford University Press

Language:

English

Submitter:

Isabelle Duperret

Date Deposited:

04 Sep 2015 08:07

Last Modified:

04 Sep 2015 08:07

Publisher DOI:

10.1093/molbev/msu141

BORIS DOI:

10.7892/boris.71396

URI:

https://boris.unibe.ch/id/eprint/71396

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