Evolutionary Biology

Experimental evolution of virulence and associated traits in a Drosophila melanogaster–Wolbachia symbiosis

10.24072/pcjournal.9 - Peer Community Journal, Volume 1 (2021), article no. e9.

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Evolutionary theory predicts that vertically transmitted symbionts are selected for low virulence, as their fitness is directly correlated to that of their host. In contrast with this prediction, the Wolbachia strain wMelPop drastically reduces its Drosophila melanogaster host lifespan at high rearing temperatures. It is generally assumed that this feature is maintained because the D. melanogaster-wMelPop symbiosis is usually not exposed to environmental conditions in which the symbiont is virulent. To test this hypothesis, we submitted wMelPop-infected D. melanogaster lines to 17 generations of experimental evolution at a high temperature, while enforcing late reproduction by artificial selection. The fly survival was measured at different time points, as well as two traits that have been proposed to be causally responsible for wMelPop virulence: its relative density and the mean number of copies of octomom, an 8-genes region of the Wolbachia genome. We hypothesised that these conditions (high temperature and late reproduction) would select for a reduced wMelPop virulence, a reduced wMelPop density, and a reduced octomom copy number. Our results indicate that density, octomom copy number and virulence are correlated to each other. However, contrary to our expectations, we could not detect any reduction in virulence during the course of evolution. We discuss the significance of our results with respect to the evolutionary causes of wMelPop virulence.

Published online:
DOI: 10.24072/pcjournal.9
Monnin, David 1; Kremer, Natacha 1; Michaud, Caroline 1; Villa, Manon 1; Henri, Hélène 1; Desouhant, Emmanuel 1; Vavre, Fabrice 1

1 Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR 5558, F-69622 Villeurbanne, France
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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Monnin, David; Kremer, Natacha; Michaud, Caroline; Villa, Manon; Henri, Hélène; Desouhant, Emmanuel; Vavre, Fabrice. Experimental evolution of virulence and associated traits in a Drosophila melanogaster–Wolbachia symbiosis. Peer Community Journal, Volume 1 (2021), article  no. e9. doi : 10.24072/pcjournal.9. https://peercommunityjournal.org/articles/10.24072/pcjournal.9/

Peer reviewed and recommended by PCI : 10.24072/pci.evolbiol.100111

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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