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Bech N, Beltran-Bech S, Chupeau C, Peccoud J, Thierry M, Raimond R, Caubet Y, Sicard M, Grève P. Experimental evidence of Wolbachia introgressive acquisition between terrestrial isopod subspecies. Curr Zool 2021; 67:455-464. [PMID: 34616942 PMCID: PMC8489008 DOI: 10.1093/cz/zoaa078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 12/15/2020] [Indexed: 11/13/2022] Open
Abstract
Wolbachia are the most widespread endosymbiotic bacteria in animals. In many arthropod host species, they manipulate reproduction via several mechanisms that favor their maternal transmission to offspring. Among them, cytoplasmic incompatibility (CI) promotes the spread of the symbiont by specifically decreasing the fertility of crosses involving infected males and uninfected females, via embryo mortality. These differences in reproductive efficiency may select for the avoidance of incompatible mating, a process called reinforcement, and thus contribute to population divergence. In the terrestrial isopod Porcellio dilatatus, the Wolbachia wPet strain infecting the subspecies P. d. petiti induces unidirectional CI with uninfected individuals of the subspecies P. d. dilatatus. To study the consequences of CI on P. d. dilatatus and P. d. petiti hybridization, mitochondrial haplotypes and Wolbachia infection dynamics, we used population cages seeded with different proportions of the 2 subspecies in which we monitored these genetic parameters 5 and 7 years after the initial setup. Analysis of microsatellite markers allowed evaluating the degree of hybridization between individuals of the 2 subspecies. These markers revealed an increase in P. d. dilatatus nuclear genetic signature in all mixed cages, reflecting an asymmetry in hybridization. Hybridization led to the introgressive acquisition of Wolbachia and mitochondrial haplotype from P. d. petiti into nuclear genomes dominated by alleles of P. d. dilatatus. We discuss these results with regards to Wolbachia effects on their host (CI and putative fitness cost), and to a possible reinforcement that may have led to assortative mating, as possible factors contributing to the observed results.
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Affiliation(s)
- Nicolas Bech
- Laboratoire Ecologie et Biologie des Interactions EBI, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpain, TSA 51106 86073 POITIERS, Cedex 9, France
| | - Sophie Beltran-Bech
- Laboratoire Ecologie et Biologie des Interactions EBI, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpain, TSA 51106 86073 POITIERS, Cedex 9, France
| | - Cassandre Chupeau
- Laboratoire Ecologie et Biologie des Interactions EBI, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpain, TSA 51106 86073 POITIERS, Cedex 9, France
| | - Jean Peccoud
- Laboratoire Ecologie et Biologie des Interactions EBI, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpain, TSA 51106 86073 POITIERS, Cedex 9, France
| | - Magali Thierry
- Laboratoire Ecologie et Biologie des Interactions EBI, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpain, TSA 51106 86073 POITIERS, Cedex 9, France
| | - Roland Raimond
- Laboratoire Ecologie et Biologie des Interactions EBI, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpain, TSA 51106 86073 POITIERS, Cedex 9, France
| | - Yves Caubet
- Laboratoire Ecologie et Biologie des Interactions EBI, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpain, TSA 51106 86073 POITIERS, Cedex 9, France
| | - Mathieu Sicard
- ISEM, CNRS, IRD, EPHE, Université de Montpellier, Montpellier, France
| | - Pierre Grève
- Laboratoire Ecologie et Biologie des Interactions EBI, UMR CNRS 7267, Université de Poitiers, 5 rue Albert Turpain, TSA 51106 86073 POITIERS, Cedex 9, France
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