Multi-infections of feminizing Wolbachia strains in natural populations of the terrestrial isopod Armadillidium Vulgare

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Abstract

Maternally inherited Wolbachia (α-Proteobacteria) are widespread parasitic reproductive manipulators. A growing number of studies have described the presence of different Wolbachia strains within a same host. To date, no naturally occurring multiple infections have been recorded in terrestrial isopods. This is true for Armadillidium vulgare which is known to harbor non simultaneously three Wolbachia strains. Traditionally, such Wolbachia are detected by PCR amplification of the wsp gene and strains are characterized by sequencing. The presence of nucleotide deletions or insertions within the wsp gene, among these three different strains, provides the opportunity to test a novel genotyping method. Herein, we designed a new primer pair able to amplify products whose lengths are specific to each Wolbachia strain so as to detect the presence of multi-infections in A. vulgare. Experimental injections of Wolbachia strains in Wolbachia-free females were used to validate the methodology. We re-investigated, using this novel method, the infection status of 40 females sampled in 2003 and previously described as mono-infected based on the classical sequencing method. Among these females, 29 were identified as bi-infected. It is the first time that naturally occuring multiple infections of Wolbachia are detected within an individual A. vulgare host. Additionally, we resampled 6 of these populations in 2010 to check the infection status of females. Copyright: © 2013 Valette et al.

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Valette, V., Bitome Essono, P. Y., Le Clec’h, W., Johnson, M., Bech, N., & Grandjean, F. (2013). Multi-infections of feminizing Wolbachia strains in natural populations of the terrestrial isopod Armadillidium Vulgare. PLoS ONE, 8(12). https://doi.org/10.1371/journal.pone.0082633

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