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Heredity (Edinb). 2000 Aug;85 ( Pt 2):191-8.

Wolbachia segregation rate in Drosophila simulans naturally bi-infected cytoplasmic lineages.

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1
Institut Jacques Monod, Laboratoire Dynamique du Génome & Evolution, Tour 42-4, CNRS - Universités Paris 6 & 7, 2 Place Jussieu, 75251 Paris Cedex 05, France.

Abstract

Wolbachia are maternally transmitted endocellular bacteria infecting several arthropod species. In order to study Wolbachia segregation rate, Drosophila simulans females from an Indo-Pacific population (Seychelles) bi-infected by the two Wolbachia variants wHa and wNo were backcrossed to uninfected males in two conditions. In the first case, Seychelles males from a stock cured from its Wolbachia by tetracycline treatment were used. In the second case, the males came from a naturally uninfected Tunisian population. It was found that (i) the two Wolbachia variants can segregate, so that bi-infected females can produce a few offspring infected only by wHa or wNo. This occurs in both backcross conditions. (ii) Segregation leads more frequently to wHa than to wNo mono-infection. (iii) Wolbachia transmission is lower when the Seychelles genome is introgressed by the Tunisian genome, suggesting that host genomic factors might influence infection fate.

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