Dupas Stéphane, Gitau C. W., Branca A., Le Rü Bruno, Silvain Jean-François. (2008). Evolution of a polydnavirus gene in relation to parasitoid-host species immune resistance. Journal of Heredity, 99 (5), p. 491-499. ISSN 0022-1503.
Titre du document
Evolution of a polydnavirus gene in relation to parasitoid-host species immune resistance
Dupas Stéphane, Gitau C. W., Branca A., Le Rü Bruno, Silvain Jean-François
Source
Journal of Heredity, 2008,
99 (5), p. 491-499 ISSN 0022-1503
CrV1, a polydisperse DNA virus (polydnavirus or PDV) gene contributes to the suppression of host immunity in Cotesia genus parasitoids. Its molecular evolution was analyzed in relation to levels of resistance in the sympatric host species. Natural selection for nonsynonymous substitutions (positive Darwinian selection) was observed at specific amino acid sites among CrV1 variants; particularly, between parasitoid strains immune suppressive and nonimmune suppressive to the main resistant stem borer host, Busseola fusca. In Cotesia sesamiae, geographic distribution of CrV1 alleles in Kenya was correlated to the relative abundance of B. fusca. These results suggest that PDV genes evolve through natural selection and are genetically linked to factors of suppression of local host resistance. We discuss the forces driving the evolution of CrV1 and its use as a marker to understand parasitoid adaptation to host resistance in biological control.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
