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Villacis A. G., Marcet P. L., Yumiseva C. A., Dotson E. M., Tibayrenc Michel, Brenière Simone Frédérique, Grijalva M. J. (2017). Pioneer study of population genetics of Rhodnius ecuadoriensis (Hemiptera : Reduviidae) from the central coastand southern Andean regions of Ecuador. Infection Genetics and Evolution, 53, 116-127. ISSN 1567-1348

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Lien direct chez l'éditeur doi:10.1016/j.meegid.2017.05.019

Titre
Pioneer study of population genetics of Rhodnius ecuadoriensis (Hemiptera : Reduviidae) from the central coastand southern Andean regions of Ecuador
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000404559400016
AuteursVillacis A. G., Marcet P. L., Yumiseva C. A., Dotson E. M., Tibayrenc Michel, Brenière Simone Frédérique, Grijalva M. J.
SourceInfection Genetics and Evolution, 2017, 53, p. 116-127. ISSN 1567-1348
RésuméEffective control of Chagas disease vector populations requires a good understanding of the epidemiological components, including a reliable analysis of the genetic structure of vector populations. Rhodnius ecuadoriensis is the most widespread vector of Chagas disease in Ecuador, occupying domestic, peridomestic and sylvatic habitats. It is widely distributed in the central coast and southern highlands regions of Ecuador, two very different regions in terms of bio-geographical characteristics. To evaluate the genetic relationship among R. ecuadoriensis populations in these two regions, we analyzed genetic variability at two microsatellite loci for 326 specimens (n = 122 in Manabi and n = 204 in Loja) and the mitochondrial cytochrome b gene (Cyt b) sequences for 174 individuals collected in the two provinces (n - 73 and - 101 in Manabi and Loja respectively). The individual samples were grouped in populations according to their community of origin. A few populations presented positive F-IS, possible due to Wahlund effect. Significant pairwise differentiation was detected between populations within each province for both genetic markers, and the isolation by distance model was significant for these populations. Microsatellite markers showed significant genetic differentiation between the populations of the two provinces. The partial sequences of the Cyt b gene (578 bp) identified a total of 34 haplotypes among 174 specimens sequenced, which translated into high haplotype diversity (Hd = 0.929). The haplotype distribution differed among provinces (significant Fisher's exact test). Overall, the genetic differentiation of R. ecuadoriensis between provinces detected in this study is consistent with the biological and phenotypic differences previously observed between Manabi and Loja populations. The current phylogenetic analysis evidenced the monophyly of the populations of R. ecuadoriensis within the R. pallescens species complex; R. pallescens and R. colombiensis were more closely related than they were to R. ecuadoriensis.
Plan de classementEntomologie médicale / Parasitologie / Virologie [052]
Descr. géo.EQUATEUR ; ANDES
LocalisationFonds IRD [F B010070290]
Identifiant IRDfdi:010070290
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010070290

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