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Soumana I. H., Berthier D., Tchicaya B., Thévenon S., Njiokou F., Cuny Gérard, Geiger Anne. (2013). Population dynamics of Glossina palpalis gambiensis symbionts, Sodalis glossinidius, and Wigglesworthia glossinidia, throughout host-fly development. Infection Genetics and Evolution, 13, 41-48. ISSN 1567-1348

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Lien direct chez l'éditeur doi:10.1016/j.meegid.2012.10.003

Titre
Population dynamics of Glossina palpalis gambiensis symbionts, Sodalis glossinidius, and Wigglesworthia glossinidia, throughout host-fly development
Année de publication2013
Type de documentArticle référencé dans le Web of Science WOS:000314902000006
AuteursSoumana I. H., Berthier D., Tchicaya B., Thévenon S., Njiokou F., Cuny Gérard, Geiger Anne.
SourceInfection Genetics and Evolution, 2013, 13, p. 41-48. ISSN 1567-1348
RésuméThe tsetse fly (Diptera: Glossinidae), the vector of trypanosomes causing human and animal trypanosomiasis, harbors symbiotic microorganisms including the primary symbiont Wigglesworthia glossinidia, involved in the fly's nutrition and fertility, and the secondary symbiont Sodalis glossinidius, involved in the trypanosome establishment in the fly's midgut Both symbionts are maternally transmitted to the intrauterine progeny through the fly's milk gland secretions. In this study, we investigated the population dynamics of these symbionts during fly development. Wigglesworthia and Sodalis densities were estimated using quantitative PCR performed on Glossina palpalis gambiensis at different developmental stages. The results showed that the density of the primary Wigglesworthia symbiont was higher than that of Sodalis for all host developmental stages. Sodalis densities remained constant in pupae, but increased significantly in adult flies. The opposite situation was observed for Wigglesworthia, whose density increased in pupae and remained constant during the female adult stage. Moreover, Wigglesworthia density increased significantly during the transition from the pupal to the teneral stage, while mating had a contradictory effect depending on the age of the fly. Finally, tsetse fly colonization by both symbionts appears as a continuous and adaptive process throughout the insect's development. Last, the study demonstrated both symbionts of G. p. gambiensis, the vector of the chronic form of human African trypanosomiasis, to be permanent inhabitants of the colony flies throughout their life span. This was expected for the primary symbiont, Wigglesworthia, but not necessarily for the secondary symbiont, S. glossinidius, whose permanent presence is not required for the fly's survival. This result is of importance as Sodalis could be involved in the tsetse fly vector competence and may constitute a target in the frame of sleeping sickness fighting strategies.
Plan de classementEntomologie médicale / Parasitologie / Virologie [052]
Descr. géo.AFRIQUE SUB SAHARIENNE ; BURKINA FASO
LocalisationFonds IRD [F B010059018]
Identifiant IRDfdi:010059018
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010059018

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