Article thumbnail
Location of Repository

Gene Flow, Subspecies Composition, and Dengue Virus-2 Susceptibility among Aedes aegypti Collections in Senegal

By Massamba Sylla, Christopher Bosio, Ludmel Urdaneta-Marquez, Mady Ndiaye and William C. Black

Abstract

We conducted a population genetic study with 1,040 Aedes aegypti sensu latu (s.l.) collected from 19 sites distributed across the five phytogeographic regions of Senegal. Adult mosquitoes without pale scales on their first abdominal tergite were classified as Aedes aegypti formosus (Aaf) and those having pale scales as Aedes aegypti aegypti (Aaa). We found the two forms distributed along a northwest–southeast cline. Northern Sahelian collections contained only Aaa while the southern Forest gallery collections consisted of only Aaf. The two subspecies were sympatric in four collections north of The Gambia. Aaa was a minor component of two collections from the Forest gallery area. Eleven of these collections were fed a dengue-2 virus–infected bloodmeal. Consistent with the early literature, Aaf had lower vector competence than Aaa. In agreement with a recently published isozyme gene flow study in Senegal, analyzes of allele frequencies indicated only a small, nonsignificant percentage of the variance associated with subspecies. These results improve our understanding of the global phylogeny of Aedes aegypti s.l., suggesting that West African Aaa and Aaf are monophyletic and that Aaf, the black “sylvan” species, is the ancestor of Aaa, the lighter “domestic” species in West Africa

Topics: Research Article
Publisher: Public Library of Science
OAI identifier: oai:pubmedcentral.nih.gov:2663788
Provided by: PubMed Central

Suggested articles

Citations

  1. (1960). A preliminary study of the genetics of abdominal color variations in
  2. (1975). Demonstration of Differential Domesticity of Aedes-Aegypti (L) (Diptera, Culicidae) in Africa by Mark Release Recapture.
  3. (1994). Dengue - the Risk to Developed and Developing-Countries.
  4. (2006). Denque prevention and 35 years of vector control in Singapore.
  5. (1990). Genetic-Analysis of Rock Hole and Domestic Aedes-Aegypti on the Caribbean Island of Anguilla.
  6. (1984). Genetic-Heterogeneity among Caribbean Populations of Aedes-Aegypti.
  7. (1957). Genetical aspects of the Aedes aegypti problem, I. Taxonomy and bionomics.
  8. (1978). Genetics of House-Entering Behavior in EastAfrican Populations of Aedes-Aegypti (L) (Diptera-Culicidae) and Its Relevance to Speciation.
  9. (1979). Hybridization and Mating-Behavior in
  10. (1985). Oral Infection of Aedes-aegypti with Yellow-Fever Virus - Geographic-Variation and Genetic Considerations.
  11. (1999). Oral receptivity of Aedes aegypti formosus from Franceville (Gabon, Central Africa) for dengue type 2 virus.
  12. (1985). Selection for Susceptibility and Refractoriness of Aedes-Aegypti to Oral Infection with Yellow-Fever Virus.
  13. (1967). Taxonomy of Aedes aegypti and Related Species.
  14. (2007). The burden of dengue infection.
  15. (1984). The Effect of Colonization Upon Aedes-Aegypti - Susceptibility to Oral Infection with YellowFever Virus.
  16. (1989). Urban Yellow-Fever Epidemic in
  17. (1974). Worldwide Survey of Variation in
  18. (1996). Yellow fever - A decade of reemergence.
  19. (2004). Yellow fever: The recurring plague.
  20. (1998). Yellow fever. WHO/EPI/GEN/98.11. Geneva: World Health Organization.

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.