Population genomics reveals that an anthropophilic population of Aedes aegypti mosquitoes in West Africa recently gave rise to American and Asian populations of this major disease vector

BMC Biology

Research Article

Arnab Pain¹  Jonathan P. Day²  William J. Palmer²  Francis M. Jiggins²  Joel M. Alves³  Jacob E. Crawford⁴  William C. Black⁵  Massamba Sylla⁵  Ranjan Ramasamy⁶  Sinnathamby N. Surendran⁷ 

[1] Biological and Environmental Sciences and Engineering Division, KAUST, Thuwal, Kingdom of Saudi Arabia;Department of Genetics, University of Cambridge, Downing Street, CB2 3EH, Cambridge, UK;Department of Genetics, University of Cambridge, Downing Street, CB2 3EH, Cambridge, UK;CIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Campus Agrário de Vairão, Universidade do Porto, 4485-661, Vairão, Portugal;Department of Integrative Biology, University of California, 94720-3140, Berkeley, CA, USA;Present Address: Verily Life Sciences, 94080, South San Francisco, CA, USA;Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, USA;ID-FISH Technology, 94303, Palo Alto, CA, USA;ID-FISH Technology, 94303, Palo Alto, CA, USA;Department of Zoology, University of Jaffna, Jaffna, Sri Lanka;

关键词: Aedes aegypti;    Anthropophilic;    Dengue virus;    Zika virus;    Arboviral diseases;    Mosquito evolution;    Vector-borne diseases;   

DOI  :  10.1186/s12915-017-0351-0

 received in 2016-09-06, accepted in 2017-01-19,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundThe mosquito Aedes aegypti is the main vector of dengue, Zika, chikungunya and yellow fever viruses. This major disease vector is thought to have arisen when the African subspecies Ae. aegypti formosus evolved from being zoophilic and living in forest habitats into a form that specialises on humans and resides near human population centres. The resulting domestic subspecies, Ae. aegypti aegypti, is found throughout the tropics and largely blood-feeds on humans.ResultsTo understand this transition, we have sequenced the exomes of mosquitoes collected from five populations from around the world. We found that Ae. aegypti specimens from an urban population in Senegal in West Africa were more closely related to populations in Mexico and Sri Lanka than they were to a nearby forest population. We estimate that the populations in Senegal and Mexico split just a few hundred years ago, and we found no evidence of Ae. aegypti aegypti mosquitoes migrating back to Africa from elsewhere in the tropics. The out-of-Africa migration was accompanied by a dramatic reduction in effective population size, resulting in a loss of genetic diversity and rare genetic variants.ConclusionsWe conclude that a domestic population of Ae. aegypti in Senegal and domestic populations on other continents are more closely related to each other than to other African populations. This suggests that an ancestral population of Ae. aegypti evolved to become a human specialist in Africa, giving rise to the subspecies Ae. aegypti aegypti. The descendants of this population are still found in West Africa today, and the rest of the world was colonised when mosquitoes from this population migrated out of Africa. This is the first report of an African population of Ae. aegypti aegypti mosquitoes that is closely related to Asian and American populations. As the two subspecies differ in their ability to vector disease, their existence side by side in West Africa may have important implications for disease transmission.

【 授权许可】

CC BY   
© Jiggins et al. 2017