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© Research
Publication : Emerging microbes & infections

Potential role of vector-mediated natural selection in dengue virus genotype/lineage replacements in two epidemiologically contrasted settings.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Emerging microbes & infections - 01 Dec 2021

O'Connor O, Ou TP, Aubry F, Dabo S, Russet S, Girault D, In S, Minier M, Lequime S, Hoem T, Boyer S, Dussart P, Pocquet N, Burtet-Sarramegna V, Lambrechts L, Duong V, Dupont-Rouzeyrol M,

Link to Pubmed [PMID] – 34139961

Link to DOI – 10.1080/22221751.2021.1944789

Emerg Microbes Infect 2021 Dec; 10(1): 1346-1357

Dengue virus (DENV) evolutionary dynamics are characterized by frequent DENV genotype/lineage replacements, potentially associated with changes in disease severity and human immunity. New Caledonia (NC) and Cambodia, two contrasted epidemiological settings, respectively experienced a DENV-1 genotype IV to I replacement in 2012 and a DENV-1 genotype I lineage 3-4 replacement in 2005-2007, both followed by a massive dengue outbreak. However, their underlying evolutionary drivers have not been elucidated. Here, we tested the hypothesis that these genotype/lineage switches reflected a higher transmission fitness of the replacing DENV genotype/lineage in the mosquito vector using in vivo competition experiments. For this purpose, field-derived Aedes aegypti from NC and Cambodia were orally challenged with epidemiologically relevant pairs of four DENV-1 genotype I and IV strains from NC or four DENV-1 genotype I lineage 3 and 4 strains from Cambodia, respectively. The relative transmission fitness of each DENV-1 genotype/lineage was measured by quantitative RT-PCR for infection, dissemination, and transmission rates. Results showed a clear transmission fitness advantage of the replacing DENV-1 genotype I from NC within the vector. A similar but more subtle pattern was observed for the DENV-1 lineage 4 replacement in Cambodia. Our results support the hypothesis that vector-driven selection contributed to the DENV-1 genotype/lineage replacements in these two contrasted epidemiological settings, and reinforce the idea that natural selection taking place within the mosquito vector plays an important role in DENV short-term evolutionary dynamics.

https://pubmed.ncbi.nlm.nih.gov/34139961