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PLoS Negl Trop Dis DOI:10.1371/journal.pntd.0000757

Emergence of the Asian 1 genotype of dengue virus serotype 2 in viet nam: in vivo fitness advantage and lineage replacement in South-East Asia.

Publication TypeJournal Article
Year of Publication2010
AuthorsVu, TTy Hang, Holmes, EC, Duong, V, Nguyen, TQuy, Tran, THien, Quail, M, Churcher, C, Parkhill, J, Cardosa, J, Farrar, J, Wills, B, Lennon, NJ, Birren, BW, Buchy, P, Henn, MR, Simmons, CP
JournalPLoS Negl Trop Dis
Date Published2010 Jul 20
KeywordsAdolescent, Asia, Southeastern, Child, Child, Preschool, Dengue, Dengue Virus, Female, Genetic Variation, Genome, Viral, Genotype, Humans, Male, Molecular Epidemiology, RNA, Viral, Sequence Analysis, DNA, Viral Envelope Proteins, Viremia

A better description of the extent and structure of genetic diversity in dengue virus (DENV) in endemic settings is central to its eventual control. To this end we determined the complete coding region sequence of 187 DENV-2 genomes and 68 E genes from viruses sampled from Vietnamese patients between 1995 and 2009. Strikingly, an episode of genotype replacement was observed, with Asian 1 lineage viruses entirely displacing the previously dominant Asian/American lineage viruses. This genotype replacement event also seems to have occurred within DENV-2 in Thailand and Cambodia, suggestive of a major difference in viral fitness. To determine the cause of this major evolutionary event we compared both the infectivity of the Asian 1 and Asian/American genotypes in mosquitoes and their viraemia levels in humans. Although there was little difference in infectivity in mosquitoes, we observed significantly higher plasma viraemia levels in paediatric patients infected with Asian 1 lineage viruses relative to Asian/American viruses, a phenotype that is predicted to result in a higher probability of human-to-mosquito transmission. These results provide a mechanistic basis to a marked change in the genetic structure of DENV-2 and more broadly underscore that an understanding of DENV evolutionary dynamics can inform the development of vaccines and anti-viral drugs.


Alternate JournalPLoS Negl Trop Dis
PubMed ID20651932
PubMed Central IDPMC2907417
Grant List084368 / / Wellcome Trust / United Kingdom
HHSN272200900006C / AI / NIAID NIH HHS / United States
HHSN272200900006C / / PHS HHS / United States
HHSN266200400001C / AO / NIAID NIH HHS / United States
HHSN266200400001C / / PHS HHS / United States
/ / Wellcome Trust / United Kingdom