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© 2010 Ty Hang et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Ty Hang VT, Holmes EC, Veasna D, Quy NT, Tinh Hien T, et al. (2010) 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. PLoS Negl Trop Dis 4(7): e757. doi:10.1371/journal.pntd.0000757

Abstract

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.

Details

Title
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
Author
Hang, Vu ThiTy; Holmes, Edward C; Veasna, Duong; Quy, Nguyen Thien; Hien, Tran Tinh; Quail, Michael; Churcher, Carol; Parkhill, Julian; Cardosa, Jane; Farrar, Jeremy; Wills, Bridget; Lennon, Niall J; Birren, Bruce W; Buchy, Philippe; Henn, Matthew R; Simmons, Cameron P
Pages
e757
Section
Research Article
Publication year
2010
Publication date
Jul 2010
Publisher
Public Library of Science
ISSN
19352727
e-ISSN
19352735
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
1288099623
Copyright
© 2010 Ty Hang et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Ty Hang VT, Holmes EC, Veasna D, Quy NT, Tinh Hien T, et al. (2010) 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. PLoS Negl Trop Dis 4(7): e757. doi:10.1371/journal.pntd.0000757