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Genetic characterization of Zika virus strains: geographic expansion of the Asian lineage.

Abstract：

BACKGROUND:Zika virus (ZIKV) is a mosquito-borne flavivirus distributed throughout much of Africa and Asia. Infection with the virus may cause acute febrile illness that clinically resembles dengue fever. A recent study indicated the existence of three geographically distinct viral lineages; however this analysis utilized only a single viral gene. Although ZIKV has been known to circulate in both Africa and Asia since at least the 1950s, little is known about the genetic relationships between geographically distinct virus strains. Moreover, the geographic origin of the strains responsible for the epidemic that occurred on Yap Island, Federated States of Micronesia in 2007, and a 2010 pediatric case in Cambodia, has not been determined. METHODOLOGY/PRINCIPAL FINDINGS:To elucidate the genetic relationships of geographically distinct ZIKV strains and the origin of the strains responsible for the 2007 outbreak on Yap Island and a 2010 Cambodian pediatric case of ZIKV infection, the nucleotide sequences of the open reading frame of five isolates from Cambodia, Malaysia, Nigeria, Uganda, and Senegal collected between 1947 and 2010 were determined. Phylogenetic analyses of these and previously published ZIKV sequences revealed the existence of two main virus lineages (African and Asian) and that the strain responsible for the Yap epidemic and the Cambodian case most likely originated in Southeast Asia. Examination of the nucleotide and amino acid sequence alignments revealed the loss of a potential glycosylation site in some of the virus strains, which may correlate with the passage history of the virus. CONCLUSIONS/SIGNIFICANCE:The basal position of the ZIKV strain isolated in Malaysia in 1966 suggests that the recent outbreak in Micronesia was initiated by a strain from Southeast Asia. Because ZIKV infection in humans produces an illness clinically similar to dengue fever and many other tropical infectious diseases, it is likely greatly misdiagnosed and underreported.

journal_name

PLoS Negl Trop Dis

journal_title

PLoS neglected tropical diseases

authors

Haddow AD,Schuh AJ,Yasuda CY,Kasper MR,Heang V,Huy R,Guzman H,Tesh RB,Weaver SC

doi

10.1371/journal.pntd.0001477

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

e1477

issue

eissn

1935-2727

issn

1935-2735

pii

PNTD-D-11-00811

journal_volume

pub_type

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Genetic characterization of Zika virus strains: geographic expansion of the Asian lineage.