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01-08-2016 | Original Article

Population genomics of dengue virus serotype 4: insights into genetic structure and evolution

Authors: Vaishali P. Waman, Sunitha Manjari Kasibhatla, Mohan M. Kale, Urmila Kulkarni-Kale

Published in: Archives of Virology | Issue 8/2016

Abstract

The spread of dengue disease has become a global public health concern. Dengue is caused by dengue virus, which is a mosquito-borne arbovirus of the genus Flavivirus, family Flaviviridae. There are four dengue virus serotypes (1-4), each of which is known to trigger mild to severe disease. Dengue virus serotype 4 (DENV-4) has four genotypes and is increasingly being reported to be re-emerging in various parts of the world. Therefore, the population structure and factors shaping the evolution of DENV-4 strains across the world were studied using genome-based population genetic, phylogenetic and selection pressure analysis methods. The population genomics study helped to reveal the spatiotemporal structure of the DENV-4 population and its primary division into two spatially distinct clusters: American and Asian. These spatial clusters show further time-dependent subdivisions within genotypes I and II. Thus, the DENV-4 population is observed to be stratified into eight genetically distinct lineages, two of which are formed by American strains and six of which are formed by Asian strains. Episodic positive selection was observed in the structural (E) and non-structural (NS2A and NS3) genes, which appears to be responsible for diversification of Asian lineages in general and that of modern lineages of genotype I and II in particular. In summary, the global DENV-4 population is stratified into eight genetically distinct lineages, in a spatiotemporal manner with limited recombination. The significant role of adaptive evolution in causing diversification of DENV-4 lineages is discussed. The evolution of DENV-4 appears to be governed by interplay between spatiotemporal distribution, episodic positive selection and intra/inter-genotype recombination.

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Title: Population genomics of dengue virus serotype 4: insights into genetic structure and evolution
Authors: Vaishali P. Waman
Sunitha Manjari Kasibhatla
Mohan M. Kale
Urmila Kulkarni-Kale
Publication date: 01-08-2016
Publisher: Springer Vienna
Published in: Archives of Virology / Issue 8/2016
Print ISSN: 0304-8608
Electronic ISSN: 1432-8798
DOI: https://doi.org/10.1007/s00705-016-2886-8

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