Journal
JOURNAL OF GENERAL VIROLOGY
Volume 99, Issue 8, Pages 1044-1057Publisher
MICROBIOLOGY SOC
DOI: 10.1099/jgv.0.001092
Keywords
Dengue virus; NS4B; variants
Categories
Funding
- Japan Initiative for Global Research Network on Infectious Diseases (JGRID) of the Japan Science and Technology Agency (JST) [JP18FM0108001]
- e-Asia Joint Research Program (e-Asia JRP)
- Research Program on Emerging and Re-emerging Infectious Diseases of the Agency for Research and Development (AMED)
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Dengue virus (DENV) replication between mosquito and human hosts is hypothesized to be associated with viral determinants that interact in a differential manner between hosts. However, the understanding of inter-host viral determinants that drive DENV replication and growth between hosts is limited. Through the use of clinical isolates, we identified an amino acid variation of Ala, Met and Val at position 116 of DENV-1 NS4B. While the proportion of virus with the NS4B-116V variant remained constantly high in serial passages in a mosquito cell line, populations of the NS4B-116M and NS4B-116A variants became dominant after serial passages in mammalian cell lines. Using recombinant DENV-1 viruses, the Val to Ala or Met alteration at position NS4B-116 (rDENV-1-NS4B-116A and rDENV-1-NS4B-116M) resulted in enhanced virus growth in human cells in comparison to the clone with Val at NS4B-116 (rDENV-1-NS4B-116V). However, the reverse phenomenon was observed in a mosquito cell line. Additionally, in a human cell line, differential levels of IFN-alpha/beta and IFN-stimulated gene expressions (IFIT3, IF144L, OAS1) suggested that the enhanced viral growth was dependent on the ability of the NS4B protein to hamper host IFN response during the early phase of infection. Overall, we identified a novel and critical viral determinant at the pTMD3 of NS4B region that displayed differential effects on DENV replication and fitness in human and mosquito cell lines. Taken together, the results suggest the importance of the NS4B protein in virus replication and adaptation between hosts.
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