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Molecular Evolution of the RNA-Dependent RNA Polymerase and Capsid Genes of Human Norovirus Genotype GII.2 in Japan during 2004-2015.


ABSTRACT: The RNA-dependent RNA polymerase (RdRp) and capsid (VP1) genes of 51 GII.2 human norovirus (HuNoV) strains collected during the period of 2004-2015 in Japan were analyzed. Full-length analyses of the genes were performed using next-generation sequencing. Based on the gene sequences, we constructed the time-scale evolutionary trees by Bayesian Markov chain Monte Carlo methods. Time-scale phylogenies showed that the RdRp and VP1 genes evolved uniquely and independently. Four genotypes of GII.2 (major types: GII.P2-GII.2 and GII.P16-GII.2) were detected. A common ancestor of the GII.2 VP1 gene existed until about 1956. The evolutionary rates of the genes were high (over 10-3 substitutions/site/year). Moreover, the VP1 gene evolution may depend on the RdRp gene. Based on these results, we hypothesized that transfer of the RdRp gene accelerated the VP1 gene evolution of HuNoV genotype GII.2. Consequently, recombination between ORF1 (polymerase) and ORF2 (capsid) might promote changes of GII.2 antigenicity.

SUBMITTER: Mizukoshi F 

PROVIDER: S-EPMC5403926 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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Molecular Evolution of the RNA-Dependent RNA Polymerase and Capsid Genes of Human Norovirus Genotype GII.2 in Japan during 2004-2015.

Mizukoshi Fuminori F   Nagasawa Koo K   Doan Yen H YH   Haga Kei K   Yoshizumi Shima S   Ueki Yo Y   Shinohara Michiyo M   Ishikawa Mariko M   Sakon Naomi N   Shigemoto Naoki N   Okamoto-Nakagawa Reiko R   Ochi Akie A   Murakami Koichi K   Ryo Akihide A   Suzuki Yoshiyuki Y   Katayama Kazuhiko K   Kimura Hirokazu H  

Frontiers in microbiology 20170425


The RNA-dependent RNA polymerase (<i>RdRp</i>) and capsid (<i>VP1</i>) genes of 51 GII.2 human norovirus (HuNoV) strains collected during the period of 2004-2015 in Japan were analyzed. Full-length analyses of the genes were performed using next-generation sequencing. Based on the gene sequences, we constructed the time-scale evolutionary trees by Bayesian Markov chain Monte Carlo methods. Time-scale phylogenies showed that the <i>RdRp</i> and <i>VP1</i> genes evolved uniquely and independently.  ...[more]

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