Detection and molecular characterization of reassortant DS-1-like G1P [8] strains of rotavirus A

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Abstract

Group A rotaviruses (RVA) are the main cause of viral gastroenteritis in children worldwide. In this study we provide the molecular characteristics of reassortant DS-1-like G1P[8] RVA strains detected in Russia for the first time. Previously, such reassortant strains were detected in Japan and Thailand. The G1P[8] RVAs with DS-1-like short electropherotype RNA-PAGE were isolated from children hospitalised with an acute gastroenteritis during the 2013-2014 period. The DS-1-like G1P[8] strains accounted for 2.6% of all RVA strains detected continuously throughout the season. A phylogenetic analysis was made on the basis of the established nucleotide sequences of genes VP7, VP8* (VP4), VP6 and NSP4. The Nizhny Novgorod strains belong to G1-I and G1-II alleles of VP7 gene and to P[8]-3 allele of VP4. According to their VP6 sequences, two Russian samples clustered with the reassortant strains isolated in Japan, Thailand and Australia and two other strains were phylogenetically close to the typical G2P[4] DS-1-like RVA. Nucleotide sequences of G1P[8] strains that belong to NSP4 gene form a separate cluster from G3P[8] DS-1-like rotaviruses detected in Thailand and Australia. The RVA alleles included in Rotarix and RotaTeq vaccine strains were clustered separately from the studied reassortant RVAs. On the grounds of phylogenetic analysis we assume a polyphyletic origin of reassortants between Wa- and DS-1-like strains. Mutation rates evaluated by Bayesian inference in clusters with reassortant RVA strains were 1.004Е-3 (VP7), 1.227E-3 (VP4), 3.909E-4 (VP6), and 4.014Е-4 (NSP4). Analysis of tMRCA showed relatively contemporary origin of alleles DS-1-like G1P[8] rotaviruses: VP7 - 1998 (G1-I) and 1981 (G1-II), VP4 - 1998, VP6 - 1994, NSP4 - 1979.

About the authors

O. V. Morozova

I.N. Blokhina Nizhny Novgorod Research Institute of Epidemiology and Microbiology; Lobachevsky State University of Nizhny Novgorod

Author for correspondence.
Email: olga.morozova.bsc@gmail.com
Russian Federation

T. A. Sashina

I.N. Blokhina Nizhny Novgorod Research Institute of Epidemiology and Microbiology

Email: noemail@neicon.ru
Russian Federation

N. A. Novikova

I.N. Blokhina Nizhny Novgorod Research Institute of Epidemiology and Microbiology; Lobachevsky State University of Nizhny Novgorod

Email: noemail@neicon.ru
Russian Federation

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Copyright (c) 2017 Morozova O.V., Sashina T.A., Novikova N.A.

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