Full genotype constellations analysis of unusual DS-1-like G12P[6] and G6P[8] rotavirus strains detected in Brazil, 2019

Meylin Bautista Gutierrez; Rosane Maria Santos de Assis; Ighor Arantes; Tulio Machado Fumian

doi:10.1016/j.virol.2022.10.010

Full genotype constellations analysis of unusual DS-1-like G12P[6] and G6P[8] rotavirus strains detected in Brazil, 2019

Virology. 2022 Dec:577:74-83. doi: 10.1016/j.virol.2022.10.010. Epub 2022 Oct 27.

Authors

Meylin Bautista Gutierrez¹, Rosane Maria Santos de Assis¹, Ighor Arantes², Tulio Machado Fumian³

Affiliations

¹ Laboratory of Comparative and Environmental Virology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (Fiocruz), Av. Brasil, 4365, Rio de Janeiro, RJ 21040-360, Brazil.
² Laboratory of Respiratory Viruses and Measles, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (Fiocruz), Av. Brasil, 4365, Rio de Janeiro, RJ 21040-360, Brazil.
³ Laboratory of Comparative and Environmental Virology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (Fiocruz), Av. Brasil, 4365, Rio de Janeiro, RJ 21040-360, Brazil. Electronic address: tuliomf@ioc.fiocruz.br.

PMID: 36323046
DOI: 10.1016/j.virol.2022.10.010

Abstract

Rotavirus A (RVA) is a major cause of acute gastroenteritis (AGE) in children worldwide. We report unusual RVA G12P[6] and G6P[8] strains isolated from fecal samples from Brazilian children hospitalized for AGE. The characterized RVA have genome segments backbone: G12-P[6]/ G6-P[8]-I2-R2-C2-M2-A2-N2-T2-E2-H2 of DS-1-like genogroup. Our study describes the first identification of G6P[8], a DS-1-like genogroup strain. Nucleotide analysis of VP7 and VP4 genes revealed that all G12 Brazilian strains clustered into the sub-lineages IIIB, mostly associated with P[6] lineage I. Additionally, our G6 lineage I strains were closely related to German G6 genotypes, bound with P[8] lineage III, differing from both vaccine strains. The comparative sequence analysis of our strains with vaccine strains revealed amino acid substitutions located in immunodominant regions of VP7 and VP4 proteins. Continuous monitoring of RVA genotypes is essential to evaluate the impact of vaccination on the dynamic nature of RVA evolution.

Keywords: Brazil; Children; Constellations; Epitope; Rotavirus; Unusual genotypes; Vaccine.