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  • Title: Complete genome analysis of a rare G12P[6] rotavirus isolated in Thailand in 2012 reveals a prototype strain of DS-1-like constellation.
    Author: Saikruang W, Khamrin P, Malasao R, Kumthip K, Ushijima H, Maneekarn N.
    Journal: Virus Res; 2016 Sep 15; 224():38-45. PubMed ID: 27565028.
    Abstract:
    Species A rotaviruses (RVAs) are a major cause of severe diarrhea in children worldwide. G12 RVA detection is currently increasing and has been reported from many countries around the world. However, few studies have reported whole genome sequences of G12 RVAs. In the present study, the complete genome sequence of a G12P[6] RVA strain (RVA/Human-wt/THA/CMHN49-12/2012/G12P[6]) detected in a stool sample from a child with acute gastroenteritis in 2012 in Thailand was analyzed. In the CMHN49-12 strain, all genome segments had a DS-1-like backbone: G12-P[6]-I2-R2-C2-M2-A2-N2-T2-E2-H2 indicates that it is most likely the prototype strain of G12P[6] with a DS-1-like genotype constellation. Based on a Bayesian evolutionary analysis of VP7 nucleotide sequence, G12 RVA strains reported previously from Thailand during the period of 2007-2012 could be divided into 3 clusters, indicating that they originated from at least 3 different ancestral G12 strains. The evolutionary rate of G12 calculated by Bayesian Markov Chain Monte Carlo analysis indicated that the nucleotide substitution rate of G12 was 1.11×10(-3) mutations/site/year. The finding of a G12P[6] RVA possessing a DS-1-like backbone provides insights into the evolution of global G12 RVAs.
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