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  • Title: Whole genomic analysis of bovine group A rotavirus strains A5-10 and A5-13 provides evidence for close evolutionary relationship with human rotaviruses.
    Author: Komoto S, Pongsuwanna Y, Tacharoenmuang R, Guntapong R, Ide T, Higo-Moriguchi K, Tsuji T, Yoshikawa T, Taniguchi K.
    Journal: Vet Microbiol; 2016 Nov 15; 195():37-57. PubMed ID: 27771069.
    Abstract:
    Bovine group A rotavirus (RVA) is an important cause of acute diarrhea in calves worldwide. In order to obtain precise information on the origin and evolutionary dynamics of bovine RVA strains, we determined and analyzed the complete nucleotide sequences of the whole genomes of six archival bovine RVA strains; four Thai strains (RVA/Cow-tc/THA/A5-10/1988/G8P[1], RVA/Cow-tc/THA/A5-13/1988/G8P[1], RVA/Cow-tc/THA/61A/1989/G10P[5], and RVA/Cow-tc/THA/A44/1989/G10P[11]), one American strain (RVA/Cow-tc/USA/B223/1983/G10P[11]), and one Japanese strain (RVA/Cow-tc/JPN/KK3/1983/G10P[11]). On whole genomic analysis, the 11 gene segments of strains A5-10, A5-13, 61A, A44, B223, and KK3 were found to be considerably genetically diverse, but to share a conserved non-G/P genotype constellation except for the NSP1 gene (I2-R2-C2-M2-(A3/11/13/14)-N2-T6-E2-H3), which is commonly found in RVA strains from artiodactyls such as cattle. Furthermore, phylogenetic analysis revealed that most genes of the six strains were genetically related to bovine and bovine-like strains. Of note is that the VP1, VP3, and NSP2 genes of strains A5-10 and A5-13 exhibited a closer relationship with the cognate genes of human DS-1-like strains than those of other RVA strains. Furthermore, the VP6 genes of strains A5-10 and A5-13 appeared to be equally related to both human DS-1-like and bovine strains. Thus, strains A5-10 and A5-13 were suggested to be derived from the same evolutionary origin as human DS-1-like strains, and were assumed to be examples of bovine RVA strains that provide direct evidence for a close evolutionary relationship between bovine and human DS-1-like strains. Our findings will provide important insights into the origin of bovine RVA strains, and into evolutionary links between bovine and human RVA strains.
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