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During the 2008-2009 rotavirus season of the Centers for Disease Control and Prevention New Vaccine Surveillance Network, one case of paediatric acute gastroenteritis associated with a rotavirus G14P[24] strain was identified. This was the first detection of the genotype G14 and P[24] in humans, and the first detection of the G14P[24] combination. To gain an insight into the origins and the evolution of this strain, we determined the complete ORF sequences of all 11 genes. A majority of the genes identified were similar to the simian strain TUCH, except for the VP1 and VP7 genes that clustered only distantly with the bovine and equine strains, respectively. In addition, this strain carried AU-1-like NSP2 and NSP4 genes. Using codon-partitioning and protein-based phylogenetic approaches, we determined that the VP7 genotype of strain 2009727118 was actually G3; therefore, the proposed full genomic classification of the 2009727118 strain is G3-P[24]-I9-R2-C3-M3-A9-N3-T3-E3-H6. These findings indicate the possibility that the 2009727118 strain originated by interspecies transmission and multiple reassortment events involving human, bovine and equine rotaviruses, resulting in the introduction of some genes into the genome of simian rotaviruses. Additionally, we found evidence of mutational saturation in the third codon position of the VP7 ORF which presented an issue with homoplasy in phylogenetic analyses.

journal of general virology

Full genome characterization of the first G3P[24] rotavirus strain detected in humans provides evidence of interspecies reassortment and mutational saturation in the VP7 gene