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Molecular characterization of a rare G9P[23] porcine rotavirus isolate from China

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Abstract

The fifth most important G genotype, G9 rotavirus, is recognized as an emerging genotype that is spreading around the world. Sequence analysis was completed of a rare group A rotavirus, strain G9P[23], that was designated rotavirus A pig/China/NMTL/2008/G9P[23] and abbreviated as NMTL. It was isolated from a piglet with diarrhea in China. Nucleotide sequence analysis revealed that the VP7 gene clustered within the G9 lineage VId. The VP4 gene clustered within the rare P[23] genotype. NMTL is the first porcine G9 stain reported in China. Thus, to further characterize the evolutionary diversity of the NMTL strain, all gene segments were used to draw a phylogenetic tree. Based on the new classification system of rotaviruses, the NMTL sequence revealed a G9–P[23]–I5–R1–C1–M1–A8–N1–T1–E1–H1 genotype with close similarity to human Wa-like and porcine strains. The results showed that (i) NSP2 and NSP4 genes of NMTL exhibited higher genetic relatedness to human group A rotaviruses than to porcine strains, (ii) the VP2 and VP4 genes clustered with porcine and porcine-like human strains, and (iii) VP1 genes clustered apart from the Wa-like human and porcine clusters. In view of rotavirus evolution, this report provides additional evidence to support the notion that the human and porcine rotavirus genomes might be related.

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Acknowledgments

We appreciate the help of professor Jelle Matthijnssens at Rega Institute for Medical Research in Belgium for the classification of NMTL genotypes. This work was supported by a grant from the National Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, the Chinese Academy of Agricultural Sciences.

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Correspondence to Li Feng.

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Fig. 1 Phylogenetic analysis of the VP7 nt sequences of strain NMTL (JF781163), indicating its genetic relationship to lineage-VI G9 strains. The tree was rooted with the OSU (G5) strain as outgroup. Abbreviations used for sequence analysis are as follows: hum, human; por, porcine; and out, outgroup.

Fig. 2 Phylogenetic analysis of the VP6 nt sequences of strain NMTL (JF781162), indicating itsgenetic relationship to strains representing the 10 I-genotypes. Abbreviations used for sequence analysis are as follows: hum, human; por, porcine; avi, avian; mur, murine; sim, simian; ovi, ovine; and equ, equine.

Fig. 3 Phylogenetic analysis of the VP1 nt sequences of strain NMTL (JF781158), indicating its genetic relationship to strains representing the four R-genotypes. Abbreviations used for sequence analysis are as follows: hum, human; por, porcine; avi, avian; sim, simian; and bov, bovine.

Fig. 4 Phylogenetic analysis of the VP3 nt sequences of strain NMTL (JF781160), indicating its genetic relationship to strains representing the six M-genotypes. Abbreviations used for sequence analysis are as follows: hum, human; por, porcine; avi, avian; sim, simian; ovi, ovine; and equ, equine.

Fig. 5 Phylogenetic analysis of the NSP1 nt sequences of strain NMTL (JF781164), indicating its genetic relationship to strains representing the 14 A-genotypes. Abbreviations used for sequence analysis are as follows: hum, human; por, porcine; avi, avian; mur, murine; sim, simian; ovi, ovine; equ, equine; and bov, bovine.

Fig. 6 Phylogenetic analysis of the NSP3 nt sequences of strain NMTL (JF781166), indicating its genetic relationship to strains representing the six T-genotypes. Abbreviations used for sequence analysis are as follows: hum, human; por, porcine; avi, avian; and sim, simian.

Fig. 7 Phylogenetic analysis of the NSP5 nt sequences of strain NMTL (JF781168), indicating its genetic relationship to strains representing the six H-genotypes. Abbreviations used for sequence analysis are as follows: hum, human; por, porcine; avi, avian; sim, simian; ovi, ovine; and bov, bovine.

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Shi, H., Chen, J., Li, H. et al. Molecular characterization of a rare G9P[23] porcine rotavirus isolate from China. Arch Virol 157, 1897–1903 (2012). https://doi.org/10.1007/s00705-012-1363-2

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  • DOI: https://doi.org/10.1007/s00705-012-1363-2

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