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Genetic polymorphism of the nsp2 gene in North American type-Porcine reproductive and respiratory syndrome virus

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Abstract

We determined the complete nucleotide sequence of EDRD-1, a Japanese strain of the North American type-Porcine reproductive and respiratory syndrome virus (PRRSV), and identified a novel 117-base deletion and 108-base insertion previously reported in the nsp2 gene of the SP strain, which contains the largest genome among PRRSV strains. Based on genetic analysis of the partial nsp2 gene in 30 additional Japanese isolates and 50 strains from various countries, we classified North American-type PRRSVs into three nsp2-types, represented by EDRD-1, which contains the 117-base deletion and 108-base insertion; prototypic VR-2332, which does not contain the deletion and insertion; and SP, which contains only the 108-base insertion. The three nsp2-types were phylogenetically separated, suggesting that these structural changes only occurred at earlier stages of viral evolution. In the nsp2 genes, we identified an additional 19 deletions ranging from 3 to 378 bases and 2 insertions of 3 and 21 bases which were not common within each nsp2-type, suggesting that these changes occurred at later stages of viral evolution. In addition, our results suggest that the three nsp2-types can be rapidly differentiated by RT-PCR using their polymorphisms as natural tags.

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Acknowledgments

We thank Dr. H. Kuwahara, Nippon Institute for Biological Science, and Dr. T. Saito, Tochigi Livestock Hygiene Service Center, for providing Japanese isolates Gu922 M and Jtg1, respectively. We also thank Dr. Y. Murakami, National Institute of Animal Health, for providing the EDRD-1 strain and the lung homogenate from which it had been isolated. We also thank Dr. Y. Kaku, National Institute of Health, and Dr. T. Sekizaki, Dr. M. Osaki, and Dr. I. Yamane, National Institute of Animal Health, and Dr. K. Tamura, Tokyo Metropolitan University, and Dr. N. Saito, National Institute of Genetics, for their helpful suggestion.

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Correspondence to Masaaki Yoshii.

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The GenBank/EMBL/DDBJ accession numbers of the sequences reported in this paper are AB288110–AB288139 and AB288356.

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705_2008_98_MOESM1_ESM.ppt

Amino acid alignment of the three nsp2-types in nsp2. Dots and hyphens represent identical amino acids and gapped positions, respectively. B-cell epitopes identified in NVSL97-7895 [1] and BJ-4 strains [2] are underlined. Shaded areas represent positions of possible deletion ranges. a Alignment of nsp2 aa positions 423-866 (based on the SP strain) in 31 Japanese isolates and 50 strains from other countries. b Alignment of nsp2 aa 297-444 (based on the SP strain) in Jnt1 and representative strains. (PPT 62 kb).

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Yoshii, M., Okinaga, T., Miyazaki, A. et al. Genetic polymorphism of the nsp2 gene in North American type-Porcine reproductive and respiratory syndrome virus . Arch Virol 153, 1323–1334 (2008). https://doi.org/10.1007/s00705-008-0098-6

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  • DOI: https://doi.org/10.1007/s00705-008-0098-6

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