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.
journal_name
Arch Viroljournal_title
Archives of virologyauthors
Yoshii M,Okinaga T,Miyazaki A,Kato K,Ikeda H,Tsunemitsu Hdoi
10.1007/s00705-008-0098-6subject
Has Abstractpub_date
2008-01-01 00:00:00pages
1323-34issue
7eissn
0304-8608issn
1432-8798journal_volume
153pub_type
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