PMID- 17048090 OWN - NLM STAT- MEDLINE DCOM- 20070410 LR - 20081121 IS - 0006-2928 (Print) IS - 0006-2928 (Linking) VI - 44 IP - 9-10 DP - 2006 Oct TI - Genetic variation of Chinese PRRSV strains based on ORF5 sequence. PG - 425-35 AB - Thirteen isolates of porcine reproductive and respiratory syndrome virus (PRRSV) from different provinces of China were studied and compared with several PRRSV isolates from other countries. Phylogenetic analysis shows that all Chinese isolates of PRRSV in this study belong to the American genotype, except for one strain, B13, which clustered as a European genotype. Sequence analysis revealed that PRRSV Chinese isolates of the American genotype were highly similar in the ORF5 sequence and could be classified into two subclades. One contains PRRSV isolates that are more closely related to the American vaccine strain MLV Resp and its parent strain VR-2332, and the other contains ones only distantly related to them. Within the Chinese isolates slight genetic variation occurred, and some strains may originate directly from the vaccine virus. FAU - Chen, Jian AU - Chen J AD - College of Life Sciences, Zhejiang University, Hangzhou, PR China. FAU - Liu, Tao AU - Liu T FAU - Zhu, Cheng-Gang AU - Zhu CG FAU - Jin, Yong-Feng AU - Jin YF FAU - Zhang, Yao-Zhou AU - Zhang YZ LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20060919 PL - United States TA - Biochem Genet JT - Biochemical genetics JID - 0126611 RN - 0 (DNA Primers) SB - IM MH - Amino Acid Sequence MH - Base Sequence MH - DNA Primers MH - Genes, Viral MH - *Genetic Variation MH - Genotype MH - Molecular Sequence Data MH - Open Reading Frames MH - Phylogeny MH - Porcine respiratory and reproductive syndrome virus/*genetics MH - Reverse Transcriptase Polymerase Chain Reaction MH - Sequence Homology, Amino Acid EDAT- 2006/10/19 09:00 MHDA- 2007/04/11 09:00 CRDT- 2006/10/19 09:00 PHST- 2005/11/03 00:00 [received] PHST- 2006/02/21 00:00 [accepted] PHST- 2006/10/19 09:00 [pubmed] PHST- 2007/04/11 09:00 [medline] PHST- 2006/10/19 09:00 [entrez] AID - 10.1007/s10528-006-9039-9 [doi] PST - ppublish SO - Biochem Genet. 2006 Oct;44(9-10):425-35. doi: 10.1007/s10528-006-9039-9. Epub 2006 Sep 19.