ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2014, Vol. 45 ›› Issue (3): 434-442.doi: 10.11843/j.issn.0366-6964.2014.03.013

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Isolation and Sequence Analysis of a Border Disease Virus from Sheep

LIU Xia1,2, MAO Li2, LI Wen-liang2, YANG Lei-lei2, ZHANG Wen-wen2, WEI Jian-zhong1*, JIANG Jie-yuan2*   

  1. (1.College of Animal Science and Technology, Anhui Agricultural University,Hefei 230036, China;2.Key Laboratory of Veterinary Biological Engineering and Technology of Ministry of Agriculture,National Center for Engineering Research of Veterinary Bio-products,Institute of Veterinary Medicine,Jiangsu Academy of Agricultural Sciences,Nanjing 210014, China)
  • Received:2013-09-04 Online:2014-03-23 Published:2014-03-23

Abstract:

In order to investigate the prevalence status of border disease,serum samples were collected from one sheep flock in east China and tested through RT-PCR method with the 5′-UTR generic primers of pestivirus.One sheep was detected as positive infection of border disease virus (BDV) at different sampling times.Positive serum sample was inoculated onto MDBK cells for viral isolation and identification.Then RT-PCR amplification of Npro gene,electron microscopy detection of isolated virus,analysis of the complete genome sequences and phylogenetic analysis of the 5′-UTR and Npro gene were performed.The results showed that no cytopathy effect (CPE) was observed until the eighth generation by serial passages.BDV was detected from cell cultures by RT-PCR using Npro gene primers; and confirmed with sequence analysis as well as electron microscopy detection.The isolate was named as JSLS12-01.Amplification of complete genomic sequence was performed with six pairs of primers covering the near-full genome.The viral genome was about 12 227 nucleotides in size and had been submitted to the GenBank with registered number KC963426.Based on comparative sequence analysis of full genome and the deduced amino acids between this isolate and BDV reference strains,there were 72.3%-80.4% and 80.1%-89.7% identities,respectively.Phylogenetic analysis using partial 5′-UTR nucleotide sequence and Npro sequence identified that the virus clustered within BDV 3 viruses,with the highest homology of 87.7% and 75.8%,respectively.Above all,we successfully isolated and identified one BDV 3 strain from sheep of the non-cytopathogenic biotype.

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