Molecular differentiation of Korean Newcastle disease virus (NDV) by restriction enzyme analysis and pathotype-specific RT-PCR

  • Kwon, Hyuk-Joon (Laboratory of Influenza virus Zoonotic Disease Institute (ZooDI), College of Veterinary Medicine, Seoul National University) ;
  • Cho, Sun-Hee (College of Veterinary Medicine and BK21 for Veterinary Science, Seoul National University) ;
  • Kim, Sun-Joong (College of Veterinary Medicine and BK21 for Veterinary Science, Seoul National University)
  • Accepted : 2006.11.08
  • Published : 2006.12.30

Abstract

Newcastle disease virus (NDV) is a single-stranded negative sense RNA virus, which has been classified as a member of the Avulavirus genus of the Paramyxoviridae family. It is also one of the most important pathogens in the poultry industry. The glycoproteins, fusion (F) and hemagglutinin-neuraminidase (HN), determine the virulence of NDV, and the relevant molecular structures have already been determined. NDV isolates differ in terms of virulence, and at least 2 of 9 genotypes (I-IX) have been shown to co-circulate. Therefore, it is clearly important to differentiate between vaccine strains and field isolates. In vivo pathogenicity tests have been the standard protocol for some time, but molecular methods appear preferable in terms of the rapidity of diagnosis, as well as animal welfare concerns. In this study, we have designed primer sets from HN gene for phylogenetic analysis and restriction enzyme analysis, and from F gene for pathotype-specific RT-PCR. Via the combination of 2 methods, 106 Korean NDV isolates obtained from 1980 to 2005 were differentiated into vaccine strains, and virulent genotypes VI and VII. The genotype VI viruses were only rarely isolated after 1999, and genotype VII, after it was initially isolated from poultry in 1995, recurred in 2000, and then became the main NDV constituting a threat to the Korean poultry industry.

Keywords

Acknowledgement

Supported by : Korea Research Foundation

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