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Biological Characteristic and Sequence Analysis of A Strain H9N2 Subtype Avian Influenza Virus

LIU Hai-ling, HU Zi-li, LUO Kai-jian   

  1. MOA Key Laboratory for Animal Vaccine Development,College of Veterinary Medicine,South China Agricultural University, Guangzhou 510642, China
  • Received:2012-02-09 Online:2012-09-20 Published:2012-09-18

Abstract: The biological characteristic and analysis of the genome of a strain H9N2 AIV(A/chicken/Guangdong/QY/2010(H9N2))that isolated from Guangdong province in 2010 was investigated in this paper. The result indicated that EID50 was 10-9/0.1 mL, MDT was 104 hours, ICPI was 0.51, IVPI was 0; the whole eight cDNA fragments of the virus were amplified by reverse transcription polymerase chain reaction, after cloning and sequencing, gene sequences were analyzed on homology and heredity evolution, the result indicated that HA gene was located on the same branch with Ck/HK/G9/97 and Dk/HK/Y280/97 ,the cleavage site of HA gene was PARSSR↓GLF, 8 potential glycosylation were found on HA gene,the 226 site amino acid was L, the stenoplastic 226 receptor-binding site was changed from L to P, the nucleotide homology of the HA and NA gene to the Dk/HK/Y280/97 was higest, the nucleotide homology of the NS, PA, PB1 gene to the Ck/SH/F/98 was higest,the nucleotide homology of the NP gene to A/VN/1203/04(H5N1)was 95.3%.

Key words: AIV; H9N2 subtype; biological characteristic; clone; whole genome; sequence analysis

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