中国畜牧兽医

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一株H9N2亚型禽流感病毒分离株的生物学特性研究及其全基因组序列分析

刘海玲, 胡自立, 罗开健   

  1. 华南农业大学兽医学院,农业部兽用疫苗创制重点实验室,广东广州 510642
  • 收稿日期:2012-02-09 出版日期:2012-09-20 发布日期:2012-09-18
  • 通讯作者: 罗开健。E-mail:kjluo@scau.edu.cn E-mail:kjluo@scau.edu.cn
  • 作者简介:刘海玲(1988-),女,江西人,硕士,主要从事病毒分子生物学研究。
  • 基金资助:

    农业科技成果转化资金项目(2011GB2E000005)。

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

摘要: 本试验对1株2010年从广东省分离的H9N2亚型禽流感病毒A/chicken/Guangdong/QY/2010(H9N2)的生物学特性进行研究并对其全基因组序列进行分析。结果显示,该毒株的鸡胚半数感染量 EID50为109/0.1 mL,鸡胚最小致死量的平均死亡时间MDT为104 h,脑内致病指数ICPI值为0.51,静脉致病指数IVPI为0。用RT-PCR方法扩增病毒的基因组各片段,将扩增片段进行克隆、测序并进行序列分析。结果显示,该毒株的HA基因与Ck/HK/G9/97和Dk/HK/Y280/97在同一分支上,HA的裂解位点为PARSSR↓GLF,有8个潜在糖基化位点,226位氨基酸残基为L,较保守的202位受体结合位点由L突变为P,该毒株的HA和NA核苷酸序列与Dk/HK/Y280/97同源性较高,NS、PA、PB1的核苷酸序列均与Ck/SH/F/98同源性较高,NP基因与A/VN/ 1203/04(H5N1)的核苷酸序列同源性为95.3%。

关键词: AIV; H9N2亚型; 生物学特性; 克隆; 全基因; 序列分析

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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