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Sequence analysis of the haemagglutinin genes of H9N2 avian influenza viruses isolated in China during 1996 to 2011

文献类型： 外文期刊

作者： Dai, Yin 1 ; Wang, Junjun 2 ; Xu, Fazhi 3 ; Zhao, Ruihong 1 ; Hu, Xiaomiao 1 ; Zhang, Danjun 1 ;

作者机构： 1.Anhui Acad Agr Sci, Inst Anim Husb & Vet Sci, Hefei 230031, Peoples R China

2.Anim Husb & Vet Bur Xuancheng City, Xuancheng 242000, Peoples R China

3.Anhui Agr Univ, Coll Anim Sci & Technol, Hefei 230036, Peoples R China

关键词： Avian influenza virus;H9N2 subtype;hemagglutinin gene;sequence analysis

期刊名称：JOURNAL OF FOOD AGRICULTURE & ENVIRONMENT （ 影响因子：0.435； 五年影响因子：0.484 ）

ISSN： 1459-0255

年卷期： 2012 年 10 卷 1 期

页码：

收录情况： SCI

摘要： To understand the molecular characteristics of H9N2 avian influenza viruses (AIV), we studied 21 amino acid sequences of haemagglutinin (HA) genes, which were gained from strains in different areas of China during 1996 to 2011. There were 99 variable amino acid residues, accounting for 17.7% of all amino acids. Nine polymorphic amino acid residues (score >= 4) were observed in the chicken HA, the HA 1 domain showed higher level of mutation than the HA2 domain. Moreover, the result showed that the 3 sites (218-220, 298-300, 305-307) were variable in 7 potential glycosylation positions. There were 7 receptor-binding sites, especially the site 198 with high degree of mutation frequency located in the globular head of protein model. It revealed the site 198 might be more conducive to changing AIV virus to adapt to new hosts and to evade the body's immune system. Phylogenetic tree showed that no significant regional differentiation was found in HA amino acid sequences of strains. It indicated that geographical isolation of virus could be broken by extensive trades and migration of birds.

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