中国畜牧兽医 ›› 2013, Vol. 40 ›› Issue (8): 13-19.

• 生物技术 • 上一篇    下一篇

10株H9N2亚型禽流感病毒血凝素基因的序列分析

刘彦云1, 刘春国1, 王寿山1, 张超林2, 王伟2, 吕让1, 刘明1   

  1. 1. 中国农业科学院哈尔滨兽医研究所, 兽医生物技术国家重点实验室, 农业部动物流感重点开放实验室, 黑龙江哈尔滨 150001;
    2. 东北农业大学动物医学院, 黑龙江哈尔滨 150030
  • 收稿日期:2013-01-08 出版日期:2013-08-20 发布日期:2013-08-16
  • 通讯作者: 刘明 E-mail:liuming04@126.com
  • 作者简介:刘彦云(1987- ),女,河北人,硕士,研究方向:动物流感分子生物学与免疫学。
  • 基金资助:

    现代农业技术体系(CARS-43-10);农业科技研究专项(201303046)。

Sequence Analysis of the Haemagglutinin Genes of Ten H9N2 Subtype Avian Influenza Viruses

LIU Yan-yun1, LIU Chun-guo1, WANG Shou-shan1, ZHANG Chao-lin2, WANG Wei2, LV Rang1, LIU Ming1   

  1. 1. Animal Influenza Laboratory of the Ministry of Agriculture, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China;
    2. College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China
  • Received:2013-01-08 Online:2013-08-20 Published:2013-08-16

摘要: 为了解中国目前H9N2亚型禽流感病毒(avian influenza virus,AIV)血凝素(HA)基因的遗传变异情况,对中国不同地区分离的10株H9N2亚型AIV的HA基因进行扩增、克隆和测序,并对所获得的HA全序列进行同源性和遗传进化分析。结果表明,10个分离株的裂解位点均为RSSR↓GLF,符合低致病性AIV的分子特征;10个分离株有7~9个潜在糖基化位点,由于基因突变有些HA基因出现了新的糖基化位点;与参考株相比,发现了4个抗原表位的突变,这些表位的突变可能引起病毒致病性的改变;受体结合位点除198位有变异外,其他位点均较保守;6株病毒234位氨基酸均为L,具有与哺乳动物唾液酸α,2-6受体结合的特征;10个分离株HA基因与国内疫苗株的核苷酸及氨基酸序列同源性分别为90.4%~99.2%和92.2%~98.7%;10个分离株同属于欧亚谱系中的A/duck/Hong Kong/Y280/97群,但差异显著,为此本试验又将其分为4个不同的亚群。人工感染排毒试验结果表明,BJ15和NJ17分离株在鸡体内具有较强的复制能力,排毒周期较长且排毒量也较大,而S145N的漂变导致在145—147位氨基酸多出1个糖基化位点NGT,可能是分离株复制能力增强的原因。

关键词: 禽流感病毒; H9N2亚型; HA基因; 序列分析; 致病力

Abstract: In order to explore the genetic mutations of the H9N2 subtype avian influenza viruses isolated in China, the complete HA segments of the ten H9N2 subtype avian influenza viruses were amplified by PCR and the sequences were analyzed on homology and heredity evolution. The results showed that the amino acid motif of cleavage sites for all the ten viruses in the HA genes were RSSR↓GLF, which was consistent with the characterization of the low pathogenic avian influenza virus. 7 to 9 potential glycosylation sites were found in the HA genes and 4 mutations were found in the antigen epitope region of the HA genes of the viruses. The receptor binding sites were relatively conservative except that of 198 site and the leucine at the amino acid position 234 in the HA genes of six isolates indicated the potential of binding with SAα, 2-6 receptor of mammals. The results indicated that the HA genes of the 10 viruses and the vaccine strains displayed nucleotide homologies ranging from 90.4% to 99.2% and amino acid homologies ranging from 92.2% to 98.7%, respectively. They belonged to a branch of the A/duck/Hong Kong/Y280/97 in the phylogenetic tree. The SPF chickens infected respectively by BJ15 and NJ17 isolates shed more virus and last for a longer time. The new occurring potential glycoprotein site NGT in the HA protein of BJ15 and NJ17 isolates might cause the enhancing pathogenicity.

Key words: avian influenza virus; H9N2 subtype; HA gene; sequence analysis; pathogenicity

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