浙江农业学报

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2013年苏皖地区4株H9N2亚型禽流感病毒HA,NA基因的遗传演化分析

  

  1. (江苏省农业科学院 兽医研究所家禽重大疫病研究项目组,江苏 南京 210014)
  • 出版日期:2015-11-25 发布日期:2015-12-05

Phylogenetic analysis of the HA and NA genes of four strains of H9N2 subtype of avian influenza virus isolated from Jiangsu and Anhui Province in 2013

  1. (Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China)
  • Online:2015-11-25 Published:2015-12-05

摘要: 为了解2013年苏皖地区H9N2亚型禽流感病毒的变异情况,选取2013年所分离的4个H9N2亚型禽流感病毒株,对其HA和NA基因进行测序,并应用DNAStar和Mega生物软件拼接序列和建立进化树。结果表明,4株H9N2的HA裂解位点氨基酸均为\|R(K)SSR/GL\|,具有典型低致病性禽流感病毒HA基因的特征;但其226 位氨基酸均为亮氨酸(L),呈现出人流感受体结合特性。4株病毒NA基因颈部均有9个核苷酸的缺失,且NA潜在糖基化位点数量不超过8个。进化树分析表明,2013年苏皖地区H9N2流行毒株HA和NA基因发生变异,且变异与时间呈现一定的相关性,与地域无关。

关键词: H9N2, HA, NA, 遗传演化分析

Abstract: To evaluate the variations of H9N2 Avian influenza virus (AIV) in Jiangsu and Anhui Province in 2013, HA and NA genes of 4 isolates of H9N2 AIV isolated in 2013 were sequenced, DNAStar and Mega software were used for phylogenetic analysis. The results showed that their cleavage site of HA were all\|R (K) SSR/GL\|, showing typical character of low pathogenic avian influenza HA gene. But, the 226th amino acid was Leucine, showing a human influenza receptor binding characteristic. The NA genes of 4 isolates had a 9 bp deletion and their potential glycosylation sites were not more than 8. It was concluded that HA and NA genes of H9N2 AIVs isolated from Jiangsu and Anhui in 2013 had intragenic mutation, which showed a certain correlation with time, but not locations.

Key words: H9N2, HA, NA, phylogenetic analysis