›› 2018, Vol. 45 ›› Issue (2): 310-319.doi: 10.16431/j.cnki.1671-7236.2018.02.004

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Isolation, Identification and Genetic Analysis of HA and NA Genes of H1N6 Subtype Avian Influenza Virus

XIONG Wenjie1, XIE Zhixun2, LI Meng2, CAO Guomin3, QIN Hai1, YAN Xiaodong1   

  1. 1. Fangchenggang Center for Animal Disease Control and Prevention, Fangchenggang 538001, China;
    2. Guangxi Key Laboratory of Veterinary Biotechnology, Guangxi Veterinary Research Institute, Nanning 530001, China;
    3. Fangchenggang Animal Husbandry Station, Fangchenggang 538001, China
  • Received:2017-06-19 Online:2018-02-20 Published:2018-02-10

Abstract:

In order to understand the epidemic situation of avian influenza virus (AIV) in Sino-Vietnamese border Guangxi, we carried out surveillance of avian influenza in the live poultry market in this region. A strain of H1N6 subtype AIV A/Duck/Guangxi/F01/2016 was isolated from live-bird market in Guangxi-Vietnam border areas. HA and NA genes were sequenced and the genetic analysis of isolate was made with other sequences available in GenBank. The results indicated that HA gene showed 96.9% nucleotide homology with A/sparrow/Guangxi/GXs-1/2012(H1N2), and NA gene showed 98.2% nucleotide homology with A/Pavo cristatus/Jiangxi/JA1/2016(H5N6). The sequence analysis of HA gene showed that the virus was categorized as low pathogenic AIV, with the typical HA gene cleavage site of PSIQSR↓GLF. As the same with other N6 isolates, there were 11 amino acids missing. In addition, the receptor affinity of the isolate was also tested in this study. The result showed that the virus preferentially bind to the sialic acid α-2,3-Gal receptor. These data indicated that A/Duck/Guangxi/F01/2016 could be low pathogenic AIV and recombinant from different subtype of AIV.

Key words: avian influenza virus (AIV); H1N6 subtype; sequence analysis

CLC Number: