摘要
2012年7~9月从来源于青海湖地区活禽市场的环境样本中分离到5株H9N2亚型禽流感病毒,为了了解其基因遗传进化情况,本研究通过RT—PCR技术扩增分离毒株的8个基因片段,并进行全基因序列测定。对其分子特征及全基因序列进行遗传进化分析。结果显示5株病毒的HA基因片段的核苷酸相似度为93.2%~99.1%。NA基因核苷酸的相似度为94.5%~99.8%。A/environment/qinghai/017/2012的裂解位点为PSKSSRGLF,其它4个毒株的HA裂解位点均为PSRSSRGLF。5个病毒的HA基因第226位受体结合位点均为L。M1基因片段中发生了N30D和T215A替换。遗传进化分析表明5株病毒同2005年湖南分离的A/chicken/Hunan/5260/2005(HgN2)毒株类似,为一种重配基因型禽流感病毒。其中HA、NA、NS基因片段属于Y280-like支系,MP基因片段属于G1-like支系,NP、PBl、PB2、PA四个基因片段属于F98-like支系。
Five H9N2 avian influenza virus strains were isolated from the environmental samples in live poultry market in Qinghai Lake region from July to September, 2012. To evaluate the phylogenetic charac- teristics of these H9N2 isolates, the eight gene segments were amplified by RT-PCR and sequenced. The phylogenetic and molecular characteristics of the five strains were analyzed. The results showed that the HA genes of five strains shared 93.2%-99.1% nucleotide identities with each other, and the NA genes shared 94.5 %-99.8% nucleotide identities. The HA cleavage site sequence of the A/environment/qinghai/ 017/2012 isolate was PSKSSRGLF, and the HA cleavage site sequences of the other four strains were all PSRSSRGLF. The HA receptor-binding site had the Q226L mutation. The M1 gene segment had the N30D and T215A mutations. The phylogenetic analysis showed that the five strains were similar to the vi- rus A/chieken/Hunan/5260/2005 (H9N2) isolated in Hunan Province, China and were reassortant geno- type viruses; the HA, NA, and NS genes belonged to the Y280-1ike lineage; the MP gene belonged to the Gl-like lineage; the NP, PB1, PB2, and PA genes belonged to the F98-1ike lineage.
出处
《病毒学报》
CAS
CSCD
北大核心
2014年第2期109-118,共10页
Chinese Journal of Virology
基金
WHO 2012/2013年度加强西部省份人禽流感监测能力项目
国家重点基础研究发展973计划课题(2011CB504704)
国家自然科学基金(81373107)
关键词
H9N2
禽流感病毒
基因组
分子特征
遗传进化分析
HgN2
Avian influenza virus
Genome
Molecular characteristics
Phylogenetic analysis
作者简介
刘琳玉(1986-),女,贵州铜仁人,硕士研究生,主要从事流感病毒的研究,Tel:010—58900853,E—mail:liulinyu@cnic.org.cn;
姜双应(1960-)男,青海西宁人,大学本科,主要从事病毒的研究,Tel:0971-8801768,E-mail:jiangsy81237@163.com
汪立杰(1983-),男,安徽歙县人,硕士研究生,研究实习员,主要从事流感流行病学研究,Tel:010-58900864,E-mail:wanglijie@cnic.org.cn
通讯作者:舒跃龙(1970-),研究员,博士生导师,中国疾病预防控制中心病毒病预防控制所国家流感中心主任,Tel:010—58900850,Email:yshu@cnic.org.cn