中国农业科学 ›› 2022, Vol. 55 ›› Issue (20): 4075-4090.doi: 10.3864/j.issn.0578-1752.2022.20.017
• 畜牧·兽医 • 上一篇
收稿日期:
2021-08-06
接受日期:
2022-04-07
出版日期:
2022-10-16
发布日期:
2022-10-24
通讯作者:
郭晶,李旭勇
作者简介:
王艳文,E-mail: 基金资助:
WANG YanWen(),WANG MengJing,ZHANG Hong,GAO XinXin,GUO Jing(
),LI XuYong(
)
Received:
2021-08-06
Accepted:
2022-04-07
Online:
2022-10-16
Published:
2022-10-24
Contact:
Jing GUO,XuYong LI
摘要:
【目的】 通过分析1998—2021年间我国人感染H9N2亚型禽流感病例的发病时间、所在省份、年龄和性别等信息,明确H9N2亚型禽流感病毒的流行病学特征;通过分析人源H9N2亚型禽流感病毒的基因特征,阐明人源H9N2亚型禽流感病毒的遗传演化规律;为H9N2亚型禽流感病毒跨种间传播的预警和防控提供数据支撑。【方法】 基于流感基因数据库、病例报道和文献资料,获得1998—2021年我国人感染H9N2亚型禽流感病毒的病例信息和毒株序列数据。从时间、空间、性别和年龄的分布对感染病例进行分析,明确人源H9N2亚型禽流感病毒感染的流行病学特征。通过DNASTAR中的MegAlign软件对人源H9N2病毒的各基因片段的核苷酸序列进行同源性分析,利用MEGA7.0软件构建系统进化树和分析病毒蛋白关键位点,揭示遗传演化趋势和病毒蛋白关键氨基酸位点的变异情况。通过GISAID网站下载2019—2021年间我国H9N2亚型禽流感病毒的核苷酸序列,利用mafft比对后在MEGA7.0中查看人源与禽源H9N2病毒关键氨基酸位点的突变差异,揭示当前人源和禽源H9N2病毒可能引起的风险。【结果】 1998—2021年我国人感染H9N2亚型禽流感病毒病例共71例,从空间分布分析,病例分布于16个省市,其中91.55%的病例来自于南方12个省市;从时间分布分析,2013年以后,我国报道的感染病例呈增长趋势,2013—2021年累计感染病例数占总病例数的61.97%;从性别和年龄分布分析,男、女性别比为 1﹕1.68,感染病例主要见于幼儿和少儿,占总病例的74.14%。对人源H9N2病毒进行基因组比对分析,发现这些病毒均属于欧亚分支,但是这些病毒各基因片段的核苷酸序列同源性差异较大,HA、NA、PB2、PB1、PA、NP、M和NS的同源性分别为75.3%—100%、80.1%—100%、78.7%—100%、82.5%—100%、72.6%—100%、74.1%—100%、65.5%—100%、82.0%—100%;22株具有完整基因片段的病毒分为8个基因型,2003、2008和2013年的基因型与1999年的基因型有明显差异。1998—2021年共有42株人源H9N2病毒株上传HA序列,其中有38株病毒的HA蛋白发生Q226L的突变;共有30株人源H9N2病毒株上传PB2序列,其中9株病毒的PB2蛋白发生E627V突变,1株病毒的PB2蛋白发生E627K突变;1株病毒的PB2蛋白的701位点发生D701N突变,共有31株人源H9N2病毒株上传 NS与M序列,NS1蛋白的42位点均为S,M1蛋白的30和215位点的氨基酸分别为D和A。2019-2021年人源H9N2病毒的HA蛋白183与190位点、NS1蛋白42位点均发生突变,人源与禽源H9N2病毒的PB2蛋白701位点均未发生突变。【结论】 自2013年以来,我国人感染H9N2亚型禽流感病例数量呈增长趋势,且具有显著的地域、年龄和性别差异。1998年至今,人源H9N2病毒的基因同源性差异较大,不同分支间病毒基因重排频繁,形成了复杂的基因型,提示H9N2亚型禽流感病毒在不断地进化。人源H9N2病毒的关键氨基酸位点出现突变,且在2019—2021年人源比禽源H9N2病毒的关键位点突变率高,提示H9N2亚型禽流感病毒的跨种感染人的潜力逐渐增强。该结果丰富了对人源H9N2病毒认知,为H9N2亚型禽流感病毒防控提供参考。
王艳文,王梦静,张虹,高鑫鑫,郭晶,李旭勇. 1998-2021年我国人感染H9N2亚型禽流感病毒的遗传演化规律[J]. 中国农业科学, 2022, 55(20): 4075-4090.
WANG YanWen,WANG MengJing,ZHANG Hong,GAO XinXin,GUO Jing,LI XuYong. Evolution of Human H9N2 Avian Influenza Virus in China from 1998 to 2021[J]. Scientia Agricultura Sinica, 2022, 55(20): 4075-4090.
表1
部分基因的关键位点分析"
人源H9N2分离株 Human H9N2 virus | HA | PB2 | NS1 | M1 | ||
---|---|---|---|---|---|---|
226 | 627 | 701 | 42 | 30 | 215 | |
A/Shantou/239/1998(H9N2) | Q | - | - | - | - | - |
A/Shaoguan/408/1998(H9N2) | L | - | - | - | - | - |
A/Shaoguan/447/1998(H9N2) | L | - | - | - | - | - |
A/Guangzhou/333/1999(H9N2) | M | E | D | S | D | A |
A/Hongkong/1073/1999(H9N2) | L | E | D | S | D | A |
A/Hongkong/1074/1999(H9N2) | L | E | D | S | D | A |
A/Nanchang/CH2/2000(H9N2) | L | - | - | - | - | - |
A/Nanchang/CH3/2000(H9N2) | L | - | - | - | - | - |
A/Nanchang/D1/2000(H9N2) | L | - | - | - | - | - |
A/Nanchang/D2/2000(H9N2) | L | - | - | - | - | - |
A/Hongkong/2108/2003(H9N2) | L | E | D | S | D | A |
A/Guangdong/W1/2004(H9N2) | L | E | D | S | D | A |
A/Hongkong/3239/2008(H9N2) | L | E | D | S | D | A |
A/Hongkong/69955/2008(H9N2) | L | - | - | - | - | - |
A/Hongkong/33982/2009(H9N2) | Q | E | N | S | D | A |
A/Hongkong/35820/2009(H9N2) | Q | - | - | S | D | A |
A/Lengshuitan/11197/2013(H9N2) | L | E | D | S | D | A |
A/Guangdong/167/2014(H9N2) | - | E | D | S | D | A |
A/Guangdong/79/2015(H9N2) | - | E | D | S | D | A |
A/Hunan/44557/2015(H9N2) | L | E | D | S | D | A |
A/Hunan/44558/2015(H9N2) | L | E | D | S | D | A |
A/Zhongshan/201501/2015(H9N2) | L | E | D | S | D | A |
A/Beijing/1/2016(H9N2) | L | V | D | S | D | A |
A/Guangdong/MZ058/2016(H9N2) | L | K | D | S | D | A |
A/Beijing/1/2017(H9N2) | L | V | D | S | D | A |
A/Hunan/37286/2017(H9N2) | L | V | D | S | D | A |
A/Hunan/42088/2017(H9N2) | L | V | D | S | D | A |
A/Hunan/34179/2018(H9N2) | L | V | D | S | D | A |
A/Guangxi/11522/2018(H9N2) | L | E | D | S | D | A |
A/Anhui/39/2018(H9N2) | L | V | D | S | D | A |
A/Guangdong/18SF003/2018(H9N2) | L | E | D | S | D | A |
A/Guangdong/18SF064/2018(H9N2) | L | E | D | S | D | A |
A/Fujian/2881/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/1187/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/1317/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/1423/2019(H9N2) | L | E | D | S | D | A |
A/Hubei/1534/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/1565/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/1631/2019(H9N2) | L | - | - | - | - | - |
A/Hubei/1693/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/1803/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/2081/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/2280/2019(H9N2) | L | E | D | S | D | A |
A/Hubei/2299/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/2370/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/239/2019(H9N2) | L | E | D | S | D | A |
A/Hubei/2462/2019(H9N2) | L | E | D | S | D | A |
A/Hubei/2542/2019(H9N2) | L | E | D | S | D | A |
A/Hubei/295/2019(H9N2) | L | V | D | S | D | A |
A/Hubei/362/2019(H9N2) | L | E | D | S | D | A |
A/Suzhou/GIRD01/2019(H9N2) | L | E | D | S | D | A |
A/Fujian/1348/2020(H9N2) | L | E | D | S | D | A |
A/Guangdong/20SF8034/2020(H9N2) | L | E | D | S | - | - |
A/Guangdong/SF1634/2020(H9N2) | L | - | - | - | - | - |
A/Guangdong/20SF15010/2020(H9N2) | L | - | - | - | - | - |
A/Guangdong/11172/2020(H9N2) | L | E | D | S | D | A |
A/Guizhou/13392/2020(H9N2) | L | - | - | - | - | - |
A/Hunan/11173/2020(H9N2) | L | V | D | S | D | A |
A/Shandong/01/2020(H9N2) | L | V | D | S | D | A |
A/Sichuan/1619/2020(H9N2) | L | - | - | - | - | - |
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