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	M gene reassortment in h9n2 influenza virus promotes early infection and replication: contribution to rising virus prevalence in chickens in china
	Pu, Juan1,2; Sun, Honglei1,2; Qu, Yi1,2; Wang, Chenxi1,2; Gao, Weihua1,2; Zhu, Junda1,2; Sun, Yipeng1,2; Bi, Yuhai3; Huang, Yinhua1,2; Chang, Kin-Chow4
刊名	Journal of virology
	2017-04-01
卷号	91期号:8页码:15
关键词	Chicken H9n2 virus M gene Reassortment Replication
ISSN号	0022-538X
DOI	10.1128/jvi.02055-16
通讯作者	Liu, jinhua(ljh@cau.edu.cn)
英文摘要	Segment reassortment and base mutagenesis of influenza a viruses are the primary routes to the rapid evolution of high-fitness virus genotypes. we recently described a predominant g57 genotype of avian h9n2 viruses that caused countrywide outbreaks in chickens in china during 2010 to 2013, which led to the zoonotic emergence of h7n9 viruses. one of the key features of the g57 genotype is the replacement of the earlier a/chicken/beijing/1/1994 (bj/94)-like m gene with the a/quail/hong kong/g1/1997 (g1)-like m gene of quail origin. we report here the functional significance of the g1-like m gene in h9n2 viruses in conferring increased infection severity and infectivity in primary chicken embryonic fibroblasts and chickens. h9n2 virus housing the g1-like m gene, in place of the bj/94-like m gene, showed an early surge in viral mrna and viral rna (vrna) transcription that was associated with enhanced viral protein production and with an early elevated release of progeny virus comprising largely spherical rather than filamentous virions. importantly, h9n2 virus with the g1-like m gene conferred extrapulmonary virus spread in chickens. five highly represented signature amino acid residues (37a, 95k, 224n, and 242n in the m1 protein and 21g in the m2 protein) encoded by the prevalent g1-like m gene were demonstrated to be prime contributors to enhanced infectivity. therefore, the genetic evolution of the m gene in h9n2 virus increases reproductive virus fitness, indicating its contribution to the rising virus prevalence in chickens in china. importance we recently described the circulation of a dominant genotype (genotype g57) of h9n2 viruses in countrywide outbreaks in chickens in china, which was responsible, through reassortment, for the emergence of h7n9 viruses that cause severe human infections. a key feature of the genotype g57 h9n2 virus is the presence of the quail-origin g1-like m gene, which had replaced the earlier bj/94-like m gene. we found that h9n2 virus with the g1-like m gene, but not the bj/94-like m gene, showed an early surge in progeny virus production and more severe pathology and extrapulmonary virus spread in chickens. five highly represented amino acid residues in the m1 and m2 proteins derived from the g1-like m gene were shown to mediate enhanced virus infectivity. these observations enhance what we currently know about the roles of reassortment and mutations in virus fitness and have implications for assessing the potential of variant influenza viruses that can cause a rising prevalence in chickens.
WOS关键词	A VIRUS ; MATRIX PROTEIN ; AVIAN H9N2 ; INTERNAL GENES ; FILAMENTOUS MORPHOLOGY ; SOUTHERN CHINA ; H7N9 VIRUS ; HONG-KONG ; EVOLUTION ; PATHOGENICITY
WOS研究方向	Virology
WOS类目	Virology
语种	英语
出版者	AMER SOC MICROBIOLOGY
WOS记录号	WOS:000399472200014
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2373440
专题	武汉病毒研究所
通讯作者	Liu, Jinhua
作者单位	1.China Agr Univ, Minist Agr, Coll Vet Med, Key Lab Anim Epidemiol & Zoonosis, Beijing, Peoples R China 2.China Agr Univ, State Key Lab Agrobiotechnol, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Microbiol, CAS Key Lab Pathogen Microbiol & Immunol, Beijing, Peoples R China 4.Univ Nottingham, Sch Vet Med & Sci, Sutton Bonington Campus, Loughborough, Leics, England 5.Chinese Acad Sci, Wuhan Inst Virol, Ctr Emerging Infect Dis, Key Lab Special Pathogens & Biosafety, Wuhan, Peoples R China
推荐引用方式 GB/T 7714	Pu, Juan,Sun, Honglei,Qu, Yi,et al. M gene reassortment in h9n2 influenza virus promotes early infection and replication: contribution to rising virus prevalence in chickens in china[J]. Journal of virology,2017,91(8):15.
APA	Pu, Juan.,Sun, Honglei.,Qu, Yi.,Wang, Chenxi.,Gao, Weihua.,...&Liu, Jinhua.(2017).M gene reassortment in h9n2 influenza virus promotes early infection and replication: contribution to rising virus prevalence in chickens in china.Journal of virology,91(8),15.
MLA	Pu, Juan,et al."M gene reassortment in h9n2 influenza virus promotes early infection and replication: contribution to rising virus prevalence in chickens in china".Journal of virology 91.8(2017):15.

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