北京地区2006-2008年肠道病毒71型VP1区基因特征分析

李仁清; 陈丽娟; 王玉梅; 张合润; 贺雄

Abstract

李仁清,陈丽娟,王玉梅,张合润,贺雄.北京地区2006-2008年肠道病毒71型VP1区基因特征分析[J].Chinese journal of Epidemiology,2009,30(1):45-49

北京地区2006-2008年肠道病毒71型VP1区基因特征分析

Genetic characteristics of enterovirus 71 isolated in Beijing,2006-2008

Received:September 19, 2008

DOI：

KeyWord: 手足口病肠道病毒71型基因型

English Key Word: Hand foot mouth disease Enterovirus 71 Genotype

FundProject:

Author Name	Affiliation
LI Ren-qing	Beijing Center for Disease Control and Prevention, Beijing 100013, China
CHEN Li-juan	Beijing Center for Disease Control and Prevention, Beijing 100013, China
WANG Yu-mei	Beijing Center for Disease Control and Prevention, Beijing 100013, China
ZHANG He-run	Beijing Center for Disease Control and Prevention, Beijing 100013, China
HE Xiong	Beijing Center for Disease Control and Prevention, Beijing 100013, China

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Abstract:

目的了解2006-2008年北京地区分离的不同来源肠道病毒71型(EV71)VP1区基因特征.方法从手足口病例、急性弛缓性麻痹病例和健康儿童的粪便、咽拭子和疱疹液标本中分离EV71病毒株,选取其中9株EV71分离株,采用RT-PCR扩增VPl区全长基因片段并进行序列测定、系统发生树构建、核苷酸同源性及组内和组间进化距离分析.结果 9株EV71在系统发生树上与C基因型中的C4亚型代表株属同一分支;在核苷酸同源性分析中,9株分离株与C4亚型代表株的同源性达到92.1%～93.9%,明显高于与C1、C2、C3亚型代表株的同源性(分别为88.8%～89.5%、89.4%～90.0%和88.4%～89.3%);三种不同来源的分离株病毒之间具有较高的同源性(95.9%～100.0%),但与1998年分离的C4亚型代表株的同源性却较低(分别为93.3%～93.9%和92.1%～92.9%).在进化距离的分析上,C4亚型内各组间距离较大,尤其是亚型代表株与分离株之间距离最大(D=0.052～0.071).结论 2006-2008年北京地区流行的EV71仍然是C4亚型,在同一时间不同地区、不同来源、不同疾病状态卞分离的EV71在VP1区全长基因序列上无明显差别;但是随着时间推移,核苷酸变异的不断积累,出现新亚型的概率也在不断增加,因此有必要加强分离株的监测以掌握EV71的变异趋势.

English Abstract:

Objective To sequence and analyze the VP1 region of isolated enterovirus from different sources in Beijing,2006-2008.Methods 9 EV71 were selected from the isolates identified through the specimen of human hand foot mouth disease (HFMD),acute flaccid paralysis (AFP) and healthy children in Beijing,2006-2008.Reverse transcription-polymerase chain reaction (RT-PCR) method was used to amplify and sequence the whole VP1 gene of enterovirus.Phylogenetic tree was constructed,with the means of nucleotide homology and distance between/within groups analyzed.Results The 9 selected strains were clustered with C4 subgenotype reference strains in Phylogenetic tree and showed high nucleotide acid identity (92.1%-93.9% ) in nucleotide homology analysis,and had higher homology than C1,C2,C3 subgenotype reference strains (88.8%-89.5%,89.4%-90.0% and 88.4%-89.3%,respectively).High homologous (95.9%-100.0%) was noticed between the isolated stains from three different sources,but low homologous (93.3 %-93.9%,92.1%-92.9%,respectively) showed between the isolated stains and C4 reference strains isolated in 1998.There appeared larger variations between groups in C4 subgenotype when analyzing the distance between groups means,especially between the reference strains and isolated strains (D=0.052-0.071).Conclusion The EV71 isolated in Beijing,from 2006 to 2008 also appeared to be C4 subgenotype and there was no significant difference found in the whole sequence ofVP1 gene of the strains isolated from different regions,sources,or under different diseases occurred in the same period.There were more nucleotide variations and more chances for the presence of new subgenotype,suggesting that it is necessary to strengthen the surveillance program on EV71 isolates.

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