2010年上海地区肠道病毒71型分离株VP1区基因特征分析

目的 了解2010年上海地区手足口病患者中肠道病毒71型(EV71)分离株VP1区基因特征.方法 选取2010年不同时间的轻症与重症病例EV71分离株18株,对其抗原决定簇部位VP1区进行核苷酸序列测定、比对,并与美国国立生物技术信息中心公布的EV71 A、B、C各基因型分离株序列进行比对,构建系统发生树.结果 上...

Study on genetic characteristics of VP1 region of Enterovirus 71 strains isolated from Shanghai, China in 2010

Objective To study the gene characteristics of VP1 region of Enterovirus 71 (EV71) strains isolated from clinical specimens of children with hand-foot-and-mouth disease(HFMD) in Shanghai in 2010.Methods Eighteen EV71 isolates were selected from different periods of year 2010,including strains isolated from fatal cases and non-fatal cases.Complete VP1 gene (891nucleotides) of the eighteen EV71 isolates were amplified and sequenced,and then compared with that of genotype A,B,C reference EV71 strains in GeneBank by homogeneity and phylogenetic tree analyses.Results The nucleotide homogeneities between these 18 Shanghai strains and the representative isolates of genotype A and B were 81.5 ％ -82.6 ％ and 83.4 ％- 84.2 ％,respectively,while the amino acid homogeneities were 94.3 ％- 95.0％ and 96.6％ -97.0％,respectively.The nucleotide and amino acid homogeneities between the 18 Shanghai strains and the representative isolates of genotype C were 87.4％- 99.2％ and 98.7％ -100.0％,respectively.Of note,the nucleotide and amino acid homogeneities between Shanghai strains and Fuyang EV71 strains (representative strain of C4 subtype) appeared to be 97.8％- 99.2％ and 99.3％- 100.0％,respectively.The eighteen EV71 Shanghai strains were classified as genotype C,subgenogroup C4 in the phylogenetic tree.There was no remarkable difference in VP1 gene between the strains isolated from fatal cases and non-fatal cases.Conclusion The EV71 strains isolated from Shanghai belong to subgenogroup C4.