论文部分内容阅读
目的:分析江苏省25株新型冠状病毒(2019-nCoV)全基因组序列，研究其进化特征。方法:使用高通量测序技术对确诊病例咽拭子样本进行测序，使用CLC Genomics Workbench 12.0分析单核苷酸多态性(SNP)，MEGA5.1分析病毒进化特征。结果:25株病毒共检测到52处碱基突变，进化分析显示25株病毒分成2个进化分支，分支1含有8 782和28 144位置CT连锁SNPs，而分支2此2位置突变为TC，即8 782 (ORF1ab: C8517T,同义突变)和28 144(ORF8: T251C, L84S)。分支2中5株病毒还含有24 034(S：C2 472T，同义突变)、26 729(M：T207C，同义突变)和28 077(ORF8：G184C，V62 L)连锁SNPs，聚成亚组A，不同分支/亚组在人群分布及与疾病关系无显著差异。结论:2019-nCoV出现了SNPs，其对病毒传播力、致病性等影响有待进一步研究。“,”Objective:The entire genome sequences of 25 novel coronaviruses in Jiangsu province were analyzed and their evolutionary characteristics were studied.Methods:High-throughput sequencing was used to sequence the throat swab samples from confirmed cases. Single nucleotide polymorphisms were analyzed using CLC Genomics Workbench 12.0 software. Evolution characteristics were analyzed by MEGA 5.1.Results:A total of 52 single-base substitution mutations were detected in 25 strains. Phylogenetic analysis showed 25 stains were clustered into two clades. Viruses in clade 1 contain 8 682 and 28 144 CT SNP links. While viruses in clade 2 contain mutations in those two bases, i. e., 8 682 (ORF1ab: C8 517T, synonymous mutation) and 28 144 (ORF8: T251C, L84S). Among clade 2, five stains subclustered into one group based on SNP links in 24 034 (S: C2 472T, synonymous mutation), 26 729 (M: T207C, synonymous mutation), and 28 077 (ORF8: G184C, V62 L). There were no significant differences in the distribution of different clades/subclusters in the population and the disease types.Conclusions:We have found some SNPs occurred in new coronaviruses. The effects of different SNPs on virus transmission and pathogenicity need to be further studied.