AIM: To explore the propriety of providing hepatitis B virus(HBV) genotypes F and H with two distinct genotypes.METHODS: Eleven HBV isolates of genotype F (HBV/F)were recovered from patients living in San Francisco,Ja...AIM: To explore the propriety of providing hepatitis B virus(HBV) genotypes F and H with two distinct genotypes.METHODS: Eleven HBV isolates of genotype F (HBV/F)were recovered from patients living in San Francisco,Japan, Panama, and Venezuela, and their full-length sequences were determined. Phylogenetic analysis was carried out among them along with HBV isolates previously reported.RESULTS: Seven of them clustered with reported HBV/F isolates in the phylogenetic tree constructed on the entire genomic sequence. The remaining four flocked on another branch along with three HBV isolates formerly reported as genotype H. These seven HBV isolates, including the four in this study and the three reported, had a sequence divergence of 7.3-9.5% from the other HBV/F isolates,and differed by ＞ 13.7% from HBV isolates of the other six genotypes (A-E and G). Based on a marked genomic divergence, falling just short of ＞8% separating the seven genotypes, these seven HBV/F isolates were classified into F2 subtype and the former seven into F1 subtype provisionally. In a pairwise comparison of the S-gene sequences among the 7 HBV/F2 isolates and against 47HBV/F1 isolates as well as 136 representing the other six genotypes (A-E and G), two clusters separated by distinct genetic distances emerged.CONCLUSION: Based on these analyses, classifying HBV/F isolates into two subtypes (F1 and F2) would be more appropriate than providing them with two distinct genotypes (F and H).展开更多
Objective:To directionally clone the ompl gene from Chlamydia trachomatis(Ct)F Genotype onto a plasmid vector for constructing a rudimentary DNA vaccine.Methods:The complete ompl gene from genomic DNA of Ct F genotype...Objective:To directionally clone the ompl gene from Chlamydia trachomatis(Ct)F Genotype onto a plasmid vector for constructing a rudimentary DNA vaccine.Methods:The complete ompl gene from genomic DNA of Ct F genotype wild species was amplified with primers designed by computer.The recombinant gene was obtained by restriction enzyme cutting,linking the gene with the plasmid vector in vitro,transforming the recombinant gene into bacteria,and extracting the DNA from the bacteria.Results:DNA extracting from the bacteria was composed of the impl gene and plasmid,which is identified by three methods of singular restrictive enzyme cutting,double restrictive enzyme cutting and PCR.Conclusion:Cloning of the ompl gene from the Ct F genotype means that a rudimentary DNA vaccine was successfully constructed.展开更多
目的探索不同月龄婴幼儿接种F基因型腮腺炎减毒活疫苗(Mumps attenuated live vaccine, MuV)后的免疫应答差异。方法招募无流行性腮腺炎疾病史且未接种过含腮腺炎成分疫苗的8-24月龄健康婴幼儿,接种F基因型MuV,采集免疫前和免疫后28d血...目的探索不同月龄婴幼儿接种F基因型腮腺炎减毒活疫苗(Mumps attenuated live vaccine, MuV)后的免疫应答差异。方法招募无流行性腮腺炎疾病史且未接种过含腮腺炎成分疫苗的8-24月龄健康婴幼儿,接种F基因型MuV,采集免疫前和免疫后28d血标本,检测抗F基因型腮腺炎病毒中和抗体。结果分别招募8-12月龄、13-17月龄、18-24月龄健康儿童132名、104名、99名。3个年龄组儿童MuV免疫后抗F基因型腮腺炎病毒中和抗体阳性率分别为88.6%、90.4%、90.9%(χ~2=0.37,P=0.832),阳转率分别为87.9%、89.4%、89.9%(χ~2=0.27,P=0.874),几何平均滴度分别为1:5.88、1:7.12、1:6.83(H=1.25,P=0.536)。结论不同月龄婴幼儿接种F基因型MuV后均有良好免疫应答。展开更多
文摘AIM: To explore the propriety of providing hepatitis B virus(HBV) genotypes F and H with two distinct genotypes.METHODS: Eleven HBV isolates of genotype F (HBV/F)were recovered from patients living in San Francisco,Japan, Panama, and Venezuela, and their full-length sequences were determined. Phylogenetic analysis was carried out among them along with HBV isolates previously reported.RESULTS: Seven of them clustered with reported HBV/F isolates in the phylogenetic tree constructed on the entire genomic sequence. The remaining four flocked on another branch along with three HBV isolates formerly reported as genotype H. These seven HBV isolates, including the four in this study and the three reported, had a sequence divergence of 7.3-9.5% from the other HBV/F isolates,and differed by ＞ 13.7% from HBV isolates of the other six genotypes (A-E and G). Based on a marked genomic divergence, falling just short of ＞8% separating the seven genotypes, these seven HBV/F isolates were classified into F2 subtype and the former seven into F1 subtype provisionally. In a pairwise comparison of the S-gene sequences among the 7 HBV/F2 isolates and against 47HBV/F1 isolates as well as 136 representing the other six genotypes (A-E and G), two clusters separated by distinct genetic distances emerged.CONCLUSION: Based on these analyses, classifying HBV/F isolates into two subtypes (F1 and F2) would be more appropriate than providing them with two distinct genotypes (F and H).
文摘Objective:To directionally clone the ompl gene from Chlamydia trachomatis(Ct)F Genotype onto a plasmid vector for constructing a rudimentary DNA vaccine.Methods:The complete ompl gene from genomic DNA of Ct F genotype wild species was amplified with primers designed by computer.The recombinant gene was obtained by restriction enzyme cutting,linking the gene with the plasmid vector in vitro,transforming the recombinant gene into bacteria,and extracting the DNA from the bacteria.Results:DNA extracting from the bacteria was composed of the impl gene and plasmid,which is identified by three methods of singular restrictive enzyme cutting,double restrictive enzyme cutting and PCR.Conclusion:Cloning of the ompl gene from the Ct F genotype means that a rudimentary DNA vaccine was successfully constructed.
文摘目的探索不同月龄婴幼儿接种F基因型腮腺炎减毒活疫苗(Mumps attenuated live vaccine, MuV)后的免疫应答差异。方法招募无流行性腮腺炎疾病史且未接种过含腮腺炎成分疫苗的8-24月龄健康婴幼儿,接种F基因型MuV,采集免疫前和免疫后28d血标本,检测抗F基因型腮腺炎病毒中和抗体。结果分别招募8-12月龄、13-17月龄、18-24月龄健康儿童132名、104名、99名。3个年龄组儿童MuV免疫后抗F基因型腮腺炎病毒中和抗体阳性率分别为88.6%、90.4%、90.9%(χ~2=0.37,P=0.832),阳转率分别为87.9%、89.4%、89.9%(χ~2=0.27,P=0.874),几何平均滴度分别为1:5.88、1:7.12、1:6.83(H=1.25,P=0.536)。结论不同月龄婴幼儿接种F基因型MuV后均有良好免疫应答。
