摘要目的 建立基于汉滩病毒(HTNV)84FLi株L片段的RNA聚合酶Ⅰ微基因组拯救体系.方法 将含有氯霉素乙酰转移酶(CAT)编码区的cDNA插入含有HTNV 84FLi株L片段5'端和3'端非编码区的质粒内的两个非编码区之间,将此eDNA嵌合体(polⅠ表达盒)克隆人人polⅠ肩动子和终止子之间,分别获得正义和反义方向的RNA polⅠ转录报告质粒.用报告质粒转染293T细胞或等量293T和HTNV感染的Vero混合培养细胞,在HTNV的L蛋白和核衣壳蛋白表达质粒共转染后48 h收获细胞,检测CAT活性.用上清液感染293T细胞,了解CAT活性的传代能力.结果 构建了正义和反义方向的HTNV 84FLi株L片段微基因组RNA聚合酶Ⅰ报告质粒pLvRNA-CAT和pLcRNA-CAT,用此质粒转染细胞后能检测到CAT的表达,且CAT活性能在拯救病毒微基因组中传代.结论 应用RNA聚合酶Ⅰ反向遗传操作技术成功拯救了HTNV 84FLi株微基冈组.

abstractsObjective To develop a reverse genetics system for Hantaan virus (HTNV) 84FLi strain by using RNA polymerase [ (pol Ⅰ)-mediated transcription. Methods Complementary DNA (cDNA) containing the coding sequence for chloramphenicol acetyhransferase (CAT) was inserted into the 5'-and 3'-terminal untranslated regions of HTNV 84FLi L segment. These chimeric cDNAs (pol Ⅰ expression cassette) were cloned into plasmids and between the human pol Ⅰ promoter and terminator to generate sense and anti-sense RNA pol Ⅰ transcription reporter plasmids. The reporter plasmids were transfeeted into 293T cells or the 1:1 combination of 293T and HTNV infected Vero cells. These cells were cotransfected with expression plasmids encoding Ⅰ. (RNA dependent RNA polymerase) and N (nucleoprotein) viral proteins, Cells were harvested 48 h post-transfection and the CAT activity was detected. The 293T cells were infected with the supernatant to explore the passage ability of CAT activity. ResultsThe reporter plasmids pLvRNA-CAT and pLcRNA-CAT were constructed successfully. CAT activity was detected in transfected cells and could also be serially passaged in the rescued virus minigenomes. Conclusion The RNA polymerase ]-driven reverse genetics system successfully rescues HTNV 84FLi minigenomes.