小鼠Zbtb38基因慢病毒过表达质粒的构建与鉴定

Construction and Identification of Lentiviral Overexpression Plasmid of Mouse Zbtb38 Gene

本研究旨在构建Zbtb38(zinc finger and BTB domain containing 38)基因慢病毒过表达质粒载体。以小鼠脊髓组织为材料,采用重叠延伸PCR方法扩增小鼠Zbtb38基因的CDS序列,分别设计Zbtb38 CDS序列前段扩增引物1和后段扩增引物2,再以上述两对引物的扩增产物作为模板,设计引物3并进行融合PCR扩增,由此得到Zbtb38 CDS全序列。将获得的Zbtb38基因CDS全序列连接到质粒pGM-T,转化大肠杆菌DH5α感受态细胞,采用直接PCR鉴定阳性克隆并进行测序验证。利用XhoⅠ和BamHⅠ双酶切方法将Zbtb38 CDS序列连接至慢病毒载体Plvx-puro,获得穿梭质粒Plvx-puro-Zbtb38,再与慢病毒包装质粒共转染293T细胞生产慢病毒颗粒。结果显示,引物1扩增产物包含Zbtb38 CDS全序列的第1-1794 bp,扩增产物实际测序长度为1772 bp,引物2扩增产物包含Zbtb38 CDS全序列的第1762-3594 bp,扩增产物实际测序长度为1818 bp,说明分段扩增目的片段已成功。引物3扩增的预期融合产物及菌落PCR扩增产物均包含Zbtb38 CDS全序列(3594 bp),与NCBI数据库Zbtb38基因的CDS序列比对后的重合率达99.99%,表明Zbtb38 CDS序列扩增成功。实时荧光定量PCR检测结果显示,病毒滴度达3.25×108 Tu/mL,达到普通动物注射标准要求,提示慢病毒载体构建成功。综上所述,本试验成功构建了小鼠Zbtb38基因慢病毒过表达质粒载体。

This study was conducted to construct zinc finger and BTB domain containing 38(Zbtb38)gene lentiviral overexpression plasmid vector.Firstly,the CDS sequence of mouse Zbtb38 gene was amplified by overlap extension PCR method using mouse spinal cord tissue,and the Zbtb38 CDS sequence front amplification primer 1 and the latter amplification primer 2 were designed respectively.Using the amplification products of the above two primers as template,primer 3 was designed and subjected to fusion PCR amplification,thereby obtaining the full CDS sequence of Zbtb38.Then,the obtained Zbtb38 gene CDS full sequence was ligated to the plasmid pGM-T,and the recombinant plasmid was transferred into E.coli DH5αcompetent cells,the positive clones were identified and verified by direct PCR and sequencing.Finally,the Zbtb38 CDS sequence was ligated into the lentiviral vector Plvx-puro by XhoⅠand BamHⅠdouble digestion to obtain the shuttle plasmid Plvx-puro-Zbtb38,which was co-transfected with lentiviral packaging plasmids to produce lentiviral particles in 293T cells.The results showed that the primer 1 amplification product contained the first 1-1794 bp of the Zbtb38 CDS sequence,and the actual sequencing length of the amplified product was 1772 bp.The primer 2 amplification product contained the 1762-3594 bp of the entire sequence of Zbtb38 CDS,and the actual sequencing length of the amplified product was 1818 bp,indicating that the fragmented amplification target fragment was successfully obtained.The expected fusion products amplified by primer 3 and the PCR amplification products of the colonies both contained the complete sequence of Zbtb38 CDS(3594 bp),which was compared with the CDS sequence of Zbtb38 gene in NCBI database,and the coincidence rate was 99.99%,indicating that the Zbtb38 CDS sequence was successfully amplified.The Real-time PCR results showed that the virus titer reached 3.25×108 Tu/mL,which met the experimental animal injection standard requirement,indicating that the lentiviral vector was successfully constructed.In summary,the mouse Zbtb38 gene lentiviral overexpression plasmid vector was successfully constructed in this experiment.