[Objective] To establish an efficient, convenient and economical method for site-directed mutagenesis. [Method] The target mutation was introduced into primers designed by DNAMAN5.0 software. Through overlap extension...[Objective] To establish an efficient, convenient and economical method for site-directed mutagenesis. [Method] The target mutation was introduced into primers designed by DNAMAN5.0 software. Through overlap extension PCR for twice obtained the mutation gene which of the full length of the recombinant Human Tissue type plasminogen activator （Reteplase）. The mutation gene cloned it into pEASY- blunt simple cloning vector for sequencing. [Result] The sequencing results showed that three site mutations were fully consistent with the expected results （10~ site had been added a base-pair of A, C had been changed into G at 137~ site, G had been changed into A at 686~ site）.Three site mutations were introduced by using overlap extension PCR on one-step. The overall rate of obtaining the mutant sites was 100%. Site-directed mutagenesis will clone the recombinant Human Tissue type plas- minogen activator and laid the basis for the functional study. [Conclusion] Site-directed mutagenesis was successfully implemented based on the overlap extension PCR which is an efficient, convenient and economical DNA-directed mutagenesis method.展开更多
目的通过重叠延伸PCR技术构建CD74-ROS1-L1951R点突变质粒。方法根据CD74-ROS1融合基因序列和真核表达质粒p CM V-C-Flag上的多克隆位点设计引物,利用重叠延伸PCR技术对CD74-ROS1融合基因进行基因定点突变得到CD74-ROS1-L1951R点突变融...目的通过重叠延伸PCR技术构建CD74-ROS1-L1951R点突变质粒。方法根据CD74-ROS1融合基因序列和真核表达质粒p CM V-C-Flag上的多克隆位点设计引物,利用重叠延伸PCR技术对CD74-ROS1融合基因进行基因定点突变得到CD74-ROS1-L1951R点突变融合基因,随后将其酶切定向连入真核表达质粒p CMV-C-Flag启动子下游,构建p CMV-C-Flag-CD74-ROS1-L1951R重组质粒。重组质粒经菌落PCR、双酶切鉴定和测序,鉴定目的基因是否插入p CM V-CFlag质粒及定点突变是否成功。结果通过双酶切鉴定和测序结果显示,质粒的方向及序列正确,阅读框正确无误,表明CD74-ROS1-L1951R基因成功插入p CMV-C-Flag质粒,且CD74-ROS1-L1951R基因定点突变正确。结论成功构建了p CM V-C-Flag-CD74-ROS1-L1951R真核表达重组质粒,为研究CD74-ROS1点突变导致的耐药机制奠定了基础,可用于后续研究。展开更多
基金Supported by National Natural Science Foundation of China(31160032)~~
文摘[Objective] To establish an efficient, convenient and economical method for site-directed mutagenesis. [Method] The target mutation was introduced into primers designed by DNAMAN5.0 software. Through overlap extension PCR for twice obtained the mutation gene which of the full length of the recombinant Human Tissue type plasminogen activator （Reteplase）. The mutation gene cloned it into pEASY- blunt simple cloning vector for sequencing. [Result] The sequencing results showed that three site mutations were fully consistent with the expected results （10~ site had been added a base-pair of A, C had been changed into G at 137~ site, G had been changed into A at 686~ site）.Three site mutations were introduced by using overlap extension PCR on one-step. The overall rate of obtaining the mutant sites was 100%. Site-directed mutagenesis will clone the recombinant Human Tissue type plas- minogen activator and laid the basis for the functional study. [Conclusion] Site-directed mutagenesis was successfully implemented based on the overlap extension PCR which is an efficient, convenient and economical DNA-directed mutagenesis method.
文摘氨基酸通透酶(amino acid permease,AAPs)是一种跨膜转运蛋白,广泛参与植物体内氨基酸的吸收与转运。本试验通过重叠延伸PCR技术对氨基酸通透酶基因进行单碱基定点突变,以便为今后研究植物对外源氮的吸收与利用率奠定基础。本研究根据Tair数据库中拟南芥AtAAP1基因序列,利用Primer Premier 5.0软件设计含有1个突变位点的2对互补的定点突变引物和1对带有pCAMBIA3301-GFP载体的多克隆位点的接头引物,以野生型拟南芥叶片的cDNA为模板,进行3次PCR扩增,将获得的突变基因片段连接到pCAMBIA3301-GFP载体上,转化DH5α感受态细胞。将筛选的阳性菌株送至公司测序,测序结果表明拟南芥AtAAP1基因的第908位碱基A突变为T,实现了单碱基定点突变,这与预计结果相同,说明成功依靠重叠延伸PCR技术做到目的基因的定点突变。该技术能方便快速地获得定点突变序列,为进一步研究AtAAP1基因的功能奠定了基础。
文摘目的通过重叠延伸PCR技术构建CD74-ROS1-L1951R点突变质粒。方法根据CD74-ROS1融合基因序列和真核表达质粒p CM V-C-Flag上的多克隆位点设计引物,利用重叠延伸PCR技术对CD74-ROS1融合基因进行基因定点突变得到CD74-ROS1-L1951R点突变融合基因,随后将其酶切定向连入真核表达质粒p CMV-C-Flag启动子下游,构建p CMV-C-Flag-CD74-ROS1-L1951R重组质粒。重组质粒经菌落PCR、双酶切鉴定和测序,鉴定目的基因是否插入p CM V-CFlag质粒及定点突变是否成功。结果通过双酶切鉴定和测序结果显示,质粒的方向及序列正确,阅读框正确无误,表明CD74-ROS1-L1951R基因成功插入p CMV-C-Flag质粒,且CD74-ROS1-L1951R基因定点突变正确。结论成功构建了p CM V-C-Flag-CD74-ROS1-L1951R真核表达重组质粒,为研究CD74-ROS1点突变导致的耐药机制奠定了基础,可用于后续研究。
