【摘要】 目的构建微小肌营养不良蛋白(minidystrophin)和增强绿色荧光蛋白(enhanced greenfluoresce protein, EGFP)融合基因的人源载体,观察该载体在Cos-7细胞中的表达。方法以正常人肌营养不良基因cDNA(GenBank NM 004006)为模板,通过PCR克隆的方法构建minidystrophin基因,融合EGFP基因后连接到人源载体pHrneo,大量提取重组质粒,转染Cos-7细胞,通过逆转录聚合酶链反应、荧光显微镜观察等方法检测该载体在细胞内的表达。结果成功构建pHrnDysG载体,转染Cos-7后,逆转录聚合酶链反应可扩增出735 bp特异条带,荧光显微镜观察可见表达蛋白分布于细胞膜上。结论pHrn载体介导的minidystrophin基因可以在真核细胞表达,并被有效地转运至细胞膜,可望用于杜氏肌营养不良基因治疗的研究。更多还原

【Abstract】 Objective To construct a human source vector containing minidystrophin-EGFP fusion gene and investigate its expression in Cos-7 cells. Methods The recombinant human source vector named pHrnDysG was constructed with PCR-clone methods. Three fragments of dystrophin gene were PCR amplified from normal human dystrophin gene cDNA (GenBank NM04006). These three fragments were ligated to generate a minidystrophin gene. The enhanced green fluorescent protein (EGFP) gene was fused to the C terminal of the minidystrophin gene, and then the pHrnDysG was finally obtained by cloning the fusion gene to pHrneo. Fluorescence microscope and RT-PCR were used to detect the expression of minidystrophin-EGFP fusion gene after the recombinant construct was transfected into Cos-7 cells by lipofectamine. Results Restrictive enzyme digestion analysis and sequencing confirmed that pHrnDysG vector was constructed successfully. After the recombinant pHrnDysG was transfected to Cos-7 cells, RT-PCR demonstrated that the fusion gene was successfully transcribed, and the green fluorescence was observed at the cell membrane. Conclusion The minidystrophin-EGFP fusion gene mediated by pHrneo vector could express in Cos-7 cells and its products’ localization in the cell membrane was the same as that of full length dystrophin. These results suggested that the recombinant human source vector pHrnDysG might be potentially used in studies on the gene therapy of Duchenne muscular dystrophy.更多还原