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Construction of expression vector containing POAG pathologic mutant MYOC and its expression in COS-7 cells
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 15
- DOI:
- 10.3321/j.issn:1000-2790.2008.15.004
- Key Word:
- MYOC基因;定点突变;凋亡;青光眼;开角型
Abstract： 目的:构建Pro370Leu突变型Myocilin(MYOC)基因真核表达质粒,并在COS-7细胞中表达以探讨突变蛋白表达特点.方法:以pGEM-T-MYOC质粒中MYOC为模板,用PCR介导的定点突变技术,得到Pro370Leu突变型MYOC基因(mutant MYOC,mMYOC),并定向亚克隆到真核表达质粒pDsRed2-N1上,得到pDsRed2-N1-mMYOC重组表达质粒,再用限制性内切酶消化和DNA测序鉴定,最后用脂质体包埋转染法转染COS-7细胞,进行荧光显微镜观察.采用WestemBlot分析蛋白分泌情况并检测突变蛋白对细胞凋亡的影响.结果:经酶切和DNA序列测定,第370密码子CCG转变为CTG,荧光显微镜观察显示mMYOC蛋白只定位在细胞质中,经Western Blot分析表明mMYOC蛋白只存在细胞裂解液中,经流式细胞仪检测突变型转染组凋亡细胞百分比较高为6.63%.结论:Pro370Leu突变型MYOC基因真核表达质粒构建成功,Pro370Leu突变型MYOC基因表达的蛋白呈分泌障碍状态,并具有促进细胞凋亡的趋势.
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