TBC1D15基因敲除细胞系的构建及其功能研究

来源 :中国生物化学与分子生物学会2016年全国学术会议 | 被引量 : 0次 | 上传用户:wilson_rui
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  目的:构建TBC1D15 基因敲除细胞系并进一步研究其功能.方法:(1)SgRNA 序列设计:应用http://crispr.mit.edu/设计针对TBC1D15 第五个外显子的一对最优gRNA,标记为a、b,根据获得的gRNA 序列设计互补引物,并在两端增加Bpi I 的酶切位点.(2)重组质粒pX462-TBC1D15-1a 和pX462-TBC1D15-1b 的构建与鉴定:用Fast Digest BpiⅠ对pX462 进行酶切,用T4 ligase 将线性的pX462 质粒载体分别与互补引物逐步退火产物后进行链接,连接产物转化后涂板、挑斑培养后送去测序,测序正确的克隆提取重组质粒.(3)细胞转染、筛选:MTT 法筛选获得90%Hela 细胞致死时嘌呤霉素浓度后,消化Hela 细胞,按一定密度接种于6 孔板中,以备次日转染.将Lipo3000转染试剂和DMEM 混合,重组质粒pX462-TBC1D15-1a 和pX462-TBC1D15-1b 分别与DMEM 及lipo3000 辅助转染试剂混合,随后将Lipo3000 转染试剂混合物与重组质粒混合物混合,室温孵育5 min 后加入培养基中.培养48 h 后加入嘌呤霉素筛选.筛选48 h 后消化细胞,用有限稀释法将细胞按一定密度接种于96 孔板中,每隔2 天换一次培养基,获得单细胞.(4)基因敲除细胞系的鉴定及功能研究:单细胞扩大培养后,通过Western Blotting 及RT-PCR 分别检测TBC1D15 蛋白转录及表达,基因组PCR 并测序检测靶定位点基因组序列变化.通过形态学比较、细胞核及细胞骨架染色,比较TBC1D15 基因敲除后对细胞的影响.结果:1μg/mL 时Hela 细胞有90%的致死率,因此,在后续筛选细胞系中使用嘌呤霉素浓度1μg/mL(Helacell)来处理细胞.筛选出来的单克隆细胞,从形态学上来讲,TBC1D15 基因敲除后的Hela 细胞有明显的变化,Western blotting 结果显示挑选出来的单克TBC1D15 不表达.结论:成功获得一株TBC1D15 基因敲除的Hela 细胞系,且TBC1D15 基因敲除后对细胞形态有影响,有助于进一步研究TBC1D15 可能参与的信号途径.
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