一种高效表达小干扰RNA载体的构建研究

Construction of an expression vector for high expression of siRNA

目的:用mir30前体骨架来构建高效表达小干扰RNA载体。方法:通过基因合成的方法,将mir30前体骨架进行全长基因合成,并在合成的mir30前体骨架中引入合适的酶切位点用于外源发夹DNA的克隆,然后将之克隆到含U6启动子的表达载体中。将针对绿色荧光蛋白(greenfluo-rescent protein,GFP)的小干扰RNA克隆到以上表达载体中,通过转染及Western blot来检测新的小干扰RNA表达载体的基因沉默效率。结果:同目前常用的含polIII的小干扰RNA表达载体相比较,用mir30前体骨架表达针对GFP的小干扰RNA的表达载体可以明显抑制GFP的表达。结论:用mir30前体骨架构建的小干扰RNA表达载体可高效表达外源小干扰RNA。

AIM： To construct the vector for efficient expression of siRNA using pre-mir30 backbone. METHODS： By chemical synthesis method, pre-mir30 backbone introduced an appropriate restriction enzyme site for foreign shRNA inserting was cloned into an expressing vector containing U6 promoter. The silencing efficiency of a new siRNA expressing vector was detected by transfection and Western blot. RESULTS： The new vector containing pre-mir30 backbone expressing siRNA against GFP could markedly inhibit the expression of GFP compared with the vector expressing control siRNA. CONCLUSION： siRNA expressing vector constructed by pre-mir30 backbone could highly express foreign siRNA.