利用TALEN技术在牛胎儿成纤维细胞中敲除Myostatin基因

Myostatin knockout in bovine fetal fibroblasts by using TALEN

肌肉生长抑制素(Myostatin,MSTN)基因能够负向调节骨骼肌的生长和发育,牛MSTN基因突变会出现"双肌"特征。文章利用转录激活因子样效应物核酸酶(TALENs)靶向敲除牛胎儿成纤维细胞的MSTN基因,获得敲除MSTN基因的细胞系,为制备MSTN基因敲除牛提供材料。构建一对MSTN基因的TALENs真核表达载体,分别采用PEI转染试剂和电穿孔法进行牛胎儿成纤维细胞的转染,测序结果表明TALEN技术可用于敲除牛MSTN基因,利用T7核酸内切酶1(T7E1)检测其突变效率,结果显示电穿孔转染的敲除效率为20.4%。通过有限稀释法,共获得10个MSTN基因敲除的细胞克隆(包括MSTN-/-和MSTN+/-),其靶位点敲除的碱基数分别是1～20不等,部分会出现移码突变。出现移码突变的细胞系可用于MSTN基因敲除的转基因肉牛的制备。

Myostatin （MSTN） can negatively regulate the growth and development of skeletal muscle, and mutations of bovine MSTN gene can cause a ＂double-muscle＂ feature. To knock out MSTN gene in bovine fetal fibroblast by transcription activator-like effector nucleases （TALENs） and obtain MSTN knockout cell lines, we constructed one pair of MSTN-TALEN vector and transfected into bovine fetal fibroblast cells by PEI and electroporation. Sequencing results demonstrated that TALEN was available for MSTN knockout. T7 endonuclease 1 （T7E1） was used for the detection of mu- tation efficiency. The results indicated that knockout efficiency of electropomtion transfection was 20.4%, and 10 MSTN＋/- and MSTN-/- cell colonies were obtained via limiting dilution method. The deletion number of nucleotides ranged from 1 to 20, and some of them were frameshift mutation, which could provide the possibility in production of MSTN knockout cattle in the future.