利用CRISPR/Cas9技术构建Nedd4基因敲除BMDM巨噬细胞系

目的 利用CRISPR/Cas9技术构建Nedd4基因敲除骨髓衍生巨噬细胞系(BMDM),为研究Nedd4在巨噬细胞中的作用和机制奠定基础.方法 利用在线软件筛选了评分较高的3个针对Nedd4基因的单向导RNA(sgRNA),然后将合成的sgRNA序列插入到PX330质粒中;将重组质粒转入BMDM细胞,通过有限稀释法获取单克隆,采用Western印迹检测单克隆细胞中NEDD4蛋白水平;通过序列测定确认单克隆细胞的DNA序列.结果 通过Western印迹检测获取1株NEDD4蛋白缺失的BMDM细胞;测序结果表明该细胞系中Nedd4基因发生了16 bp的缺失突变.结论 利用CRISPR/Cas9技术构建的Nedd4敲除BMDM细胞系将成为研究Nedd4在巨噬细胞中的功能和机制的有力工具.

Construction of Nedd4 knockout BMDM cell line by CRISPR/Cas9 technology

Objective To construct Nedd4 knockout bone marrow-derived macrophages(BMDM) cell line by CRISPR/Cas9 technology and to provide an effective tool for studying the function and mechanism of Nedd4 in macrophage.Methods First,three high-grade sgRNAs targeting Nedd4 gene exons were screened using the online tool before synthesized sgRNAs were inserted into the PX330 plasmid respectively.Secondly,the recombinant plasmids were transferred into BMDM cells and monoclonal cells were obtained by limiting dilution method.The protein levels of NEDD4 in monoclonal cells were detected by Western blotting.Finally,the DNA sequence of the monoclonal cells was confirmed by sequence analysis.Results One Nedd4 knockout BMDM cell line was obtained.The sequencing result showed that the Nedd4 gene had 16bp deletion mutation in this cell line.Conclusion The Nedd4 knockout BMDM macrophage cell line constructed by CRISPR/Cas9 technology will be a useful tool for studying the function and mechanism of Nedd4 in BMDM cells.