遗传 ›› 2016, Vol. 38 ›› Issue (8): 756-764.doi: 10.16288/j.yczz.16-002

• 研究报告 • 上一篇    

快速构建多重sgRNA载体利用CRISPR/Cas9技术敲除拟南芥IAA2基因

刘丁源, 邱婷, 丁晓辉, 李苗苗, 朱睦元, 王君晖   

  1. 浙江大学生命科学学院,杭州310058
  • 收稿日期:2016-01-04 修回日期:2016-02-16 出版日期:2016-08-20 发布日期:2016-05-09
  • 通讯作者: 王君晖,副教授,研究方向:遗传学。E-mail: junhuiwang@zju.edu.cn E-mail:dingyuan0726@126.com
  • 作者简介:刘丁源,硕士研究生,专业方向:遗传学。E-mail: dingyuan0726@126.com
  • 基金资助:
    国家自然科学基金项目(编号:31170211)和浙江省科技计划项目(编号:2012C12902)资助

Rapid construction of multiple sgRNA vectors and knockout of the Arabidopsis IAA2 gene using the CRISPR/Cas9 genomic editing technology

Dingyuan Liu, Ting Qiu, Xiaohui Ding, Miaomiao Li, Muyuan Zhu, Junhui Wang   

  1. College of Life Sciences, Zhejiang University, Hangzhou 310058, China
  • Received:2016-01-04 Revised:2016-02-16 Online:2016-08-20 Published:2016-05-09
  • Supported by:
    Supported by the National Natural Science Foundation of China (No; 31170211) and Science and Technology Research Projects of Zhejiang Province(No; 2012C12902)

摘要: IAA2(Indole Acetic Acid 2)是拟南芥Aux/IAA生长素响应基因大家族中的一员,目前还没有它的突变体的报道,阻碍了对其功能和作用机制的深入研究。在CRISPR/Cas9基因组编辑技术中,1个sgRNA只能靶向基因的1个位点,有时基因敲除的效率并不高。为了提高敲除效率,本文在Golden-Gate克隆技术的基础上,通过两轮PCR扩增,将每3个sgRNA串联到同1个入门载体中,再将入门载体与含Cas9表达框的目标载体LR反应,获得最终的表达载体。结果表明,设计的6个sgRNA有4个发挥了作用,产生了碱基插入突变和大片段缺失突变等多种可遗传的突变。与单个sgRNA相比,多重sgRNA的基因敲除效率高、种系突变多;与其他构建多重sgRNA载体的方法相比,本方法具有快速、高效等优点。本文所得到的5个突变体为后续的IAA2功能研究提供了良好的材料。

关键词: CRISPR/Cas9, 多重sgRNA串联, 基因组编辑, IAA2基因

Abstract: IAA2 is a member of the Aux/IAA auxin responsive gene family in Arabidopsis thaliana. No iaa2 mutant has been reported until now, thus hindering its further mechanistic investigations. The normal genomic editing technology of CRISPR/Cas9 (Clustered regularly interspaced short palindromic repeats/CRISPR-associated protein 9) uses only a single guide RNA (sgRNA) to target one site in a specific gene, and the gene knockout efficiency is not high. Instead, multiple sgRNAs can target multiple sites; therefore, the efficiency may be improved. In the present investigation, we used the golden-gate cloning strategy and two rounds of PCR reactions to combine three sgRNAs in the same entry vector. The final expression vector was obtained by LR reactions with the destination vector containing the Cas9 expression cassette. Four out of the six sgRNAs were effective, and we also obtained a lot of insertion and deletion mutations. Compared with one sgRNA approach, multiple sgRNAs displayed higher gene-knockout efficiency and produced more germ-line mutants. Thus, we established a more rapid and efficient method and generated five mutants for further studies of IAA2 functions.

Key words: CRISPR/Cas9, multiple sgRNAs, genome editing, IAA2