ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (4): 762-770.doi: 10.11843/j.issn.0366-6964.2016.04.016

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The Application of CRISPR/Cas 9 Technology for aroA Gene Knockout in Escherichia coli

YU Shen-yi,ZHAO Jin-rong,ZHENG Ling-hong,ZHU Er-peng,ZHOU Wu-duo,WU Bao-cheng*   

  1. (College of Animal Science,Fujian Agriculture and Forestry University,Fuzhou 350002,China)
  • Received:2015-10-10 Online:2016-04-23 Published:2016-04-23

Abstract:

CRISPR/Cas 9 system is a novel gene editing technology.This study was aimed to construct CRISPR/Cas 9-based knockout system for E.coli aroA gene,and analyze knockout efficiencies in different E.colis. In the present study,aroA gene-targeting short guide RNA (sgRNA) was designed and constructed together with Donor sequence for homologous repair,then this resulting vector and pEwt-Cas 9 vector co-constituted the CRISPR/Cas 9 system.Preliminary application was performed on E.coli DH10B,DH5α and JM109,respectively,and then knockout efficiencies of aroA gene were analyzed by PCR amplification,TA cloning and subsequent DNA sequencing.The restriction enzyme digestion analysis and sequencing results showed that homologous repair vector was successfully constructed.PCR results indicated that the established CRISPR/Cas 9 system could be used for aroA gene knockout in multiple E.coli with efficiency ranging from 46% to 50%.Sequencing results further confirmed the successful and accurate knockout of aroA gene.In conclusion,CRISPR/Cas 9-based knockout system for E.coli aroA gene was successfully established,which would provide a novel and effective tool for functional studies on aroA genes of other pathogenic microorganisms and further development of attenuated vaccine.

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