›› 2016, Vol. 43 ›› Issue (1): 31-38.doi: 10.16431/j.cnki.1671-7236.2016.01.005

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Study on Detection of Pig SST Gene Site-directed Modification Activity by CRISPR/Cas9 System in vitro

LI Xiao-min1, REN Hong-yan2, BI Yan-zhen2, LIU Xi-mei2, ZHENG Xin-min2, WU Min-yao1   

  1. 1. College of Life Sciences, Shaanxi Normal University, Xi'an 710119, China;
    2. Key Laboratory of Animal Embryo Engineering and Molecular Breeding of Hubei Province, Institute of Animal and Veterinary Sciences, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
  • Received:2015-07-24 Online:2016-01-20 Published:2016-01-23

Abstract: This study was aimed to detect the targets activities which were modified in pig SST gene through the CRISPR/Cas9 enzyme digestion method in vitro.Five 20 bp sgRNAs SST-sgRNA-g1, SST-sgRNA-g2, SST-sgRNA-g3, SST-sgRNA-g4 and SST-sgRNA-g5 of SST were designed.Oligonucleotide sequences of sgRNA were chemically synthesized, and then inserted into linearized plasmid which could express Cas9 and sgRNA together.Then, the correct sgRNA plasmids were selected as a template for transcription of SST-sgRNA in vitro.Target DNA fragments were digested by CRISPR/Gas9in vitro and then the gray bands of enzyme digestion were converted into sgRNA activity.The results indicated that the target nucleotide sequences were successfully inserted into the expected sites of vector and sequences were correct.The vector was successfully transcribed into sgRNA in vitro.It showed that compared with standard sgRNA1 and sgRNA2 enzyme activity, the target SST-sgRNA-g1, SST-sgRNA-g4 and SST-sgRNA-g5 had high activities, they could provide basis for the site-directed modification of gene in cell and embryo.

Key words: pig; SST gene; Cas9 enzyme; single-guide RNA(sgRNA); transcription in vitro

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