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    2019, Vol. 18 Issue (02): 438-448     DOI: 10.1016/S2095-3119(18)62150-1
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Inhibition of KU70 and KU80 by CRISPR interference, not NgAgo interference, increases the efficiency of homologous recombination in pig fetal fibroblasts
LI Guo-ling1*, QUAN Rong1*, WANG Hao-qiang1, RUAN Xiao-fang1, MO Jian-xin1, ZHONG Cui-li1, YANG Hua-qiang1, 2, LI Zi-cong1, GU Ting1, LIU De-wu1, WU Zhen-fang1, 2, CAI Geng-yuan1, 2, ZHANG Xian-wei1, 2   
1 National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, P.R.China
2 Wens Foodstuff Group Co., Ltd., Yunfu 527400, P.R.China
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Non-homologous end-joining (NHEJ) is a predominant pathway for the repair of DNA double-strand breaks (DSB).  It inhibits the efficiency of homologous recombination (HR) by competing for DSB targets.  To improve the efficiency of HR, multiple CRISPR interference (CRISPRi) and Natronobacterium gregoryi Argonaute (NgAgo) interference (NgAgoi) systems have been designed for the knockdown of NHEJ key molecules, KU70, KU80, polynucleotide kinase/phosphatase (PNKP), DNA ligase IV (LIG4), and NHEJ1.  Suppression of KU70 and KU80 by CRISPRi dramatically promoted (P<0.05) the efficiency of HR to 1.85- and 1.58-fold, respectively, whereas knockdown of PNKP, LIG4, and NHEJ1 repair factors did not significantly increase (P>0.05) HR efficiency.  Interestingly, although the NgAgoi system significantly suppressed (P<0.05) KU70, KU80, PNKP, LIG4, and NHEJ1 expression, it did not improve (P>0.05) HR efficiency in primary fetal fibroblasts.  Our result showed that both NgAgo and catalytically inactive Cas9 (dCas9) could interfere with the expression of target genes, but the downstream factors appear to be more active following CRISPR-mediated interference than that of NgAgo. 
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Articles by authors
LI Guo-ling
WANG Hao-qiang
RUAN Xiao-fang
MO Jian-xin
ZHONG Cui-li
YANG Huaqiang
LI Zi-cong
GU Ting
LIU De-wu
WU Zhen-fang
CAI Geng-yuan
ZHANG Xian-wei
Key wordshomologous recombination     non-homologous end-joining     CRISPRi     NgAgoi     KU70     KU80     
Received: 2017-11-27; Accepted: 2018-11-23
Fund: This work was supported by the National Science and Technology Major Project for Breeding of New Transgenic Organisms, China (2016ZX08006002) and the Guangdong Province “Flying Sail Program” Postdoctoral Foundation, China (2016).
Corresponding Authors: Correspondence ZHANG Xian-wei, E-mail: zxianw@163.com * These authors contributed equally to this study.   
About author: LI Guo-ling, E-mail: liguoling191520@163.com;
Cite this article:   
LI Guo-ling, QUAN Rong, WANG Hao-qiang, RUAN Xiao-fang, MO Jian-xin, ZHONG Cui-li, YANG Huaqiang, LI Zi-cong, GU Ting, LIU De-wu, WU Zhen-fang, CAI Geng-yuan, ZHANG Xian-wei. 2019. Inhibition of KU70 and KU80 by CRISPR interference, not NgAgo interference, increases the efficiency of homologous recombination in pig fetal fibroblasts. Journal of Integrative Agriculture, 18(02): 438-448.
http://www.chinaagrisci.com/Jwk_zgnykxen/EN/ 10.1016/S2095-3119(18)62150-1      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y2019/V18/I02/438
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