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Hereditas(Beijing) ›› 2019, Vol. 41 ›› Issue (4): 327-336.doi: 10.16288/j.yczz.18-294

• Research Article • Previous Articles     Next Articles

MEK inhibitor PD0325901 significantly boosts ssODN-mediated HDR efficiency in porcine fetal fibroblasts

Hao Ou1,Guoling Li1,Haoqiang Wang1,Guangyan Huang1,Gengyuan Cai1,2,Zicong Li1,Zhenfang Wu1,2,Xianwei Zhang1,2()   

  1. 1. National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, China
    2. Wens Foodstuff Group Co., Ltd, Xinxing 527400, China
  • Received:2018-10-29 Revised:2019-03-02 Online:2019-04-20 Published:2019-03-25
  • Contact: Zhang Xianwei E-mail:zxianw@163.com
  • Supported by:
    the National Natural Science Foundation of China(31772555);the National Transgenic Major Projects(2016ZX08006002)

Abstract:

There are two major pathways, homology-directed repair (HDR) and nonhomologous end joining (NHEJ), involved in double-strand break (DSB) repair. Single-stranded oligodeoxyribonucleotide (ssODN)-mediated homologous recombination repair is commonly used for animal site-directed genome editing, with great scientific and practical value. To improve ssODN-mediated HDR efficiency in the pig genome, we investigated the effect and molecular mechanism of mitogen-activated extracellular signal-regulated kinase (MEK) inhibitor PD0325901 on the HDR efficiency in porcine fetal fibroblasts (PFFs). The results showed that PD0325901 obviously increased the percentage of G2 and S phase cell populations and reduced the cell population ratio in the G1 phase of PFFs, and promoted the expression of HDR repair factor. At the optimal concentration of 250 nmol/L, PD0325901 increased the repair efficiency of ssODN-mediated GFP reporter vector by 58.8% and the directed editing efficiency of PFF DMD and ROSA26 locus by 48.16% and 17.64%, respectively. The results show that MEK inhibitor PD0325901 significantly promotes the efficiency of ssODN-mediated homologous-directed repair in the porcine genome, thus offering a new idea to generate genetically modified pigs more effectively.

Key words: MEK inhibitor, homologous-directed repair (HDR), PD0325901, gene editing