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Hereditas(Beijing) ›› 2020, Vol. 42 ›› Issue (7): 641-656.doi: 10.16288/j.yczz.20-056

• Review • Previous Articles     Next Articles

Recent developments in enhancing the efficiency of CRISPR/Cas9- mediated knock-in in animals

Guoling Li1, Shanxin Yang1, Zhenfang Wu1,2, Xianwei Zhang2()   

  1. 1. National Engineering Research Center for Swine Breeding Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, China
    2. Wens Foodstuff Co., Ltd., Xinxing 527439, China
  • Received:2020-03-04 Revised:2020-04-24 Online:2020-07-20 Published:2020-06-01
  • Contact: Zhang Xianwei E-mail:zxianw@163.com
  • Supported by:
    Supported by the National Transgenic Major Projects No(2016ZX08006002)

Abstract:

Gene-editing technology can artificially modify genetic material of targeted loci by precise insertion, deletion, or replacement in the genomic DNA. In recent years, with the developments of zinc-finger endonuclease (ZFN), transcription activator-like effector nuclease (TALEN), clustered regularly interspaced short palindromic repeats/CRISPR- associated protein 9 (CRISPR/Cas9) technologies, such precise modifications of the animal genomes have become possible. Although gene-editing tools, such as CRISPR/Cas9, can efficiently generate double-strand breaks (DSBs) in mammalian cells, the homology-directed repair (HDR) mediated knock-in (KI) efficiency is extremely low. In this review, we briefly describe the current development of gene-editing tools and summarize the recent strategies to enhance the CRISPR/Cas9- mediated KI efficiency, which will provide a reference for the generation of human disease models, research on gene therapy and livestock genetic improvement.

Key words: gene editing, CRISPR/Cas9, knock in, homology directed repair, non-homologous end joining