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Methods Favoring Homology-Directed Repair Choice in Response to CRISPR/Cas9 Induced-Double Strand Breaks

Yang, Han, Ren, Shuling, Yu, Siyuan, Pan, Haifeng, Li, Tingdong, Ge, Shengxiang, Zhang, Jun, Xia, Ningshao·2020·International Journal of Molecular Sciences

Abstract

Precise gene editing is—or will soon be—in clinical use for several diseases, and more applications are under development. The programmable nuclease Cas9, directed by a single-guide RNA (sgRNA), can introduce double-strand breaks (DSBs) in target sites of genomic DNA, which constitutes the initial step of gene editing using this novel technology. In mammals, two pathways dominate the repair of the DSBs—nonhomologous end joining (NHEJ) and homology-directed repair (HDR)—and the outcome of gene editing mainly depends on the choice between these two repair pathways. Although HDR is attractive for its high fidelity, the choice of repair pathway is biased in a biological context. Mammalian cells preferentially employ NHEJ over HDR through several mechanisms: NHEJ is active throughout the cell cycle, whereas HDR is restricted to S/G2 phases; NHEJ is faster than HDR; and NHEJ suppresses the HDR process. This suggests that definitive control of outcome of the programmed DNA lesioning could be achieved through manipulating the choice of cellular repair pathway. In this review, we summarize the DSB repair pathways, the mechanisms involved in choice selection based on DNA resection, and make progress in the research investigating strategies that favor Cas9-mediated HDR based on the manipulation of repair pathway choice to increase the frequency of HDR in mammalian cells. The remaining problems in improving HDR efficiency are also discussed. This review should facilitate the development of CRISPR/Cas9 technology to achieve more precise gene editing.

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  • In CRISPR-gene editing, HDR requires a large amount of donor (exogenous) DNA templates containing a sequence of interest.

    “In CRISPR-gene editing, HDR requires a large amount of donor (exogenous) DNA templates containing a sequence of interest.”
  • HDR is most active in the late S and G2 phases of the cell cycle.

    “It is most active in the late S and G2 phases of the cell cycle.”
  • HDR executes the precise gene insertion or replacement by adding a donor DNA template with sequence homology at the predicted DSB site.

    “HDR executes the precise gene insertion or replacement by adding a donor DNA template with sequence homology at the predicted DSB site.16,17”
  • HDR is highly precise and requires the use of a homologous DNA template.

    “HDR is highly precise and requires the use of a homologous DNA template.”
  • NHEJ is an error-prone mechanism that may result in small random insertion or deletion (indels) at the cleavage site leading to the generation of frameshift mutation or premature stop codon.

    “It is the predominant and efficient cellular repair mechanism that is most active in the cells, but it is an error-prone mechanism that may result in small random insertion or deletion (indels) at the cleavage site leading to the generation of frameshift mutation or premature stop codon.17”

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Metadata

Authors
Yang, H., Ren, S., Yu, S., Pan, H., Li, T., Ge, S., Zhang, J., & Xia, N.
Affiliations
State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Disease, Collaborative Innovation Centers of Biological Products, School of Public Health, Xiamen University, Xiamen 361102, China
Venue
International Journal of Molecular Sciences
Publisher
MDPI AG
Published
2020-09-04
Volume
21
Issue
18
Pages
6461
ISSN
1422-0067
Cited by
237
References
8
Language
en
Funders
  • National Natural Science Foundation of China (31971369)
  • National Key Program for Infectious Disease of China (2018ZX10732401-003-008)
  • Natural Science Foundation of Fujian Province of China (Natural Science Foundation of Fujian Province of China)

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