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A Cas-embedding strategy for minimizing off-target effects of DNA base editors

Author

Listed:
  • Yajing Liu

    (ShanghaiTech University
    Chinese Academy of Sciences)

  • Changyang Zhou

    (Chinese Academy of Sciences)

  • Shisheng Huang

    (ShanghaiTech University
    University of Chinese Academy of Sciences)

  • Lu Dang

    (Cancer Hospital and Institute of Guangzhou Medical University)

  • Yu Wei

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jun He

    (ShanghaiTech University
    University of Chinese Academy of Sciences)

  • Yingsi Zhou

    (Chinese Academy of Sciences)

  • Shaoshuai Mao

    (Chinese Academy of Sciences)

  • Wanyu Tao

    (ShanghaiTech University
    University of Chinese Academy of Sciences)

  • Yu Zhang

    (ShanghaiTech University)

  • Hui Yang

    (Chinese Academy of Sciences)

  • Xingxu Huang

    (ShanghaiTech University)

  • Tian Chi

    (ShanghaiTech University)

Abstract

DNA base editors, typically comprising editing enzymes fused to the N-terminus of nCas9, display off-target effects on DNA and/or RNA, which have remained an obstacle to their clinical applications. Off-target edits are typically countered via rationally designed point mutations, but the approach is tedious and not always effective. Here, we report that the off-target effects of both A > G and C > T editors can be dramatically reduced without compromising the on-target editing simply by inserting the editing enzymes into the middle of nCas9 at tolerant sites identified using a transposon-based genetic screen. Furthermore, employing this Cas-embedding strategy, we have created a highly specific editor capable of efficient C > T editing at methylated and GC-rich sequences.

Suggested Citation

  • Yajing Liu & Changyang Zhou & Shisheng Huang & Lu Dang & Yu Wei & Jun He & Yingsi Zhou & Shaoshuai Mao & Wanyu Tao & Yu Zhang & Hui Yang & Xingxu Huang & Tian Chi, 2020. "A Cas-embedding strategy for minimizing off-target effects of DNA base editors," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19690-0
    DOI: 10.1038/s41467-020-19690-0
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    Cited by:

    1. Yuting Chen & Eriona Hysolli & Anlu Chen & Stephen Casper & Songlei Liu & Kevin Yang & Chenli Liu & George Church, 2022. "Multiplex base editing to convert TAG into TAA codons in the human genome," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    2. Shuqian Zhang & Bo Yuan & Jixin Cao & Liting Song & Jinlong Chen & Jiayi Qiu & Zilong Qiu & Xing-Ming Zhao & Jingqi Chen & Tian-Lin Cheng, 2023. "TadA orthologs enable both cytosine and adenine editing of base editors," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    3. Nathan Bamidele & Han Zhang & Xiaolong Dong & Haoyang Cheng & Nicholas Gaston & Hailey Feinzig & Hanbing Cao & Karen Kelly & Jonathan K. Watts & Jun Xie & Guangping Gao & Erik J. Sontheimer, 2024. "Domain-inlaid Nme2Cas9 adenine base editors with improved activity and targeting scope," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    4. Jianli Tao & Daniel E. Bauer & Roberto Chiarle, 2023. "Assessing and advancing the safety of CRISPR-Cas tools: from DNA to RNA editing," Nature Communications, Nature, vol. 14(1), pages 1-16, December.
    5. Shuqian Zhang & Liting Song & Bo Yuan & Cheng Zhang & Jixin Cao & Jinlong Chen & Jiayi Qiu & Yilin Tai & Jingqi Chen & Zilong Qiu & Xing-Ming Zhao & Tian-Lin Cheng, 2023. "TadA reprogramming to generate potent miniature base editors with high precision," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    6. Daniel C. Volke & Román A. Martino & Ekaterina Kozaeva & Andrea M. Smania & Pablo I. Nikel, 2022. "Modular (de)construction of complex bacterial phenotypes by CRISPR/nCas9-assisted, multiplex cytidine base-editing," Nature Communications, Nature, vol. 13(1), pages 1-14, December.

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