Cited by 159CRISPR and Genetic EngineeringRNA regulation and diseaseCAR-T cell therapy research

Rationally designed APOBEC3B cytosine base editors with improved specificity

Open access
Jin, Shuai, Fei, Hongyuan, Zhu, Zixu, Luo, Yingfeng, Liu, Jinxing, Gao, Shenghan, Zhang, Feng, Chen, Yu-Hang +2 more·2020·Molecular Cell

Abstract

Cytosine base editors (CBEs) generate C-to-T nucleotide substitutions in genomic target sites without inducing double-strand breaks. However, CBEs such as BE3 can cause genome-wide off-target changes via sgRNA-independent DNA deamination. By leveraging the orthogonal R-loops generated by SaCas9 nickase to mimic actively transcribed genomic loci that are more susceptible to cytidine deaminase, we set up a high-throughput assay for assessing sgRNA-independent off-target effects of CBEs in rice protoplasts. The reliability of this assay was confirmed by the whole-genome sequencing (WGS) of 10 base editors in regenerated rice plants. The R-loop assay was used to screen a series of rationally designed A3Bctd-BE3 variants for improved specificity. We obtained 2 efficient CBE variants, A3Bctd-VHM-BE3 and A3Bctd-KKR-BE3, and the WGS analysis revealed that these new CBEs eliminated sgRNA-independent DNA off-target edits in rice plants. Moreover, these 2 base editor variants were more precise at their target sites by producing fewer multiple C edits.

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Crossref · 10.1016/j.molcel.2020.07.005

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  • sgRNA-independent DNA editing is likely deposited on loci where DNA unwinds into an R-loop so single-strand genomic DNA is exposed to deaminases.

    “The sgRNA-independent DNA editing is likely deposited on loci where DNA unwinds into an R-loop so single-strand genomic DNA is exposed to deaminases”

    From Off-target effects in CRISPR/Cas9 gene editing (2023) · cites this paper as Jin et al., 2020

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Authors
Jin, S., Fei, H., Zhu, Z., Luo, Y., Liu, J., Gao, S., Zhang, F., Chen, Y.-H., Wang, Y., & Gao, C.
Affiliations
  • Chinese Academy of Sciences (CN)
  • University of Minnesota (US)
Corresponding author
  • Wang, Yanpeng
  • Gao, Caixia
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2020-09
Volume
79
Issue
5
Pages
728-740.e6
ISSN
1097-2765 (ISSN-L)
OpenAlex
W3044710522
Cited by
159
References
51
Citations by year
2026: 12 · 2025: 22 · 2024: 15 · 2023: 43 · 2022: 29 · 2021: 32 · 2020: 6
FWCI
9.08
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Transgenic Science and Technology Program (2019ZX08010-003, 2019ZX08010-001)
  • Strategic Priority Research Program of the CAS (XDA24020102)
  • National Natural Science Foundation of China (31788103)
  • Youth Innovation Promotion Association of the Chinese Academy of Sciences
  • United Soybean Board (1920-152-0131-B)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
  • Health Sciences › Medicine › Oncology › CAR-T cell therapy research
Keywords
APOBEC3B, cytosine base editors, BE3, off-target editing, R-loops, cytidine deamination, rational design, rice protoplasts, whole genome sequencing, genome editing specificity
MeSH terms
Gene Editing, RNA, Guide, CRISPR-Cas Systems, Cytidine Deaminase, Cytosine, Humans, Mutation, Oryza, Reproducibility of Results, Minor Histocompatibility Antigens, Genes, Plant, RNA, Guide, Kinetoplastida, RNA, Plant

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