Cited by 672CRISPR and Genetic EngineeringRNA regulation and diseaseRNA Interference and Gene Delivery

Transcriptome-wide off-target RNA editing induced by CRISPR-guided DNA base editors

Open access
Grünewald, Julian, Zhou, Ronghao, Garcia, Sara P., Iyer, Sowmya, Lareau, Caleb A., Aryee, Martin J., Joung, J. Keith·2019·Nature

Abstract

CRISPR-Cas base-editor technology enables targeted nucleotide alterations, and is being increasingly used for research and potential therapeutic applications 1,2. The most widely used cytosine base editors (CBEs) induce deamination of DNA cytosines using the rat APOBEC1 enzyme, which is targeted by a linked Cas protein-guide RNA complex 3,4. Previous studies of the specificity of CBEs have identified off-target DNA edits in mammalian cells 5,6. Here we show that a CBE with rat APOBEC1 can cause extensive transcriptome-wide deamination of RNA cytosines in human cells, inducing tens of thousands of C-to-U edits with frequencies ranging from 0.07% to 100% in 38-58% of expressed genes. CBE-induced RNA edits occur in both protein-coding and non-protein-coding sequences and generate missense, nonsense, splice site, and 5' and 3' untranslated region mutations. We engineered two CBE variants bearing mutations in rat APOBEC1 that substantially decreased the number of RNA edits (by more than 390-fold and more than 3,800-fold) in human cells. These variants also showed more precise on-target DNA editing than the wild-type CBE and, for most guide RNAs tested, no substantial reduction in editing efficiency. Finally, we show that an adenine base editor 7 can also induce transcriptome-wide RNA edits. These results have implications for the use of base editors in both research and clinical settings, illustrate the feasibility of engineering improved variants with reduced RNA editing activities, and suggest the need to more fully define and characterize the RNA off-target effects of deaminase enzymes in base editor platforms.

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  • CBE and ABE create new formats of off-target effects such as RNA editing and sgRNA-independent DNA editing.

    “they create new formats of off-target effects such as RNA editing and sgRNA-independent DNA editing”

    From Off-target effects in CRISPR/Cas9 gene editing (2023) · cites this paper as Grünewald et al., 2019

    The main text reports extensive off-target RNA editing by both CBEs and ABEs. It describes the BE3 RNA edits—not DNA edits—as gRNA-independent, and reports that 98.52% of the examined RNA-edited cytosines showed no DNA editing. Thus, this source supports the RNA-editing example but not the claim of sgRNA-independent DNA editing. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • These methods have been used in cultured cells but are not yet ready for clinical use until specificity and delivery are addressed.

    “While these methods have been used in cultured cells, they are not yet ready for clinical use until matters of specificity 33,34 and delivery are addressed.”

    From The promise and challenge of therapeutic genome editing (2020) · cites this paper as [33]

  • RNA off-target effects can be detected by RNA-seq.

    “The RNA off-target effects can be detected by RNA-seq”

    From Off-target effects in CRISPR/Cas9 gene editing (2023) · cites this paper as Grünewald et al., 2019

  • CBE and ABE greatly reduce classic off-target effects of CRISPR/Cas9 systems.

    “Although CBE and ABE greatly reduce the classic off-target effects of CRISPR/Cas9 systems”

    From Off-target effects in CRISPR/Cas9 gene editing (2023) · cites this paper as Grünewald et al., 2019

    The main text reports extensive off-target RNA editing by both CBEs and ABEs and says base-editor off-target effects can be more multidimensional than those of gene-editing nucleases (page unavailable). It does not say that CBEs and ABEs greatly reduce classic CRISPR/Cas9 off-target effects. Searches for comparisons with nuclease off-target effects and double-strand breaks did not establish that claim. (LLM, conf=0.73)

    Experimental — accuracy not yet measured
  • RNA editing systems induce transient conversions, potentially minimising undesired physiological changes compared to DNA editing.

    “These systems induce transient conversions, potentially minimising undesired physiological changes compared to DNA editing. 90”

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Authors
Grünewald, J., Zhou, R., Garcia, S. P., Iyer, S., Lareau, C. A., Aryee, M. J., & Joung, J. K.
Affiliations
  • Harvard University (US)
  • Massachusetts General Hospital (US)
Corresponding author
Joung, J. Keith
Venue
Nature
Published
2019-04-17
Volume
569
Issue
7756
Pages
433-437
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2939749480
Cited by
663
References
37
Citations by year
2026: 66 · 2025: 74 · 2024: 80 · 2023: 100 · 2022: 84 · 2021: 106 · 2020: 104 · 2019: 48
FWCI
28.72
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Human Genome Research Institute (RM1HG009490)
  • National Institute of General Medical Sciences (R35GM118158)
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
Keywords
cytosine base editors, APOBEC1, RNA editing, off-target effects, adenine base editors, deaminase activity, human cells
MeSH terms
APOBEC-1 Deaminase, Gene Editing, Animals, Base Sequence, Cytosine, Deamination, Humans, Mutation, RNA, Substrate Specificity, RNA Editing, Rats, Hep G2 Cells, HEK293 Cells, Transcriptome, CRISPR-Cas Systems

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