Cited by 1,883CRISPR and Genetic EngineeringRNA regulation and diseaseDNA Repair Mechanisms

Repair of double-strand breaks induced by CRISPR–Cas9 leads to large deletions and complex rearrangements

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Kosicki, Michael, Tomberg, Kärt, Bradley, Allan·2018·Nature Biotechnology

Abstract

CRISPR-Cas9 is poised to become the gene editing tool of choice in clinical contexts. Thus far, exploration of Cas9-induced genetic alterations has been limited to the immediate vicinity of the target site and distal off-target sequences, leading to the conclusion that CRISPR-Cas9 was reasonably specific. Here we report significant on-target mutagenesis, such as large deletions and more complex genomic rearrangements at the targeted sites in mouse embryonic stem cells, mouse hematopoietic progenitors and a human differentiated cell line. Using long-read sequencing and long-range PCR genotyping, we show that DNA breaks introduced by single-guide RNA/Cas9 frequently resolved into deletions extending over many kilobases. Furthermore, lesions distal to the cut site and crossover events were identified. The observed genomic damage in mitotically active cells caused by CRISPR-Cas9 editing may have pathogenic consequences.

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Crossref · 10.1038/nbt.4192

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  • Inaccurate (off-target) genome editing occurs when CRISPR-induced DNA cleavage and repair happens at genomic locations not intended for modification, typically sites close in sequence to the intended editing site.

    “Inaccurate (off-target) genome editing occurs when CRISPR-induced DNA cleavage and repair happens at genomic locations not intended for modification, typically sites that are close in sequence to the intended editing site (reviewed in ref. 93).”

    From The promise and challenge of therapeutic genome editing (2020) · cites this paper as [93]

    The Abstract distinguishes targeted sites from distal off-target sequences, and its discussion of prior assessments mentions potential off-target sites. These passages support the distinction between intended and off-target editing, but do not say that off-target sites are typically close in sequence to the intended site (no page number is available in our copy). (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • Substantial deletions or rearrangements of chromosomes have also been observed in CRISPR editing due to repairs facilitated by mechanisms such as homology-directed repair or single-strand annealing within cells.

    “Nonetheless, substantial deletions or rearrangements of chromosomes have also been observed in CRISPR editing due to repairs facilitated by mechanisms such as homology-directed repair or single-strand annealing within cells.”

    From Machine learning-based prediction models to guide the selection of Cas9 variants for efficient gene editing (2024) · cites this paper as [56]

    The Abstract reports large deletions and complex genomic rearrangements after CRISPR–Cas9 editing in the cell types studied. A further passage, indexed under Abstract, suggests inter-homologue strand invasion for two recombinant alleles, but the paper does not establish homology-directed repair or single-strand annealing as the mechanisms causing the substantial deletions or rearrangements claimed here. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Kosicki et al. observed large deletions up to 6kb and other complex genomic lesions at frequencies of 5-20% of clones after targeting PigA and Cd9 loci in mESC lines and primary mouse cells, and PIGA in human RPE cells.

    “Consistent with this, Kosicki and colleagues observed large deletions (up to 6kb) and other complex genomic lesions at frequencies of 5-20% of their clones after targeting the PigA and Cd9 loci in two mouse embryonic stem cell (mESC) lines and primary mouse cells from the bone marrow, as well as the PIGA gene in immortalised human female retinal pigment epithelial cells (12).”

    From Frequent loss of heterozygosity in CRISPR-Cas9–edited early human embryos (2021) · cites this paper as [12]

    The paper reports deletions up to 6 kb in PigA-deficient mouse ES-cell clones and documents complex lesions at PigA, Cd9 and human RPE1 PIGA (passages labeled Abstract; no page supplied). But 5–20% refers to PigA loss after particular intronic guides, not the frequency of these lesions across all clones and cell types. In primary mouse bone-marrow cells, the target was GFP, and large deletions were found in 35 of 96 selected clones—not 5–20%. (LLM, conf=0.91)

    Experimental — accuracy not yet measured
  • Repair of DSBs introduced by Cas9 has been shown to be error prone and may result in complex rearrangements, including chromothripsis, at the site of repair.

    “The repair of DSBs introduced by Cas9 has been shown to be error prone and may result in complex rearrangements, including chromothripsis, at the site of repair25–27.”

    From One-step generation of tumor models by base editor multiplexing in adult stem cell-derived organoids (2023) · cites this paper as [26]

    The Abstract reports on-target mutagenesis and complex genomic rearrangements following Cas9-induced breaks, supporting the claim that repair can be error prone. Our copy does not identify chromothripsis as one of those outcomes, so that specific example is not supported by this source. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Variability of NHEJ-mediated repair outcomes plagues non-coding CRISPR screens with unprogrammed editing outcomes.

    “Additional challenges include that the variability of NHEJ-mediated repair outcomes plagues these screens with unprogrammed editing outcomes204,206”

    From Towards a comprehensive catalogue of validated and target-linked human enhancers (2020) · cites this paper as [206]

    The paper reports diverse, unprogrammed outcomes after Cas9 cutting, including large deletions, inversions and lesions away from the cut site; it also finds that intronic guides can cause unexpected gene loss (paper text labeled Abstract; page unavailable). It does not establish that NHEJ specifically causes these outcomes or directly assess their impact on non-coding CRISPR screens. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Authors
Kosicki, M., Tomberg, K., & Bradley, A.
Affiliations
Wellcome Sanger Institute (GB)
Corresponding author
Bradley, Allan
Venue
Nature Biotechnology
Published
2018-07-16
Volume
36
Issue
8
Pages
765-771
ISSN
  • 0733-222X (ISSN-L)
  • 1087-0156
  • 1546-1696
OpenAlex
W2883697525
Cited by
1,883
References
38
Citations by year
2026: 227 · 2025: 177 · 2024: 199 · 2023: 215 · 2022: 209 · 2021: 244 · 2020: 264 · 2019: 254 · 2018: 94
FWCI
76.10
Type
journal article
Language
en
Update notices
erratum (2018-10-01)
Open access
Locations
  • Nature Biotechnology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
Wellcome Trust (079643, 098051)
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 › DNA Repair Mechanisms
Keywords
CRISPR/Cas9, DNA double-strand break repair, large deletions, genome rearrangement, crossover events, single guide RNA, mouse embryonic stem cells, hematopoietic progenitor cells, gene editing specificity, off-target effects
MeSH terms
Animals, Genotype, Humans, Polymerase Chain Reaction, Mutagenesis, Sequence Deletion, Mice, DNA Breaks, Double-Stranded, CRISPR-Cas Systems

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