Cited by 947CRISPR and Genetic EngineeringRNA regulation and diseaseRNA Interference and Gene Delivery

Genome-wide binding of the CRISPR endonuclease Cas9 in mammalian cells

Open access
Wu, Xuebing, Scott, David A, Kriz, Andrea J, Chiu, Anthony C, Hsu, Patrick D, Dadon, Daniel B, Cheng, Albert W, Trevino, Alexandro E +5 more·2014·Nature Biotechnology

Abstract

Bacterial type II CRISPR-Cas9 systems have been widely adapted for RNA-guided genome editing and transcription regulation in eukaryotic cells, yet their in vivo target specificity is poorly understood. Here we mapped genome-wide binding sites of a catalytically inactive Cas9 (dCas9) from Streptococcus pyogenes loaded with single guide RNAs (sgRNAs) in mouse embryonic stem cells (mESCs). Each of the four sgRNAs we tested targets dCas9 to between tens and thousands of genomic sites, frequently characterized by a 5-nucleotide seed region in the sgRNA and an NGG protospacer adjacent motif (PAM). Chromatin inaccessibility decreases dCas9 binding to other sites with matching seed sequences; thus 70% of off-target sites are associated with genes. Targeted sequencing of 295 dCas9 binding sites in mESCs transfected with catalytically active Cas9 identified only one site mutated above background levels. We propose a two-state model for Cas9 binding and cleavage, in which a seed match triggers binding but extensive pairing with target DNA is required for cleavage.

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Crossref · 10.1038/nbt.2889

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  • Viral transduction for Cas9/sgRNA delivery in cell culture may cause accumulation of off-target mutations.

    “| Delivery methods improvement | Application in cell culture [89–94] | Viral transduction | May cause accumulation of off-target mutations |”

    From Off-target effects in CRISPR/Cas9 gene editing (2023) · cites this paper as [93]

    The Results report one off-target mutation above background among 295 sites tested in mouse embryonic stem cells, and the Discussion cautions that low-frequency indels could complicate some Cas9 applications. The paper describes transfection, not viral transduction, and does not link viral delivery to an accumulation of mutations. No page numbers were provided in our copy. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Plasmid transfection for Cas9/sgRNA delivery in cell culture may cause accumulation of off-target mutations.

    “| Delivery methods improvement | Application in cell culture [89–94] | Plasmid transfection | May cause accumulation of off-target mutations |”

    From Off-target effects in CRISPR/Cas9 gene editing (2023) · cites this paper as [93]

    The Online Methods (Targeted sequencing and indel detection; page unavailable) describe transfecting cultured cells with Cas9 and sgRNA plasmids. The Results and Discussion report an off-target indel above background at one of 295 tested sites, but do not show that mutations accumulate over time or establish a risk specific to plasmid delivery. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • RNP electroporation for Cas9/sgRNA delivery in cell culture eliminates off-target effects.

    “| Delivery methods improvement | Application in cell culture [89–94] | RNP electroporation: Rapid transfection and turnover | Eliminate off-target effects |”

    From Off-target effects in CRISPR/Cas9 gene editing (2023) · cites this paper as [93]

    The Online Methods (Cell culture) say transfections used Lipofectamine 2000, not RNP electroporation. The Results (One of 295 off-target sites is mutated above background) report an off-target mutation, but do not test whether RNP electroporation eliminates off-target effects. Searches for RNP electroporation and ribonucleoprotein delivery found no passage addressing that claim. (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • Transient expression of the nuclease Cas9 through delivery of mRNA allowed for sufficient exposure to the nuclease for gene repair and reduced concerns associated with long-term nuclease exposure.

    “A key feature of our system is the transient expression of the nuclease Cas9, through delivery of mRNA. This allowed for sufficient exposure to the nuclease for gene repair and reduced concerns associated with long-term nuclease exposure34.”
  • DNA binding and cleavage by Cas9 are in some cases uncoupled; Cas9 can bind but not cleave partially complementary sequences and exert epigenomic regulatory effects, which is unpredictable by silicon methods relying on base pairing.

    “And moreover, DNA binding and cleavage by Cas9 are in some cases uncoupled, that is, Cas9 can bind to but not cleave DNA sequences that are partially complementary to sgRNA 49 and exert epigenomic regulatory effects, 43 44 which is unpredictable by silicon methods relying on base pairing.”

    From CRISPR-Cas9: a new and promising player in gene therapy (2015) · cites this paper as [49]

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Research works printed but not linked: 1

  1. [48]Packer MJ Dauncey MP Hunter CA Sequence-dependent DNA structure: tetranucleotide conformational maps J Mol Biol 295 85 103 2000 10623510

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Authors
Wu, X., Scott, D. A., Kriz, A. J., Chiu, A. C., Hsu, P. D., Dadon, D. B., Cheng, A. W., Trevino, A. E., Konermann, S., Chen, S., Jaenisch, R., Zhang, F., & Sharp, P. A.
Affiliations
  • Koch Institute for Integrative Cancer Research At MIT (US)
  • Broad Institute (US)
  • Massachusetts Institute of Technology (US)
  • Whitehead Institute for Biomedical Research (US)
Corresponding author
  • Zhang, Feng
  • Sharp, Phillip A
Venue
Nature Biotechnology
Published
2014-04-20
Volume
32
Issue
7
Pages
670-676
ISSN
  • 0733-222X (ISSN-L)
  • 1087-0156
  • 1546-1696
OpenAlex
W1506494596
Cited by
944
References
47
Citations by year
2026: 26 · 2025: 42 · 2024: 56 · 2023: 61 · 2022: 73 · 2021: 63 · 2020: 75 · 2019: 80 · 2018: 81 · 2017: 97 · 2016: 123 · 2015: 111 · 2014: 54 · 2013: 1
FWCI
52.65
Type
journal article
Language
en
Open access
Locations
  • Nature Biotechnology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-sa)
  • eScholarship (California Digital Library) (submittedVersion)
  • PMC
Funders
  • Howard Hughes Medical Institute
  • National Institute of Mental Health (DP1MH100706)
  • National Cancer Institute (R01CA133404, P01CA042063, P30CA014051, P30-CA-14051, P01 CA 42063)
  • National Institute of General Medical Sciences (R01GM034277, R01 GM34277, R37GM034277, T32GM007287)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK097768)
  • National Center for Chronic Disease Prevention and Health Promotion (1DP1-MH100706)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R37HD045022)
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
Cas9, CRISPR/Cas9, dCas9, genome-wide binding sites, single guide RNA, Streptococcus pyogenes, mouse embryonic stem cells, off-target binding, seed sequence, protospacer adjacent motif, chromatin accessibility, DNA cleavage, target specificity
MeSH terms
Animals, Base Sequence, Binding Sites, Cells, Cultured, Deoxyribonuclease I, DNA-Binding Proteins, Models, Genetic, Molecular Sequence Data, Protein Binding, Genome, Mice, Embryonic Stem Cells, CRISPR-Cas Systems

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