Cited by 3,696CRISPR and Genetic EngineeringRNA Interference and Gene DeliveryRNA regulation and disease

CRISPR-Mediated Modular RNA-Guided Regulation of Transcription in Eukaryotes

Open access
Gilbert, Luke A., Larson, Matthew H., Morsut, Leonardo, Liu, Zairan, Brar, Gloria A., Torres, Sandra E., Stern-Ginossar, Noam, Brandman, Onn +5 more·2013·Cell

Abstract

The genetic interrogation and reprogramming of cells requires methods for robust and precise targeting of genes for expression or repression. The CRISPR-associated catalytically inactive dCas9 protein offers a general platform for RNA-guided DNA targeting. Here, we show that fusion of dCas9 to effector domains with distinct regulatory functions enables stable and efficient transcriptional repression or activation in human and yeast cells, with the site of delivery determined solely by a coexpressed short guide (sg)RNA. Coupling of dCas9 to a transcriptional repressor domain can robustly silence expression of multiple endogenous genes. RNA-seq analysis indicates that CRISPR interference (CRISPRi)-mediated transcriptional repression is highly specific. Our results establish that the CRISPR system can be used as a modular and flexible DNA-binding platform for the recruitment of proteins to a target DNA sequence, revealing the potential of CRISPRi as a general tool for the precise regulation of gene expression in eukaryotic cells.

Integrity signals

Registry

Crossref · 10.1016/j.cell.2013.06.044

Cites

46 of 46 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 5 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    Fusing dCas9 to effector domains allows stable and efficient repression or activation of transcription in human and yeast cells, with the target site determined by a co-expressed short guide RNA.

    “Here we show that fusion of dCas9 to effector domains with distinct regulatory functions enables stable and efficient transcriptional repression or activation in human and yeast cells with the site of delivey determined solely by a co-expressed short guide (sg)RNA.”
    Quote in the paperSubstantial claim
  • Findingown data

    CRISPRi can simultaneously knock down endogenous CD71 and CXCR4 in HeLa cells.

    “In this experiment we found that we can simultaneously knock down endogenous expression of CD71 and CXCR4 (Figure 3E).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The fluorescent antibodies used to stain CD71 and CXCR4 are specific for those proteins.
  • Findingown data

    In yeast, dCas9 blocks rtTA from binding to the TetONVenus reporter, causing 115-fold repression.

    “Without dCas9, rtTA strongly activated the reporter, but this induction can be effectively blocked by dCas9 (115 fold repression, Figure 4B).”
    Quote in the paperSubstantial claim
  • Findingown data

    Stable lentivirus-mediated expression of both sgRNA and dCas9 or dCas9-KRAB efficiently and stably knocks down CD71 and CXCR4 in HeLa cells.

    “Our data show CD71 and CXCR4 can be efficiently and stably knocked down (Figure 3C–D), providing evidence that CRISPRi can be used like RNAi to suppress endogenous gene expression.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The fluorescent antibodies used to stain CD71 and CXCR4 are specific for those proteins.
  • Findingown data

    The degree of knockdown for dCas9 and dCas9-KRAB on endogenous genes is strongly correlated.

    “Interestingly, a strong correlation exists between the degree of knockdown for dCas9 and dCas9-KRAB for endogenous genes”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The fluorescent antibodies used to stain CD71 and CXCR4 are specific for those proteins.
  • May combine two claims. 14
  • Classified as probably not a substantial claim. 7
  • May combine two claims.

    Findingown data

    In GFP+ HEK293 reporter cells, dCas9-KRAB reduces GFP signal about 5-fold, whereas dCas9 alone, dCas9-CS, and dCas9-WRPW reduce it about 2-fold.

    “We found that cells expressing the dCas9-KRAB fusion protein show a 5-fold decrease in GFP signal while cells expressing dCas9 alone, dCas9-CS or dCas9-WRPW show a 2-fold decrease in GFP signal”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Expression of sgGAL4 or sgGFP-NT1 alone produces no significant on- or off-target effects.

    “We also found no evidence for significant on- or off-target effects due to expression of either sgGAL4 or sgGFP-NT1 alone (Figure S3B).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    dCas9-KRAB efficiently represses GFP when targeted to cis-acting proximal elements within the SV40 early promoter, whereas dCas9 alone has no effect.

    “We found that while dCas9 alone had no effect on transcription, we efficiently repressed GFP expression with dCas9-KRAB (Figure 4A).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Among 9 sgRNAs targeting GFP, 6 reduce GFP expression by at least 75%, and the best sgRNA (NT1) gives about 15-fold repression.

    “We observed that 6 out of 9 sgRNAs targeting GFP knocked down GFP expression by at least 75% with a ~15-fold repression for the best sgRNA (NT1) (Table S1).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Stable dCas9-KRAB expression silences GFP in HEK293 cells, with substantial knockdown 3 days after sgRNA transfection and strong silencing 6 days after transfection.

    “We found that stable dCas9-KRAB expression is sufficient to silence GFP with substantial knockdown 3 days following transfection (Figure S1A–B) and strong silencing 6 days following transfection (Figure 1C).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    CRISPRi-mediated repression is highly specific: RNA-seq shows GFP is the only gene significantly suppressed by the GFP-targeting sgRNA, and no other gene changes by more than 1.5 fold on average across two biological replicates.

    “Our results show that CRISPRi is highly specific as GFP is the only gene that is significantly suppressed by the GFP-targeting sgRNA (Figure 2 and Figure S3A). If we average the data from two independent biological replicates, no gene other than GFP changes by more than 1.5 fold.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    In Saccharomyces cerevisiae, dCas9 alone represses TEF1-GFP 18-fold, and adding the Mxi1 domain increases repression to 53-fold.

    “With dCas9 alone, we observed 18-fold repression, which is increased to 53-fold with addition of the Mxi1 domain (Figure 3F).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    dCas9 is completely nucleolytically inactive: GFP knockdown cells retain wild-type GFP sequence with no detectable indels.

    “We sequenced the GFP reporter locus in these cells to confirm that dCas9 is completely nucleolytically inactive. Here, GFP retained a wild type sequence with no detectable indels in GFP knockdown cells.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Both dCas9 and dCas9-KRAB knock down endogenous CD71 and CXCR4 in HeLa cells, with 3 out of 10 sgRNAs per gene giving significant repression of 60-80%.

    “In this experiment we found that both dCas9 and dCas9-KRAB proteins can knock down endogenous expression of CD71 and CXCR4 (Figure 3A–B), with 3 out of 10 sgRNAs for each gene showing significant repression (60–80% repression).”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The fluorescent antibodies used to stain CD71 and CXCR4 are specific for those proteins.
  • May combine two claims.

    Findingown data

    dCas9 can be directed to endogenous genes as well as reporter genes.

    “While we are able to target dCas9 to both endogenous and reporter genes, not all sgRNA targeting constructs work efficiently.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Interpretationown data

    The design of the fusion protein or fusion partner is an important parameter for future optimization.

    “arguing that the design of the fusion protein or fusion partner is an important parameter for future optimization efforts.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationown data

    dCas9 may not directly block transcription initiation, but dCas9 fusion proteins can silence proximal regulatory elements within a promoter by recruiting chromatin modifiers.

    “This suggests that while dCas9 may not be able to directly block the initiation of transcription, dCas9 fusion proteins can silence proximal regulatory elements within a promoter by recruiting chromatin modifiers.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    How specific CRISPRi is across many different sgRNA sequences has not yet been established.

    “The specificity of CRISPRi remains to be determined across a broad range of sgRNA sequences.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    In human cells, the local chromatin environment strongly influences silencing mediated by KRAB.

    “In human cells, previous work has demonstrated that local chromatin context is a crucial determinant of KRAB mediated silencing.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Groner et al., 2010 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Specific transcriptional modulation may be easier than genome editing, since most of the human genome is neither transcribed nor needed for transcription control, so dCas9 occupancy at near-cognate sites often would not alter transcription.

    “Nonetheless, it may be substantially easier to specifically modulate transcription as only a small fraction of the human genome is transcribed or required for controlling transcription thus binding of catalytically inactive dCas9, and it is derivatives, at near cognate sites will often not impact transcription.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Only a small fraction of the human genome is transcribed or required for controlling transcription.
  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning

    Because CRISPRi is exogenous, it avoids competition with endogenous pathways like microRNA expression and function.

    “As an exogenous system, CRISPRi does not compete with endogenous machinery such as microRNA expression or function.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Interpretationnone given

    Introns are theoretically targetable by CRISPRi.

    “as we show that promoters and in theory introns can also be targeted.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    KRAB domain recruitment near a genomic region may either fail to affect transcription or fully silence it.

    “For example, recruitment of the KRAB domain to adjacent genomic regions can have no effect or can completely silence transcription (Groner et al., 2010).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Groner et al., 2010 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    About 80% of tested genes were silenceable through KRAB-mediated recruitment of Kap1 and HP1.

    “Nonetheless, an exon trapping strategy in which Tet binding sites were randomly inserted in the genome allowing recruitment of a Tetracycline repressor-KRAB fusion protein revealed that ~80% of genes tested can be silenced by KRAB-mediated recruitment of Kap1 and HP1 proteins (Groner et al., 2010).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Groner et al., 2010 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductown data

    Each yeast experiment used three replicate cultures, with error bars showing standard deviation.

    “Triplicate cultures were measured for each experiment and their standard deviation was indicated as the error bar.”
    Quote in the paperNot a substantial claim
20 of 20
  • The paper relies on this without support.

    The fluorescent antibodies used to stain CD71 and CXCR4 are specific for those proteins.

    “We designed sgRNAs to target genes encoding cell surface transmembrane proteins, enabling us to use flow cytometry with directly conjugated fluorescent antibodies to quantify gene expression at the single-cell level.”
  • The paper relies on this without support.

    Only a small fraction of the human genome is transcribed or required for controlling transcription.

    “only a small fraction of the human genome is transcribed or required for controlling transcription”
  • The paper relies on this without support.

    CRISPRi acts at the DNA level.

    “because CRISPRi acts at the DNA level”
3 of 3

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • CRISPRi and CRISPRa technologies utilize catalytically inactive Cas9 (dCas9) fused to either a transcriptional repressor (e.g., KRAB) or a transcriptional activator (e.g., VPR).

    “For example, CRISPRi (interference)23–25 and CRISPRa (activation)26–30 technologies utilize catalytically inactive Cas9 (dCas9) fused to either a transcriptional repressor (e.g., KRAB, Krüppel associated box) or a transcriptional activator (e.g., VPR, VP64-p65-Rta).”

    From Large-scale CRISPR screening in primary human 3D gastric organoids enables comprehensive dissection of gene-drug interactions (2025) · cites this paper as [23]

    The Results section, “dCas9 fusion proteins can efficiently activate or silence transcription” (page not supplied), describes dCas9-KRAB for repression and dCas9-VP64 or dCas9-p65AD for activation. It supports the general claim about dCas9 fused to transcriptional effectors, but does not describe the specific VPR (VP64-p65-Rta) activator named in the citing sentence. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • NIST manages a scientific consortium aimed at measuring and standardizing genome editing outcomes as technology advances.

    “The National Institute of Standards and Technology (NIST) manages a scientific consortium aimed at measuring and standardizing such outcomes as genome editing technology advances 100 .”

    From The promise and challenge of therapeutic genome editing (2020) · cites this paper as [100]

    The Discussion section on future CRISPRi optimization addresses improvements to genome-editing tools, not NIST or a standards consortium. Searches for NIST and for a consortium measuring or standardizing genome-editing outcomes found no passage addressing the claim in our copy. (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • CRISPR/Cas9 is a naturally occurring bacterial immune system that protects bacteria from phage infection and has been harnessed for genome-engineering applications.

    “Clustered regularly interspaced short palindromic repeat (CRISPR)/Cas9 is a naturally occurring bacterial immune system that uses a novel nuclease system to protect bacteria from phage infection (6-9), and it has recently been harnessed for a variety of genome-engineering applications (10)(11)(12)(13)(14)(15)(16)(17).”

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Authors
Gilbert, L. A., Larson, M. H., Morsut, L., Liu, Z., Brar, G. A., Torres, S. E., Stern-Ginossar, N., Brandman, O., Whitehead, E. H., Doudna, J. A., Lim, W. A., Weissman, J. S., & Qi, L. S.
Affiliations
  • QB3 (US)
  • Howard Hughes Medical Institute (US)
  • Peking University (CN)
Corresponding author
Weissman, Jonathan S.
Venue
Cell
Publisher
Elsevier BV
Published
2013-07
Volume
154
Issue
2
Pages
442-451
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2101749257
Cited by
3,696
References
46
Citations by year
2026: 195 · 2025: 260 · 2024: 298 · 2023: 286 · 2022: 316 · 2021: 374 · 2020: 387 · 2019: 332 · 2018: 328 · 2017: 286 · 2016: 256 · 2015: 187 · 2014: 161 · 2013: 28
FWCI
94.43
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Science Foundation (U01 CA168370, P50 GM102706, 0540879)
  • Howard Hughes Medical Institute
  • National Institutes of Health (GM102706, GM081879)
  • University of California, San Francisco (GM081879)
  • National Cancer Institute (U01CA168370)
  • National Institute of General Medical Sciences (P50GM081879, P50GM102706, GM081879, F32GM100611, GM102706)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
Keywords
CRISPR interference, dCas9, transcriptional repression, transcriptional activation, gene silencing, CRISPR/Cas9
MeSH terms
Bacterial Proteins, HeLa Cells, Humans, Saccharomyces cerevisiae, Streptococcus pyogenes, Gene Targeting, HEK293 Cells, RNA, Small Untranslated

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