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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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Repurposing CRISPR/Cas9 for in situ functional assays.

Abba Malina1, John R Mills, Regina Cencic

  • 1Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6 Canada,;

Genes & Development
|December 4, 2013
PubMed
Summary

CRISPR genome editing enables targeted gene disruption positive selection assays, overcoming RNAi limitations for in situ mutagenesis screens. This method efficiently modifies the Trp53 locus and tracks mutations in cancer models with minimal off-target effects.

Keywords:
CRISPRCas9functional screeninggenome editingp53

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Area of Science:

  • Molecular Biology
  • Genomics
  • Cancer Research

Background:

  • RNA interference (RNAi) with next-generation sequencing is a powerful genetic screening tool in mammalian cells.
  • Limitations exist for RNAi, particularly its incompatibility with in situ mutagenesis screens genome-wide.
  • The p53 pathway is a critical target in cancer research.

Purpose of the Study:

  • To adapt the CRISPR/Cas9 genome-editing system for targeted gene disruption positive selection assays.
  • To demonstrate the feasibility of CRISPR/Cas9 for in situ mutagenesis screens.
  • To validate the system using p53 as a proof-of-principle target.

Main Methods:

  • Utilized novel "all-in-one" lentiviral and retroviral delivery vectors for Cas9 and synthetic guide RNA (sgRNA).
  • Performed drug treatment to select for CRISPR-modified Trp53 locus.
  • Linked Cas9 expression to GFP fluorescence for tracking gene disruption in chemoresistant lymphomas (Eμ-myc mouse model).
  • Conducted deep sequencing analysis of the modified Trp53 locus.

Main Results:

  • Demonstrated robust selection for CRISPR-modified Trp53 locus after drug treatment.
  • Successfully tracked disrupted Trp53 in chemoresistant lymphomas using GFP fluorescence.
  • Deep sequencing revealed a wide spectrum of Trp53 mutants with limited off-target effects.
  • Validated the efficiency and specificity of the CRISPR/Cas9 system.

Conclusions:

  • Established Cas9 genome editing as a powerful and practical approach for positive in situ genetic screens.
  • Showcased the utility of CRISPR/Cas9 for targeted gene disruption and mutation tracking in complex biological systems.
  • Highlighted the potential for genome editing in advancing genetic screening methodologies.