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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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CRISPR interference (CRISPRi) for sequence-specific control of gene expression.

Matthew H Larson1, Luke A Gilbert, Xiaowo Wang

  • 11] Department of Cellular and Molecular Pharmacology, University of California, San Francisco (UCSF), San Francisco, California, USA. [2] Howard Hughes Medical Institute, UCSF, San Francisco, California, USA. [3] California Institute for Quantitative Biomedical Research, San Francisco, California, USA.

Nature Protocols
|October 19, 2013
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Summary
This summary is machine-generated.

CRISPR interference (CRISPRi) offers a simple RNA-based method for targeted gene silencing. This protocol details designing and expressing guide RNAs for CRISPRi, enabling rapid gene repression and functional studies.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Genome-wide gene expression control is crucial for understanding gene function and engineering regulatory systems.
  • CRISPR interference (CRISPRi) is an RNA-based method for targeted transcriptional silencing.
  • The CRISPRi system utilizes a catalytically inactive Cas9 protein and a customizable single guide RNA (sgRNA).

Purpose of the Study:

  • To provide a protocol for designing, constructing, and expressing customized sgRNAs for CRISPRi.
  • To detail methods for testing CRISPRi repression activity.
  • To enable rapid gene repression for functional genomics studies.

Main Methods:

  • Design, construction, and expression of customized single guide RNAs (sgRNAs).
  • Utilizing a catalytically inactive Cas9 protein.
  • Quantitative fluorescence assays and native elongating transcript sequencing for activity testing.

Main Results:

  • A simplified protocol for rapid gene repression (1-2 weeks) using CRISPRi.
  • Demonstration of CRISPRi's effectiveness in targeted gene silencing.
  • Adaptability of the method for high-throughput genome-wide studies.

Conclusions:

  • CRISPRi provides an efficient and accessible tool for sequence-specific gene silencing.
  • The protocol facilitates the study of gene function and genetic interactions.
  • CRISPRi serves as a valuable complement to RNA interference in various organisms.