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A Cleavage-Responsive Stem-Loop Hairpin for Assaying Guide RNA Activity.

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Researchers developed GUIDER, a novel system for validating CRISPR-Cas9 guide RNAs. This fluorescent method offers a rapid and quantitative alternative to standard assays for assessing Cas9-mediated DNA cleavage efficiency.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genomic Engineering

Background:

  • CRISPR-Cas9 technology extends beyond genomic engineering.
  • In vitro cleavage assays are standard for validating guide RNAs (gRNAs) directing Cas9 endonuclease.
  • There is a need for alternative, efficient gRNA validation methods.

Purpose of the Study:

  • To develop and validate GUIDER, an alternative system for guide RNA validation.
  • To provide a rapid, simple, and quantitative measure of Cas9-mediated DNA cleavage.

Main Methods:

  • Development of GUIDER, a system featuring a hairpin loop with guanosine-rich and fluorophore units.
  • Utilizing a Cas9 endonuclease complex to cleave GUIDER upon gRNA-directed targeting.
  • Measuring fluorescent emission at 525 nm to indicate successful cleavage.

Main Results:

  • GUIDER successfully detected Cas9-mediated cleavage of its hairpin structure via fluorescent signal.
  • The system was validated using the model gene target mpcsk9.
  • GUIDER identified the most efficient gRNA for cleaving the mpcsk9 gene.

Conclusions:

  • GUIDER offers a novel, fluorescent-based approach for validating CRISPR-Cas9 guide RNAs.
  • Its modular design ensures broad applicability for gRNA validation.
  • The system provides a rapid, simple, and quantitative assessment of Cas9 activity.