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Using a Fluorescent PCR-capillary Gel Electrophoresis Technique to Genotype CRISPR/Cas9-mediated Knockout Mutants in a High-throughput Format
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Genotyping with CRISPR-Cas-derived RNA-guided endonucleases.

Jong Min Kim1, Daesik Kim1, Seokjoong Kim2

  • 1National Creative Initiatives Research Center for Genome Engineering, Department of Chemistry, Seoul National University, Gwanak-gu, Seoul 151-747, South Korea.

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|January 22, 2014
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Summary

This study introduces a novel CRISPR/Cas-derived RNA-guided engineered nucleases (RGENs) method for restriction fragment length polymorphism (RFLP) analysis. This RGEN-mediated RFLP enhances genotyping accuracy for mutations and insertions/deletions.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Restriction fragment length polymorphism (RFLP) is a traditional genotyping method limited by restriction enzyme site availability.
  • Existing methods for genotyping engineered nuclease-induced mutations, like T7 endonuclease I and Surveyor assays, have limitations.

Purpose of the Study:

  • To develop a novel RFLP analysis method utilizing CRISPR/Cas-derived RNA-guided engineered nucleases (RGENs).
  • To genotype recurrent mutations in cancer and small insertions/deletions (indels) induced by engineered nucleases.

Main Methods:

  • Preparation of RGENs by complexing Streptococcus pyogenes Cas9 protein with guide RNAs complementary to target DNA sequences.
  • Application of RGEN-mediated RFLP for genotyping induced mutations in cultured cells and animals.
  • Comparison with T7 endonuclease I and Surveyor assays.

Main Results:

  • RGEN-mediated RFLP analysis successfully genotyped recurrent cancer mutations and induced indels.
  • This novel method can detect homozygous mutant clones with identical biallelic indel sequences.
  • Unlike previous assays, RGEN-mediated RFLP is not restricted by sequence polymorphisms near nuclease target sites.

Conclusions:

  • CRISPR/Cas-derived RGENs offer a powerful and versatile tool for advancing RFLP analysis.
  • This method overcomes limitations of traditional RFLP and current genotyping assays for engineered nucleases.
  • RGEN-mediated RFLP provides improved accuracy and broader applicability for genetic mutation analysis.