Related Experiment Video

Updated: Jan 1, 2026

A Standard Methodology to Examine On-site Mutagenicity As a Function of Point Mutation Repair Catalyzed by CRISPR/Cas9 and SsODN in Human Cells
10:07

A Standard Methodology to Examine On-site Mutagenicity As a Function of Point Mutation Repair Catalyzed by CRISPR/Cas9 and SsODN in Human Cells

Published on: August 25, 2017

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Specificity Assessment of CRISPR Genome Editing of Oncogenic EGFR Point Mutation with Single-Base Differences

Taegeun Bae1, Hanseop Kim2, Jeong Hee Kim3

  • 1Department of Medicine, Graduate School, Kyung Hee University, Seoul 02447, Korea.

Molecules (Basel, Switzerland)
|December 28, 2019
PubMed

Insights

A novel CRISPR genome editing method enhances specificity by targeting the protospacer adjacent motif (PAM) sequence. This PAM-based approach improves precision for gene therapy, particularly for single-base mutations like those in EGFR.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • CRISPR genome editing uses guide RNAs and CRISPR proteins for targeted DNA cleavage.
  • CRISPR technology holds promise for gene therapy but faces challenges with off-target mutations due to sequence complementarity.
  • Off-target effects are a significant safety concern, especially for precise correction of point mutations.

Purpose of the Study:

  • To evaluate a novel CRISPR genome editing technique designed for enhanced specificity.
  • To assess the efficacy of a PAM-based mismatch positioning strategy compared to conventional methods.
  • To investigate the potential of this technique for precise therapeutic gene editing.

Main Methods:

  • Comparison of PAM-based and conventional CRISPR genome editing specificities.
  • Targeting an oncogenic single-base mutation in the endothelial growth factor receptor (EGFR) gene.
  • Assessment of genome editing precision at the single-base level.

Main Results:

  • The PAM-based CRISPR method demonstrated significantly increased genome editing specificity.
  • This novel technique precisely targeted pathogenic mutant alleles with single-base accuracy.
  • Reduced off-target edits were observed compared to conventional CRISPR methods.

Conclusions:

  • The PAM-based CRISPR genome editing technique offers a significant improvement in specificity.
  • This method shows potential for safer and more precise gene therapy applications.
  • Targeting mismatches within the PAM sequence is a viable strategy for enhancing CRISPR editing accuracy.
Keywords:
CRISPRPAMoff-targetsingle-base precisionspecificity

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