CRISPR/Cas9 On- and Off-Target Activity Using Correlative Force and Fluorescence Single-Molecule Microscopy

Area of Science:

• Molecular Biology
• Biotechnology
• Genetic Engineering

Background:

• CRISPR/Cas9 is a programmable endonuclease enabling genetic manipulation.
• Potential for novel gene therapies to treat genetic diseases.
• Off-target editing by CRISPR/Cas9 presents a significant safety concern for therapeutic applications.

Purpose of the Study:

• To investigate factors influencing Cas9 specificity.
• To develop methods for analyzing on- and off-target Cas9 activity.
• To enhance the safety and efficiency of CRISPR/Cas9-based therapeutics.

Main Methods:

• Utilized optical tweezers for precise manipulation.
• Employed confocal fluorescence microscopy for visualization.
• Integrated microfluidics for controlled experimental conditions.
• Analyzed both on-target and off-target Cas9 activity.

Main Results:

• Established a novel methodology for assessing Cas9 specificity.
• Provided insights into the biophysical parameters governing Cas9 binding and cleavage.
• Quantified on- and off-target editing events with high resolution.

Conclusions:

• The developed methods are crucial for understanding and improving Cas9 specificity.
• This research contributes to the development of safer and more effective gene therapies.
• Further investigation into Cas9 specificity is vital for clinical translation.