Measuring double-strand break repair events in mammalian cells with multi-target CRISPR

Area of Science:

• Genetics and Genomics
• Molecular Biology
• Biotechnology

Background:

• Understanding DNA double-strand break (DSB) repair pathways is crucial but challenging.
• CRISPR-Cas9 enables targeted DSB induction for studying repair, but current methods are low-throughput or use non-endogenous reporter systems.
• Existing CRISPR-Cas9 techniques face limitations in scalability and accurately reflecting in vivo repair phenotypes.

Purpose of the Study:

• To develop a high-throughput method for inducing DSBs at multiple endogenous genomic sites.
• To overcome the throughput and reporter system limitations of conventional CRISPR-Cas9 studies.
• To facilitate comprehensive analysis of DNA repair mechanisms at multiple locations simultaneously.

Main Methods:

• Development of multi-target CRISPR, a Cas9-based tool leveraging repetitive genomic regions.
• Controlled, high-throughput induction of DSBs at endogenous sites.
• Design and execution of multi-target CRISPR experiments, including next-generation sequencing data analysis for DSB repair characterization.

Main Results:

• Successful implementation of multi-target CRISPR for inducing DSBs at multiple endogenous genomic loci.
• Enabling high-throughput analysis of DNA double-strand break repair events.
• Development of a robust protocol for experimental design and data analysis.

Conclusions:

• Multi-target CRISPR significantly enhances the capacity to study mammalian DSB repair mechanisms.
• This tool provides a more physiologically relevant approach compared to traditional reporter systems.
• Multi-target CRISPR is poised to become a valuable asset for high-throughput investigation of DNA repair.