Small molecules enhance CRISPR genome editing in pluripotent stem cells

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• CRISPR-Cas9 is effective for gene knockout via non-homologous end joining (NHEJ) but inefficient for precise genome editing.
• Homology-directed repair (HDR) enables precise editing but requires efficient modulation.
• Developing methods to enhance precise genome engineering is crucial for research and therapeutic applications.

Purpose of the Study:

• To develop a high-throughput screening method for identifying chemical compounds that modulate precise genome editing via HDR.
• To discover small molecules that enhance CRISPR-mediated HDR efficiency.
• To investigate the effects of small molecules on both HDR and NHEJ pathways.

Main Methods:

• Developed a reporter-based screening assay for identifying compounds affecting genome editing.
• Screened chemical libraries to find modulators of CRISPR-Cas9 activity.
• Validated the efficacy of identified small molecules in various cell types.
• Assessed the impact of compounds on both HDR and NHEJ-mediated mutations.

Main Results:

• Identified small molecules that enhance CRISPR-mediated HDR efficiency by 3-fold for large fragment insertions and 9-fold for point mutations.
• Discovered a small molecule that inhibits HDR but enhances NHEJ-mediated frameshift insertion and deletion (indel) mutations.
• Demonstrated that the identified small molecules function robustly in diverse cell types with minimal toxicity.

Conclusions:

• Small molecules can effectively enhance precise genome engineering applications mediated by CRISPR-Cas9.
• This strategy simplifies and improves the efficiency of precise gene editing.
• The identified compounds facilitate the study of DNA repair mechanisms in mammalian cells.
• This approach holds promise for advancing gene therapy and genetic research.