Hydrogen Peroxide-triggered Chemical Strategy for Controlling CRISPR systems

Area of Science:

• Molecular Biology
• Biochemistry
• Gene Editing Technologies

Background:

• The CRISPR system offers precise gene editing capabilities but lacks conditional control mechanisms.
• Guide RNA (gRNA) is crucial for CRISPR targeting, and its structure can be engineered for functional control.
• Developing methods for inducible CRISPR activation is essential for safe and effective in vivo applications.

Purpose of the Study:

• To engineer a chemically controllable CRISPR system using modified guide RNA (gRNA).
• To enable conditional RNA-guided nucleic acid cleavage activated by endogenous hydrogen peroxide.
• To expand the toolkit for precise gene editing in living cells and therapeutic applications.

Main Methods:

• Introduction of a protective group at the 2'-OH position of RNA to inhibit cleavage.
• Chemical stimulation using hydrogen peroxide to restore gRNA function and enable target cleavage.
• Analysis of the mechanism involving reduced base-pairing and altered RNA-protein interactions.

Main Results:

• Successfully developed a modified gRNA that is inactive until exposed to hydrogen peroxide.
• Demonstrated restoration of RNA-guided nucleic acid cleavage upon chemical stimulation.
• Identified that chemical modification impacts RNA-target complementarity and RNA-protein interactions.

Conclusions:

• A novel strategy for conditional CRISPR control via chemically modified gRNA has been established.
• This method utilizes endogenous hydrogen peroxide for inducible gene editing activation.
• The approach holds significant potential for advanced gene editing in cellular environments and disease treatment.