Mini crRNA-Mediated CRISPR/Cas12a System Enhanced Imaging of Multiple MicroRNAs in Cells

Area of Science:

• Molecular Biology
• Biotechnology
• Cellular Imaging

Background:

• RNA imaging is vital for understanding gene expression and regulation in cells.
• CRISPR/Cas12a systems offer precise molecular targeting capabilities.
• Existing methods for microRNA (miRNA) imaging have limitations in sensitivity and specificity.

Purpose of the Study:

• To develop an enhanced imaging system for sensitive and specific detection of multiple microRNAs (miRNAs) in live cells.
• To apply a mini CRISPR/Cas12a (MCM-CRISPR/Cas12a) system with a molecular beacon (MB) for miRNA visualization.
• To investigate the dynamics and distribution of miRNAs within cellular environments.

Main Methods:

• Designed a novel MCM-CRISPR/Cas12a system utilizing a molecular beacon (MB) as the activator.
• The MB forms a DNA/RNA hybrid with target miRNAs, triggering fluorescence and Cas12a activity.
• Engineered the system for specific detection of miRNA-21, miRNA-155, and miRNA-10b.

Main Results:

• The MCM-CRISPR/Cas12a system demonstrated sensitive and specific imaging of targeted miRNAs both intracellularly and extracellularly.
• The system achieved enhanced fluorescence intensity through Cas12a-mediated trans-cleavage.
• Successful application for imaging multiple specific miRNAs, including miRNA-21, miRNA-155, and miRNA-10b.

Conclusions:

• The developed MCM-CRISPR/Cas12a system provides a novel approach for sensitive and specific multi-miRNA imaging in cells.
• This technology is valuable for studying miRNA localization, dynamics, and regulation in basic biology and clinical research.
• The system offers potential for advancing diagnostics and therapeutic strategies involving miRNAs.