opvCRISPR: One-pot visual RT-LAMP-CRISPR platform for SARS-cov-2 detection

Area of Science:

• Molecular Biology
• Virology
• Biotechnology

Background:

• The COVID-19 pandemic necessitates rapid, sensitive, and user-friendly SARS-CoV-2 detection methods.
• Existing diagnostic tools require optimization for point-of-care applications and early intervention.

Purpose of the Study:

• To develop a novel, integrated system for visual detection of SARS-CoV-2.
• To enhance sensitivity and speed for molecular diagnostics of COVID-19.

Main Methods:

• Integration of reverse transcription loop-mediated isothermal amplification (RT-LAMP) and Cas12a cleavage in a one-pot system (opvCRISPR).
• Utilizing Cas12a's collateral activity on single-stranded DNA (ssDNA) reporters for visual signal generation.
• Validation using 50 potentially infected clinical samples and comparison with CDC-approved quantitative RT-PCR.

Main Results:

• The opvCRISPR system achieved nearly single-molecule detection sensitivity within 45 minutes.
• Visual detection of SARS-CoV-2 was enabled by the amplified RT-LAMP product triggering Cas12a activity.
• opvCRISPR demonstrated 100% agreement with quantitative RT-PCR results.

Conclusions:

• opvCRISPR offers a rapid, sensitive, and visual method for SARS-CoV-2 detection.
• The system shows significant potential for next-generation point-of-care molecular diagnostics.
• This approach facilitates early intervention and control of SARS-CoV-2 spread.