One-Pot CRISPR-Cas12a-Based Viral DNA Detection via HRP-Enriched Extended ssDNA-Modified Au@Fe₃O₄ Nanoparticles

Area of Science:

• Molecular Biology
• Nanotechnology
• Biomedical Diagnostics

Background:

• Urgent need for early and accurate viral diagnosis during outbreaks and pandemics.
• Point-of-care testing (POCT) is crucial for rapid disease control and public health measures.
• Existing diagnostic methods may require complex equipment or lengthy procedures.

Purpose of the Study:

• To develop a sensitive and rapid viral DNA detection system for POCT.
• To utilize clustered regularly interspaced short palindromic repeats (CRISPR)-Cas12a technology for viral detection.
• To integrate multi-enzyme-modified magnetic nanoparticles for enhanced performance.

Main Methods:

• Developed a one-pot CRISPR-Cas12a system for viral DNA detection.
• Employed multi-enzyme-modified Au@Fe3O4 nanoparticles.
• Utilized single-stranded DNA elongation as an alternative to nucleic acid amplification.
• Incorporated magnetic nanoparticles for sample separation.

Main Results:

• Achieved a limit of detection of 0.25 nM, demonstrating high sensitivity.
• Method does not require sophisticated laboratory equipment.
• Magnetic nanoparticles facilitated efficient sample separation and streamlined the workflow.
• The system offers a simplified and expedited diagnostic process.

Conclusions:

• The developed CRISPR-Cas12a system provides a practical solution for sensitive viral DNA detection in POCT settings.
• This approach advances rapid and accurate diagnostics, particularly valuable during viral outbreaks.
• The integration of nanotechnology and CRISPR offers a promising platform for future diagnostic tools.