Integrated Micropillar Polydimethylsiloxane Accurate CRISPR Detection System for Viral DNA Sensing

Area of Science:

• Biotechnology
• Molecular Diagnostics
• CRISPR Technology

Background:

• CRISPR-Cas12a systems offer precise nucleic acid detection.
• Current diagnostic methods often require complex sample preparation and off-chip steps.
• Developing sensitive, rapid, and point-of-care diagnostic tools is crucial for emerging pathogens.

Purpose of the Study:

• To develop a fully integrated microfluidic system for sensitive and accurate viral DNA detection.
• To leverage CRISPR-Cas12a collateral activity for a simplified and rapid diagnostic assay.
• To create a point-of-care diagnostic platform for pathogen surveillance.

Main Methods:

• Fabrication of a polydimethylsiloxane microfluidic chip with high-aspect-ratio micropillars.
• Surface modification and immobilization of single-stranded DNA reporters on micropillars.
• Integration of CRISPR-Cas12a/crRNA complex for on-chip, isothermal DNA detection.
• Quantification of released fluorescence reporters proportional to target DNA concentration.

Main Results:

• The Integrated Micropillar Polydimethylsiloxane Accurate CRISPR deTection (IMPACT) system achieved sensitive DNA detection from 0.1 to 10 nM.
• The system demonstrated reduced background fluorescence by eliminating dye-quencher probes.
• One-step, on-chip detection was completed within 120 minutes at isothermal conditions (37 °C).
• The assay showed linear proportionality between fluorescence intensity and target DNA concentration.

Conclusions:

• The IMPACT system provides a sensitive, accurate, and rapid method for viral DNA detection.
• This integrated microfluidic platform simplifies the diagnostic workflow, suitable for point-of-care applications.
• The developed technology holds promise for next-generation diagnostics against infectious disease outbreaks.