A signal conversion system using binding-induced strand displacement for disease biomarker assay

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Biology

Background:

• Biomarker detection is crucial for disease diagnosis.
• Existing biosensors face challenges in multiplexing and sensitivity.

Purpose of the Study:

• To design a universal, sensitive, and accurate biosensor for multiple biomarkers.
• To develop a DNAzyme-powered nanomachine using magnetic beads for signal conversion.

Main Methods:

• Utilized binding-induced DNA strand displacement (BINSD) principle.
• Employed magnetic beads for signal conversion and streptavidin-DNA (SA-DNA) for activation.
• Integrated complementary base pairing and affinity ligand recognition for signal transduction.

Main Results:

• Successfully constructed three signal conversion systems for multiplexed biomarker detection.
• Demonstrated universal, sensitive, accurate, and specific detection capabilities.
• Showcased strong anti-interference performance via magnetic separation.

Conclusions:

• The developed DNAzyme biosensor offers a robust platform for simultaneous detection of multiple biomarkers.
• The magnetic beads-based signal conversion strategy enhances biosensor performance and applicability.
• This approach holds significant potential for clinical diagnostics and personalized medicine.