DNA Triangular Prism Based Tripedal Walking Along Triplex-Forming Track.

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Diagnostics

Background:

• MicroRNA (miRNA) biomarkers are crucial for disease diagnosis.
• Existing detection methods face challenges in sensitivity, stability, and cost.
• DNA nanomachines offer potential for precise molecular analysis.

Purpose of the Study:

• To develop a smart tripedal DNA walking nanomachine for highly sensitive miRNA detection.
• To leverage DNA nanostructure transitions for biomarker analysis.
• To create a reusable and cost-effective diagnostic platform.

Main Methods:

• Designing a DNA triangular prism nanomachine with integrated, suppressed DNAzyme activity.
• Utilizing target sequence-mediated catalytic hairpin assembly for structural transformation and DNAzyme activation.
• Employing a cleavable triplex-forming track on an electrode surface for signal generation.
• Demonstrating track regeneration via pH changes.

Main Results:

• The DNA nanomachine demonstrated satisfactory performance for highly sensitive miRNA biomarker analysis.
• TPDNA structural transformation activated the DNAzyme driver.
• Declined signal from track cleavage indicated miRNA levels.
• The system showed feasibility in complex biological samples and reusability.

Conclusions:

• The proposed strategy integrates DNA dynamic nanomachines and structural transitions for advanced nucleic acid studies.
• This approach holds significant potential for clinical diagnostics and biomarker discovery.
• The reusable and sensitive DNA nanomachine offers a cost-effective solution for miRNA detection.