Double-Stranded Ligation Assay for the Rapid Multiplex Quantification of MicroRNAs

Area of Science:

• Biomarker Discovery
• Point-of-Care Diagnostics
• Electrochemical Biosensing

Background:

• MicroRNAs are key biomarkers for early disease detection, including cancer and acute coronary syndrome.
• Current detection methods lack the speed, sensitivity, and specificity required for bedside medical applications.
• Microchip-based systems offer robust signal measurement for biochemical interfaces.

Purpose of the Study:

• To develop a fast, sensitive, and specific point-of-care assay for multiplex microRNA quantification.
• To utilize a CMOS chip with interdigitated gold electrodes for electrochemical detection.
• To enable reliable microRNA biomarker analysis in body fluids for early disease diagnosis.

Main Methods:

• Developed an electrochemical assay for multiplex microRNA quantification on a CMOS chip.
• Employed interdigitated gold electrode sensor positions for signal detection.
• Utilized a tripartite hybridization complex formation with subsequent ligation to capture and reporter strands.

Main Results:

• Achieved a time to results of 30 minutes for microRNA detection.
• Demonstrated a limit of detection below 1 pM, with specificity down to single mismatch discrimination.
• Showcased excellent signal dynamics between 1 pM and 1 nM for reliable quantification.

Conclusions:

• The developed assay is suitable for fast, sensitive, and specific microRNA detection at the point-of-care.
• The assay's simple workflow facilitates implementation into automated diagnostic devices.
• This technology promises to advance early disease diagnosis through microRNA biomarker analysis.