Related Experiment Video
Updated: Aug 13, 2025
14:36
Combining QD-FRET and Microfluidics to Monitor DNA Nanocomplex Self-Assembly in Real-Time
Published on: August 26, 2009
11.2K
Multiplexed smFRET Nucleic Acid Sensing Using DNA Nanotweezers
Anisa Kaur1, Roaa Mahmoud1, Anoja Megalathan1
1Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23284, USA.
Biosensors
|January 21, 2023
Summary
A novel nanotweezer (NT) sensing strategy enables sensitive, quantitative multiplexed detection of disease biomarkers using a single fluorescence resonance energy transfer (FRET) pair. This approach simplifies analysis and shows promise for nucleic acid biomarker detection, including for triple-negative breast cancer (TNBC).
Area of Science:
- Biomarker Discovery
- Molecular Diagnostics
- Nanotechnology
Background:
- Multiplexed detection of disease biomarkers is crucial for improving diagnostic accuracy and efficiency.
- Existing methods like microarrays and electrochemical sensors have limitations in sensitivity, quantification, and design complexity.
- Fluorescence resonance energy transfer (FRET)-based single-molecule counting offers sensitive and quantitative detection but often requires complex setups.
Purpose of the Study:
- To develop a simplified nanotweezer (NT)-based sensing strategy for multiplexed biomarker detection.
- To utilize a single FRET pair for simultaneous detection of multiple targets, reducing complexity.
- To demonstrate the sensitivity and specificity of the NT sensor for nucleic acid biomarkers.
Main Methods:
- Development of a nanotweezer (NT) platform for molecular sensing.
- Implementation of a single fluorescence resonance energy transfer (FRET) pair for signal generation.
- Design of DNA mimics of microRNA (miRNA) biomarkers for triple-negative breast cancer (TNBC) detection.
- Hybridization-based assay for target recognition and signal transduction.
Main Results:
- Achieved sensitive detection of miRNA biomarkers down to the low picomolar range (≤10 pM).
- Demonstrated the ability to discriminate between targets with single-base mismatches, indicating high specificity.
- Successfully detected multiple targets using a single FRET pair and the NT platform, simplifying the multiplexing process.
Conclusions:
- The developed nanotweezer (NT)-based sensing strategy offers a simplified yet highly sensitive and quantitative approach for multiplexed biomarker detection.
- This method holds significant promise for the sensitive detection of various nucleic acid biomarkers, including those relevant to diseases like triple-negative breast cancer (TNBC).
- The straightforward hybridization-based mechanism facilitates broader applications in molecular diagnostics and personalized medicine.
