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Updated: Aug 13, 2026
High Throughput MicroRNA Profiling: Optimized Multiplex qRT-PCR at Nanoliter Scale on the Fluidigm Dynamic ArrayTM IFCs
Published on: August 3, 2011
Single-microbead space-confined digital quantification strategy (SMSDQ) for counting microRNAs at the single-molecule
Yuanwen Liang1, Desheng Chen1, Honghong Wang1
1Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing, 100083, China.
We developed a novel method for single-molecule quantification of microRNAs (miRNAs) using microbeads and gold nanoparticles. This digital approach offers ultrahigh sensitivity and specificity for miRNA detection in biological samples.
Area of Science:
- Biotechnology
- Nanotechnology
- Molecular Biology
Background:
- Accurate quantification of microRNAs (miRNAs) at the single-molecule level is crucial for clinical diagnostics and research.
- Current methods face limitations in transforming single-molecule events into reliable quantitative signals.
Purpose of the Study:
- To develop a novel digital quantification approach for single miRNA molecules.
- To overcome the limitations of existing single-molecule measurement techniques.
Main Methods:
- Introduced Single Microbead-based Space-confined Digital Quantification (SMSDQ).
- Utilized gold nanoparticles (AuNPs) and localized surface plasmon resonance (LSPR) light-scattering imaging.
- Employed a click reaction to link AuNPs to miRNA-hybridized microbeads for digital counting.
Main Results:
- Achieved single-molecule detection sensitivity and high specificity, including single-base discrimination.
- Demonstrated the ability to quantify miRNAs in limited biological samples (e.g., single-cell lysates, serum) without RNA isolation or amplification.
- Successfully applied the method to evaluate cell heterogeneity and subtle miRNA expression variations.
Conclusions:
- SMSDQ provides an ultrahigh sensitivity, specific, and digital method for miRNA quantification.
- The approach is suitable for analyzing cell heterogeneity and small variations in miRNA expression.
- Enables direct quantification of miRNAs in complex biological samples, advancing diagnostics and research.
