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Updated: Jun 16, 2026
High Throughput MicroRNA Profiling: Optimized Multiplex qRT-PCR at Nanoliter Scale on the Fluidigm Dynamic ArrayTM IFCs
Published on: August 3, 2011
Dual MicroRNA Simultaneous One-Step Profiling via Filler-Mediated Quantum Dot DNA Nanospheres for Bladder Cancer
Shunyu Gao1, Xin Zhao1, Pengjun Jiang1,2
1Department of Laboratory Medicine, Med+X Center for Manufacturing, Department of Urology, Department of Emergency Medicine, Clinical Laboratory Medicine Research Center, Sichuan Clinical Research Center for Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China.
This study introduces a rapid, dual-channel fluorescence platform for detecting urinary microRNAs (miRNAs) to diagnose bladder cancer. The novel quantum dot-DNA nanosphere assay offers high sensitivity and specificity for early detection and monitoring.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Molecular Diagnostics
Background:
- Urinary microRNAs (miRNAs) are vital biomarkers for noninvasive bladder cancer diagnosis and monitoring.
- Existing detection methods often lack the speed, sensitivity, or multiplexing capability required for clinical application.
Purpose of the Study:
- To develop a rapid, enzyme-free, and extraction-free dual-channel fluorescence platform for simultaneous detection of specific urinary miRNAs.
- To enable sensitive and selective detection of bladder cancer biomarkers using quantum dot-DNA nanospheres.
Main Methods:
- Construction of quantum dot-DNA nanospheres via streptavidin-biotin cross-linked hybridization chain reaction and compaction.
- Utilizing a strand-displacement cascade triggered by target miRNAs for fluorescence signal generation.
- Developing a dual-channel fluorescence readout at 500 nm and 624 nm for simultaneous miRNA detection.
Main Results:
- Achieved attomolar sensitivity with detection limits of 30 aM for miRNA-21 and 40 aM for miRNA-96.
- Demonstrated high selectivity against mismatched and non-target miRNAs.
- Clinical validation showed strong concordance with quantitative polymerase chain reaction, achieving 91.0% sensitivity and 80.0% specificity for bladder cancer detection.
Conclusions:
- The developed platform offers a rapid (40 min) and sensitive tool for noninvasive urinary miRNA profiling.
- Integrated dual-miRNA analysis significantly enhances diagnostic performance for bladder cancer.
- The platform shows potential for improved bladder cancer screening, stratification, and recurrence monitoring.
