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MicroRNA Amplification and Recognition through Locked-nucleic-acid In situ Hybridization as a Novel Detection and Quantification Method
Published on: October 7, 2025
478
Label-free detection of microRNA based on coupling multiple isothermal amplification techniques
Xiangjiang Zheng1,2, Li Niu2, Di Wei2
1Key Laboratory of Sensor Analysis of Tumor Marker, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
Scientific Reports
|October 26, 2016
Summary
We developed a sensitive, label-free method for detecting let-7d microRNA (miRNA) using combined DNA amplification techniques. This approach achieves a low detection limit, showing promise for biomarker analysis in real samples.
Area of Science:
- Biochemistry
- Molecular Biology
- Analytical Chemistry
Background:
- MicroRNAs (miRNAs) are crucial biomarkers in cancer diagnostics.
- Sensitive and specific detection methods for miRNAs are essential for early disease detection.
- Existing methods may lack sensitivity or require complex labeling.
Purpose of the Study:
- To develop a novel, label-free assay for sensitive quantification of let-7d miRNA.
- To utilize multiple amplification strategies for enhanced signal generation.
- To validate the method's performance in complex biological matrices like serum.
Main Methods:
- A label-free detection strategy employing sequential strand displacement amplification (SDA) and rolling circle amplification (RCA).
- Utilized a stem-loop DNA template and a circular template for signal amplification.
- Detection of amplified products via fluorescence using N-methyl mesoporphyrin IX (NMM) and a fluorimeter.
Main Results:
- Achieved a highly sensitive detection limit of 1.5 × 10-13 M for let-7d miRNA.
- Demonstrated excellent selectivity, distinguishing target miRNA from other nucleic acids.
- Successfully applied the method for let-7d miRNA determination in human serum samples.
Conclusions:
- The developed multi-amplification method offers a sensitive and label-free approach for miRNA detection.
- This technique shows significant potential for clinical applications in cancer biomarker analysis.
- The methodology provides a robust platform for quantifying specific miRNAs in biological fluids.
