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Updated: Jun 12, 2026
09:06
MicroRNA Amplification and Recognition through Locked-nucleic-acid In situ Hybridization as a Novel Detection and Quantification Method
Published on: October 7, 2025
A framework nucleic acid -based cascade-amplified self-sustaining electrochemical ratiometric sensor for miRNA
Hexiang Li1, Yao Yao1, Ziyi Gao1
1College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China.
Talanta
|June 10, 2026
Summary
This study developed a stable electrochemical biosensor using framework nucleic acid (FNA) for sensitive miRNA-21 detection. The novel design enhances accuracy and reliability for bioanalysis and medical diagnostics.
Area of Science:
- Biotechnology
- Biosensors
- Nucleic Acid Chemistry
Background:
- Electrochemical sensors face stability and reliability challenges.
- Probe modification density and electrode degradation limit sensor performance.
- Existing DNA electrochemical ratiometric sensors can suffer from probe entanglement.
Purpose of the Study:
- To develop a highly stable and accurate electrochemical ratiometric biosensor.
- To detect miRNA-21 efficiently using novel framework nucleic acid (FNA) technology.
- To overcome limitations of traditional one-dimensional DNA sensors.
Main Methods:
- Constructed an electrochemical ratiometric biosensor using framework nucleic acid (FNA).
- Integrated cascade catalytic hairpin assembly (CHA) and hybridization chain reaction (HCR) for signal amplification.
- Utilized a bulge loop structure within the FNA for enhanced functional versatility.
Main Results:
- Achieved efficient and accurate detection of miRNA-21.
- Demonstrated superior stability and accuracy compared to conventional ratiometric sensors.
- Quantified miRNA-21 over a wide linear range (100 aM to 100 pM) with a low detection limit (45 aM).
Conclusions:
- The proposed FNA-based electrochemical ratiometric sensor offers enhanced stability, accuracy, and sensitivity.
- The sensor shows significant potential for bioanalysis and medical diagnostics.
- The rigid FNA structure prevents probe entanglement, improving sensor reliability.
