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Updated: Apr 1, 2026
MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR
Published on: May 16, 2012
A functionally differentiated DNA tetrahedron-based cascaded cyclic catalytic amplification assay for detecting
Tingting Guo1, Chang Zuo2, Ping Bai2
1Chongqing Traditional Chinese Medicine Hospital, Chongqing 400021, China.
Abstract:
A novel multi-functional DNA tetrahedron-based target-induced cascaded cyclic catalytic amplification (TICA) assay was developed for the sensitive detection of microRNA-21 (miR-21) in prostate cancer. This strategy ingeniously integrates two distinct DNA tetrahedron with specific functions (catalytic tetrahedron (Cat-DT) and signal DNA tetrahedron (Sig-DT)) to create a self-sustaining amplification circuit. The process is initiated when miR-21 triggers the release of a DNAzyme enzymatic strand (E-DNA), which converts Cat-DT into tri-branched DNA nanostructures (TB-DNA). Critically, each TB-DNA acts as a cascaded amplifier, bearing three E-DNA units that drive the exponential generation of more catalytic sites. Furthermore, the system employs an ingenious feedback loop: the TB-DNA/Sig-DT interaction produces a fluorescent signal while regenerating a miR-21-mimetic strand to perpetuate the catalytic cycle. This "target → catalyst → new target" paradigm enables ultra-efficient amplification, achieving a wide linear range from 600 fM to 100 nM and a low detection limit of 400 fM for miR-21. Notably, the TICA strategy significantly shortens the total reaction time to 80 min, demonstrating great potential for rapid and sensitive clinical diagnostics.
Insights
A new DNA tetrahedron assay (TICA) enables highly sensitive detection of microRNA-21 (miR-21) for prostate cancer diagnosis. This method uses a cyclic amplification strategy for rapid and accurate results.
Area of Science:
- Biotechnology
- Molecular Diagnostics
- Nanotechnology
Background:
- Prostate cancer diagnosis relies on accurate detection of biomarkers like microRNA-21 (miR-21).
- Existing detection methods may lack sensitivity, speed, or efficiency for clinical applications.
Purpose of the Study:
- To develop a novel, sensitive, and rapid assay for detecting miR-21 in prostate cancer.
- To establish a target-induced cascaded cyclic catalytic amplification (TICA) strategy using DNA nanostructures.
Main Methods:
- Integration of two functional DNA tetrahedrons: catalytic (Cat-DT) and signal (Sig-DT).
- Utilized a DNAzyme enzymatic strand (E-DNA) for converting Cat-DT into tri-branched DNA nanostructures (TB-DNA).
- Implemented a feedback loop involving TB-DNA/Sig-DT interaction for signal generation and miR-21-mimetic regeneration.
Main Results:
- Achieved a wide linear range for miR-21 detection from 600 fM to 100 nM.
- Established a low detection limit of 400 fM for miR-21.
- Reduced the total reaction time to 80 minutes.
Conclusions:
- The TICA assay demonstrates ultra-efficient amplification for sensitive miR-21 detection.
- This strategy holds significant potential for rapid and sensitive clinical diagnostics of prostate cancer.
