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Sensitive and label-free biosensing of RNA with predicted secondary structures by a triplex affinity capture method
Laura G Carrascosa1, S Gómez-Montes, A Aviñó
1Nanobiosensors and Bioanalytical Applications Group, CIBER-BBN and Research Center on Nanoscience and Nanotechnology (CIN2) CSIC, Barcelona, Spain. lcarrascosa@cin2.es
Nucleic Acids Research
|January 14, 2012
Summary
A new biosensor uses DNA tail-clamps for label-free detection of RNA and DNA. This method efficiently detects nucleic acid sequences, especially those with complex structures, at femtomol levels.
Area of Science:
- Biotechnology
- Molecular Biology
- Biosensing
Background:
- Detecting nucleic acid sequences, particularly RNA with secondary structures, presents challenges for conventional methods.
- Existing biosensing techniques often require labels or amplification, adding complexity and cost.
Purpose of the Study:
- To develop a novel, label-free biosensing approach for detecting nucleic acid sequences of varying lengths.
- To specifically target and efficiently detect RNA molecules with secondary structures.
- To enhance detection sensitivity and speed compared to traditional methods.
Main Methods:
- Implementation of a surface plasmon resonance (SPR) biosensor.
- Utilization of 8-aminoadenine-modified parallel-stranded DNA tail-clamps as affinity bioreceptors.
- Formation of a stable triplex-stranded helix upon hybridization with nucleic acid targets at neutral pH.
Main Results:
- Successful label-free detection of short DNA (32-mer) and purified RNA (103-mer) at femtomol levels within minutes.
- Achieved a limit of detection of 50 fmol for RNA with secondary structures, without labels or amplification.
- Demonstrated significant detection enhancement: 18% for DNA and 54% for RNA compared to conventional duplex approaches.
Conclusions:
- The developed DNA tail-clamp strategy offers a sensitive, rapid, and label-free method for nucleic acid detection.
- This approach shows particular promise for the detection of RNA molecules with complex secondary structures.
- The methodology provides a significant improvement over conventional duplex methods, especially for challenging targets.
