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Highly sensitive MicroRNA 146a detection using a gold nanoparticle-based CTG repeat probing system and isothermal
1Department of Bioactive Material Sciences, Research Center of Bioactive Materials Chonbuk National University, Jeonju 561-756, South Korea.
Analytica Chimica Acta
|December 20, 2017
Summary
We developed a gold nanoparticle (AuNP)-based system for highly sensitive detection of microRNA 146a. This novel method combines AuNP probes with isothermal amplification for accurate miRNA quantification.
Area of Science:
- Nanotechnology
- Molecular Biology
- Biochemistry
Background:
- MicroRNA (miRNA) detection is crucial for disease diagnostics.
- Existing methods often lack sensitivity or selectivity.
- Gold nanoparticles (AuNPs) offer unique optical properties for biosensing.
Purpose of the Study:
- To develop a highly sensitive and selective detection system for miRNA 146a.
- To utilize a gold nanoparticle (AuNP)-based probe with a CTG repeat sequence.
- To combine the AuNP probe with isothermal amplification for enhanced signal generation.
Main Methods:
- A gold nanoparticle (AuNP)-based probe with a CTG repeat hairpin structure and a dTF fluorophore was designed.
- The probe exhibited high quenching due to the proximity of the AuNP and fluorophore.
- Isothermal amplification (rolling circle amplification) generated multiple CAG repeat sequences complementary to the probe.
- Binding of the probe to the amplified sequences induced a structural change, releasing fluorescence.
Main Results:
- The system achieved highly sensitive detection of miRNA 146a down to 14 aM.
- The method demonstrated high selectivity, distinguishing target miRNA 146a from single- and double-base mismatched sequences.
- The AuNP-based CTG repeat probe system showed efficient quenching and fluorescence amplification.
Conclusions:
- The developed AuNP-based CTG repeat probing system combined with isothermal amplification provides a sensitive and selective method for miRNA 146a detection.
- This approach offers a promising tool for miRNA-based diagnostics.
- The system's simplicity and high performance make it suitable for various biological applications.
