Production of a fluorescence resonance energy transfer (FRET) biosensor membrane for microRNA detection
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Updated: Dec 24, 2025
FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
Published on: August 20, 2012
Yike Fu1, Tong Chen, Gang Wang
1State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China. xiang.li@zju.edu.cn hgr@zju.edu.cn.
Abstract:
MicroRNAs (miRNAs) play a key role in regulating gene expression but can be associated with abnormalities linked to carcinogenesis and tumor progression. Hence there is increasing interest in developing methods to detect these non-coding RNA molecules in the human circulation system. Here, a novel FRET miRNA-195 targeting biosensor, based on silica nanofibers incorporated with rare earth-doped calcium fluoride particles (CaF2:Yb,Ho@SiO2) and gold nanoparticles (AuNPs), is reported. The formation of a sandwich structure, as a result of co-hybridization of the target miRNA which is captured by oligonucleotides conjugated at the surface of CaF2:Yb,Ho@SiO2 fibers and AuNPs, brings the nanofibers and AuNPs in close proximity and triggers the FRET effect. The intensity ratio of green to red emission, I541/I650, was found to decrease linearly upon increasing the concentration of the target miRNA and this can be utilized as a standard curve for quantitative determination of miRNA concentration. This assay offers a simple and convenient method for miRNA quantification, with the potential for rapid and early clinical diagnosis of diseases such as breast cancer.
Insights
A novel biosensor detects circulating microRNAs (miRNAs) using FRET. This method offers a simple way to quantify miRNAs for early disease diagnosis, like breast cancer.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Molecular Biology
Background:
- MicroRNAs (miRNAs) are crucial gene regulators implicated in cancer development.
- Detecting circulating miRNAs is vital for early disease diagnosis.
- Current detection methods require improvement in sensitivity and convenience.
Purpose of the Study:
- To develop a novel Förster Resonance Energy Transfer (FRET) biosensor for quantifying specific microRNAs.
- To utilize silica nanofibers and gold nanoparticles for enhanced miRNA detection.
- To establish a sensitive and convenient assay for circulating miRNA analysis.
Main Methods:
- Fabrication of a biosensor using rare earth-doped calcium fluoride (CaF2:Yb,Ho@SiO2) nanofibers and gold nanoparticles (AuNPs).
- Design of a sandwich structure for miRNA capture via oligonucleotide conjugation.
- Monitoring FRET signal changes (I541/I650 ratio) for miRNA quantification.
Main Results:
- The FRET biosensor successfully detected target miRNA-195.
- A linear decrease in the emission intensity ratio (I541/I650) correlated with increasing miRNA concentration.
- The assay demonstrated a simple, convenient, and quantitative method for miRNA detection.
Conclusions:
- The developed FRET biosensor provides a sensitive platform for circulating miRNA quantification.
- This technology holds potential for rapid and early clinical diagnosis of cancers, including breast cancer.
- The nanostructure-based FRET approach offers a promising tool in molecular diagnostics.
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