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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
Published on: August 20, 2012
Production of a fluorescence resonance energy transfer (FRET) biosensor membrane for microRNA detection
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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