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Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
Published on: June 1, 2011
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A laser-induced graphene-based electrochemical immunosensor for nucleic acid methylation detection
Jingyi Guo1, Mei Zhao1, Chen Chen1
1School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University, Wuhan, 430071, China. fwang@whu.edu.cn.
The Analyst
|November 21, 2023
Summary
This study presents a novel biosensor for detecting N6-methyladenosine (m6A-RNA) and 5-methylcytosine (5mC-ssDNA) in cells. The laser-induced graphene electrode offers sensitive and selective dual detection, paving the way for point-of-care diagnostics.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Molecular Biology
Background:
- DNA and RNA methylation are crucial epigenetic modifications implicated in various diseases.
- Accurate detection of methylated nucleic acids is vital for disease diagnosis and treatment.
- Laser-induced graphene (LIG) electrodes offer promising properties for biosensing applications.
Purpose of the Study:
- To develop a novel, sensitive, and selective biosensor for the simultaneous detection of N6-methyladenosine (m6A-RNA) and 5-methylcytosine (5mC-ssDNA).
- To address the challenge of detecting these key epigenetic markers within cellular samples.
- To explore the potential of a modified LIG electrode for point-of-care testing (POCT) applications.
Main Methods:
- Fabrication of a one-step laser-induced graphene (LIG) electrode.
- Stepwise modification of the LIG electrode with gold nanoparticles (AuNPs), sulfhydryl-modified nucleic acid chains, biotin-modified antibodies, and streptavidin-modified horseradish peroxidase (SA-HRP).
- Electrochemical detection using the hydrogen peroxide-hydroquinone (H2O2-HQ) system to quantify m6A-RNA and 5mC-ssDNA concentrations.
Main Results:
- The developed biosensor achieved low detection limits of 2.81 pM for m6A-RNA and 9.53 pM for 5mC-ssDNA.
- A wide linear detection range from 0.01 nM to 10 nM was established for both targets.
- The method demonstrated excellent selectivity, stability, and reproducibility, with low relative standard deviations (RSDs).
- Successful detection of m6A-RNA and 5mC-ssDNA in spiked HeLa cell samples was achieved.
Conclusions:
- The study successfully demonstrates a dual biosensor for m6A-RNA and 5mC-ssDNA detection based on a modified LIG electrode.
- The biosensor leverages gold-sulfur bonding and antigen-antibody interactions for enhanced conductivity and signal amplification.
- This approach shows significant potential for clinical applications and the advancement of POCT techniques for epigenetic biomarker analysis.
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