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Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules

Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules

Published on: June 1, 2011

Single-nucleotide polymorphism genotyping using a novel multiplexed electrochemical biosensor with nonfouling

Gang Liu¹, Ruojun Lao, Li Xu

¹Division of Chemistry and Ionizing Radiation Measurement Technology, Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, PR China.

Biosensors & Bioelectronics

|December 19, 2012

Summary

A new electrochemical DNA biosensor accurately detects single-nucleotide polymorphisms (SNPs) using specific DNA ligation. This high-throughput biosensor distinguishes single-mismatched mutant genes, showing great potential for genetic analysis.

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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

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Published on: September 10, 2014

Area of Science:

Electrochemistry
Molecular Biology
Genetics

Background:

Single-nucleotide polymorphisms (SNPs) are crucial genetic markers.
Accurate SNP detection is vital for disease diagnosis and genetic research.
Existing methods can be limited by specificity, throughput, or complexity.

Purpose of the Study:

To develop a novel electrochemical DNA biosensor for high-throughput SNP analysis.
To create a nonfouling surface to improve biosensor specificity.
To demonstrate the biosensor's capability in detecting clinically relevant genetic mutations.

Main Methods:

Constructed an oligonucleotide-incorporated nonfouling surface (ONS) on a 16-electrode array.
Utilized specific oligonucleotide ligation for target DNA recognition.
Employed avidin-horseradish peroxidase for signal amplification and amperometric detection.

Main Results:

The biosensor demonstrated high specificity, distinguishing single-mismatched mutant genes.
A 10% single-mismatched mutant gene yielded a current signal 16 times higher than the blank.
Successfully analyzed real-world samples including hepatitis B virus (HBV) and human CYP2C19 genetic variations.

Conclusions:

The developed multiplexed electrochemical DNA biosensor offers a selective and practical approach for SNP analysis.
The nonfouling surface and specific ligation strategy enhance detection capabilities.
This technology holds promise for high-throughput genetic screening and diagnostics.