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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

An enzyme-responsive electrochemical DNA biosensor achieving various dynamic range by using only-one immobilization

Jianru Wang¹, Xue Chen¹, Dengfeng Qu²

¹College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China.

Analytica Chimica Acta

|March 16, 2023

Summary

This study presents a novel enzyme-responsive electrochemical DNA biosensor. The innovative design offers tunable dynamic range, improved detection limits, and enhanced discrimination for diagnostics.

Keywords:

DNA biosensor Dynamic range Electrochemistry Enzyme cleavage

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Area of Science:

Biotechnology
Biosensor Technology
Molecular Diagnostics

Background:

Developing biosensors with tunable dynamic range is crucial for advancing diagnostic applications.
Existing biosensors often face limitations in sensitivity, dynamic range, and ease of operation.
Enzyme-responsive mechanisms offer potential for enhanced biosensor performance.

Purpose of the Study:

To develop a simple, easy-to-operate electrochemical DNA biosensor with a tunable dynamic range.
To utilize an enzyme (EcoRI restriction endonuclease) for modulating biosensor detection performance.
To create a biosensor with improved diagnostic capabilities and potential for drug monitoring.

Main Methods:

Design of a single immobilization probe with a two-loop hairpin structure.
Incorporation of independent target recognition and enzyme-responsive domains within the probe.
Utilizing toehold-mediated strand displacement and enzyme cleavage for signal amplification and modulation.
Testing the biosensor in various buffer conditions and a serum system.

Main Results:

The enzyme cleavage significantly improved target recognition by liberating the toehold region.
Demonstrated a largely extended dynamic range and significantly lowered detection limit.
Showcased superior discrimination ability against mismatched sequences.
Validated performance in different salt concentrations and a complex biological matrix (serum).

Conclusions:

The developed enzyme-responsive DNA biosensor offers tunable detection performance through enzyme cleavage.
The biosensor exhibits simplicity in probe design, fabrication, and operation.
This approach opens new avenues for modulated DNA biosensors with high potential in diagnostics and drug monitoring.