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Electrochemiluminescent/voltammetric toxicity screening sensor using enzyme-generated DNA damage.

Minjeong So¹, Eli G Hvastkovs, John B Schenkman

¹Department of Chemistry, University of Connecticut, Storrs, CT 06269-3060, United States.

Biosensors & Bioelectronics

|September 11, 2007

Summary

This study introduces a novel sensor for detecting genotoxicity using DNA and enzymes. It simultaneously measures DNA damage via electrochemiluminescence and voltammetry, enabling rapid toxicity screening.

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Area of Science:

Biomedical Engineering
Analytical Chemistry
Environmental Science

Background:

Genotoxicity assessment is crucial for evaluating chemical safety and environmental impact.
Existing methods for detecting genotoxicity often require complex procedures and are time-consuming.
Mimicking in vivo metabolic activation and DNA damage is essential for accurate toxicity screening.

Purpose of the Study:

To develop a novel biosensor for simultaneous optical and voltammetric detection of bioactivated genotoxicity.
To utilize ultrathin films of DNA, model metabolic enzymes, and an electrochemiluminescence (ECL) metallopolymer for sensor construction.
To establish a rapid and sensitive method for assessing DNA damage relevant to toxicity screening.

Main Methods:

Fabrication of pyrolytic graphite electrodes with ultrathin films of DNA, cytochrome P450cam/myoglobin, and [Ru(bpy)2PVP10]2+ metallopolymer.

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Monitoring sensor film growth and component amounts using quartz crystal microbalance (QCM).

Simultaneous measurement of DNA damage using electrochemiluminescence (ECL) and square wave voltammetry (SWV) after enzymatic conversion of styrene to styrene oxide.

Main Results:

The model enzyme reaction successfully converted styrene to styrene oxide, which subsequently damaged DNA nucleobases within the sensor film.
Both ECL and SWV signals increased with enzyme reaction time, indicating genotoxicity.
The sensor demonstrated high sensitivity, detecting approximately 3 damaged DNA bases per 10,000 within 1 minute, suitable for toxicity screening.

Conclusions:

A novel biosensor platform enables simultaneous optical and voltammetric detection of bioactivated genotoxicity.
The developed sensor provides a rapid and sensitive method for assessing enzyme-mediated DNA damage.
This approach offers a promising tool for toxicity screening applications and environmental monitoring.