Electrochemical Biosensor for Multiplexed Detection of Nucleic Acids Using a DNA Three-Way Junction with Metal Ion...

Area of Science:

• Biomedical Engineering
• Molecular Diagnostics
• Electrochemistry

Background:

• Multiplexed biosensing improves early disease diagnosis accuracy.
• Electrochemical techniques are suitable for multiplexed target detection.
• DNA three-way junctions (3WJ) offer enhanced stability for multiplexed nucleic acid detection compared to double-stranded DNA.

Purpose of the Study:

• To propose an electrochemical biosensor based on 3WJ-metal ion intercalated DNA (3WJ-MID) for simultaneous detection of multiple DNA targets.
• To utilize an electrode with Au nanopatterns to amplify the electrochemical response.
• To validate the biosensor's multiplexed detection capability using human papillomavirus types 16 and 18 DNA targets.

Main Methods:

• Development of a 3WJ-MID based electrochemical biosensor.
• Integration of an electrode with Au nanopatterns for signal amplification.
• Detection of specific DNA sequences (HPV 16 and 18) using the developed biosensor.

Main Results:

• Demonstration of simultaneous detection of multiple DNA targets using the 3WJ-MID biosensor.
• Enhanced electrochemical response achieved through the use of Au nanopatterned electrodes.
• Successful validation of multiplexed detection for human papillomavirus (HPV) 16 and 18 DNA.

Conclusions:

• The proposed 3WJ-MID electrochemical biosensor enables accurate multiplexed detection of DNA biomarkers.
• The use of Au nanopatterned electrodes significantly amplifies the electrochemical signal.
• This biosensor holds potential for the multiplexed detection of various nucleic acid biomarkers, including viral DNA for improved diagnostics.