Simultaneous detection of multiple DNA targets based on encoding metal ions.

Area of Science:

• Electrochemistry
• Biotechnology
• Molecular Biology

Background:

• Simultaneous detection of multiple DNA targets is crucial for diagnostics.
• Existing methods may lack sensitivity or selectivity.
• Novel tagging strategies are needed for enhanced multiplexed DNA analysis.

Purpose of the Study:

• To develop a novel strategy for simultaneous electrochemical detection of multiple DNA targets.
• To utilize encoding metal ions bound to metallothionein (MT) for signal differentiation.
• To establish a sensitive and selective assay for virus DNA detection.

Main Methods:

• Synthesis of novel ssDNA/MT conjugates tagged with different metal ions (Zn2+, Cd2+, Pb2+).
• Electrochemical detection using differential anodic stripping voltammetry at a bismuth film electrode (BiFE).
• Hybridization-triggered release of metal ions for signal generation.

Main Results:

• Successful differentiation of three virus DNA targets using Zn2+, Cd2+, and Pb2+ tags.
• Linear relationship between anodic peak currents and DNA target concentrations (0.1 nM to 10 nM).
• Achieved a low detection limit of 33 pM with effective discrimination against one-base mismatched targets.

Conclusions:

• The developed method provides a sensitive and selective platform for multiplexed DNA detection.
• The use of metal ion-tagged ssDNA/MT conjugates offers a versatile approach for biosensing.
• This technique holds significant potential for broader applications in biological and immunoassay diagnostics.