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Fluorescent silver nanocluster DNA probes for multiplexed detection using microfluidic capillary electrophoresis
Jackson Travis Del Bonis-O'Donnell1, Deborah K Fygenson, Sumita Pennathur
1Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, CA, USA. jtdo@engineering.ucsb.edu.
The Analyst
|January 21, 2015
Summary
This study introduces novel DNA-stabilized fluorescent silver nanoclusters (AgNC DNA) for multiplexed DNA detection. These probes enable rapid, single-step identification of Hepatitis A, B, and C DNA targets using microfluidic capillary electrophoresis.
Area of Science:
- Biochemistry
- Nanotechnology
- Molecular Diagnostics
Background:
- DNA-stabilized fluorescent silver nanoclusters (AgNC DNA) are emerging fluorophores formed by silver and single-stranded DNA interactions.
- AgNC DNA probes integrate target-binding and fluorescent reporting, eliminating the need for external dyes or quenchers.
Purpose of the Study:
- To modify AgNC DNA probes for single-color multiplexed DNA target detection.
- To demonstrate the utility of poly-dT sequence length for tuning electrophoretic mobility without altering fluorescence spectra.
Main Methods:
- Development of AgNC DNA probes with sequence-specific binding to Hepatitis A, B, and C DNA targets.
- Tuning probe electrophoretic mobility by appending varying lengths of poly-dT sequences.
- Utilizing microfluidic capillary electrophoresis for rapid (<10 seconds) separation and detection.
Main Results:
- Successful single-color multiplexed detection of three distinct DNA targets in a single step.
- Electrophoretic mobility successfully tuned by poly-dT length, enabling probe differentiation.
- Achieved high resolution (3.47) and signal-to-noise ratio (17.23) for target identification.
Conclusions:
- AgNC DNA probes offer a versatile platform for multiplexed nucleic acid detection.
- The developed method provides a rapid, sensitive, and simple approach for identifying specific viral DNA sequences.
- This technology holds promise for streamlined molecular diagnostics.
