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A Droplet-Based Microfluidic Approach and Microsphere-PCR Amplification for Single-Stranded DNA Amplicons
Published on: November 14, 2018
A valveless microfluidic device for integrated solid phase extraction and polymerase chain reaction for short tandem
Kristin A Hagan1, Carmen R Reedy, Joan M Bienvenue
1Department of Chemistry, University of Virginia, McCormick Road, P.O. Box 400319, Charlottesville, VA 22904, USA.
The Analyst
|March 23, 2011
Summary
A novel microdevice integrates solid phase extraction (SPE) and polymerase chain reaction (PCR) for rapid DNA analysis. This chip-based system efficiently analyzes short tandem repeat (STR) profiles from biological samples, reducing time and reagent use.
Area of Science:
- Biotechnology
- Forensic Science
- Microfluidics
Background:
- Conventional short tandem repeat (STR) analysis for forensic applications involves multiple complex steps.
- Integrating sample preparation and amplification on a single platform can streamline DNA analysis.
Purpose of the Study:
- To develop and evaluate an integrated microdevice for simultaneous solid phase extraction (SPE) and polymerase chain reaction (PCR) of DNA.
- To assess the efficiency of the integrated system for short tandem repeat (STR) profiling.
Main Methods:
- A valveless microdevice with distinct SPE (silica beads) and PCR (~500 nL chamber) domains was fabricated.
- DNA from buccal swabs was purified via syringe-driven SPE and amplified using an in-house infrared (IR)-mediated PCR system.
- A 16-loci Identifiler® multiplex assay was performed on the integrated chip.
Main Results:
- The integrated SPE-PCR microdevice successfully generated a full 16-loci STR profile from buccal swab DNA.
- The system achieved an ~80-fold reduction in sample volume and a 2.2-fold reduction in reagent volume.
- Overall analysis time was reduced by approximately 5-fold compared to conventional methods.
Conclusions:
- The developed SPE-PCR microdevice offers a significant advancement for rapid genetic analysis.
- This technology has potential for various genetic analysis applications, including forensic science.
- Future integration with microchip electrophoresis (ME) could enable complete on-chip forensic STR analysis.
