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Visual Detection of Multiple Nucleic Acids in a Capillary Array
Published on: November 15, 2017
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Digital microfluidics with distance-based detection - a new approach for nucleic acid diagnostics.
Man Ho1,2, N Sathishkumar1,2, Alexandros A Sklavounos1,2
1Department of Chemistry, University of Toronto, 80. St. George Street, Toronto, Ontario, M5S 3H6, Canada. aaron.wheeler@utoronto.ca.
Lab on a Chip
|November 21, 2023
Summary
This study introduces a novel microfluidic system integrating digital microfluidics and distance-based detection for point-of-care nucleic acid amplification tests. This automated approach eliminates the need for external detection equipment, enabling direct signal readout for enhanced diagnostic capabilities.
Area of Science:
- Biotechnology
- Microfluidics
- Molecular Diagnostics
Background:
- Loop-mediated isothermal amplification (LAMP) is a promising alternative to PCR for point-of-care nucleic acid amplification tests (POC NAATs).
- Current LAMP-based POC NAATs often require dedicated optical detection apparatus and manual sample processing, limiting their portability and ease of use.
- Existing systems face challenges with background noise and isolating target amplification products.
Purpose of the Study:
- To develop a novel microfluidic system for automated LAMP-based POC NAATs.
- To integrate digital microfluidics (DMF) with distance-based detection (DBD) for direct signal readout, eliminating the need for external detection equipment.
- To optimize reagent, material, and process combinations for reliable DMF-DBD operation in POC NAATs.
Main Methods:
- Development of a microfluidic system combining digital microfluidics (DMF) with distance-based detection (DBD).
- Characterization of reagents, materials, and processes for optimal DMF-DBD performance.
- Implementation of a Capto™ adhere bead-based clean-up procedure to remove background noise from low molecular weight LAMP products.
- Validation of the system for SARS-CoV-2 detection in saliva samples.
Main Results:
- The novel DMF-DBD system successfully integrated LAMP for POC NAATs without requiring external detection apparatus.
- A bead-based clean-up procedure effectively reduced background signals, enabling sensitive detection of high-molecular-weight LAMP products.
- The system accurately distinguished between different viral loads (no virus, 10^4 copies/mL, 10^8 copies/mL) in saliva samples.
- Automated sample processing and direct signal readout were achieved.
Conclusions:
- The combination of DMF and DBD presents a powerful platform for developing advanced POC NAATs.
- This integrated system overcomes limitations of existing LAMP-based tests by enabling automated, apparatus-free analysis.
- The developed technology holds significant potential for various POC diagnostic applications beyond SARS-CoV-2 detection.
