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High-throughput sample-to-answer detection of DNA/RNA in crude samples within functionalized micro-pipette tips
Biosensors & Bioelectronics
|August 19, 2015
Summary
A novel micro-pipette tip-based nucleic acid test (MTNT) enables rapid, high-throughput detection of DNA and RNA from crude samples. This method simplifies sample-to-answer nucleic acid testing for point-of-care applications.
Area of Science:
- Biotechnology
- Molecular Biology
- Point-of-Care Diagnostics
Background:
- Traditional nucleic acid tests often require extensive sample preparation and specialized equipment, limiting their use in resource-limited settings.
- The need for rapid, sensitive, and user-friendly diagnostic tools for both DNA and RNA detection remains critical for infectious disease surveillance and early cancer detection.
Purpose of the Study:
- To develop and validate a micro-pipette tip-based nucleic acid test (MTNT) for direct, high-throughput, sample-to-answer detection of DNA and RNA.
- To assess the performance of MTNT using various crude biological samples, including cells, bacteria, and plant tissues.
- To evaluate the potential of MTNT as a low-cost, point-of-care diagnostic tool for remote areas.
Main Methods:
- Development of integrated micro-pipette tips containing nucleic acid extraction membranes and reagents for loop-mediated isothermal amplification (LAMP).
- Direct assaying of crude samples (cells, bacteria, plant tissues) without prior nucleic acid extraction or purification.
- High-throughput testing using an eight-channel pipette and a custom mini-heater, achieving up to 40 samples per run.
Main Results:
- MTNT successfully detected DNA and RNA from diverse crude samples within 90-160 minutes.
- Achieved a limit of detection as low as 2 copies for target DNA fragments (Ebola virus) and 8 CFU for bacteria (E. coli).
- Demonstrated detection of CK-19 mRNA from as few as 2 cancer cells, showcasing high sensitivity for RNA analysis.
Conclusions:
- MTNT offers a streamlined, sensitive, and high-throughput approach for nucleic acid testing directly from crude samples.
- The method eliminates the need for complex sample pretreatment and containment, making it suitable for point-of-care diagnostics.
- MTNT shows significant promise for accessible and affordable nucleic acid testing in remote or low-resource settings.
