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Fluorescent Visualization of Mango-tagged RNA in Polyacrylamide Gels via a Poststaining Method
Published on: June 21, 2019
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RNA detection with high specificity and sensitivity using nested fluorogenic Mango NASBA.
Amir Abdolahzadeh1, Elena V Dolgosheina1, Peter J Unrau1
1Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
RNA (New York, N.Y.)
|September 26, 2019
Summary
This study introduces Nested Mango NASBA, a simple, rapid, and sensitive isothermal assay for detecting pathogenic RNA. This new method achieves single-molecule detection, offering a cost-effective alternative to existing RNA detection systems.
Area of Science:
- Molecular Biology
- Biotechnology
- Nucleic Acid Detection
Background:
- Pathogen detection relies on nucleic acid assays, but many struggle with low-copy RNA detection.
- Existing methods like RT-PCR are slow and require expensive equipment, while isothermal methods often produce amplification artifacts.
- CRISPR-based SHERLOCK system improves specificity but adds enzymatic complexity and assay time.
Purpose of the Study:
- To develop a simpler, more sensitive, and cost-effective isothermal nucleic acid detection method for pathogenic RNA.
- To overcome the limitations of existing RNA detection techniques, including speed, cost, and artifact generation.
Main Methods:
- Nesting of primer sequences within the Nucleic Acid Sequence-Based Amplification (NASBA) technique.
- Modification of inner NASBA primers to incorporate an RNA Mango aptamer sequence for fluorescent reporting.
- Development of an isothermal nucleic acid detection scheme enabling real-time monitoring.
Main Results:
- Achieved a dramatic increase in NASBA sensitivity, detecting as few as 1.5 RNA molecules per microliter.
- Demonstrated intrinsic real-time detection due to direct fluorescent reporter production.
- Confirmed high specificity of the Nested Mango NASBA system.
Conclusions:
- Nested Mango NASBA provides a cheap, simple, and specific method for rapid detection of single-molecule amounts of pathogenic RNA.
- This assay offers a significant improvement over existing RNA detection systems, addressing sensitivity and complexity challenges.
