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SARS-CoV-2 RNA Detection with Duplex-Specific Nuclease Signal Amplification
Meiqing Liu1, Haoran Li1,2, Yanwei Jia1,2,3
1State-Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, University of Macau, Macau 999078, China.
Micromachines
|March 6, 2021
Summary
A new duplex-specific nuclease (DSN)-based method detects severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA directly. This rapid assay offers sensitive detection and complements PCR for mutated viruses.
Area of Science:
- Molecular Biology
- Virology
- Biotechnology
Background:
- The COVID-19 pandemic, caused by SARS-CoV-2, highlights the need for efficient diagnostic tools.
- Current SARS-CoV-2 detection relies on reverse transcription (RT) and polymerase chain reaction (PCR), which are complex and time-consuming.
Purpose of the Study:
- To develop a simplified, rapid, and sensitive method for direct SARS-CoV-2 RNA detection.
- To establish a complementary diagnostic approach for detecting SARS-CoV-2 variants, especially those with mutations in PCR primer-binding regions.
Main Methods:
- A duplex-specific nuclease (DSN)-based signal amplification assay was designed.
- Two specific DNA probes hybridize to the SARS-CoV-2 nucleocapsid (N) gene RNA, forming DNA/RNA heteroduplexes.
- DSN enzyme cleaves DNA probes, releasing fluorescence and enabling signal amplification while preserving the target RNA.
Main Results:
- The DSN-based method demonstrated proof-of-principle detection of SARS-CoV-2 RNA.
- Optimized conditions for DSN amount, incubation temperature, and time were determined.
- A detection sensitivity of 500 pM virus RNA was achieved.
Conclusions:
- The developed DSN-based assay provides a simple, rapid, and direct method for SARS-CoV-2 RNA detection.
- This approach offers a valuable alternative or complementary tool to RT-PCR, particularly for detecting mutated strains.
- The method enhances diagnostic capabilities for emerging viral threats.
