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Net-Shaped DNA Nanostructure-Based Lateral Flow Assays for Rapid and Sensitive SARS-CoV-2 Detection
Saurabh Umrao1,2,3, Mengxi Zheng2,3,4, Xiaohe Jin5
1Nick Holonyak Jr. Micro and Nanotechnology Laboratory (HMNTL), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.
Analytical Chemistry
|February 2, 2024
Summary
This study introduces DNA nanostructures to improve rapid antigen tests for COVID-19. These enhanced tests show higher sensitivity and specificity, reducing false negatives for better viral infection screening.
Area of Science:
- Biotechnology and Nanotechnology
- Molecular Diagnostics
- Virology
Background:
- Lateral flow assays (LFAs) are widely used for rapid viral infection screening, including COVID-19.
- Current LFAs often have limitations in sensitivity and specificity compared to molecular tests.
- There is a need for improved rapid diagnostic tools to enhance public health screening capabilities.
Purpose of the Study:
- To enhance the sensitivity and specificity of LFAs for viral detection.
- To develop novel molecular probes using DNA nanotechnology for SARS-CoV-2 recognition.
- To improve the reliability of rapid antigen tests for infectious disease diagnostics.
Main Methods:
- Developed a Net-shaped DNA nanostructure incorporating aptamers targeting SARS-CoV-2 spike proteins.
- Replaced traditional antibodies with DNA nanostructure-based molecular probes in the LFA format.
- Evaluated the performance of the modified LFAs for detecting varying viral loads.
Main Results:
- Achieved high sensitivity in LFAs, detecting viral loads from 10^3 to 10^8 viral copies/mL.
- Demonstrated consistent sensitivity across different SARS-CoV-2 strains.
- Eliminated the need for complex sample preparation procedures.
Conclusions:
- DNA nanostructures significantly enhance the sensitivity of LFAs for SARS-CoV-2 detection.
- The improved diagnostic performance reduces false-negative results, especially at low viral loads.
- This DNA nanotechnology approach offers a promising strategy for more reliable rapid viral testing.
