Rapid Isothermal Amplification and Portable Detection System for SARS-CoV-2.

Area of Science:

• Molecular Biology
• Virology
• Diagnostic Assay Development

Background:

• The COVID-19 pandemic highlighted the need for accessible and rapid diagnostics.
• Isothermal amplification methods like RT-LAMP offer advantages over RT-PCR for point-of-use testing due to constant temperature requirements and robustness with unprocessed samples.
• Existing diagnostic methods often require complex laboratory infrastructure and extensive sample preparation.

Approach:

• Developed and characterized an RT-LAMP assay for SARS-CoV-2 detection.
• Tested the assay using spiked synthetic nasal fluids and viral transport medium (VTM), bypassing RNA extraction.
• Evaluated assay performance, including Limit-of-Detection (LOD), and demonstrated real-time point-of-use testing capabilities using a 3D-printed cartridge and smartphone reader.

Key Points:

• Achieved an LOD of 50 RNA copies/μL in VTM within 20 minutes and 5000 RNA copies/μL in nasal fluid.
• Demonstrated SARS-CoV-2 detection in under 40 minutes using an integrated point-of-use system.
• Highlighted speed and cost advantages compared to traditional RT-PCR workflows.

Conclusions:

• The developed RT-LAMP assay provides a rapid, simple, and cost-effective alternative for SARS-CoV-2 diagnostics.
• This method is suitable for point-of-use testing, potentially increasing diagnostic accessibility.
• The findings can accelerate the development and deployment of diagnostics for emerging infectious diseases.