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Author Spotlight: Advancing Pathogen Diagnostics with Standardized LAMP
Published on: September 8, 2023
785
Detection of Reverse Transcriptase LAMP-Amplified Nucleic Acid from Oropharyngeal Viral Swab Samples Using
Saloni Agarwal1, Mojdeh Hamidizadeh1, Frank F Bier1,2
1Institute for Biochemistry and Biology, Chair of Molecular Bioanalysis and Bioelectronics, University of Potsdam, Karl-Liebknecht-Strasse 24/25, 14476 Potsdam, Germany.
Biosensors
|November 24, 2023
Summary
This study developed a rapid, 35-minute nucleic acid test for SARS-CoV-2 using crude throat swabs. The assay achieves high sensitivity and specificity, enabling point-of-care diagnostics without sample pre-processing.
Area of Science:
- Molecular Biology
- Biotechnology
- Diagnostics
Background:
- Current nucleic acid testing for pathogens often requires extensive sample preparation, limiting point-of-care applications.
- Rapid and sensitive detection methods are crucial for timely diagnosis and control of infectious diseases.
Purpose of the Study:
- To develop a streamlined nucleic acid testing-point of care technique (NAT-POCT) for pathogen detection.
- To evaluate the use of crude throat swab samples directly in a rapid assay.
- To implement a digital semi-quantification method for improved readout accuracy.
Main Methods:
- Utilized crude, heat-inactivated throat swab samples directly in Recombinase-aided Amplification-Loop-mediated Isothermal Amplification (RT-LAMP) reactions.
- Employed a biotinylated DNA probe for enhanced specificity in Lateral Flow Assay (LFA) readouts.
- Integrated a smartphone-based in vitro diagnostic (IVD) device for digital semi-quantification of LFA results.
Main Results:
- The RT-LAMP-LFA assay demonstrated 98.11% sensitivity and 96.15% specificity.
- Achieved a limit of detection (LoD) of three RNA copies/µL (Ct-33) within a total assay time of 35 minutes.
- Digital semi-quantification showed a strong correlation (R² = 0.702) with qRT-PCR Ct values.
Conclusions:
- The developed NAT-POCT platform is a versatile biosensor for pathogen detection.
- The assay eliminates the need for sample storage, transportation, and pre-processing, facilitating rapid point-of-care diagnostics.
- This approach holds significant potential for infectious disease surveillance and management.
