[A dry-reagent assay to rapidly detect Mycobacterium tuberculosis using loop-mediated isothermal amplification]

Area of Science:

• Molecular diagnostics
• Isothermal amplification techniques
• Dry-reagent technology

Context:

• Mycobacterium tuberculosis (MTB) detection remains a global health challenge, requiring rapid and accessible diagnostic tools.
• Existing molecular methods often require cold-chain storage and specialized equipment, limiting their use in resource-limited settings.
• Loop-mediated isothermal amplification (LAMP) offers a promising alternative for rapid nucleic acid amplification at a constant temperature.

Purpose:

• To develop a rapid, room-temperature-storable molecular diagnostic assay for Mycobacterium tuberculosis (MTB).
• To utilize loop-mediated isothermal amplification (LAMP) technology combined with a dry-reagent format.
• To evaluate the assay's sensitivity, specificity, and stability for potential clinical application.

Summary:

• A novel LAMP-based assay was developed for rapid detection of MTB using the IS6110 target gene, achieving results within 20 minutes.
• The assay demonstrated sensitivity comparable to PCR and high specificity against 10 other pathogens.
• Dry reagents, prepared via air-drying and freeze-drying, maintained performance after prolonged storage at elevated temperatures, indicating stability for over six months at room temperature.

Impact:

• The developed dry-reagent LAMP assay provides a rapid, stable, and potentially cost-effective method for MTB detection.
• This technology can enhance tuberculosis diagnostics, particularly in resource-limited settings lacking consistent cold-chain infrastructure.
• Facilitates quicker diagnosis and treatment initiation, contributing to improved tuberculosis control strategies.