Modular DNA Circuits for Point-of-Care Colorimetric Assay of Infectious Pathogens

Area of Science:

• Biotechnology
• Molecular Diagnostics
• Point-of-Care Testing

Background:

• Simultaneous detection of multiple infectious pathogens is crucial for effective disease management and public health.
• Current diagnostic methods often lack the speed, specificity, or cost-effectiveness required for widespread point-of-care (POC) applications.

Purpose of the Study:

• To develop a modular DNA circuit for the simultaneous, accurate, and inexpensive detection of multiple infectious pathogens.
• To achieve high sensitivity and enable rapid, naked-eye readout for POC diagnostics.

Main Methods:

• A modular DNA circuit was designed using nucleic acid isothermal amplification and DNAzyme-mediated colorimetric readout.
• The platform integrates a fixed and a flexible module, adaptable to various genetic targets.
• Signal amplification strategies and reusable components (via urea treatment and magnetic separation) were employed.

Main Results:

• The developed platform enables simultaneous detection of multiple genetic targets corresponding to infectious pathogens.
• High sensitivity was achieved, with detection limits reaching the picomolar level.
• The assay can be completed within 2 hours, allowing for naked-eye observation and demonstrating component reusability for at least five cycles.

Conclusions:

• This rationally designed DNA circuit offers an economical, environmentally friendly, and efficient tool for POC diagnosis of multiple infectious pathogens.
• The technology holds significant potential for improving infectious disease surveillance and management, particularly in resource-poor areas.