Microfluidic devices harboring unsealed reactors for real-time isothermal helicase-dependent amplification.

Area of Science:

• Biotechnology
• Microfluidics
• Molecular Diagnostics

Background:

• High-throughput nucleic acid amplification requires sealed reactors to prevent evaporative loss and cross-contamination.
• Conventional devices use microvalves and micropumps, increasing cost and complexity.
• Existing methods face challenges in chip fabrication and operational processes.

Purpose of the Study:

• To develop a simplified microfluidic device for high-throughput nucleic acid amplification.
• To overcome limitations of sealed reactors, microvalves, and micropumps in microchip devices.
• To enable efficient amplification in open reactors using a novel flow scheme.

Main Methods:

• Development of microfluidic devices with open reactors.
• Implementation of a single-step capillary-based flow scheme for sequential reagent distribution.
• Optimized reactor design, smooth internal surfaces, and localized heating for isothermal, real-time helicase-dependent amplification (HDA).

Main Results:

• Demonstration of successful nucleic acid amplification in open reactors.
• Prevention of evaporative loss and cross-contamination through optimized reactor design and localized heating.
• Simplified device architecture reducing cost and fabrication complexity.

Conclusions:

• Open reactors in microfluidic devices are viable for high-throughput nucleic acid amplification.
• The capillary-based flow scheme and optimized reactor design effectively manage amplification in unsealed systems.
• This approach offers a cost-effective and less complex alternative for molecular diagnostics.