A Rapid Digital PCR System with a Pressurized Thermal Cycler

Area of Science:

• Biotechnology
• Molecular Biology
• Materials Science

Background:

• Digital polymerase chain reaction (dPCR) offers high sensitivity for nucleic acid quantification.
• Traditional dPCR methods face challenges with sample loading efficiency and droplet evaporation.
• Developing user-friendly and robust dPCR platforms is crucial for accurate molecular diagnostics.

Purpose of the Study:

• To design and validate a novel silicon-based static droplets array (SDA) chip for rapid digital polymerase chain reaction (dPCR).
• To establish an efficient sample loading method for high-throughput dPCR.
• To demonstrate the capability of the developed platform for quantitative DNA detection with real-time fluorescence monitoring.

Main Methods:

• Fabrication of a silicon-based SDA chip with 2704 microwells (0.785 nL each).
• Implementation of a direct scraping method for rapid sample loading (<10 seconds).
• Utilized a pressurized thermal cycling device to prevent droplet evaporation during dPCR.

Main Results:

• The SDA chip enabled efficient and rapid sample loading for dPCR.
• Quantitative detection of hepatitis B virus (HBV) DNA was successfully demonstrated using the platform.
• The system achieved real-time fluorescence intensity measurement, validating its accuracy for DNA quantification.

Conclusions:

• The developed silicon-based SDA chip and dPCR platform provide a simple, efficient, and accurate solution for quantitative DNA detection.
• The platform addresses key challenges in dPCR, including sample loading and evaporation.
• This technology holds promise for advancing molecular diagnostics and research applications requiring sensitive nucleic acid quantification.