Real-time DNA Amplification and Detection System Based on a CMOS Image Sensor.

Area of Science:

• Biotechnology
• Molecular Diagnostics
• Sensor Technology

Background:

• Isothermal amplification techniques like LAMP are crucial for rapid molecular diagnostics.
• Existing methods often require complex instrumentation or are not easily miniaturized.
• Real-time detection integrated with amplification is highly desirable for point-of-care applications.

Purpose of the Study:

• To develop a novel polypropylene complementary metal oxide semiconductor (CMOS) platform for integrated loop-mediated isothermal amplification (LAMP).
• To achieve simultaneous real-time DNA amplification and optical detection using a CMOS image sensor.
• To demonstrate the platform's efficiency and potential for portable molecular diagnostics.

Main Methods:

• Integrated a CMOS image sensor with a polypropylene-based platform for loop-mediated isothermal amplification (LAMP).
• Developed an amplification-coupled detection system measuring photon number changes and color shifts.
• Utilized UV-spectral studies, optical color intensity, pH analysis, and electrophoresis for validation.
• Employed Clostridium perfringens for proof-of-concept detection.

Main Results:

• The CMOS platform successfully performed real-time DNA amplification and detection via LAMP.
• Photon number decrease correlated with amplification, detected by the CMOS image sensor and ADC.
• Validation studies confirmed the efficiency of the CMOS sensor-based LAMP system.
• Successful proof-of-concept detection of Clostridium perfringens was achieved.

Conclusions:

• The developed CMOS image sensor-based LAMP method enables simultaneous real-time DNA amplification and detection.
• This approach facilitates the creation of cost-effective, label-free, optical, and portable molecular diagnostic devices.
• The technology holds significant promise for advancing point-of-care molecular diagnostics.