A fully integrated and automated 24-sample microfluidic system for sample-in-amplicon-out forensic analysis.

Area of Science:

• Forensic Science
• Biotechnology
• Microfluidics

Background:

• High-throughput DNA profiling is essential for forensic science.
• Current methods face limitations in sample throughput, system integration, and cost.

Purpose of the Study:

• To develop a fully integrated microfluidic system for automated, end-to-end forensic DNA analysis.
• To assess the system's performance in terms of throughput, reliability, and cost-effectiveness.

Main Methods:

• A microfluidic system with integrated modules for cell lysis, DNA extraction/purification, multiplex PCR, and STR analysis was developed.
• Electromagnetic membrane valves and solenoid/rotary valve systems controlled fluidics and reagent handling.
• The system processed 24 samples in parallel within a sealed cartridge.

Main Results:

• Achieved a coefficient of variation (CV) of 3.14% for 24 parallel samples.
• Demonstrated high-quality short tandem repeat (STR) amplicons from buccal swabs and FTA cards.
• Completed 24-sample processing in under 6 hours at a per-sample cost below $50.

Conclusions:

• The integrated microfluidic system provides a viable solution for high-throughput forensic DNA analysis.
• The platform offers significant improvements in speed, integration, and cost compared to conventional methods.
• This technology has the potential to enhance forensic DNA profiling capabilities.