Integrated microfluidic system for rapid forensic DNA analysis: sample collection to DNA profile.

Area of Science:

• Forensic Science
• Molecular Biology
• Analytical Chemistry

Background:

• Traditional DNA analysis in forensic settings is time-consuming.
• Multiplex short tandem repeat (STR) DNA profiling is crucial for identification.
• Current methods require extensive laboratory infrastructure.

Purpose of the Study:

• To present a fully integrated instrument for rapid DNA profile analysis.
• To enable on-site DNA analysis in forensic environments like police custody suites.
• To reduce the time from sample collection to database-compatible profile generation.

Main Methods:

• Development of an integrated instrument with on-board pumps and valves.
• Utilizing a DNA processing cartridge for purification and PCR amplification.
• Employing micro capillary electrophoresis (CE) with laser-induced fluorescence detection.
• Ensuring DNA profile compatibility with the UK DNA database format.

Main Results:

• The instrument successfully analyzes multiplex STR DNA profiles from buccal samples.
• Micro CE separation achieves a resolution of 1.2 base pairs (bp).
• The complete process from sample to database-compatible profile takes less than 4 hours.

Conclusions:

• The integrated instrument represents a significant advancement in DNA analysis technology.
• On-site DNA profiling in police custody is feasible with this technology.
• Future implementation could reduce DNA profile comparison time to as little as 3 hours.