A practical study on direct PCR amplification using the GlobalFiler™ PCR Amplification Kit on human bloodstains...

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• Rapid DNA profiling is crucial for timely law enforcement investigations.
• Traditional DNA profiling involves time-consuming extraction and quantification steps.
• New methods are needed to accelerate DNA analysis from casework samples.

Purpose of the Study:

• To evaluate the feasibility of direct PCR amplification using the microFLOQ™ Direct swab for rapid DNA profiling.
• To assess the impact of a PCR additive on DNA profile quality.
• To compare the direct amplification method with the standard DNA profiling workflow.

Main Methods:

• Direct PCR amplification of bloodstains using the microFLOQ™ Direct swab and GlobalFiler™ PCR Amplification Kit.
• Testing the effect of a PCR additive on DNA profile peak heights.
• Evaluating performance on various casework substrates (denim, knife, tissue, leather, shirt).
• Comparison with a standard workflow involving DNA extraction (DNA-IQ™ on Maxwell® 16), quantification, amplification, and electrophoresis.

Main Results:

• Direct PCR amplification was feasible within 3 hours.
• Addition of a PCR additive enhanced DNA profile peak heights approximately twofold.
• DNA profiles generated on various substrates met laboratory thresholds.
• Direct amplification yielded DNA profiles with peak heights similar to or exceeding the standard workflow.

Conclusions:

• The microFLOQ™ Direct swab enables rapid DNA profiling from casework samples.
• Direct PCR amplification offers a faster alternative to conventional methods without compromising profile quality.
• This workflow can significantly support law enforcement by accelerating perpetrator identification.