High-throughput STR analysis for DNA database using direct PCR.

Area of Science:

• Forensic Science
• Molecular Biology
• Biotechnology

Background:

• The Korean criminal DNA database, established in 2010, requires efficient profiling of short tandem repeat (STR) loci.
• Automated, high-throughput, and cost-effective DNA profiling systems are crucial for large-scale databases.

Purpose of the Study:

• To develop and validate a direct PCR profiling system for DNA databases, eliminating the DNA purification step.
• To compare the performance of direct PCR with conventional PCR for STR analysis in a forensic context.

Main Methods:

• Development of a direct PCR buffer system for DNA profiling without prior DNA purification.
• Optimization of direct PCR and conventional PCR protocols.
• Comparative analysis of PCR success rates, electropherogram quality, and STR locus peak height ratios.

Main Results:

• The direct PCR system demonstrated perfect concordance with the conventional PCR system.
• High PCR success rates (>97%), excellent electropherogram quality, and optimal intra/inter-loci peak height ratios were achieved.
• The proportion of DNA extraction required due to direct PCR failure was minimized to less than 3%.

Conclusions:

• The developed direct PCR system is a viable, time- and cost-saving alternative for automated DNA database profiling.
• This method can effectively replace or supplement conventional PCR systems in forensic applications.
• The direct PCR approach enhances the efficiency and cost-effectiveness of criminal DNA database management.