Optimization of ultrahigh-speed multiplex PCR for forensic analysis.

Area of Science:

• Forensic Science
• Molecular Biology
• Biotechnology

Background:

• Conventional PCR amplification of forensic DNA can be time-consuming.
• Existing methods may not be suitable for rapid on-site analysis.
• Short tandem repeat (STR) genotyping is crucial for forensic investigations.

Purpose of the Study:

• To design and optimize an ultrafast PCR amplification technique for forensic STR loci.
• To achieve multiplex PCR amplification in under 10 minutes.
• To ensure compatibility with existing capillary electrophoresis and emerging microfluidic systems.

Main Methods:

• Utilized a high-speed polymerase and rapid cycling protocol for multiplex PCR.
• Optimized master mix reagents (enzyme, buffer, MgCl2, dNTPs) and primer ratios.
• Tested amplification sensitivity, reproducibility, and compatibility with capillary electrophoresis and microfluidics.
• Employed a portable high-speed thermocycler for potential on-site applications.

Main Results:

• Achieved multiplex PCR amplification of seven forensic STR loci in 6.5 minutes.
• Demonstrated successful optimization of reagent concentrations and cycling conditions.
• Confirmed compatibility with both conventional capillary electrophoresis and microfluidic chip devices.
• Showcased the portability and potential for rapid, inexpensive on-site genotyping.

Conclusions:

• The developed ultrafast PCR technique significantly reduces DNA amplification time for forensic analysis.
• This method offers a rapid and portable solution for screening suspects and victims.
• The technique is adaptable to current and future forensic genotyping platforms.