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Updated: Jun 3, 2026
Enhanced Genetic Analysis of Single Human Bioparticles Recovered by Simplified Micromanipulation from Forensic ‘Touch DNA’ Evidence
Published on: March 9, 2015
Optimization and validation of a fast amplification protocol for AmpFlSTR® Profiler Plus® for rapid forensic human
Nancy Laurin1, Chantal Frégeau
1Royal Canadian Mounted Police, Forensic Science & Identification Services, National Services and Research, 1200 Vanier Parkway, Ottawa, ON, Canada. nancy.laurin@rcmp-grc.gc.ca
This study optimized a rapid amplification protocol for short tandem repeat (STR) profiling using AmpFlSTR® Profiler Plus®, reducing human DNA identification time from 4 hours to 26 minutes without compromising data quality. The validated method enhances throughput for time-sensitive forensic cases.
Area of Science:
- Forensic Science
- Molecular Biology
- Genetics
Background:
- Multiplex amplification of short tandem repeat (STR) loci is crucial for human DNA identification.
- Current protocols can be time-consuming, impacting laboratory throughput and case turnaround times.
Purpose of the Study:
- To optimize and validate a rapid amplification protocol for the AmpFlSTR® Profiler Plus® system.
- To expedite human DNA identification by significantly reducing amplification time.
Main Methods:
- Modified PCR cycling conditions using a high-speed DNA polymerase (SpeedSTAR™ HS) and an efficient thermal cycler (Bio-RAD C1000™).
- Validated the protocol against the standard Royal Canadian Mounted Police (RCMP) amplification protocol for specificity, sensitivity, and profile quality.
Main Results:
- Reduced amplification time from 4 hours to 26 minutes.
- Achieved complete concordance with the standard protocol, including reliable typing of minor alleles in mixture samples.
- Observed a minor increase in n-4 stutter ratios (average 2.2%) with the rapid protocol.
Conclusions:
- The developed rapid amplification protocol is robust and provides comparable data to the standard method.
- This approach offers a viable alternative to increase throughput or expedite time-sensitive forensic investigations.
