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Validation of testing and interpretation protocols for low template DNA samples using AmpFlSTR Identifiler.
Theresa Caragine1, Rebecca Mikulasovich, Jeannie Tamariz
1Department of Forensic Biology, Office of Chief Medical Examiner of the City of New York, 421 East 26th Street, New York, NY 10016, USA. tcaragine@ocme.nyc.gov
Croatian Medical Journal
|May 30, 2009
Summary
Short tandem repeat (STR) profiling of low template DNA (LT-DNA) is reliable and robust when using defined testing and interpretation parameters. This validated method, with quality control, is suitable for forensic casework.
Area of Science:
- Forensic Science
- Molecular Biology
- Genetics
Background:
- Low template DNA (LT-DNA) presents challenges in forensic analysis due to stochastic effects.
- Standardized testing and interpretation parameters are crucial for reliable LT-DNA profiling.
Purpose of the Study:
- To evaluate the reliability, robustness, and reproducibility of short tandem repeat (STR) profiling for LT-DNA.
- To establish and validate defined testing and interpretation parameters for LT-DNA analysis.
Main Methods:
- Quantitative real-time PCR was used to measure DNA down to less than 1 pg/µL.
- DNA extracts were amplified in triplicate using enhanced PCR conditions and analyzed independently.
- Interpretation protocols were developed considering stochastic effects and validated on over 800 samples.
Main Results:
- Reproducible results were obtained for DNA amounts of 100 pg or less, with anticipated stochastic effects.
- Allele detection rates were 92% or higher down to 25 pg, with lower amounts yielding partial profiles.
- 100% accurate allelic assignments were achieved for over 400 casework samples using the developed protocols.
Conclusions:
- The established protocols and interpretation guidelines demonstrate that LT-DNA testing is reliable and robust for forensic applications.
- Implementation of verified methods with quality control ensures the suitability of LT-DNA testing in forensic science.
