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DNA mixtures interpretation - A proof-of-concept multi-software comparison highlighting different probabilistic
E Alladio1, M Omedei2, S Cisana2
1Dipartimento di Chimica, Università degli Studi di Torino, Via P. Giuria 7, 10125, Torino, Italy; Centro Regionale Antidoping e di Tossicologia "A. Bertinaria", Regione Gonzole 10/1, 10043, Orbassano, Torino, Italy.
Forensic Science International. Genetics
|September 3, 2018
Summary
Fully-continuous probabilistic methods for DNA mixture interpretation, especially for Low-Template DNA, yield higher likelihood ratios than semi-continuous approaches. This difference was consistent across various DNA amplification kits used in the study.
Area of Science:
- Forensic Science
- Genetics
- Statistical Analysis
Background:
- Interpreting DNA mixtures, particularly those with Low-Template DNA (LT-DNA), presents significant challenges in forensic science.
- Probabilistic methods, including semi-continuous and fully-continuous approaches, are crucial for DNA mixture interpretation.
- The influence of different statistical software and DNA amplification kits on interpretation outcomes requires thorough investigation.
Purpose of the Study:
- To compare the performance of semi-continuous and fully-continuous probabilistic methods for DNA mixture interpretation.
- To evaluate these methods specifically with Low-Template DNA (LT-DNA) mixtures.
- To assess the impact of different DNA amplification kits on the interpretation results.
Main Methods:
- Utilized five statistical interpretation software: Lab Retriever, LRmix Studio (semi-continuous), and DNA•VIEW®, EuroForMix, STRmix™ (fully-continuous).
- Prepared and analyzed DNA mixtures with 2 and 3 known contributors, varying DNA concentrations, including LT-DNA samples.
- Amplified samples using seven different DNA amplification kits to test for kit-specific biases.
Main Results:
- Fully-continuous computation methods consistently produced higher likelihood ratio values compared to semi-continuous methods.
- This difference in likelihood ratios was observed regardless of the DNA amplification kit employed.
- The study highlighted a trend where fully-continuous approaches provide more pronounced results in DNA mixture interpretation.
Conclusions:
- Fully-continuous probabilistic methods offer a distinct, often higher, magnitude of evidence compared to semi-continuous methods for DNA mixture interpretation.
- The choice of DNA amplification kit did not significantly alter the observed trend between the two probabilistic approaches.
- These findings are critical for understanding the nuances of statistical interpretation in forensic DNA analysis, especially for challenging LT-DNA samples.
