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Comparative analysis of DNA extraction processes for DNA-based identification from putrefied bodies in forensic
Sonja Uerlings1, Vanessa Welter1, Burkhard Madea1
1Institute of Legal Medicine, University Hospital Bonn, Stiftsplatz 12, 53111, Bonn, Germany.
Forensic Science International
|February 6, 2021
Summary
Forensic DNA extraction from putrefied bodies is challenging. Nails are the most suitable tissue for DNA identification, yielding reliable results with both tested kits.
Area of Science:
- Forensic Science
- Molecular Biology
- Genetics
Background:
- Postmortem identification is crucial in forensic investigations.
- Advanced decomposition can render traditional identification methods ineffective.
- DNA analysis is a preferred method when morphological identification fails.
Purpose of the Study:
- To compare the efficacy of two commercial DNA extraction kits for putrefied samples.
- To evaluate different tissue types for optimal DNA yield and quality.
- To identify the most suitable tissue for DNA-based identification of decomposed remains.
Main Methods:
- DNA was extracted from 20 putrefied corpses using DNeasy® Blood & Tissue kit and SwabSolution™ kit.
- Five soft tissues (brain, aorta, liver, kidney, psoas major muscle) and nails were analyzed.
- DNA quantity, quality, and profile integrity were assessed.
Main Results:
- DNeasy® Blood & Tissue kit generally yielded higher DNA quantities and better quality compared to SwabSolution™.
- Both kits produced comparable DNA profiles, indicating similar qualitative performance.
- Nails proved to be the most suitable tissue type for DNA extraction from putrefied bodies.
Conclusions:
- Nails are the optimal tissue source for DNA extraction in forensic identification of putrefied remains.
- While DNeasy® kit offered quantitative advantages, both kits provided reliable DNA profiles.
- This study aids in optimizing DNA extraction protocols for challenging forensic cases.
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