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Validation process of automatic DNA extraction from bone material using a new advanced protocol for the EZ2 Connect instrument.
Forensic Science International. Genetics 2024 April 25
Identification of human remains using genetic methods is an important task of forensic science. DNA markers are proving essential in the identification of unknown human remains. However, environmental factors can lead to poor preservation of DNA, including in bone material. The aim of this study was therefore to compare two methods of DNA isolation from bone material: the traditional organic method and the new protocol using the EZ2 Connect instrument. The study involved three types of bone material, namely molars/premolars, petrous parts of the temporal bone and femurs, all with an estimated PMI of 70-80 years. Importantly, the biological material was obtained from three different environments, categorized as preserving, neutral and degrading, based on basic physico-chemical tests and the potential impact on the bone. The results obtained show that the DNA was best preserved in the petrous bone, followed by the teeth, and the femur. DNA extraction using the EZ2 Connect instrument with a new protocol gave slightly better results for the petrous bone, comparable results for the teeth and worse results for the femur compared to the organic method. Several protocol modifications were tested and optimal conditions for DNA isolation were proposed for the EZ2 protocol. Furthermore, the use of an automated method facilitated the effective accumulation of isolates and increased the chances of successful identification of unknown human remains.
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