Validation process of automatic DNA extraction from bone material using a new advanced protocol for the EZ2 Connect...

Area of Science:

• Forensic science
• Molecular biology
• Anthropology

Background:

• Genetic methods are crucial for identifying human remains.
• Environmental factors significantly impact DNA preservation in bone.
• Established organic DNA isolation methods face challenges with degraded samples.

Purpose of the Study:

• To compare DNA isolation efficiency from aged bone using a traditional organic method versus a novel protocol on the EZ2 Connect instrument.
• To evaluate the influence of bone type and environmental conditions on DNA recovery.
• To optimize conditions for DNA isolation from challenging forensic samples.

Main Methods:

• DNA was isolated from molars/premolars, petrous temporal bone, and femurs (70-80 years postmortem interval).
• Samples originated from preserving, neutral, and degrading environments.
• Two DNA isolation methods were compared: traditional organic extraction and an automated EZ2 Connect protocol.

Main Results:

• DNA preservation was highest in petrous bone, followed by teeth, then femur.
• The EZ2 Connect protocol yielded slightly superior results for petrous bone DNA extraction.
• Comparable results were observed for teeth, while the EZ2 Connect performed worse on femur samples compared to the organic method.

Conclusions:

• The EZ2 Connect instrument, with protocol optimization, offers a viable automated alternative for DNA isolation from aged human bone.
• Bone type significantly influences DNA yield and quality, with petrous bone being the most suitable.
• Automated DNA isolation enhances efficiency and increases the likelihood of successful identification in forensic investigations.