DNA and bone structure preservation in medieval human skeletons

Area of Science:

• Paleogenetics
• Forensic Anthropology
• Molecular Biology

Background:

• Ancient DNA (aDNA) analysis is crucial for archaeological forensics but challenging due to degradation and low yields.
• Correlating skeletal morphology with aDNA preservation in archaeological human remains is limited.

Observation:

• Macroscopically well-preserved medieval human skeletons were examined using transmission electron microscopy and immunohistochemistry.
• Bone matrix and intact osteocytes with preserved nuclei were observed in the medieval bones.

Findings:

• An optimized Chelex 100 DNA extraction method effectively isolates aDNA from archaeological human bones and teeth.
• The extracted aDNA was successfully analyzed using real-time PCR (targeting SRY) and STR typing (AmpFlSTR® Identifiler kit).
• Amplicons up to 250bp were amplified, demonstrating the method's suitability for degraded DNA templates.

Implications:

• This optimized method enhances the reliability of ancient DNA analysis in archaeological and forensic contexts.
• It provides a valuable tool for identifying individuals and understanding population genetics from historical human remains.
• The findings contribute to advancing techniques for recovering and analyzing degraded DNA from challenging ancient samples.