DNA evaluation in teeth subjected to various thermal conditions: A preliminary study

Area of Science:

• Forensic Anthropology
• Molecular Biology
• Biochemistry

Background:

• Teeth are crucial for DNA recovery in forensic investigations due to their protective structure.
• High temperatures significantly degrade DNA, impacting recovery yield and quality.
• Understanding the effects of thermal stress on dental DNA is vital for forensic casework.

Purpose of the Study:

• To assess DNA recovery yield from human teeth subjected to 400°C for varied durations.
• To establish preliminary data on the impact of heat exposure time on dental DNA extraction.

Main Methods:

• Human molars were divided into three groups and exposed to 400°C for 15, 30, and 60 minutes.
• DNA was extracted using a commercial kit (QIAamp DNA Investigator Kit) after pulverization.
• Quantification was performed using spectrophotometry, with statistical analysis via ANOVA and Tukey's HSD tests.

Main Results:

• DNA concentration significantly decreased as heat exposure time increased.
• The 15-minute exposure group yielded significantly higher DNA concentrations than the 30- and 60-minute groups (p < 0.05).
• DNA purity, indicated by the 260/280 ratio, showed no significant differences across exposure times.

Conclusions:

• DNA can be recovered from teeth exposed to 400°C, though yield is time-dependent.
• Further research is needed to evaluate genetic material quality for definitive forensic identification.
• Findings offer guidance for developing protocols for DNA extraction in degraded forensic samples.