Thermal Effects on DNA Degradation in Blood and Seminal Stains: Forensic View

Area of Science:

• Forensic Science
• Molecular Biology
• Genetics

Background:

• DNA analysis is crucial in forensic investigations.
• Crime scene samples face diverse environmental conditions.
• Understanding sample degradation is vital for accurate results.

Purpose of the Study:

• To assess the impact of varying temperatures and burning on DNA extraction.
• To evaluate the effects on DNA typing from blood and seminal stains.
• To determine the threshold for DNA integrity under thermal stress.

Main Methods:

• Collected blood and semen samples from volunteers.
• Exposed stains to temperatures: 100°C, 50°C, 37°C, 4°C, -20°C, and burning.
• Performed preliminary tests and DNA analysis.

Main Results:

• High temperatures (100°C, 50°C) and burning reduced DNA concentration in blood and semen.
• Preliminary tests identified stains at moderate temperatures (37°C, 4°C, -20°C).
• Burning significantly impacted DNA quantity and quality, affecting identification.

Conclusions:

• Elevated temperatures primarily affect DNA quantity, with less impact on quality.
• Burning severely compromises both DNA quantity and quality, hindering forensic analysis.
• Thermal stress management is critical for preserving DNA evidence.