DNA in cut hair can be detectable for up to a week, but its quality degrades rapidly after that. Once the protective keratin layer is compromised, the DNA's genetic information begins to degrade, making comprehensive analysis increasingly difficult.
DNA Degradation in Cut Hair
Here's a breakdown of the factors influencing DNA longevity in cut hair:
- Keratin Protection: Keratin acts as a barrier, protecting the DNA within the hair shaft. Once this barrier is damaged, DNA degradation accelerates.
- Time Factor: According to provided information, even though nuclear DNA may be barely noticeable up to a week after hair is cut, the possibility of modern analysis to provide fully recognizable profiles become far less probable over time.
- Environmental Conditions: Factors like humidity, temperature, and exposure to sunlight can influence the rate of DNA degradation.
- DNA Type: Nuclear DNA is more informative and generally degrades slower than mitochondrial DNA.
Factors Affecting DNA Recovery
Several factors can impact the successful recovery and analysis of DNA from cut hair:
- Storage Conditions: Proper storage in a cool, dry, and dark environment can help preserve DNA.
- Contamination: Avoiding contamination during handling and storage is crucial.
- Laboratory Techniques: Advanced DNA extraction and amplification techniques can enhance the chances of obtaining usable DNA profiles.
