What is degraded DNA?
Degraded DNA refers to genetic material that has broken down over time, resulting in incomplete or damaged DNA fragments.
This can occur when biological material is exposed to environmental factors such as heat, moisture, sunlight, bacteria, or normal biological processes. As DNA degrades, it becomes more difficult for laboratories to recover full genetic profiles.
Degradation of DNA can result in partial DNA profiles or low-level DNA findings, where only limited genetic information is available for analysis. In some cases, only small sections of DNA can be detected, and the results may be less discriminating than those obtained from intact samples.
Degraded samples are more likely to produce complex results, including incomplete profiles or mixtures, and interpretation may rely more heavily on statistical evaluation and assumptions.
Degradation can occur before evidence is collected or afterwards, depending on how material is exposed, handled, stored, and transported. The condition of the sample at the time of testing plays a significant role in the quality of the DNA results obtained.
Importantly, degraded DNA does not indicate when the material was deposited or what activity led to its presence. It reflects the condition of the biological material, not the circumstances in which it arrived.
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