Yes, dead bones can contain DNA.
While soft tissues degrade relatively quickly after death, the rigid structure of bones and teeth offers a degree of protection to the DNA within them. This means that analyzable DNA often persists in bones and teeth much longer than in soft tissues.
Here's a breakdown:
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Protection: The mineral matrix of bone and teeth provides a physical barrier against environmental factors that degrade DNA, such as:
- Moisture
- Temperature fluctuations
- Enzymatic activity
- UV radiation
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Longevity: This protection allows DNA to survive for extended periods, sometimes thousands of years.
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Analyzable DNA: Although the DNA in ancient bones is often fragmented and damaged, advancements in DNA extraction and sequencing technologies have made it possible to retrieve and analyze DNA from even very old skeletal remains. This is extremely helpful in solving legal cases or tracing human history and origins.
Therefore, although the quantity and quality of DNA in dead bones may vary greatly depending on the age and preservation conditions of the bone, DNA is often present and retrievable.
