Researchers have identified human DNA at least 2,000 years old on cave walls in Portugal and Spain, according to a report by Lusa News Agency. This discovery provides the first evidence that cave walls can preserve human genetic material for thousands of years.
How did researchers find ancient DNA on cave walls?
An international team of scientists used advanced DNA extraction and sequencing techniques to locate genetic material embedded in cave surfaces. The researchers recovered five authentic ancient human DNA samples, all of which date back at least two millennia, according to reports from Lusa News Agency and Xinhua News Agency.
The team found the DNA in two distinct environments. In Portugal’s Escoural Cave, the genetic material was detected within a pigmented calcite crust. The researchers also successfully identified DNA in several unpigmented cave wall samples from both Escoural Cave and Covaron Cave in Spain.
Unlike traditional bone analysis, which requires physical remains, this method allows scientists to “read” the history of a site directly from its walls.
Why does this discovery change the field of archaeology?
This finding offers a non-invasive alternative to traditional archaeological methods. Usually, understanding prehistoric populations requires disturbing archaeological deposits, such as digging up bones or tools. This new approach allows researchers to study human presence without altering the site’s physical structure.
The team told the media that cave walls could serve as biological archives of prehistoric human activity, offering a new approach to understanding how prehistoric people used caves and to investigating the identity of the creators of some cave art.
A new way to track human movement
Because the DNA is preserved in the calcite and pigments of the walls, it provides a permanent record of whoever entered the space. This provides a direct link to the biological reality of the people who once inhabited or utilized these caves.
What information can scientists extract from cave DNA?
The ability to sequence DNA from cave surfaces opens several doors for future research. According to the research team, future analyses of this preserved material may reveal specific biological details about ancient populations, including:
- Biological sex: Determining the gender makeup of groups using the caves.
- Genetic ancestry: Mapping the lineage and origins of prehistoric people.
- Human movement: Tracking how different groups migrated through specific geographic regions.
This method could potentially resolve long-standing debates regarding the creators of various prehistoric cave paintings by providing direct genetic links to the artists.
Keep an eye on “environmental DNA” (eDNA) research. This growing field is moving away from studying objects and toward studying the microscopic traces left behind by living organisms.
Frequently Asked Questions
- Where was the ancient DNA discovered?
- The DNA was found on cave walls in Escoural Cave in Portugal and Covaron Cave in Spain.
- How old is the DNA found in the caves?
- The samples are at least 2,000 years old.
- Can this method be used on all cave walls?
- Researchers found DNA in both pigmented calcite crusts and unpigmented samples, suggesting a wide potential for application.
What do you think about this new method of studying history? Do you think non-invasive archaeology should become the industry standard? Let us know in the comments below or subscribe to our newsletter for more updates on scientific breakthroughs.
