Breakthrough in Archaeology: Ancient Human DNA Extracted from Cave Art for the First Time
Researchers have successfully recovered ancient human DNA from a red ocher dot on a cave wall in Portugal—marking the first time genetic material has been obtained from rock art itself.
A new study published in Nature Communications details how scientists analyzed 24 rock art panels from 11 caves across Spain and Portugal. The pivotal sample came from Escoural Cave, where a single red ocher dot encased under a layer of calcite mineral crust yielded mitochondrial DNA. The damage patterns on the DNA are consistent with ancient human genetic material.
Why This Sample is Unique
The absence of animal DNA in the sample strongly suggests the genetic material originated from direct human contact—such as saliva, sweat, or skin cells—rather than from environmental contamination.
Key Limitations
- Low success rate: Only one painted rock art sample out of the entire study produced ancient human DNA.
- Imprecise dating: While the cave was sealed after the Copper Age (roughly 4,000 to 5,000 years ago), DNA damage patterns suggest the sample could be older, potentially dating to the Upper Paleolithic.
- No sex determination: The Escoural painted sample did not yield enough nuclear DNA to identify the individual's sex. However, samples from unpainted walls in Escoural and Covarón Cave did provide some genetic clustering and sex inference.
- Destructive testing: The sampling process remains destructive, even when performed on a small scale.
Future Implications
This discovery opens the door to a new dimension in the study of prehistoric art and human history.
- Cave walls may now be viewed as genetic archives, preserving traces of human DNA from painting, touching, or leaning against them.
- Future research could combine DNA analysis with advanced dating techniques, and compare painted versus unpainted surfaces to refine the methodology.
- This approach may help identify which human groups created cave art, potentially differentiating between Homo sapiens and Neanderthals, as well as revealing how these ancient peoples used caves.