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Yes. A peer-reviewed study published in Nature Communications on 23 June 2026 recovered authentic ancient human mitochondrial DNA from cave-wall material in Spain and Portugal, including one pigmented calcite crust associated with rock art. The finding demonstrates that human DNA can survive on cave walls for thousands of years.
It does not show that the DNA came from the person who made nearby art. DNA may have arrived through direct contact, bodily fluids, sediment, water, or later human activity, and the study did not directly date when it was deposited.
What the 2026 study actually found
Bossoms Mesa and colleagues investigated whether cave-wall surfaces could preserve ancient human DNA. They sampled material around 24 rock-art panels in 11 caves across Spain and Portugal. The panels represented several forms of prehistoric imagery, including simple marks, hand stencils and figurative paintings.
Researchers collected 54 samples from the panels. Depending on the site, they separated pigment-bearing material, adjacent unpigmented wall surfaces and other cave materials for comparison. The wider analysis included cave sediments, animal bones and material from a suspected Altamira airbrush.
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Five samples contained authentic ancient human mitochondrial DNA. Only one of those five was a pigmented rock-art sample; the other four came from unpigmented wall surfaces. That result is a proof of preservation, not evidence that DNA recovery from painted cave surfaces is normally successful.
| Evidence reported by the study | Result |
|---|---|
| Rock-art panels examined | 24 panels in 11 caves |
| Total rock-art samples collected | 54 |
| Samples with authentic ancient human mitochondrial DNA | 5 |
| Positive pigmented rock-art samples | 1 |
| Positive unpigmented wall samples | 4 |
The study therefore answers the narrow preservation question clearly: ancient human DNA can be recovered from cave-wall material, including a pigmented surface. It does not answer the separate historical question of who made a particular painting.
Where the positive samples came from
Escoural Cave
At Escoural Cave in Portugal, researchers detected human DNA in a pigmented calcite crust and in an unpigmented wall sample. Neither sample contained detectable faunal DNA. The authors regard that combination as consistent with a direct human source, such as skin contact or bodily fluids, although consistency is not proof of one specific route.
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Escoural has an additional archaeological constraint. The cave was sealed after the Chalcolithic period and reopened in 1963. Because later access was blocked, the authors infer that DNA preserved there is at least about 4,000 to 5,000 years old. This is a minimum-age inference from site history, not a direct measurement of the DNA’s deposition date or the age of adjacent artwork.
Covarón Cave
At Covarón in Spain, two unpigmented wall samples contained human nuclear DNA. Their genetic signals fell within the variation associated with Western hunter-gatherers in the study’s comparison set. That is a population-level affinity: it does not identify an individual, assign a sex, provide a name or establish that the person produced nearby art.
Three other unpigmented samples contained both human and faunal DNA. Mixed biological material makes indirect transfer especially plausible. Sediment carrying DNA, water movement, or later contact could have brought material to the wall without the person whose DNA was detected ever touching the sampled surface.
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How human DNA can reach a cave wall
Finding human DNA establishes that biological material survived and was recoverable. It does not, by itself, establish the route or timing of deposition. Several pathways are scientifically plausible:
- Direct contact: A person may have touched the wall, brushed against it, or left skin cells, saliva, blood or another bodily fluid.
- Material associated with painting: DNA could have entered a pigment mixture or reached a wet surface during preparation or application.
- Sediment transfer: Cave-floor sediment can contain human and animal DNA. Dust, particles on feet or tools, or other movement can transfer that material upward.
- Water movement: Seepage or runoff can move dissolved or suspended biological material across a wall.
- Later human activity: A person entering the cave centuries or millennia after the artwork was made could have deposited DNA on the same surface.
The Escoural samples containing human DNA without detectable faunal DNA are compatible with direct deposition, while the mixed human-and-faunal samples illustrate why indirect movement must remain in the explanation. These interpretations describe likelihoods, not observations of the original event.
Did the DNA come from the people who made the art?
The study cannot make that connection. Even if DNA reached a painted area through direct contact, the transfer may have happened long after painting. A later visitor could have touched a calcite crust that formed over older pigment, or material could have moved from a nearby sediment layer.
To argue for an art-making connection, researchers would need a repeatable pattern that separates pigment-bearing areas from nearby unpigmented controls. Useful signals might include consistently higher DNA abundance in pigment, higher recovery success from painted surfaces, or population affinities that recur in a way compatible with the people who occupied the site. The reported study did not provide that level of evidence.
The recovery rate also limits the claim. Human DNA appeared in five of 54 samples, and only one of 24 sampled panels yielded human DNA in pigmented material. Pigment-bearing surfaces may rarely preserve enough DNA to detect after thousands of years, although different materials, techniques and cave conditions could perform differently.
How old is the recovered DNA?
No sample in the study received a direct calendar date for the DNA itself. Instead, researchers used molecular damage patterns and archaeological context to establish minimum constraints.
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| Age evidence | What it supports | What it cannot establish |
|---|---|---|
| DNA damage patterns in one Covarón sample | A minimum age of about 1,000 years | The exact deposition date or age of nearby art |
| DNA damage patterns in the other cave-wall samples | Minimum ages of about 2,000 years | A precise calendar age; considerably older DNA remains possible |
| Escoural cave history | DNA there is inferred to be at least about 4,000–5,000 years old because the cave was sealed after the Chalcolithic and reopened in 1963 | A direct date for the DNA or the adjacent rock art |
Damage accumulates in ancient DNA molecules over time, so characteristic patterns can show that material is old rather than modern. They do not function as a timestamp. Likewise, a sealed archaeological context limits the latest possible access but does not reveal the day, century or activity that deposited the DNA.
Can the DNA identify an individual artist?
No. The study recovered mitochondrial DNA in the positive samples and nuclear DNA in the two Covarón samples discussed for population affinity. Mitochondrial sequences trace a maternal line and generally provide less individual-level discrimination than a complete nuclear genome. The Covarón result places the recovered material within a broad Western hunter-gatherer variation, not a named person or a unique artist profile.
Even a highly informative genome would still require a secure chain of association between the DNA and the act of painting. Without that chain, a genetic profile could belong to a visitor, a worker, a person represented by transported sediment or another contributor unrelated to the artwork’s creation.
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How contamination was controlled
Sampling ancient DNA from a visible archaeological surface requires both genetic precautions and conservation restraint. The researchers adapted collection methods to each panel, worked under permits and conservation restrictions, and sought to limit visual damage. Their stated protections against modern human contamination included double layers of nitrile and/or latex gloves, disposable arm covers and face masks.
Laboratory extraction and sequencing used specialist ancient-DNA procedures. Those methods help distinguish authentic ancient molecules from modern contamination through molecular damage, blank controls and sequence authentication, but they cannot reconstruct the precise historical route by which an authentic molecule reached a wall.
This is not a consumer test. Removing material from a cave wall can damage irreplaceable heritage and can introduce modern DNA that compromises future work. Sampling should be performed only by qualified teams with legal permission, conservation oversight and appropriate ancient-DNA facilities.
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What the result changes for archaeology
The finding expands the kinds of archaeological surfaces that can preserve human genetic information. Researchers have long recovered ancient DNA from bones, teeth and sediments; cave walls now join that list, at least under some preservation conditions.
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Wall DNA could eventually complement other evidence about cave use, movement and population history. It may be especially useful where human remains are absent or where sediment layers have been disturbed. However, interpretation must keep the biological signal separate from the artwork’s authorship unless independent evidence links the two.
The study also shows why faunal DNA matters. Detecting animal DNA alongside human DNA can reveal that a sample reflects mixed sediment or water-borne material rather than a single person’s contact. Sensitive detection of both human and faunal sequences is therefore important when evaluating a supposed artist-associated signal.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What researchers say should happen next
The authors recommend systematic comparisons between pigment-bearing surfaces and adjacent unpigmented controls instead of testing painted areas in isolation. Larger studies could examine whether DNA recovery varies with pigment chemistry, calcite coatings, wall moisture, airflow, temperature or the age and style of the artwork.
They also call for more sensitive faunal-DNA detection and extraction protocols designed for cave-wall materials. Those improvements could help distinguish direct contact from sediment or water transfer and reveal whether some artistic techniques preserve DNA better than others.
Future work may produce stronger evidence if the same genetic signal repeatedly appears in pigment, is absent from nearby controls, and aligns with an independently dated occupation or painting event. Until then, cave-wall DNA should be treated as evidence of preserved biological material, not a genetic signature of a named artist.
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Common questions
Is this the first evidence of human DNA preserved on cave walls?
The first author, Alba Bossoms Mesa of the Max Planck Institute for Evolutionary Anthropology, described the result as “the first evidence for human DNA preservation on cave walls for thousands of years,” while stressing that the traces cannot be directly connected to creating the rock art. That statement refers to the study’s evidence and its limits.
Was every cave or painting positive?
No. Five of 54 samples were positive, and only one pigmented sample produced authentic ancient human mitochondrial DNA. Most tested material did not yield a reported human signal.
Does Western hunter-gatherer affinity prove who painted Covarón?
No. The affinity describes the population variation into which DNA from two unpigmented samples falls. It does not identify an individual or prove an art-making role.
Could modern visitors have caused the result?
The researchers used protective clothing and controlled sampling to reduce present-day contamination, and the reported molecular evidence was authenticated as ancient. That does not mean every historical transfer route is known; an authentic ancient molecule could still have arrived after the artwork was created.
Can visitors collect their own cave-wall DNA?
No. Unauthorised sampling can damage protected cultural heritage and contaminate material needed for scientific work. Ancient-DNA sampling requires permits, conservation approval and specialist laboratories.
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