Scientists are one step closer to pinpointing fragments of Leonardo da Vinci’s elusive DNA.
A team of researchers from the Leonardo da Vinci DNA Project analyzed samples swabbed from a red chalk drawing possibly attributed to the famed polymath, as well as letters written by one of his known cousins. Buried within that jumble of genetic material were human Y-chromosome sequences that belong to the same genetic grouping, sharing a common ancestry in Tuscany, the region where da Vinci was born. Specifically, they belong to the broad E1b1b lineage on the Y chromosome, which is passed from father to son.
The findings, presented this week in a preprint paper on the BioRxiv server, suggest that the DNA on the painting may belong to the storied Italian Renaissance man. If so, it would mark the first time scientists have identified his DNA.
Though the researchers caution that they can’t link the DNA to da Vinci with absolute certainty, the investigative process they describe shows how recent advances in modern genetics could reshape the way the art world thinks about authenticating works. A process currently accomplished by painstakingly poring over brushstrokes and making educated guesses could become more precise by looking for biological signatures like fingerprints left behind by an artist. On a more personal level, the findings mean researchers involved in this work are a step closer to finally identifying da Vinci’s DNA—a journey that began nearly a decade ago.
“Together, these data demonstrate the feasibility as well as limitations of combining metagenomics and human DNA marker analysis for cultural heritage science, providing a baseline workflow for future conservation science studies and hypothesis-driven investigations of provenance, authentication and handling history,” the team writes in their paper.
Paper lead author and University of Maryland and microbiologist Norberto Gonzalez-Juarbe, who has worked with the da Vinci DNA project for years, tells Popular Science that he initially started looking for the presence of microbes in art pieces and cultural artifacts for conservation purposes. Successful findings there led him and his colleagues to hypothesize that human biological signatures might also be embedded in those artifacts.
“Thus, we aimed to present a platform that could be used to study the multi-kingdom DNA present,” Gonzalez-Juarbe says.
Da Vinci’s lost DNA
Despite being one of the most widely known figures of the European Renaissance, da Vinci’s genetic history is shrouded in mystery. Researchers in Italy claim to have identified 14 living descendants of his direct relatives, but as far as historians can tell, da Vinci didn’t father any children of his own. Analyzing his own remains also isn’t possible because the church he was buried in fell into ruin following the French Revolution. Researchers have also thus far been denied access to his presumed tomb at The Château d’Amboise in Amboise, France.
That left science sleuths to search for trace signs of genetic material the painter may have left on his works. In this case, researchers turned to the chalk drawing titled “Holy Child,” which had been in the private collection of the late art dealer Fred Kline for the past 20 years. Gonzalez-Juarbe says he and his colleagues reached out to Kline about studying drawing before he died.
After some initial testing to determine the right extraction protocols, Gonzalez-Juarbe gently swabbed the drawing’s surface in April 2024 using a “minimally invasive” technique meant to collect biological signatures without damaging the work. That small swab, similar to the type so many people stick their nostrils for a COVID-19 test, collected hints of half millennia worth of history
Sorting through genomic history
Since paper is porous, it absorbs even faint traces of sweat and skin, both of which can carry whispers of DNA. But paper doesn’t discriminate among DNA sources. That’s why researchers can’t simply look for signs of da Vinci’s genetic material on the “Mona Lisa” or “The Last Supper.” In both cases, countless human hands have made contact with these works over the past 500 years, leaving behind a jumble of genetic signatures.
One of those human hands belonged to Kline. Luckily his wife remembered that he had previously sent a vial of his saliva to the personal genetics company 23andMe. Gonzalez-Juarbe and his colleagues were able to obtain that DNA sequence and effectively eliminate it from the list of possibilities. But that was just a drop in the genetic ocean. In reality, the vast majority of the DNA recovered from “Holy Child” wasn’t of human origin at all: around 99 percent came from bacteria, fungi, and plants.
Some of that nonhuman DNA proved useful. The researchers discovered that one of the sequences belonged to sweet orange trees (Citrus sinensis), which were known to be cultivated in Medici gardens in central Italy during da Vinci’s era. That clue told the geneticists that they were on the right track. The team also found signs of Plasmodium DNA. The single-celled parasite was endemic to the same region of Italy and was responsible for the death of several Medici family members. DNA fragments from plants and animals known to have been used in art shops at the time were also found.