Researchers have identified ancient microbes within the remains of Ötzi the Iceman, a mummy discovered in a glacier in the Alps in 1991. The study, published in the journal Microbiome, indicates that these microorganisms may have survived for over 5,300 years. Ötzi's remains date back to 3300 B.C., predating significant historical landmarks such as Stonehenge and the Egyptian pyramids. Initially thought to have died from exposure or exhaustion, later examinations revealed an arrowhead lodged in his shoulder, suggesting he bled to death.
Experts from Eurac Research found that Ötzi's remains contain a diverse community of ancient and modern microorganisms, providing insights into the microbial history of early humans. During their analysis at the South Tyrol Museum of Archaeology in Bolzano, Italy, researchers discovered cold-adapted yeasts and genetic material from Ötzi's gut microbiome. They distinguished between microorganisms present during Ötzi's life and those that colonized his body post-mortem using tissue samples and genetic analysis.
The study revealed the presence of cold-adapted yeast species likely from the glacial environment, which have persisted on Ötzi's body. The unique composition of Ötzi's microbiome includes gut bacteria not typically found in modern humans. Researchers noted that some microbes may still exist in a dormant state after thousands of years. Elisabeth Vallazza, director of the South Tyrol Museum of Archaeology, stated that the mummy's preservation condition is stable, and ongoing microbiological monitoring is essential to prevent damage.
Despite these findings, questions remain regarding how microorganisms survive and interact within Ötzi's frozen remains. Conservation expert Marco Samadelli remarked that the mechanisms are not fully understood, while Frank Maixner, director of the Institute for Mummy Studies at Eurac Research, emphasized the continuous presence of certain microorganisms on the mummy throughout its history. The findings contribute to a growing body of research on ancient remains and their microbial ecosystems.