Scientists have identified DNA that is around 200,000 years old at an open-air archaeological site in Germany, a place where experts once believed such genetic material could not survive. The find was made at the Schöningen site in Lower Saxony, which is famous for its prehistoric wooden spears and signs of early human activity. The age of the DNA is not the only thing that makes this discovery important. The place where it was kept is also important. It is easier to find ancient DNA in cold places like Siberian permafrost or deep caves, where the low temperatures slow down decay. However, this DNA survived in sediment exposed to changing climates over thousands of years. The study published in Nature Ecology & Evolution shows that under certain chemical conditions, genetic material can remain intact far longer than previously assumed. Researchers say this could expand the number of sites worldwide where ancient DNA might still be recovered.
200,000-year-old DNA found at Schöningen site in Germany
The discovery was made at the Schöningen archaeological site in Lower Saxony, Germany. The site is internationally recognised for the Schöningen spears, which are among the oldest known wooden hunting weapons and date back roughly 300,000 years.During excavations, scientists uncovered the fossilised remains of several horses buried in ancient lake sediments. According to the study published in Nature Ecology & Evolution by researchers from the University of Tübingen and collaborating institutions, the team extracted DNA from these remains that was approximately 200,000 years old.This makes it one of the oldest DNA samples ever found in a temperate, non-permafrost area.
DNA identified as extinct horse species
Genetic testing showed that the DNA came from a horse species that is no longer alive, called Equus mosbachensis. This species existed in the Middle Pleistocene epoch and is thought to be connected to subsequent horse lineages.Genomic comparisons indicate that this species diverged from other equine lineages approximately 800,000 to 900,000 years ago. The study helped scientists learn more about how ancient horses evolved and how different groups of them were connected across Eurasia.The peer-reviewed journal Nature Ecology & Evolution published the results, which included information about the sequencing process and the evolutionary comparisons made by the research team.
How did 200,000-year-old DNA survive without ice or caves
Most of the very old DNA discoveries that have been made so far have come from places that were frozen. For example, earlier record-holding ancient DNA samples were recovered from permafrost regions in Siberia, where cold temperatures slowed biological decay.The Schöningen discovery is different. The DNA lived on in sediments that were rich in carbonates and poor in oxygen. The researchers say that the lack of oxygen made the environment anaerobic, which slowed down the activity of microbes. The sediments that were rich in minerals may have helped hold the DNA fragments together and protect them.The study says that the burial environment’s chemical stability was very important for preservation. This contradicts the long-held belief that ancient DNA exceeding 100,000 years cannot endure in temperate outdoor environments.
Why this discovery changes ancient DNA research
This discovery may expand the parameters of forthcoming genetic research. If DNA can last for 200,000 years in these kinds of places, other archaeological sites with similar conditions might also have preserved genetic material.According to the authors in Nature Ecology & Evolution, this opens new opportunities for studying extinct species and ecosystems from the Middle Pleistocene period. It also lets scientists look at evolutionary relationships more closely by using genetic evidence instead of just looking at the shapes and structures of fossils.The finding means that scientists might not need frozen ground to find DNA that is very old. Nature can keep genetic material in strange places if the right chemicals are present.As more research is done at Schöningen and similar sites, new discoveries could change what we know about how long DNA can last and where scientists should look for it next.