Ancient DNA reveals Ice Age Europe's genetic connections
A 30,000-year-old woman from southwestern France carried ancestry linking western and central European populations, showing far-reaching Ice Age gene flow.
Ancient DNA from a 30,000-year-old woman has revealed that Ice Age Europeans were far more genetically connected than previously believed. The study, published on October 23, 2026 in Science Advances, presents the oldest genome-wide genetic dataset from a modern human in southwestern Europe, showing complex ancestry and gene flow.
The woman lived about 30,000 years ago. Her remains were found at Isturitz Cave in what is now southwestern France. Her genetic background was mostly western European but also included a statistically strong ancestry component linked to central and eastern European populations. This demonstrates that eastern and western European populations were not genetically isolated during the Gravettian period. Senior author Ron Pinhasi led the international team of about 40 co-authors. The Isturitz sample itself yielded more than 454,000 variable positions in its genome.
Genetic mixing reshapes Ice Age Europe
Genetic modeling dates the mixing of these ancestries to roughly 32,500 to 31,500 years ago. This admixture pulse challenges earlier assumptions of population isolation. The Gravettian culture, to which these individuals belonged, flourished across Europe from roughly 34,000 to 25,000 years ago.
A similar genetic signal was found in a previously studied individual from Ormesson, near Paris. However, the admixture timing estimate for the Ormesson genome did not reach statistical significance, though its range overlapped with that of Isturitz. The clearest result therefore rests heavily on the Isturitz woman. The research team calls the gene flow the source of her eastern ancestry, though this interpretation is disputed. A separate dental study had proposed a population turnover around 28,000 years ago, which the genetic team describes as contradicting their findings.
The study also analyzed other Gravettian-era individuals. Ostuni1b, a male fetus from southern Italy, was the son of Ostuni1. Genetic analysis indicated the father belonged to the same population as the mother, suggesting mating patterns that limited inbreeding. This pair belongs to the Věstonice cluster, a central European and Italian genetic group identified in earlier studies.
Sediment DNA reveals hidden human history
Where human bones are absent, cave sediments are now filling gaps. Researchers extracted human nuclear DNA from a sediment layer dated to about 22,000 years ago at El Mirón Cave in Cantabria, Spain, where no human bones or teeth were found. This sample contained over 14,737 human genetic markers matching a western lineage.
This sedimentary DNA evidence supports the idea that western European ancestry persisted in the Iberian Peninsula through the Last Glacial Maximum, which occurred between roughly 26,000 and 19,000 years ago. Iberia likely served as a refuge where people survived the coldest conditions before later resettling northern Europe. The method highlights a new frontier. Cave sediment from sites worldwide may hold human DNA even where bones are absent.
Limitations and future directions
The findings rely on limited samples. The study sequenced just three individuals, and DNA has been recovered from only about two dozen Gravettian skeletons overall. The East-West conclusion rests heavily on the Isturitz woman and the Ormesson individual. Furthermore, the mixing date assumes a single pulse of gene flow; an older eastern component already present in the west cannot be ruled out.
Other genomic data remains scarce. No Aurignacian genome has been recovered from southwestern Europe. A comparison using the Kostenki 14 genome from Russia was nonsignificant. The study also recovered human DNA from a degraded tooth at Chufín Cave in northern Spain, from an adult woman who lived about 26,000 years ago, but it produced far fewer usable genetic markers.
Future steps will involve sampling more sediment layers and targeting Gravettian sites where skeletons have never been found. This work aims to expand the picture of prehistoric population movements built from both bones and the dirt that surrounds them.
