2023 Author: Bryan Walter | [email protected]. Last modified: 2023-05-21 22:24
Paleogeneticists analyzed sediment samples from the Georgian cave of Satsurbia and found ancient DNA fragments of a wolf, a bison, as well as a person who lived about 25 thousand years ago. It belongs to the ancient Caucasian genetic line, which is known from individuals from the nearby Dzudzuana Cave, which contributed to subsequent populations in Europe, the Middle East and North Africa. The article was published in the journal Current Biology.
Ancient DNA isolated from bones, teeth and hair has revolutionized the understanding of the human past. Paleogenetics have advanced even further in recent years and have learned how to find DNA in cave sediments. This is especially important when there are no bone remains in the parking lot. At the same time, this method makes it possible to assess the sequence of colonization of the same cave by different types of people at different times. Recently, similar studies made it possible to establish that the Denisovans came to Altai more than 200 thousand years ago, ahead of the Neanderthals, who made at least two waves of migration from east to west.
There are a large number of Paleolithic sites on the territory of Georgia, and they go back to ancient times. Even before the ancestors of modern humans and Neanderthals, about 1.8 million years ago, this area was inhabited by Homo erectus, known primarily due to the site in Dmanisi. One of the late Upper Paleolithic sites in the Satsurblia Cave is located in the west of Georgia. During excavations in this cave, the right temporal bone of a person was discovered, dating back to 13, 1–13, 4 thousand years ago. Recently, geneticists have established that he belonged to a group of Caucasian hunter-gatherers, which subsequently had a significant impact on many Eurasian populations, including representatives of the Yamnaya archaeological culture.
Location of sites mentioned in the study
Pere Gelabert from the University of Vienna, together with scientists from the UK, Denmark, Ireland, Georgia, Israel, Portugal and Germany, isolated and analyzed DNA from six sediment samples taken at the Upper Paleolithic Satsurbia site, dating from the last glacial maximum (about 25 thousand years back). Scientists noted that karst cave systems in most of the Caucasus are characterized by low and stable year-round temperatures and low acidity, which allows ancient specimens to survive.
The analyzed samples contained a sufficient number of DNA fragments. Scientists have found DNA from humans (Homo sapiens), wolves (Canis lupus) and bison (Bison bonasus), and they suggest that each species is likely represented by several individuals. Apparently, fragments of the human genome belonged to a woman (or several women). DNA research of wolves has shown that they are basal to existing Eurasian wolves and dogs and represent a previously unknown, probably extinct Caucasian lineage. Bison also proved to be basal in relation to modern populations.
The researchers compared the isolated human genome from the Satsurblia site with data obtained from the remains from the nearby Dzudzuana cave, obtaining evidence of their genetic relationship. This confirms that the DNA fragments are ancient.
Past research has identified two distinct ancient human lineages in the Caucasus that were distinct from the rest of the Pleistocene and Early Holocene diversity. The genomes of the Upper Paleolithic era (about 13, 3 thousand years ago) from the Satsurblia cave and the Mesolithic (9, 7 thousand years ago) from the neighboring grotto Kotias Klde showed that they belong to the ancestors of the Caucasian hunter-gatherers, who separated from the western populations about 45 thousand years back. The second line is more ancient and is represented by data on two individuals from the Dzudzuana cave who lived about 26 thousand years ago. She contributed to subsequent populations in Europe, the Middle East and North Africa.
Earlier, at N + 1, they talked about other paleogenetic studies on the populations of hunter-gatherers in Eurasia during the Upper Paleolithic. So, scientists found out that the last ice age destroyed the population of people in Northeast Asia, and before the last glaciation, genetically diverse Cro-Magnons settled in Europe. You can learn more about genetic research in the material “The Human Genome: Twenty Years Later”.
