BY THE ARCHAEOLOGIST EDITOR GROUP

Detailed paleogenetic research sheds light on Southern Arc migration, farming, and language evolution.

In a trio of papers, published simultaneously in the journal Science, Ron Pinhasi from the Department of Evolutionary Anthropology and Human Evolution and Archaeological Sciences (HEAS) at the University of Vienna and Songül Alpaslan-Roodenberg from the University of Vienna and Harvard University, Iosif Lazaridis and David Reich at Harvard University—together with 202 co-authors—report a massive effort of genome-wide sequencing from 727 distinct ancient individuals with which it was possible to test longstanding archaeological, genetic and linguistic hypotheses. They present a systematic picture of the interlinked histories of peoples across the Southern Arc Region from the origins of agriculture, to late medieval times.

The first article by the international team looked at the origins and dissemination of Indo-European and Anatolian languages. The Indo-Anatolian language family's ancestral home is thought to have been in West Asia, according to genetic evidence, with secondary dispersals of non-Anatolian Indo-Europeans from the Eurasian steppe. People with Caucasian origin came into Anatolia in the west and the steppe in the north during the first stage, which took place between 7,000 and 5,000 years ago. These people may have spoken Anatolian and Indo-European languages in their ancestry.

Around 5,000 years ago, Yamnaya steppe herders with Caucasus hunter-gatherer and Eastern hunter-gatherer heritage set off a series of migrations across Eurasia that may be traced to all currently spoken Indo-European languages (such as Greek, Armenian, and Sanskrit). Their southern excursions into the Balkans and Greece, as well as their eastern expansions across the Caucasus into Armenia, left a mark on the region's Bronze Age inhabitants.

The Yamnaya herders' descendants mixed differently with the local people as they grew. Several types of genetic evidence can be used to pinpoint how Indo-European-speaking immigrants from the steppe interacted with locals to create the Greek, Paleo-Balkan, and Albanian (Indo-European) languages in Southeastern Europe and the Armenian language in West Asia. The Yamnaya had a significant influence on Southeastern Europe, as individuals with nearly pure Yamnaya heritage arrived shortly after the Yamnaya migrations began.

The Southern Arc's Anatolia core region, where large-scale data offers a rich picture of change—and lack of change—over time, yields some of the most startling findings. According to the findings, Anatolia was not significantly affected by the Yamnaya migrations, in contrast to the Balkans and the Caucasus. Due to the absence of Eastern hunter-gatherer ancestors in Anatolia, in contrast to all other places where Indo-European languages were spoken, no connection to the steppe can be established for speakers of Anatolian languages (such as Hittite and Luwian).

The southern Caucasus was impacted numerous times, even before the Yamnaya migrations, in contrast to Anatolia's startling impermeability to steppe migrations. "I was surprised to learn that the Areni Chalcolithic people, who were discovered 15 years ago in the excavation I co-led, had ancestry from gene flow from the north to areas of the southern Caucasus more than 1,000 years before the Yamnaya expanded, and that this northern influence would disappear in the area before reappearing a few thousand years later. This demonstrates that there is still a lot of information to be learned through new digs and fieldwork in Eastern Western Asia "Ron Pinhasi says.

"Anatolia was home to varied communities descending from both local hunter-gatherers and eastern populations of the Caucasus, Mesopotamia, and the Levant," states Songül Alpaslan-Roodenberg

"Variations of the same types of ancestry were shared by the inhabitants of the Marmara region, Southeastern Anatolia, the Black Sea, and the Aegean regions."

The interconnections of the first farming societies

The second research project investigates the origins of the world's oldest Neolithic populations, which date to around 12,000 years ago. "The genetic findings support the idea that early farming groups had a network of pan-regional relationships. In addition, they offer fresh proof that the Neolithic transition was a difficult process that took place not just in one central region but also in Anatolia and the Near East, "Ron Pinhasi said.

It gives the first ancient DNA data for Pre-Pottery Neolithic farmers from the Tigris side of northern Mesopotamia, which is a critical region for the origins of agriculture and can be found in both eastern Turkey and northern Iraq. The island of Cyprus, which saw the earliest maritime migration of farmers from the eastern Mediterranean, also contains the first ancient DNA from Pre-Pottery farmers. Together with the first information from Neolithic Armenia, it also offers fresh information on early Neolithic farmers from the Northwest Zagros.

By filling in these gaps, the authors were able to examine the genetic history of these societies, for which archaeological research had previously documented intricate economic and cultural interactions but was unable to track mating practices or interactions that did not leave visible material traces. The findings demonstrate pre-Neolithic roots from hunter-gatherers in the Caucasus, Levant, and Anatolia, and they demonstrate that these early farming cultures created a continuity of lineage that mirrored the topography of West Asia. The findings also show at least two waves of migration from the Fertile Crescent's core to Anatolia's ancient farmers.

The historic period

The third piece demonstrates how ancient Mediterranean political systems maintained differences in lineage from the Bronze Age while remaining connected by migration. The findings indicate that while Italians before the Imperial period had a totally diverse distribution, the ancestry of those who resided in and around Rome during the Imperial period was nearly identical to that of Roman and Byzantine inhabitants from Anatolia. This shows that the heterogeneous but comparable population of the Roman Empire, both in its longer-lasting eastern component focused on Anatolia and in its shorter-lasting western part, was plausible drawn to a significant extent from Anatolian pre-Imperial sources.

"Our findings are rather unexpected considering that in a Science study I co-authored in 2019 on the genetic heritage of people from Ancient Rome, we discovered a cosmopolitan pattern that we initially believed to be specific to Rome. Now that we can see it, other parts of the Roman Empire were just as multicultural as Rome itself, "Ron Pinhasi argues.