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African population hub explains ancient East Asian lineages in Europe

Ancient human remains unearthed in the Bacho Kiro cave, Bulgaria, and recently genetically described were surprisingly reported to be more closely related to contemporary East Asians than contemporary Europeans. Several scenarios were proposed to account for the finding, but this result so far raised more questions than answers concerning the underlying ancient population movements that could explain the presence of genetically East Asian individuals in Europe around 45,000 BP. An African population hub could explain the results.

The study “Genetics and material culture support repeated expansions into Paleolithic Eurasia from a population hub out of Africa,” published in Genome Biology and Evolution attempted to solve this mystery, by putting those individuals in the wider context of Eurasian Palaeolithic human genomes and co-analyzing genetics and archaeological evidence.

African population hub
Schematic representation of the peopling of Eurasia through repeated waves of expansion from an out of Africa population Hub (grey-shaded area, precise location is not known); the red arrows represent the expansion associated with Initial Upper Paleolithic material culture and the blue arrows the expansion associated with Upper Paleolithic assemblages. Kya= kylo years ago. Image courtesy of Leonardo Vallini, Giulia Marciani.

In the scenario put forward by the authors, the colonization of East and West Eurasia was characterized by several events of expansion and local extinction from a population hub, where the ancestors of all Eurasians thrived after they first ventured out of Africa ~70-60 thousand years BP.

Failed Homo sapiens expansion

An early, failed Homo sapiens expansion took place sometime earlier than 45 thousand BP. The only representative of that migration, which is related to neither modern Europeans nor modern Asians, has been recovered from Zlatý kůň, Czech Republic, and it is yet unclear how widespread it was.

“Then, around 45 kya, a new expansion emanated from the hub and colonized a wide area spanning from Europe to East Asia and Oceania and is associated with a mode of producing stone tools known as Initial Upper Paleolithic,” said Leonardo Vallini, the first author of the study.

The fate of these settlers was different in East Asia and in Europe: while in the former they endured and ultimately led to the formation of the modern populations of East Asia, the European representatives of this expansion declined and largely disappeared, leaving the Bacho Kiro, the elusive Oase individual from Romania, and a few other remains as the only witness of this early peopling of Europe.

Neanderthals extinct around the same time

“It is curious to note that, around the same time, also the last Neanderthals went extinct,” said Giulia Marciani, from the University of Bologna and co-author of the study.

“Finally, one last expansion occurred sometime earlier than 38 kya and re-colonized Europe from the same population hub, whose location is yet to be clarified,” said Luca Pagani, senior author of the study. “Although even in Europe there were occasional interactions with survivors of the previous wave, an extensive and generalized admixture between the two waves only took place in Siberia where it gave rise to a peculiar ancestry known as Ancestral North Eurasian, which eventually contributed to the ancestry of Native Americans.”

This migration is associated with a different cultural assembly named Upper Paleolithic, which characterizes the main European Paleolithic sites.

African population hub is comprehensive scenario

“It is noteworthy that, from a cultural perspective, these novel stone tools have often been depicted as an independent assembly rather than a local development of pre-existing technologies in Europe. It is refreshing to see that genetic and cultural information can be reconciled under a comprehensive scenario,” said Telmo Pievani, from the University of Padova and co-author of the study.

The authors conclude that further efforts should be directed into clarifying the geographic whereabouts of the hub, and identifying both the internal and external causes underlying these ancient population movements, as well as the associated cultural dynamics.

The study was led by Leonardo Vallini and by Prof. Luca Pagani, from the University of Padova in collaboration with Dr. Giulia Marciani and Prof. Stefano Benazzi from the University of Bologna, Italy.

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