What does new ancient DNA reveal about early European migration?

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New Ancient DNA Reveals Previously Unknown Migration into Europe and Intermixing with Neanderthals

Genetic sequencing of human remains dating back 45,000 years has unveiled a previously unrecognised migration into Europe, revealing that these early modern humans were more closely related to present-day populations in East Asia and the Americas than to contemporary European groups. This research, based on analysis of ancient remains found in Bulgaria's Bacho Kiro cave, indicates a more complex picture of early human settlement than previously understood, suggesting potential population replacements within Europe.
Discovery of an Unknown Migration Route

The analysis of human remains, including a tooth and bone fragments from the Bacho Kiro cave in Bulgaria, has provided definitive evidence of a modern human migration into Europe that was not previously identified in the genetic record. These individuals, existing around 45,000 years ago, exhibited genetic links predominantly to populations in East Asia and the Americas, challenging prior assumptions about the origins and connections of the earliest modern humans in Europe.
Evidence of Continuity and Replacement

This new genetic data offers evidence of continuity between the earliest modern humans in Europe and later populations across Eurasia. However, the findings also suggest that the early human history in Europe may have been characterised by population replacements, where earlier groups were superseded by subsequent arrivals. This implies that the narrative of early European settlement is not a simple linear progression but involved dynamic shifts and potential displacement of established populations.
Increased Frequency of Neanderthal Admixture

The genetic analysis of the Bacho Kiro cave individuals also revealed that intermixing between modern humans and Neanderthals during this period was more common than previously assumed. All individuals studied from the cave possessed Neanderthal ancestors within five to seven generations prior to their existence, indicating that admixture between these early humans and Neanderthals was a frequent occurrence. This contrasts with earlier findings, such as the Oase 1 individual from Romania, which suggested such mixing might have been an isolated event.
A Separate Ancient Skull's Genetic Isolation

Concurrent research on a skull discovered in the Zlaty kun area of the Czech Republic, also dated to at least 45,000 years old, yielded different genetic insights. Unlike the Bacho Kiro individuals, the Zlaty kun skull does not share discernible genetic links with either modern Asian or European populations. This genetic distinctiveness, alongside the presence of longer Neanderthal DNA blocks compared to other ancient individuals, suggests a complex mosaic of early human populations in Eurasia, each with unique ancestral connections and migration histories.

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