Basal Eurasians Stayed Behind to Erase Neanderthal DNA

The story of the Basal Eurasians describes a "ghost population"—a lineage of ancient humans known through DNA analysis rather than physical fossils. This group is a fundamental pillar of human history, representing a branch of Homo sapiens that shaped the genetic makeup of billions today.

Here is a summary of the key findings regarding this lineage:

1. The "Ghost" Origins
Basal Eurasians split from the primary "Out of Africa" migration roughly 60,000 to 100,000 years ago. While the rest of the migrating humans (the "Hub" or "Common Eurasians") moved into the Persian Plateau and Central Asia, the Basal Eurasians remained isolated in "refugia"—likely the Arabian Peninsula or North Africa.

2. The Neanderthal Paradox
The most defining trait of Basal Eurasians is their lack of Neanderthal DNA.

The Isolation: Because they stayed south while other groups moved north into Neanderthal territory, they never interbred with them.

The Dilution Hypothesis: This explains why modern Europeans and Middle Easterners have less Neanderthal DNA than East Asians. When Basal Eurasians later mixed with other groups, they "diluted" the Neanderthal genetic percentage (like adding water to a sugary drink).

3. Impact on the Neolithic Revolution
For tens of thousands of years, this group lived in parallel to the rest of the world. However, as the Ice Age ended, they reunited and mixed with other lineages. This merger created the genetic foundation for the world's first farmers:

The Natufians, Ancient Levant hunter-gatherers, were nearly 50% Basal Eurasian.

Early Farmers: This DNA was carried by Neolithic farmers from Iran and Anatolia as they migrated into Europe and South Asia, spreading the genetic signature of this "ghost" population across continents.

4. Modern Genetic Legacy
Though no "pure" Basal Eurasian skeleton has been found, their "genetic shadow" is immense. Their influence follows a clear gradient today:

Highest: Modern Arabian populations (e.g., Bedouins and Yemenis) at ~45%.

Moderate: Southern Europeans (e.g., Sardinians) at ~20–25%.

Lowest: East Asian populations (e.g., Han Chinese) at ~0%, as their ancestors remained geographically separated from the Basal lineage.