Researchers find early humans evolved from multiple intermingling African populations
Updated
Updated · ScienceDaily · Apr 26
Researchers find early humans evolved from multiple intermingling African populations
11 articles · Updated · ScienceDaily · Apr 26
A new genetic study led by UC Davis and McGill University analyzed 44 newly sequenced Nama genomes, revealing early human populations exchanged genes for hundreds of thousands of years before diverging 120,000–135,000 years ago.
This network-like model challenges the single-origin theory, suggesting modern human diversity arose from interconnected ancestral groups rather than a single population or archaic hominin contributions.
Recent studies further highlight deep African genomic diversity and long-term population continuity, emphasizing that human origins involved widespread movement and mixing across Africa rather than a single evolutionary event.
What can the DNA of a single indigenous group reveal about the origin of all humanity?
Could a mystery human species be the source of up to 20% of our modern DNA?
How does Africa's network of ancient populations rewrite the first chapter of human history?
Does ancient 'ghost' DNA in our genes hold the key to curing modern diseases?
If our origins are a 'braided river,' what lost ancestral streams have we just discovered?
Challenging the Single-Origin Model: How Gene Flow and Superarchaic Introgression Redefined Human Ancestry
Overview
In 2026, genomic analyses of diverse African and Eurasian populations led to the groundbreaking "weakly structured stem" model, revealing that early Homo sapiens formed interconnected groups with continuous gene flow rather than isolated branches. This model identifies a key population split around 120,000 years ago and explains modern human genetic diversity without invoking archaic admixture. Additionally, deep interbreeding with ancient superarchaic populations in Africa and Eurasia shaped our genetic mosaic. Complex interactions with Neanderthals involved multiple waves of interbreeding, often with sex-biased gene flow. Together, these findings reshape human evolution as a dynamic network of populations adapting through gene flow, challenging simple linear ancestry and highlighting ongoing natural selection even in recent millennia.