For thousands of years, the southern reaches of South America have held secrets about humanity’s past. Now, a groundbreaking study has revealed traces of a previously unknown lineage of people whose genetic legacy has persisted in Argentina for at least 8,000 years.
A Hidden Chapter in Human History
Archaeologists have long debated when humans first arrived in South America’s southernmost regions, with evidence pointing to around 14,000 years ago. Yet, until recently, little was known about the genetic makeup of these early populations. The new research, led by Harvard University evolutionary biologist Javier Maravall López, analyzed DNA from 238 ancient individuals spanning 10 millennia. This effort expanded the available genetic data from the region more than tenfold.
Discovery of a Lost Lineage
The study uncovered a previously unknown human lineage in central Argentina. The earliest representative lived around 8,500 years ago, and by 4,600–150 years ago, most individuals in the DNA records belonged to this group. Remarkably, despite coexisting with other distinct genetic lineages, these people showed little evidence of inter-regional mixing. Instead, they developed unique cultures and languages while remaining biologically isolated.
“We found this new lineage, a new group of people we didn’t know about before, that has persisted as the main ancestry component for at least the last 8,000 years up to the present day,” said Maravall López.
Cultural Diversity, Genetic Continuity
Argentina is known for its rich diversity of languages and cultures. Yet, the DNA evidence suggests that beneath this cultural variety lay a consistent and homogenous ancestry. This paradox highlights how isolated communities could flourish culturally while maintaining genetic continuity across millennia.
Why This Matters
According to Harvard geneticist David Reich, the expanded DNA dataset will allow researchers to build refined maps of population size changes and migration patterns, similar to those already available for Europe. Such maps are transformative, offering insights into how ancient people lived, moved, and interacted—information that was previously inaccessible.
Conclusion
This discovery reshapes our understanding of South America’s human history. The genetic “ghosts” of this long-lost people remind us that the continent’s past is far richer and more complex than previously imagined. As DNA technology advances, more hidden chapters of humanity’s story are likely to be revealed.
Source: ScienceAlert – Genetic ‘Ghosts’ of a Long-Lost People Found in South America
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