Largest Indigenous American Genomic Study Reveals Three Migration Waves
Researchers identify over a million new genetic variants, filling a critical gap in global health equity and human evolutionary history.
An international research team has published the largest genomic database of Indigenous Americans to date, uncovering a complex settlement history and millions of previously unknown genetic markers. The study, led by Tábita Hünemeier of Pompeu Fabra University and the Institute of Evolutionary Biology (IBE) and published in the journal Nature, provides a new blueprint for understanding human diversity in the Americas.
The team analyzed 199 contemporary Indigenous genomes, including 128 newly sequenced high-coverage genomes. These samples spanned 53 populations and 31 linguistic families across eight Latin American countries: Argentina, Bolivia, Brazil, Colombia, Ecuador, Mexico, Paraguay, and Peru. This effort resulted in the discovery of over 1 million genetic variants that were entirely absent from existing international genomic databases.
A Complex Settlement History
The genomic data rewrites the timeline of how the Americas were populated, identifying three distinct migratory waves. The first occurred approximately 15,000 years ago, followed by a second wave roughly 9,000 years ago. A third, more recent migration took place about 1,300 years ago, moving from Mesoamerica into South America and the Caribbean.
Additionally, the research found that approximately 2% of the genome in some Indigenous American groups shows a genetic affinity with populations in Australasia. Researchers attribute this link to an ancient, unsampled Asian population known as Ypykuéra (Y-lineage). Despite the massive impact of colonization, which Hünemeier notes decimated Indigenous populations by 90%, the study found genetic continuity spanning more than 9,000 years in certain regions.
Closing the Genomic Gap
This research addresses a systemic bias in human genomics, which has historically focused on populations of European origin. This underrepresentation has created significant inequities in biomedical research, as genetic ancestry can fundamentally alter how individuals respond to specific drugs or their risk factors for certain diseases.
By filling this "genomic gap," the study moves the industry toward more inclusive personalized medicine. Hünemeier emphasizes that understanding this diversity is not just a matter of historical record but a clinical necessity, stating that from drug design to disease prevention, these insights benefit both Indigenous communities and the global population.
Future Implications
As this database becomes a resource for the wider scientific community, the focus will shift toward applying these variants to clinical settings to ensure Indigenous populations are not excluded from modern biomedical advancements. Researchers will continue to investigate the Ypykuéra lineage and the specific drivers of the three migratory waves to further refine the map of human migration.