Indigenous American Genome Reveals Complex History and Unique Diversity

In-Depth Analysis

### Background The peopling of the Americas represents the last major human expansion across the globe. However, the genetic history of Indigenous Americans has remained relatively unexplored. This new study addresses this gap by presenting a comprehensive genomic analysis of 199 individuals from North America to Patagonia.

### Key Findings

• **Genetic Diversity:** The study identified 1,426,511 new single-nucleotide variants (SNVs), demonstrating substantial genetic variation within Indigenous American populations. This underscores the need for broader inclusion in genomic resources to improve evolutionary and biomedical inferences.

• **Population Structure:** Principal component analysis (PCA) reveals clear genetic differentiation between North and South America, with substructure within regions. Genetic similarity mirrors geography, with four principal South American genetic clusters identified: Southern Cone, Eastern South America, Western South America, and Chaco.

• **Continental Dispersals:** The analysis supports at least three main dispersals into South America:
• The earliest dispersal includes individuals older than 9,000 years.
• A second dispersal occurred around 9,000 years ago, spreading through Central America into southern Mexico, Belize, Panama, and the Caribbean.
• A third dispersal, previously unrecognized, occurred approximately 1,300 years ago, with populations moving from Mesoamerica to South America and the Caribbean.

• **Australasian Affinity:** Some Indigenous American populations show elevated genetic affinity to present-day Australasians, suggesting admixture with an unsampled ancient Asian population (Ypykuéra).

• **Archaic Introgression:** The study confirms the presence of archaic hominid DNA (Neanderthals and Denisovans) in Indigenous American genomes. These introgressed variants contributed to adaptation to the American continent, particularly in genes related to immunity, metabolism, and epidermal integrity.

### Impact of Colonization European colonization caused a significant genetic bottleneck, reducing Indigenous populations by approximately 90%. Despite this, genetic continuity spanning more than 9,000 years is observed in some regions.

### Actionable Takeaways - The research highlights the importance of including diverse populations in genomic studies to gain a more complete understanding of human evolution and health. - The findings provide valuable insights into the genetic adaptations of Indigenous Americans to various environments, which can inform future biomedical research.

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Takeaways

• This study provides a comprehensive genomic analysis of Indigenous Americans, revealing a complex history shaped by multiple dispersals, genetic adaptations, and the impact of colonization. The findings underscore the importance of including diverse populations in genomic research to improve our understanding of human evolution and health.

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