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Population structure in Argentina.

Marina Muzzio1,2, Josefina M B Motti3, Paula B Paz Sepulveda1

  • 1Instituto Multidisciplinario de Biología Celular (IMBICE) CCT-La Plata CONICET-CICPBA, La Plata, Buenos Aires, Argentina.

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Summary
This summary is machine-generated.

Argentinian population genetics reveal distinct European, African, and Native American ancestry patterns. Geographic distance from Buenos Aires correlates with higher Native American ancestry, particularly in northern regions.

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Area of Science:

  • Population Genetics
  • Human Ancestry Analysis
  • Genomic Diversity

Background:

  • Understanding Argentinian population structure is crucial for historical and demographic insights.
  • Previous studies have hinted at complex admixture patterns, but detailed regional analysis is lacking.

Purpose of the Study:

  • To investigate the genetic ancestry proportions and patterns across 12 Argentinian populations.
  • To explore correlations between geographic location, historical migration routes, and genetic makeup.
  • To identify the specific origins of European, African, and Native American ancestral components.

Main Methods:

  • Genomic analysis of 391 samples from Argentinian populations using the Illumina Human Exome Beadchip.
  • Principal Components Analysis (PCA) to infer populational divergence and migration patterns.
  • Quantification of European, African, and Native American ancestry proportions.

Main Results:

  • Identified significant European, African, and Native American ancestry components across Argentina.
  • Found a correlation between distance from Buenos Aires and increased Native American ancestry, highest in the north.
  • Detected two distinct Native American ancestral components: one widespread, another specifically Andean.
  • Observed highest African ancestry percentages in the Center-West, linked to historical slave trade routes.
  • African ancestry sources include West Africa and Bantu-influenced groups, with the latter being slightly more prevalent.

Conclusions:

  • Argentinian population structure reflects complex admixture influenced by geography and historical migration.
  • The genetic landscape shows distinct regional patterns of Native American and African ancestry.
  • Ancestral African origins in Argentina differ from North America, aligning with Southern Hemisphere maritime history.