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Protein polymorphism in three South Amerindian populations
D M Clariá1, D A Demarchi, R Moreno Azorero
1Universidad Nacional de Córdoba, Argentina.
Annals of Human Biology
|November 18, 1998
Summary
Genetic analysis of South American native populations reveals significant blood protein polymorphism. The Macá population exhibits high diversity, potentially due to admixture, while genetic distances among groups suggest natural selection
Area of Science:
- Human genetics
- Population genetics
- Biochemistry
Background:
- Native South American populations exhibit genetic diversity.
- Electrophoretic analysis of blood proteins is a key tool in population genetics.
- Understanding genetic variation aids in tracing population history and evolutionary forces.
Purpose of the Study:
- To analyze electrophoretic polymorphism in blood red cells and plasma proteins.
- To compare genetic variation among three distinct South American native populations: Mataco, Macá, and Guayaki.
- To investigate potential factors influencing observed genetic diversity, such as admixture and natural selection.
Main Methods:
- Electrophoretic analysis of blood red cell and plasma protein loci.
- Calculation of mean heterozygosity per locus.
- Computation of Nei's genetic distances.
- Analysis of F(ST) values among populations.
Main Results:
- Mean heterozygosity per locus ranged from 0.024 to 0.073.
- The Macá population showed the highest polymorphism, suggesting possible admixture with Caucasoid populations.
- Despite phenotypic and ethno-linguistic differences, genetic distances between Guayaki and Chaco tribes (Mataco, Macá) were minimal.
- Heterogeneity in F(ST) values across polymorphic loci indicates potential action of natural selection.
Conclusions:
- The Macá population's high genetic diversity may be attributed to admixture.
- Low genetic distances suggest a shared genetic heritage or recent divergence among the studied populations.
- Observed patterns of genetic variation, particularly the heterogeneity of F(ST) values, point towards the influence of natural selection in shaping the genetic landscape of these South American native groups.