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Studies of three Amerindian populations using nuclear DNA polymorphisms
J R Kidd1, F L Black, K M Weiss
1Department of Human Genetics, Yale University School of Medicine, New Haven, CT 06510.
Human Biology
|December 1, 1991
Summary
Genetic diversity in Amerindian populations was assessed using nuclear restriction fragment length polymorphisms (RFLPs). Despite reduced heterozygosity compared to Europeans, genetic diversity suggests no severe population bottlenecks occurred.
Area of Science:
- Population Genetics
- Human Evolution
- Molecular Anthropology
Background:
- Understanding genetic diversity in indigenous populations is crucial for evolutionary studies.
- Amerindian populations represent unique genetic lineages with distinct evolutionary histories.
Purpose of the Study:
- To quantify genetic diversity in three Amerindian populations using nuclear DNA markers.
- To compare heterozygosity levels with European populations and infer demographic history.
Main Methods:
- Typing of up to 30 nuclear restriction fragment length polymorphisms (RFLPs).
- Comparison of observed and expected heterozygosities between Amerindian and European groups.
Main Results:
- Reduced average heterozygosity observed in Amerindian populations (Mayan: 7.0% reduction; Karitiana: 27.1% reduction) compared to Europeans.
- Despite reductions, nuclear DNA heterozygosity remains sufficiently high.
Conclusions:
- The observed heterozygosity levels in Karitiana, Rondônia Suruí, and Mayan populations suggest that severe or prolonged population bottlenecks are unlikely.
- Genetic diversity patterns are consistent with the peopling of the Americas and subsequent population dynamics.