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The HLA loci of th Hopi and Navajo
Insights
Genetic analysis reveals similar HLA antigen distributions in Hopi and Navajo populations, suggesting cultural evolution outpaced genetic divergence over 20,000 years.
Area of Science:
- Population genetics
- Human genetics
- Immunogenetics
Background:
- The Hopi and Navajo tribes exhibit significant cultural diversity.
- Understanding the genetic landscape of indigenous populations is crucial for anthropological and medical research.
Purpose of the Study:
- To determine the genetic distribution of human leukocyte antigen (HLA) loci A, B, C, and DR in Hopi and Navajo populations.
- To compare the genetic profiles of these two distinct Native American tribes.
Main Methods:
- A cohort of 100 out-patients from each tribe was selected from the Public Health Service Indian Hospital in Keam's Canyon, Arizona.
- High-resolution typing was performed for antigens at the HLA-A, B, C, and DR loci.
- A genetic distance measure (f) was calculated to assess population similarity.
Main Results:
- The allele and haplotype distributions at the studied HLA loci were found to be similar between the Hopi and Navajo tribes.
- The genetic distance analysis confirmed a close genetic relationship between the two populations.
- Despite genetic similarities, significant cultural differences exist between the Hopi and Navajo.
Conclusions:
- The genetic makeup of the Hopi and Navajo, particularly at major histocompatibility loci, shows a high degree of similarity.
- The pronounced cultural divergence between these tribes likely stems from cultural evolution and diversification, which has occurred at a much faster rate than genetic evolution over the last 20,000 years.
Abstract:
The purpose of this paper is to present the genetic distribution at the HLA-A, B, C, and DR loci in the Hopi and the Navajo. A sample of 100 out-patients from each tribe was selected at the Public Health Service Indian Hospital in Keam's Canyon, Arizona, and was typed for the antigens at the four loci. The distributions of the alleles and the haplotypes are similar in each tribe. A distance measure, f, confirms the genetic similarity of the two populations. It is concluded that the great cultural diversity of the Hopi and the Navajo is the result of a cultural evolution and diversification that has greatly outstripped the genetic evolution at the major histocompatibility loci over the past 20,000 years.