HLA Genes in Mayos Population from Northeast Mexico

Area of Science:

• Population Genetics
• Immunogenetics
• Anthropology

Background:

• The Human Leukocyte Antigen (HLA) system plays a critical role in immune response and is highly polymorphic.
• Understanding the HLA profiles of indigenous populations is essential for tracing human migration patterns and genetic diversity.
• The Mayo ethnic group in Sinaloa, Mexico, has a unique genetic heritage that warranted investigation.

Purpose of the Study:

• To characterize the HLA class I and class II alleles of the Mayo ethnic group.
• To compare the Mayo HLA profile with other Amerindian and global populations.
• To identify novel HLA haplotypes specific to the Mayo population.

Main Methods:

• Analysis of HLA class I and class II alleles in 60 unrelated individuals from the Mayo ethnic group.
• Comparison of Mayo HLA data with a dataset of 14,896 chromosomes from various populations.
• Application of genetic distance calculations, Neighbor-Joining dendrograms, and correspondence analyses to assess genetic relationships.

Main Results:

• Identification of four novel HLA haplotypes specific to the Mayo population.
• The typical Mesoamerican HLA-DRB1*0407 allele constitutes 40% of all DRB1 alleles in the Mayo group, indicating a founder effect.
• Despite linguistic similarities, the Mayo and Tarahumara groups show distinct genetic profiles, highlighting the divergence of gene and language evolution.
• No European HLA genes were detected in the Mayo population, contrasting with the higher prevalence of European genes in the Sinaloa region.

Conclusions:

• The Mayo ethnic group possesses distinct HLA haplotypes, suggesting unique evolutionary trajectories.
• The high frequency of HLA-DRB1*0407 supports a founder effect within the Mayo population.
• Genetic and linguistic evolutions do not necessarily correlate, as evidenced by the Mayo and Tarahumara groups.
• The absence of European HLA alleles in the Mayo population has significant implications for HLA and disease association studies and the development of targeted transplant programs.