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DQA-DQB linkage in Old World monkeys

L K Gaur1, M Pandarpurkar, J Anderson

  • 1Puget Sound Blood Center, Seattle, WA 98104, USA. lgaur@u.washington.edu

Tissue Antigens
|May 16, 1998
PubMed
Summary

Ancient linkages between MHC DQ alpha and beta chain genes in nonhuman primates mirror human patterns, suggesting conserved evolutionary mechanisms. Some unique linkages were also identified, highlighting species-specific evolutionary constraints.

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Area of Science:

  • Immunogenetics
  • Evolutionary Biology
  • Primate Genetics

Background:

  • The Major Histocompatibility Complex (MHC) DQ region, comprising alpha and beta chains, is highly polymorphic in both humans and nonhuman primates.
  • Strong linkage disequilibrium (LD) is observed between specific DQA and DQB alleles in humans, influencing immune system diversity.

Purpose of the Study:

  • To investigate the evolutionary conservation of MHC DQ gene linkages between nonhuman primates and humans.
  • To identify shared and novel patterns of linkage disequilibrium in primate MHC DQ regions.

Main Methods:

  • Analysis of MHC DQ alpha (DQA1) and beta (DQB1) chain alleles in baboons (Papio cynocephalus anubis) and pigtailed macaques (Macaca nemestrina).
  • Examination of cis-linkages between DQA1 and DQB1 alleles in unrelated baboons and through family segregation analysis in macaques.

Main Results:

  • Identified conserved cis-linkages between DQA1 and DQB1 alleles in primates that are also prominent in humans (e.g., DQA1*01-DQB1*05/*06, DQA1*05-DQB1*03, DQA1*03-DQB1*03).
  • Discovered a novel linkage (DQA1*05-DQB1*06) in primates not previously observed in humans.
  • These findings indicate that patterns of selective linkage disequilibrium have ancient origins and are subject to evolutionary constraints post-species divergence.

Conclusions:

  • Linkage patterns within the primate MHC DQ region reveal ancient evolutionary roots shared with humans.
  • The observed selective linkage disequilibrium suggests evolutionary mechanisms that constrain haplotype diversity across species.
  • The identification of both conserved and novel linkages provides insights into the evolutionary history of the immune system.

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