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A primate species with limited major histocompatibility complex class I polymorphism.
D I Watkins1, F S Hodi, N L Letvin
1Harvard Medical School, New England Regional Primate Research Center, Southborough, MA 01772.
Summary
Cotton-top tamarins exhibit limited major histocompatibility complex (MHC) class I diversity, unlike other primates. This lack of polymorphism may increase their susceptibility to diseases and pathogens.
Area of Science:
- Immunogenetics
- Primate immunology
- Conservation genetics
Background:
- Extensive polymorphism in the major histocompatibility complex (MHC) is crucial for population-level immune defense.
- Cotton-top tamarins (Saguinus oedipus) are susceptible to ulcerative colitis, colon cancer, and viral infections.
- A common MHC class I allelic product was found on lymphocytes of all tested tamarins.
Purpose of the Study:
- To investigate the polymorphism of major histocompatibility complex (MHC) class I and class II genes in cotton-top tamarins.
- To determine if limited MHC diversity contributes to disease susceptibility in this primate species.
Main Methods:
- Analysis of lymphocyte surface expression of MHC gene products.
- Restriction fragment length polymorphism (RFLP) analysis of MHC class I and class II genes.
Main Results:
- A limited number of cotton-top tamarin MHC class I alleles were identified.
- MHC class II gene loci in cotton-top tamarins were found to be polymorphic.
- Four other MHC class I allelic products were expressed at high frequency (>50%) in the studied population.
Conclusions:
- The sharing of MHC class I alleles among cotton-top tamarins is unprecedented in higher primates.
- Limited MHC class I diversity may play a role in the susceptibility of this endangered species to various pathogens and diseases.