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Murine MHC polymorphism and T cell specificities.

S Roy1, M T Scherer, T J Briner

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Science (New York, N.Y.)
|May 5, 1989
PubMed
Summary
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Polymorphic major histocompatibility complex (MHC) molecules bind peptides, enabling T lymphocytes to initiate immune responses. Species-wide broad antigen recognition explains the extensive MHC gene diversity.

Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • The Major Histocompatibility Complex (MHC) genes exhibit significant polymorphism in humans and mice.
  • MHC gene products function as peptide receptors, presenting bound peptides to T lymphocytes for immune surveillance.

Purpose of the Study:

  • To investigate the relationship between polymorphic MHC molecules and their peptide-binding specificity.
  • To understand the evolutionary pressures driving MHC polymorphism.

Main Methods:

  • Analysis of peptide-binding specificities of various MHC molecules.
  • Comparative assessment of antigen recognition capabilities at individual and species levels.

Main Results:

  • MHC molecules display specificities for particular peptide sequences.

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  • While individual organisms have limited antigen recognition capacity, the species collectively exhibits broad reactivity to diverse antigens.

    • Conclusions:

    • The broad antigen-recognition repertoire of a species, facilitated by polymorphic MHC molecules, is crucial for effective immune defense against a wide array of pathogens.
    • This broad reactivity provides a strong evolutionary rationale for the high degree of MHC polymorphism observed across populations.