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MHC evolution and development of a recognition system

S Ohno1

  • 1Beckman Research Institute of the City of Hope, Duarte, California 91010-0269.

Annals of the New York Academy of Sciences
|April 15, 1994
PubMed
Summary
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Mammals lack a general self-non-self discrimination mechanism outside the immune system. The adaptive immune system

Area of Science:

  • Immunology
  • Genetics

Background:

  • Mammals generally lack a self-non-self discrimination mechanism outside the immune system.
  • Class I Major Histocompatibility Complex (MHC) antigens are polymorphic and ubiquitously expressed.
  • Some immune responses, like antiphosphocholine, do not require self-non-self discrimination.

Purpose of the Study:

  • To investigate the role of self-non-self discrimination in mammals.
  • To understand the evolution and function of MHC antigens.
  • To explore how the immune system distinguishes self from non-self, particularly in viral infections.

Main Methods:

  • Analysis of allophenic mice viability with MHC-different cell lines.
  • Review of existing knowledge on immune responses and MHC function.
  • Theoretical consideration of peptide fragment presentation by MHC molecules.

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Main Results:

  • Allophenic mice demonstrate that MHC-different cells can engage in organogenesis, indicating no general discrimination.
  • Self-non-self discrimination via MHC class I peptide fragments appears to be a later evolutionary addition.
  • MHC polymorphism is driven by the need to recognize diverse viral peptide fragments.

Conclusions:

  • Mammalian self-non-self discrimination is primarily an immune system function, not a general biological mechanism.
  • MHC class I antigens evolved to facilitate adaptive immunity against intracellular parasites like viruses.
  • Effective MHC alleles present common peptide fragments found in viral proteins, balancing self-recognition and pathogen detection.