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Related Experiment Videos

New human V beta genes and polymorphic variants.

A Plaza1, D H Kono, A N Theofilopoulos

  • 1Department of Immunology, Scripps Clinic and Research Foundation, La Jolla, CA 92037.

Journal of Immunology (Baltimore, Md. : 1950)
|December 15, 1991
PubMed
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Researchers identified nine new human V beta genes and several allelic variants, expanding the understanding of T cell receptor diversity. This V beta gene polymorphism suggests significant immune system adaptation to antigens and superantigens.

Area of Science:

  • Immunology
  • Human Genetics
  • Molecular Biology

Background:

  • The human V beta gene repertoire is crucial for T cell receptor (TCR) diversity and immune response.
  • Previous characterization of the V beta gene repertoire was incomplete, necessitating further investigation.

Purpose of the Study:

  • To extend the characterization of the human V beta gene repertoire.
  • To identify novel V beta genes and allelic variants.
  • To investigate the significance of V beta gene polymorphism in human immune adaptation.

Main Methods:

  • Utilized anchored or V beta-specific polymerase chain reaction (PCR) to generate a large beta-chain library from human thymus.
  • Sequenced approximately 200 V beta clones.
  • Conducted population and family studies to confirm allelic variants.

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Main Results:

  • Identified nine new V beta genes, including members of new subfamilies (V beta 22, 23) and existing ones (V beta 2, 5, 6, 7, 9, 12).
  • Obtained full-length sequences for previously partially identified V beta genes (V beta 3, 5.3, 9.1, 13.4) and extended others (V beta 7.1, 7.2).
  • Tentatively identified six apparent allelic variants (V beta 2.1, 5.3, 7.2, 8.2, 13.4, 16), with two confirmed through population and family studies.

Conclusions:

  • V beta gene polymorphism is significant in humans.
  • Nonconservative substitutions in V beta alleles are located in hypervariable loops or framework regions.
  • V beta gene polymorphism may result from selective pressures exerted by conventional antigens or superantigens.