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Related Experiment Videos

Genomically imposed and somatically modified human thymocyte V beta gene repertoires.

R Baccala1, D H Kono, S Walker

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

Proceedings of the National Academy of Sciences of the United States of America
|April 1, 1991
PubMed
Summary

Human T-cell receptor (TCR) V beta gene expression varies in the thymus. Unlike mice, superantigen-driven deletions are rare in humans, but gene expression changes occur during T-cell maturation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Human Genetics

Background:

  • Thymic selection shapes the T-cell receptor (TCR) repertoire.
  • The T-cell receptor beta-chain variable region (V beta) gene repertoire is crucial for adaptive immunity.
  • Understanding V beta gene expression in humans is key to T-cell development.

Purpose of the Study:

  • To investigate the impact of thymic selection on the human V beta gene repertoire.
  • To analyze V beta gene expression patterns in thymocytes and mature T-cell subsets.
  • To compare human V beta deletion mechanisms with those observed in mice.

Main Methods:

  • Utilized a multiprobe RNase protection assay to quantify V beta gene transcripts.
  • Analyzed V beta gene expression across 17 human thymuses and within thymocyte subsets.

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  • Identified coding region polymorphisms and assessed V beta gene deletions.

    • Main Results:

    • Detected variable abundance of transcripts for 22 V beta genes across individuals.
    • Found no evidence of genomic deletions but identified coding region polymorphisms.
    • Observed altered V beta gene expression in mature single-positive thymocytes, with rare superantigen-mediated deletions.

    Conclusions:

    • Human V beta repertoire expression is diverse and subject to thymic influences.
    • Superantigen-mediated V beta deletions appear uncommon in humans compared to mice.
    • Differential V beta gene expression in mature thymocytes suggests complex selection processes, possibly involving weak antigens or altered selection.