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Related Experiment Videos

Nonrandom T-cell receptor J beta usage pattern in human CD4+ and CD8+ peripheral T cells

M Jeddi-Tehrani1, J Grunewald, V Hodara

  • 1Department of Immunology, Karolinska Institute, Stockholm, Sweden.

Human Immunology
|June 1, 1994
PubMed
Summary

T-cell receptor (TCR) gene segment usage varies between CD4+ and CD8+ T cells, with specific J beta segments showing biases. CD8+ T cells exhibit more TCR V beta/J beta expansions than CD4+ T cells.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • T-cell receptor (TCR) gene rearrangement is crucial for adaptive immunity.
  • Understanding TCR V beta and J beta gene segment usage provides insights into T-cell repertoire diversity.
  • The chromosomal location of V beta gene segments may influence their usage.

Purpose of the Study:

  • To analyze the association frequencies of TCR J beta gene segments with six V beta families in CD4+ and CD8+ T-cell subsets.
  • To investigate potential correlations between the genomic position of V beta gene segments and their usage.
  • To identify biases in J beta gene segment usage within different T-cell populations.

Main Methods:

  • Analysis of T-cell populations from healthy blood donors.

Related Experiment Videos

  • Examination of TCR J beta gene segment associations with six specific V beta families.
  • Comparison of gene segment usage frequencies between CD4+ and CD8+ T-cell subsets.

    • Main Results:

    • All 13 J beta gene segments were used with all tested V beta families in both CD4+ and CD8+ T cells.
    • No correlation was observed between V beta genomic position and J beta gene segment usage.
    • J beta gene segment usage was nonrandom, with J beta family 2 used more frequently than J beta family 1.
    • Specific J beta segments showed biases towards CD4+ (e.g., J beta 1.3, J beta 1.6) or CD8+ T cells (e.g., J beta 2.1 with V beta 8/9).
    • Expanded V beta/J beta associations were more common in CD8+ T cells (62/70 cases).

    Conclusions:

    • TCR J beta gene segment usage is nonrandom and exhibits subset-specific biases.
    • CD8+ T cells show a higher propensity for TCR V beta/J beta-restricted expansions compared to CD4+ T cells.
    • These findings contribute to understanding T-cell repertoire formation and potential roles in immune responses.