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Related Experiment Videos

Human T-cell receptor variable gene segment families

B Arden1, S P Clark, D Kabelitz

  • 1Paul-Ehrlich-Institute, Langen, Germany.

Immunogenetics
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Researchers analyzed human T-cell receptor (TCR) gene segments, refining classifications and identifying functional repertoires for TCR alpha/delta, beta, and gamma (TCRA/D, B, G) variable (V) genes. This work clarifies TCR gene segment diversity and relationships.

Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Human T-cell receptors (TCRs) are critical for adaptive immunity.
  • Variable (V) gene segments of TCR alpha/delta, beta, and gamma chains exhibit significant diversity.
  • Accurate classification and repertoire estimation are essential for understanding immune responses.

Purpose of the Study:

  • To construct comprehensive DNA and protein sequence alignments for human TCR V gene segments.
  • To refine the classification and determine the functional repertoire of TCR V gene segments.
  • To investigate sequence-based relationships and potential functional implications among TCR V gene families.

Main Methods:

  • Multiple sequence alignment of human TCRA/D, B, and G V gene segments.

Related Experiment Videos

  • Application of standard nomenclature for derived sequence names.
  • Discrimination between alleles and genes from different loci to define functional repertoires.

    • Main Results:

    • Confirmed traditional subfamily classifications with a larger sequence dataset.
    • Reduced over 150 TCRBV sequences to 47 functional gene segments and over 100 TCRAV sequences to 42 functional gene segments.
    • Identified two key residues distinguishing V delta from V alpha, suggesting roles in chain pairing and potentially V beta/V gamma relationships due to CDR2 length.

    Conclusions:

    • The study provides a refined catalog of human TCR V gene segments.
    • The identified functional repertoires offer a more accurate basis for immunological studies.
    • Sequence analysis reveals structural insights into TCR V gene segment evolution and potential functional constraints.