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Related Experiment Videos

Human T-cell receptor beta-chain genes.

T H Rabbitts, J Sims, W Smith

    Annales De L'Institut Pasteur. Immunologie
    |January 1, 1985
    PubMed
    Summary
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    LMO2 and IL2RG synergize in thymocytes to mimic the evolution of SCID-X1 gene therapy-associated T-cell leukaemia.

    Leukemia·2016

    Human T-cell receptor beta chain gene analysis reveals significant inherited diversity and gene rearrangement mechanisms. Similar to immunoglobulin genes, T-cell receptor beta chain genes exhibit complex rearrangement and deletion patterns.

    Area of Science:

    • Immunology
    • Molecular Biology
    • Genetics

    Background:

    • The T-cell receptor (TCR) is crucial for adaptive immunity, mediating specific recognition of antigens.
    • Understanding the genetic basis of TCR diversity is essential for comprehending immune responses and related diseases.
    • Previous studies have begun to elucidate the structure and organization of TCR genes.

    Purpose of the Study:

    • To investigate the genetic organization and rearrangement of the T-cell receptor beta chain (TCR beta) in human T-cell leukemia.
    • To identify the number and diversity of variable (V beta) and constant (C beta) region genes.
    • To explore the mechanisms of TCR beta gene rearrangement and their implications.

    Main Methods:

    • Analysis of cDNA clones from the human leukaemic cell line JM.

    Related Experiment Videos

  • Hybridization studies using V beta probes on RNA from JM cells and other T-cell leukaemias.
  • Southern blot analysis of genomic DNA digests with V beta probes.
  • Investigation of beta-chain constant region genes (C beta 1 and C beta 2).

    • Main Results:

    • TCR beta chain cDNA clones from JM cells hybridized only to JM cell RNA, not other T-cell leukaemias.
    • Genomic DNA digests revealed multiple hybridizing bands with a V beta probe, indicating significant inherited V beta gene diversity.
    • Human genomic DNA contains two beta-chain constant region genes (C beta 1 and C beta 2).
    • Both C beta 1 and C beta 2 genes are capable of rearrangement in T-cell DNA.
    • Rearrangement of the downstream C beta 2 gene can lead to the deletion of the C beta 1 gene.

    Conclusions:

    • The human TCR beta chain locus exhibits significant inherited V beta gene diversity.
    • Two functional C beta genes (C beta 1 and C beta 2) are present and undergo rearrangement.
    • TCR beta gene rearrangement and deletion mechanisms share analogies with immunoglobulin gene loci.
    • These findings contribute to understanding TCR gene organization and its role in T-cell development and potential leukemogenesis.