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Human T cell receptor V beta gene polymorphism.

P Concannon, R A Gatti, L E Hood

    The Journal of Experimental Medicine
    |April 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers analyzed human T cell receptor V beta genes, finding variations like gene absence and potential gene conversion. Polymorphisms in these genes suggest close linkage and enable haplotype generation for disease association studies.

    Area of Science:

    • Immunogenetics
    • Human molecular genetics

    Background:

    • The human T cell receptor (TCR) beta chain complex is crucial for adaptive immunity.
    • Understanding the diversity and genetic variability of TCR V beta genes is essential for immunogenetic research.

    Purpose of the Study:

    • To characterize the sizes of human T cell receptor V beta gene subfamilies.
    • To identify genetic variations within V beta gene segments and assess their potential for linkage analysis.
    • To explore the association of TCR genes with inherited immune system diseases.

    Main Methods:

    • Southern blot hybridizations using human T cell receptor V beta gene probes.
    • DNA analysis of unrelated individuals and consanguineous donors.
    • Restriction enzyme analysis to detect restriction fragment length polymorphisms (RFLPs).

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    Main Results:

    • Identified one individual lacking a V beta gene segment and another with an altered V beta repertoire, possibly due to gene conversion.
    • Detected RFLPs in 12 of 14 examined V beta gene segment subfamilies.
    • Observed linkage disequilibrium among some V beta alleles, suggesting close physical linkage, and demonstrated Mendelian inheritance of polymorphisms.

    Conclusions:

    • The human TCR beta chain complex exhibits a high degree of polymorphism.
    • Generated informative haplotypes, facilitating further genetic studies.
    • The identified polymorphisms provide a basis for investigating associations between TCR genes and inherited immune disorders.