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"Bare lymphocytes" without immunodeficiency.

R Payne, F M Brodsky, B M Peterlin

    Human Immunology
    |April 1, 1983
    PubMed
    Summary
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    Two siblings presented with a rare condition, lacking specific human leukocyte antigens (HLA)-A, B, and C on their lymphocytes. This suggests a potential regulatory defect affecting Class I antigen expression.

    Area of Science:

    • Immunogenetics
    • Molecular immunology
    • Human leukocyte antigen (HLA) system

    Background:

    • The human leukocyte antigen (HLA) system is crucial for immune regulation and tissue compatibility.
    • Class I HLA antigens (HLA-A, B, C) are cell surface glycoproteins essential for T-cell recognition.

    Observation:

    • Two siblings, aged nine and six, exhibited "bare lymphocytes" lacking detectable HLA-A, B, and C antigens on peripheral blood lymphocytes.
    • The condition persisted over 21 months, with the elder sibling presenting with aplastic anemia.

    Findings:

    • While Class II HLA-DR antigens were present, Class I HLA-A, B, and C antigens were significantly reduced, as detected by monoclonal antibodies.
    • EBV-transformed cells confirmed reduced HLA Class I antigen levels.
    • Immunoprecipitation and Southern blot analysis ruled out gross genomic rearrangements or significant structural abnormalities.

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    Implications:

    • A regulatory defect in the expression of HLA Class I antigens is postulated.
    • Understanding this defect could offer insights into immune regulation and potential therapeutic targets for related disorders.
    • This case highlights the complexity of HLA antigen expression and its genetic regulation.