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A new polymorphic determinant on HLA-DQ molecules.

M A Shipp, P Ahmed, C C Kannapell

    Human Immunology
    |May 1, 1986
    PubMed
    Summary
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    Researchers identified a new polymorphic determinant, HK-13, on human leukocyte antigen (HLA) DQ molecules. This discovery enhances understanding of immune response genes and their expression on B lymphocytes.

    Area of Science:

    • Immunogenetics
    • Molecular Immunology
    • Cell Biology

    Background:

    • Immune response genes in humans are located in the HLA-D/DR region.
    • Ia antigens, gene products of this region, are expressed on various immune cells, including B lymphocytes and monocytes.
    • A previously identified Ia antigen, K19, showed preferential expression on mature B lymphocytes.

    Purpose of the Study:

    • To characterize a new monoclonal antibody, HK-13, recognizing the K19 molecule.
    • To investigate the nature and expression pattern of the K19/K13 molecule.
    • To determine if HK-13 represents a new determinant within the HLA system.

    Main Methods:

    • Monoclonal antibody production and characterization (HK-13).
    • Cytofluorography, 2D gel electrophoresis, tryptic peptide mapping, and N-terminal amino acid sequencing.

    Related Experiment Videos

  • Reactivity analysis on a panel of human leukocyte antigen (HLA) typing cells.

    • Main Results:

    • The monoclonal antibody HK-13 recognized the same molecule as HK-19, identified as K19.
    • Detailed characterization revealed K19 and K13 as epitopes on HLA-DQ (DC) molecules.
    • HK-13 reactivity did not correlate with known HLA-DQ polymorphic determinants, indicating a novel determinant.

    Conclusions:

    • HK-13 defines a new polymorphic determinant of the HLA-DQ series.
    • This finding contributes to the understanding of HLA polymorphism and immune response gene variation.
    • The characterization of HK-13 provides a new tool for immunogenetic research.