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The Ia antigens.

D H Sachs

    Contemporary Topics in Molecular Immunology
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Immune response genes, known as Ia antigens, are defined genetically within the H-2 complex. These polymorphic cell surface determinants are primarily found on B cells but also on other cells and T-cell factors.

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    Area of Science:

    • Immunogenetics
    • Cellular immunology
    • Histocompatibility antigens

    Background:

    • The Immune response (Ir) region of the H-2 complex encodes for the Major Histocompatibility Complex (MHC) class II molecules, also known as Ia antigens.
    • Ia antigens are polymorphic cell surface determinants crucial for immune regulation.
    • Their definition is primarily genetic, with specificities mapped to subregions I-A, I-B, and I-C.

    Purpose of the Study:

    • To define and characterize Ia antigens and their specificities.
    • To explore the genetic mapping and serological definition of Ia antigens.
    • To investigate the expression patterns and functional roles of Ia antigens.

    Main Methods:

    • Genetic mapping using recombinant haplotypes within the H-2 complex.

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  • Serological definition through direct immunization, polyspecific sera, and selective absorption techniques.
  • Correlative criteria including tissue distribution, molecular size, and association with other cell surface molecules.

    • Main Results:

    • Numerous Ia specificities are mapped to the I-A subregion, several to I-C, and few to I-B.
    • Ia antigens are predominantly expressed on B cells but also detected on T cells, macrophages, sperm, and epidermal cells.
    • Serological methods and correlative criteria aid in identifying Ia specificities, though mapping to the I region is essential for confirmation.

    Conclusions:

    • Ia antigens are complex polymorphic determinants encoded by the H-2 complex's I region.
    • Understanding their genetic basis and expression is vital for comprehending immune responses.
    • Further studies with appropriate recombinant strains are necessary for precise mapping and definitive characterization.