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Related Experiment Videos

Latent allotypes: a window to a genetic enigma.

M L Yarmush, J A Sogn, T J Kindt

    Annales D'Immunologie
    |March 1, 1979
    PubMed
    Summary

    Latent allotypes, present in low concentrations, were detected using sensitive assays in various biological samples. These findings suggest inherited regulatory mechanisms may control the expression of immunoglobulin genes.

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    Area of Science:

    • Immunogenetics
    • Molecular immunology

    Background:

    • Latent allotypes are immunoglobulin variants expressed at low levels, not predicted by standard genetic analysis.
    • Their presence suggests complex genetic regulation beyond simple Mendelian inheritance.

    Purpose of the Study:

    • To investigate the expression and characteristics of latent allotypes.
    • To explore potential in vivo recognition and regulatory mechanisms of allotypes.

    Main Methods:

    • Utilized sensitive assays to detect latent allotypes in sera, IgG, antibody fractions, and lymphoid cells.
    • Employed immunoadsorbent chromatography for isolation and typing of allotype-bearing molecules.
    • Measured IgG clearance rates in rabbits using differentially radiolabeled allotype-matched and non-matched samples.

    Main Results:

    • Latent allotypes of groups a, b, and d were identified in various biological matrices.
    • Molecules with latent group a allotypes were isolated and characterized.
    • No faster clearance of allotype-matched IgG was observed; in some cases, non-matched IgG cleared faster, indicating potential allotype recognition.

    Conclusions:

    • The data support genetic models involving unexpressed genomic information and inherited regulatory mechanisms for latent allotype expression.
    • Findings suggest that not all immunoglobulin genes may be present in every individual, but rather limited groups of allotypes.

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