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Immunoglobulin G subclass deficiencies.

T Söderström, R Söderström, A Avanzini

    International Archives of Allergy and Applied Immunology
    |January 1, 1987
    PubMed
    Summary

    Low immunoglobulin G (IgG) subclass levels are common in patients prone to infections. This study in 503 individuals found IgG2 deficiency most frequent in children and IgG3 deficiency in adults, often linked to lymphocyte dysfunction.

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    Area of Science:

    • Immunology
    • Clinical Medicine
    • Genetics

    Background:

    • Low serum immunoglobulin G (IgG) subclass levels are frequently observed in individuals with heightened susceptibility to infections.
    • This condition can indicate underlying immune system defects, impacting the body's ability to fight pathogens.

    Purpose of the Study:

    • To analyze data from 503 individuals with immunoglobulin G (IgG) subclass deficiencies.
    • To identify common IgG subclass deficiencies in different age groups and sexes.
    • To investigate the association between IgG subclass deficiency and lymphocyte dysfunction, and to assess the potential benefits of immunoglobulin substitution therapy.

    Main Methods:

    • Retrospective analysis of data from 503 patients with immunoglobulin G (IgG) subclass deficiencies.
    • Evaluation of demographic data (age, sex) and IgG subclass levels.
    • In vitro assessment of T and B lymphocyte function.
    • Administration of vaccinations and performance of mucosal biopsies to guide treatment decisions.

    Main Results:

    • Low immunoglobulin G2 (IgG2) levels were the most common deficiency in children, with boys more frequently affected.
    • From age 16 onwards, females showed a higher prevalence of deficiencies, with low immunoglobulin G3 (IgG3) levels being most frequent.
    • In vitro lymphocyte dysfunction was observed in 75% of the individuals studied.

    Conclusions:

    • Low immunoglobulin G (IgG) subclass levels, particularly IgG2 in children and IgG3 in adults, are significant indicators of increased infection susceptibility.
    • The high prevalence of lymphocyte dysfunction suggests these deficiencies may signal underlying B or T cell defects.
    • Further evaluation through vaccinations and mucosal biopsies is crucial for determining eligibility for immunoglobulin substitution therapy.

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