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Autoimmunity in selective IgA deficiency.

J V Wells, D Michaeli, H H Fudenberg

    Birth Defects Original Article Series
    |January 1, 1975
    PubMed
    Summary
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    Selective IgA deficiency patients frequently have antibodies to human IgM and collagen. These autoantibodies were not linked to clinical symptoms, and their origins remain unclear.

    Area of Science:

    • Immunology
    • Human Genetics
    • Autoimmunity

    Background:

    • Selective IgA deficiency (SIgAD) is an immune disorder characterized by low levels of immunoglobulin A.
    • Previous studies have indicated the presence of various antibodies in individuals with SIgAD.

    Purpose of the Study:

    • To investigate the prevalence of antibodies to human IgM and native human collagen in patients with selective IgA deficiency.
    • To compare antibody levels in SIgAD patients with those in healthy controls.
    • To explore potential associations between these antibodies and clinical manifestations.

    Main Methods:

    • Serological analysis of 60 subjects with selective IgA deficiency.
    • Comparison with antibody levels in normal control subjects.
    • Statistical analysis to assess associations between antibodies and clinical features.

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    Main Results:

    • Antibodies to human IgM were detected in 35% of SIgAD patients, compared to 1.6% in controls.
    • Antibodies to native human collagen were found in 34% of SIgAD patients, versus 2.0% in controls.
    • Anti-IgM isoantibodies were distinct from antibodies to ruminant proteins.
    • No significant correlation was found between the presence of these antibodies and clinical features in individual patients.

    Conclusions:

    • Individuals with selective IgA deficiency exhibit a higher prevalence of antibodies targeting human IgM and collagen.
    • The detected autoantibodies do not appear to correlate with clinical symptoms in SIgAD patients.
    • The underlying cause for the development of these antibodies in SIgAD remains undetermined.