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Congenital hypothyroidism and HLA

E Oxtoby, D F Roberts, J Wentzel

    Tissue Antigens
    |January 1, 1982
    PubMed
    Summary

    Congenital hypothyroidism shows a unique association with HLA-A11 antigen, unlike other thyroid disorders. This study found no significant HLA associations in patients or their families, suggesting distinct genetic links.

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    Area of Science:

    • Immunogenetics
    • Endocrinology

    Background:

    • Human Leukocyte Antigen (HLA) genes are crucial for immune response and have been linked to various autoimmune and endocrine disorders.
    • Congenital hypothyroidism (CH) is a common endocrine disorder with potential genetic underpinnings.
    • Previous studies suggest associations between HLA antigens and other thyroid diseases, such as Graves' disease and Hashimoto's thyroiditis.

    Purpose of the Study:

    • To investigate the association between HLA-A, B, and C antigens and congenital hypothyroidism.
    • To compare HLA antigen frequencies in CH patients and their families with healthy controls.
    • To determine if HLA associations in CH differ from those observed in other thyroid disorders.

    Main Methods:

    • HLA-A, B, and C antigen typing was performed on 97 patients diagnosed with congenital hypothyroidism and their family members.
    • Frequencies of HLA antigens in patients and relatives were compared to a control group of 635 individuals.
    • Statistical analysis, including relative risk calculation and adjustment for multiple testing, was employed.

    Main Results:

    • A statistically significant negative association was observed between congenital hypothyroidism and the HLA-A11 antigen (relative risk = 0.190) after adjusting for the number of tests.
    • No significant HLA associations were found in the family members of CH patients.
    • Patients with CH did not exhibit increased homozygosity or deviations in HLA haplotype frequencies compared to controls.

    Conclusions:

    • Congenital hypothyroidism demonstrates a distinct genetic relationship with HLA antigens compared to other thyroid disorders.
    • The observed negative association with HLA-A11 warrants further investigation into its specific role in the pathogenesis of CH.
    • The lack of significant associations in relatives suggests that the genetic factors influencing CH may be complex and not solely driven by direct HLA linkage.

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