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Related Experiment Videos

Monoclonal thyroglobulin autoantibodies: variable region analysis and epitope recognition

L Prentice1, Y Kiso, N Fukuma

  • 1Endocrine Immunology Unit, University of Wales College of Medicine, Cardiff, United Kingdom.

The Journal of Clinical Endocrinology and Metabolism
|March 1, 1995
PubMed
Summary

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Thyroglobulin autoantibodies (TgAAb) target two main sites on thyroglobulin. The prevalence of these TgAAb types differs between healthy individuals and those with autoimmune thyroid disease (AITD).

Area of Science:

  • Immunology
  • Molecular Biology
  • Autoimmunity

Background:

  • Thyroglobulin autoantibodies (TgAAb) are key biomarkers in autoimmune thyroid disease (AITD).
  • Understanding TgAAb epitope specificity and molecular origins is crucial for diagnosing and managing AITD.
  • Previous research has focused on the presence of TgAAb but less on their specific binding sites and genetic underpinnings.

Purpose of the Study:

  • To characterize human monoclonal TgAAb and their binding sites on thyroglobulin (Tg).
  • To investigate the relationship between variable (V) region gene sequences and epitope specificity of TgAAb.
  • To determine the distribution of different TgAAb types in healthy individuals versus AITD patients.

Main Methods:

  • Utilized a panel of human monoclonal TgAAb for epitope mapping on Tg.

Related Experiment Videos

  • Performed inhibition assays with monoclonal TgAAb (Fab)2 fragments to define binding sites.
  • Analyzed V region gene sequences of TgAAb to assess germline gene usage and complementarity determining regions (CDRs).

    • Main Results:

    • Identified two major conformational epitopes (Type I and Type II) on the Tg molecule targeted by TgAAb.
    • Type I TgAAb were more prevalent in healthy individuals, while Type II TgAAb predominated in AITD patients.
    • TgAAb with similar epitope specificity exhibited significant molecular heterogeneity in V region gene usage and CDR sequences.

    Conclusions:

    • TgAAb recognize two primary conformational epitopes on Tg, with distinct proportions in healthy and AITD populations.
    • Molecular diversity exists within TgAAb populations binding to the same or similar epitopes, indicating convergent evolution.
    • These findings enhance our understanding of the molecular basis of autoimmunity in thyroid disease.