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Structure and genetic variants of thyroglobulin: Pathophysiological implications.

Cintia E Citterio1, Carina M Rivolta1, Héctor M Targovnik1

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Thyroglobulin (TG) defects cause congenital hypothyroidism (CH), impacting growth and development. Understanding TG gene variations and structure is crucial for diagnosing and managing CH effectively.

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Area of Science:

  • Endocrinology and Genetics
  • Molecular Biology
  • Developmental Biology

Background:

  • Thyroglobulin (TG) is essential for thyroid hormone (TH) synthesis, vital for vertebrate development.
  • Genetic defects in TG cause congenital hypothyroidism (CH), leading to intellectual disability and growth impairment if untreated.
  • Recent advances include identifying 229 human TG gene variations and elucidating TG's 3D structure.

Purpose of the Study:

  • To review advances in understanding TG structure and the pathophysiology of CH linked to TG defects.
  • To provide insights into managing congenital disorders and counseling families with TG abnormalities.
  • To summarize TH synthesis within TG and analyze animal/cellular models of TG deficiency.

Main Methods:

  • Literature review of TG structure, function, and genetic variations.
  • Analysis of pathophysiological mechanisms in congenital hypothyroidism.
  • Synthesis of data from animal and cellular models of TG deficiency.

Main Results:

  • 229 human TG gene variations identified; TG 3D structure elucidated.
  • Monoallelic TG variants suggest potential oligogenic inheritance patterns for CH.
  • Established role of TG in TH synthesis and identified models for studying thyroid dyshormonogenesis.

Conclusions:

  • Functional characterization of TG variants is critical for advancing CH research.
  • New insights improve management strategies and family counseling for TG-related disorders.
  • Continued investigation into TG pathophysiology holds promise for future therapeutic developments.