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Related Experiment Videos

Naturally occurring mutations in the thyroglobulin gene.

Jussara Vono-Toniolo1, Carina M Rivolta, Héctor M Targovnik

  • 1Division of Endocrinology, Metabolism & Molecular Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA. vono.toniolo@terra.com.br

Thyroid : Official Journal of the American Thyroid Association
|September 29, 2005
PubMed
Summary

Thyroglobulin (Tg) gene mutations cause goiter and hypothyroidism by impairing thyroid hormone synthesis and storage. This review examines these genetic defects in humans and animals, clarifying nomenclature issues.

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Area of Science:

  • Endocrinology
  • Genetics
  • Molecular Biology

Background:

  • Thyroglobulin (Tg) is crucial for thyroid hormone synthesis (T4, T3) and storage.
  • Tg is secreted into the follicular lumen, internalized for hormone release, and stored with iodide.
  • Mutations in the Tg gene lead to goiter and hypothyroidism.

Purpose of the Study:

  • To review the nature and consequences of naturally occurring Tg gene mutations.
  • To discuss these mutations in both human patients and animal models.
  • To clarify discrepancies in mutation nomenclature.

Main Methods:

  • Literature review of studies on Tg gene mutations.
  • Analysis of molecular data from affected individuals and animal species.
  • Discussion of nomenclature recommendations and numbering systems.

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Main Results:

  • Biallelic Tg gene mutations cause goiter and hypothyroidism, often with large, growing goiters.
  • Mutations can result in homozygous or compound heterozygous loss-of-function.
  • Some alterations lead to secretory defects and endoplasmic reticulum storage disease (ERSD).

Conclusions:

  • Naturally occurring Tg gene mutations have significant clinical consequences, including goiter and hypothyroidism.
  • Understanding these mutations is vital for diagnosis and research across species.
  • Standardized nomenclature is needed to reconcile differing reports on Tg gene alterations.