Dataset Information

New insights into thyroglobulin pathophysiology revealed by the study of a family with congenital goiter.

ABSTRACT:

Context

Thyroglobulin (TG) gene mutations cause congenital hypothyroidism (CH) with goiter. A founder effect has been proposed for some frequent mutations. Mutated proteins have a defect in intracellular transport causing intracellular retention with ultrastructural changes that resemble an endoplasmic reticulum storage disease.

Objective

To reveal new aspects of thyroglobulin pathophysiology through clinical, cellular, molecular, and genetic studies in a family presenting with CH due to TG mutations from Galicia, an iodine-deficient area of Spain.

Design

The included clinical evaluation of family members, DNA sequencing for TG gene mutation and haplotyping analysis, ultrastructural analysis of thyroid tissue specimens from affected subjects, analysis of effects of mutations found on TG gene transcription, and in vitro studies of cellular production and secretion of mutated proteins.

Setting

Locations included primary care and university hospitals.

Results

Family members with CH, mental retardation, and goiter were compound heterozygous for c.886C-->T (p.R277X) and g.IVS35+1delG. For c.886C-->T, a founder effect cannot be excluded, and its transcription was hardly detectable. g.IVS35+1delG caused an in-frame deletion in exon 35 and produced a protein that, although synthesized, could not be secreted. Ultrastructural analyses showed morphological changes consistent with an endoplasmic reticulum storage disease.

Conclusion

The shorter thyroglobulin resulting from the novel g.IVS35+1delG was retained within the endoplasmic reticulum of thyrocytes, and together with p.R227X caused severe hypothyroidism with goiter. p.R277X, the most commonly described TG mutation, is caused by a TG exon-7 highly mutation-prone region, and the possibility that some cases were introduced to South America from Galicia cannot be excluded.

SUBMITTER: Peteiro-Gonzalez D

PROVIDER: S-EPMC2928901 | biostudies-literature | 2010 Jul

REPOSITORIES: biostudies-literature

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Publications

New insights into thyroglobulin pathophysiology revealed by the study of a family with congenital goiter.

Peteiro-Gonzalez D D Lee J J Rodriguez-Fontan J J Castro-Piedras I I Cameselle-Teijeiro J J Beiras A A Bravo S B SB Alvarez C V CV Hardy D M DM Targovnik H M HM Arvan P P Lado-Abeal J J

The Journal of clinical endocrinology and metabolism 20100421 7

<h4>Context</h4>Thyroglobulin (TG) gene mutations cause congenital hypothyroidism (CH) with goiter. A founder effect has been proposed for some frequent mutations. Mutated proteins have a defect in intracellular transport causing intracellular retention with ultrastructural changes that resemble an endoplasmic reticulum storage disease.<h4>Objective</h4>To reveal new aspects of thyroglobulin pathophysiology through clinical, cellular, molecular, and genetic studies in a family presenting with CH ...[more]

PMID: 20410234

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Dataset Information

New insights into thyroglobulin pathophysiology revealed by the study of a family with congenital goiter.

Context

Objective

Design

Setting

Results

Conclusion

Publications

New insights into thyroglobulin pathophysiology revealed by the study of a family with congenital goiter.

Similar Datasets

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