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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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TSH resistance revisited.

Satoshi Narumi1, Tomonobu Hasegawa

  • 1Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan.

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|March 24, 2015
PubMed
Summary
This summary is machine-generated.

Thyroid-stimulating hormone (TSH) resistance, caused by TSH receptor gene mutations, leads to congenital hypothyroidism. A newly identified nonclassic form shows paradoxically high thyroidal iodine uptake.

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Area of Science:

  • Endocrinology
  • Genetics
  • Molecular Biology

Background:

  • Genetic defects in hormone receptors are a primary cause of hormone resistance.
  • Thyroid-stimulating hormone (TSH) resistance, resulting from TSH receptor gene (TSHR) mutations, is a key example.
  • TSHR mutations disrupt thyroid hormone production, leading to congenital hypothyroidism.

Purpose of the Study:

  • To review the pathophysiology and clinical features of TSH resistance caused by inactivating TSHR mutations.
  • To highlight the recently identified nonclassic form of TSH resistance.

Main Methods:

  • Literature review of studies on TSHR mutations and TSH resistance.
  • Analysis of clinical phenotypes associated with different TSHR mutation types.
  • Focus on the characteristics of nonclassic TSH resistance.

Main Results:

  • TSHR mutations cause varying degrees of TSH resistance, classified as uncompensated (severe hypothyroidism) or compensated (preserved function).
  • A nonclassic form of TSH resistance has been identified, characterized by unexpectedly high thyroidal iodine uptake.
  • Clinical phenotypes correlate with residual mutant receptor activity.

Conclusions:

  • Inactivating TSHR mutations are the cause of TSH resistance and congenital hypothyroidism.
  • Understanding the spectrum of TSH resistance, including the nonclassic form, is crucial for diagnosis and management.
  • Further research into the nonclassic form may reveal novel insights into TSH receptor function.