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Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model
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Resistance to thyroid hormone.

Kazumichi Onigata1, Gabor Szinnai

  • 1Postgraduate Clinical Practice Center and Department of Pediatrics, Shimane Faculty of Medicine, Izumo, Japan.

Endocrine Development
|September 19, 2014
PubMed
Summary
This summary is machine-generated.

Resistance to thyroid hormone (RTH) is a genetic disorder affecting thyroid hormone sensitivity. This review details RTH alpha and RTH beta, covering their clinical, biochemical, and genetic aspects for diagnosis and treatment.

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Area of Science:

  • Endocrinology
  • Genetics
  • Molecular Biology

Background:

  • Resistance to thyroid hormone (RTH) or thyroid hormone action defect (THAD) represents the most common cause of reduced thyroid hormone sensitivity.
  • RTH is characterized by variable tissue hyposensitivity to thyroid hormones.
  • RTHβ results from mutations in the thyroid hormone receptor β gene (THRB), while RTHα is caused by mutations in the thyroid hormone receptor α gene (THRA).

Purpose of the Study:

  • To provide a comprehensive overview of the clinical, biochemical, and genetic features of RTHα and RTHβ.
  • To highlight key diagnostic and therapeutic considerations for patients and families affected by these conditions.
  • To differentiate the distinct clinical presentations and genetic underpinnings of RTHα and RTHβ.

Main Methods:

  • Literature review of clinical, biochemical, and genetic studies on RTHα and RTHβ.
  • Analysis of patient phenotypes associated with THRB and THRA mutations.
  • Synthesis of current knowledge on diagnosis, treatment, and genetic counseling.

Main Results:

  • RTHβ is characterized by goiter, sinus tachycardia, and ADHD, with elevated thyroid hormone levels and non-suppressed TSH.
  • RTHα presents with variable mental retardation, short stature, constipation, and bradycardia.
  • Distinct clinical phenotypes correlate with mutations in THRB (RTHβ) versus THRA (RTHα).

Conclusions:

  • RTHα and RTHβ are distinct genetic disorders with unique clinical manifestations and underlying genetic causes.
  • Accurate diagnosis requires integrating clinical, biochemical, and genetic findings.
  • Understanding these aspects is crucial for effective patient management and family counseling.