Defects of Thyroid Hormone Synthesis and Action

Area of Science:

• Endocrinology
• Genetics
• Pediatrics

Background:

• Congenital hypothyroidism (CH) is the most frequent inborn endocrine disorder, leading to substantial morbidity.
• The molecular basis for CH remains unidentified in a significant number of affected individuals.
• Improved understanding of CH pathophysiology is crucial for effective patient counseling and therapeutic advancements.

Purpose of the Study:

• To provide a concise overview of the pathophysiology and genetics of known CH causes.
• To highlight the genetic and molecular underpinnings of thyroid dysgenesis, dyshormonogenesis, and hormone resistance syndromes.

Main Methods:

• Literature review of congenital hypothyroidism.
• Analysis of genetic and molecular data related to thyroid development and function.
• Synthesis of information on known causes of CH.

Main Results:

• Identified known genetic and molecular causes for specific CH phenotypes.
• Outlined the pathophysiology of thyroid dysgenesis and dyshormonogenesis.
• Summarized the genetic basis for the syndrome of impaired thyroid hormone sensitivity.

Conclusions:

• Genetic and molecular insights into CH are essential for improving diagnosis and management.
• Further research is needed to elucidate the causes of CH in the remaining patient population.
• This review consolidates current knowledge on the genetic basis of CH, informing clinical practice and future research directions.