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Congenital hypothyroidism: etiology and pathogenesis

F Gentile1, S M Aloj

  • 1Centro di Endocrinologia e Oncologia Sperimentale, Consiglio Nazionale delle Ricerche, Università degli Studi Federico II, Naples, Italy.

Annali Dell'Istituto Superiore Di Sanita
|January 1, 1994
PubMed
Summary

Congenital hypothyroidism, often caused by thyroid development issues, requires early detection through screening to prevent irreversible consequences. Understanding inherited defects is crucial for managing this common endocrine disorder.

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Area of Science:

  • Endocrinology
  • Genetics
  • Pediatrics

Background:

  • Congenital hypothyroidism (CH) is a common endocrine disorder with potentially severe developmental consequences.
  • Most CH cases result from sporadic thyroid dysgenesis (ectopia, aplasia, hypoplasia).
  • Inherited defects in hormone synthesis, secretion, or action constitute a smaller but significant portion of CH etiologies.

Purpose of the Study:

  • To review the causes and molecular basis of congenital hypothyroidism.
  • To emphasize the importance of early diagnosis via newborn screening.
  • To highlight advances in understanding the genetic underpinnings of CH.

Main Methods:

  • Review of existing literature on congenital hypothyroidism.
  • Analysis of etiological factors, including genetic defects.

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  • Discussion of diagnostic approaches and molecular mechanisms.

    • Main Results:

    • Identified common causes (thyroid dysgenesis) and rarer inherited defects.
    • Highlighted transient causes like maternal drug exposure or iodine deficiency.
    • Elucidated molecular defects in conditions such as TSH receptor anomalies, thyroglobulin synthesis defects, thyroid peroxidase defects, generalized thyroid hormone resistance, and isolated TSH deficiency.

    Conclusions:

    • Early diagnosis of congenital hypothyroidism through mass screening is critical for preventing irreversible sequelae.
    • Molecular characterization of inherited defects is advancing our understanding of thyroid function.
    • Continued research into genetic mutations will further elucidate the molecular aspects of thyroid hormone regulation.