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Related Experiment Videos

Gonadotrophin receptors

R N Clayton1

  • 1School of Postgraduate Medicine, Keele University, Hartshill, Stoke-on-Trent, UK.

Bailliere'S Clinical Endocrinology and Metabolism
|January 1, 1996
PubMed
Summary

Activating mutations in the luteinizing hormone (LH) receptor cause familial male precocious puberty (FMPP). Studies of these mutations reveal insights into LH receptor function and related endocrine disorders.

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Area of Science:

  • Endocrinology
  • Molecular Genetics
  • Reproductive Biology

Background:

  • Precocious puberty can be gonadotrophin-dependent or independent, with the latter involving normal gonadotrophin levels but elevated sex steroids.
  • Familial male precocious puberty (FMPP) is a form of gonadotrophin-independent precocious puberty often caused by mutations in the LH receptor.
  • The LH receptor, a G protein-coupled receptor, plays a crucial role in steroidogenesis.

Purpose of the Study:

  • To investigate the role of LH receptor mutations in gonadotrophin-independent precocious puberty.
  • To elucidate the structure-function relationships of the LH receptor through naturally occurring mutations.
  • To understand the molecular mechanisms underlying constitutive receptor activation and its clinical consequences.

Main Methods:

  • Analysis of naturally occurring mutations in the LH receptor gene from patients with FMPP and related disorders.
  • In vitro studies recreating identified mutations to assess their impact on receptor activity and steroidogenesis.
  • Comparison of activating mutations in the LH receptor with those in other signaling proteins like Gs alpha.

Main Results:

  • Activating mutations in the LH receptor, particularly in the sixth transmembrane domain, lead to constitutive activation of the cAMP pathway and testosterone overproduction.
  • Inactivating mutations in the LH receptor cause male pseudohermaphroditism with hypergonadotrophic hypogonadism.
  • Mutations in the Gs alpha subunit are associated with McCune-Albright syndrome and other endocrine tumors.

Conclusions:

  • LH receptor mutations are a significant cause of gonadotrophin-independent precocious puberty and provide insights into receptor signaling.
  • These 'experiments of nature' confirm the pathogenic role of specific LH receptor mutations through in vitro validation.
  • Further research is anticipated to identify similar mutations in the FSH receptor.

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