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Related Experiment Video

Updated: Feb 4, 2026

Author Spotlight: Accurately Assessing Thyroid Hormone-Driven Motor Alterations in Mouse
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Phenomic Impact of Genetically-Determined Euthyroid Function and Molecular Differences between Thyroid Disorders.

Silvia Ravera1, Nancy Carrasco2, Joel Gelernter3,4

  • 1Department of Cellular and Molecular Physiology, Yale School of Medicine, New Haven, CT 06510, USA. silvia.ravera@yale.edu.

Journal of Clinical Medicine
|September 26, 2018
PubMed
Summary

Genetically determined thyroid function influences numerous traits, including hypothyroidism, height, and body fat. This study also reveals shared immune pathways between hypothyroidism and hyperthyroidism.

Keywords:
Mendelian randomizationcausalityfree thyroxinethyroid glandthyrotropin

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Area of Science:

  • Endocrinology
  • Genetics
  • Human Physiology

Background:

  • The thyroid gland is crucial for development and homeostasis.
  • Establishing causality between thyroid function and diseases is challenging due to confounders.

Purpose of the Study:

  • To determine the causal effect of euthyroid function on various traits.
  • To investigate molecular differences between hypothyroidism and hyperthyroidism.

Main Methods:

  • A two-sample Mendelian randomization study.
  • Utilized UK Biobank data from 337,199 individuals.
  • Analyzed genome-wide data for hypothyroidism and hyperthyroidism.

Main Results:

  • Genetically determined thyrotropin (TSH) levels causally affect sixteen traits, including hypothyroidism, height, body fat distribution, pulse rate, female infertility, and hearing aid use.
  • A significant genetic correlation exists between hypothyroidism and hyperthyroidism, sharing immune pathways.
  • Specific molecular pathways (JAK/STAT signaling, Rac guanyl-nucleotide exchange factor activity) are associated with hyperthyroidism.

Conclusions:

  • Provides novel insights into euthyroid function variability.
  • Elucidates molecular mechanisms underlying hypothyroidism and hyperthyroidism.