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Related Concept Videos

Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...

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Related Experiment Videos

Genetic evidence for causality between thyroid function and endometriosis: A bidirectional 2-sample Mendelian

Jiahuan Luo1,2, Ruopeng Zhang3,4, Mengjie Song2,5

  • 1Reproductive Center Obstetrics and Gynecology, Second Affiliated Hospital of Army Medical University, Chongqing, China.

Medicine
|July 11, 2026
PubMed
Summary

Thyroid function influences endometriosis development, particularly specific subtypes. This genetic study found no reverse causality from endometriosis to thyroid health.

Keywords:
Mendelian randomizationendometriosishyperthyroidismhypothyroidisminfertilitythyroid function

Related Experiment Videos

Area of Science:

  • Endocrinology
  • Reproductive Medicine
  • Genetics

Background:

  • Observational studies suggest a link between thyroid function and endometriosis.
  • The causal relationship between thyroid health and endometriosis remains unclear.
  • Endometriosis subtypes may have different associations with thyroid dysfunction.

Purpose of the Study:

  • To investigate the bidirectional causal relationship between thyroid function and endometriosis using Mendelian randomization.
  • To explore potential causal links between thyroid function and specific endometriosis subtypes.

Main Methods:

  • A bidirectional 2-sample Mendelian randomization (MR) analysis was performed.
  • Utilized summary genetic data from large consortia (ThyroidOmics, IEU, FinnGen).
  • Employed inverse variance weighted methods with sensitivity and subgroup analyses.

Main Results:

  • Genetically predicted free thyroxine (FT4) was negatively associated with total endometriosis.
  • Overt and subclinical hypothyroidism were negatively associated with endometriosis with infertility.
  • Subclinical hyperthyroidism and normal TSH levels showed associations with the uterine subtype of endometriosis.

Conclusions:

  • Thyroid function has a unidirectional causal effect on specific endometriosis phenotypes in Europeans.
  • No evidence of reverse causality from endometriosis to thyroid function was found.
  • Findings require replication in independent cohorts and prospective studies.