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Related Concept Videos

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...
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 II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase01:11

Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase

Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...

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Related Experiment Videos

Causal Association Between Thyroid Function and Myeloproliferative Disease: A Two-Sample Mendelian Randomization

Jingjing Xiang1, Jun Yan2, Jianping Shen1

  • 1Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Chinese Medicine), Hangzhou, Zhejiang, China, zjhtcm.com.

International Journal of Endocrinology
|June 29, 2026
PubMed
Summary
This summary is machine-generated.

This study found no strong evidence that thyroid function causally influences myeloproliferative diseases (MDs). Observed associations with hyperthyroidism were unstable and likely due to non-genetic factors.

Keywords:
Mendelian randomizationchronic myeloproliferative diseasehyperthyroidismmyeloproliferative diseasethyroid function

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Area of Science:

  • Genetics
  • Endocrinology
  • Hematology

Background:

  • Thyroid dysfunction is linked to blood abnormalities.
  • The causal role of thyroid function in myeloproliferative diseases (MDs) is unclear.

Purpose of the Study:

  • To investigate the potential causal effects of thyroid-related traits on MD risk using Mendelian randomization (MR).

Main Methods:

  • Two-sample MR analysis using GWAS summary statistics from the Finnish R12 cohort.
  • Genetic instruments for various thyroid traits (TSH, FT4, FT3, etc.) were selected at genome-wide significance.
  • Inverse-variance weighted (IVW) MR was primary, with sensitivity analyses including MR-Egger and MR-PRESSO.

Main Results:

  • Most thyroid function measures showed no causal association with chronic myeloproliferative disease (CMD) or MD (excluding CML).
  • A nominal association between hyperthyroidism and CMD was observed but was statistically unstable and did not survive correction.
  • Genetically predicted hyperthyroidism showed a nominal association with MD (excluding CML) after outlier removal, but this also failed FDR correction.

Conclusions:

  • No robust evidence supports a causal link between genetically predicted thyroid function and MD after multiple testing correction.
  • Nominal signals for hyperthyroidism were phenotype-dependent and statistically unstable, suggesting non-genetic factors or confounding.
  • The study highlights the need to consider non-genetic factors when interpreting associations between thyroid function and MDs.