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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Thyroid Function and Mood Disorders: A Mendelian Randomization Study.

Aleksander Kuś1,2,3, Alisa D Kjaergaard4, Eirini Marouli5,6

  • 1Department of Internal Medicine, Academic Center for Thyroid Diseases, Erasmus Medical Center, Rotterdam, The Netherlands.

Thyroid : Official Journal of the American Thyroid Association
|April 26, 2021
PubMed
Summary
This summary is machine-generated.

Minor thyroid function variations (thyrotropin and free thyroxine) do not causally impact major depressive disorder risk. Borderline associations suggest further study on thyroid hormone treatment for bipolar disorder.

Keywords:
Mendelian randomization studybipolar disorderdepressionmood disordersnormal-range thyroid functionthyroid

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Area of Science:

  • Endocrinology
  • Psychiatry
  • Genetics

Background:

  • Observational studies link thyroid function variations to mood disorders like major depressive disorder (MDD) and bipolar disorder (BD).
  • The causal relationship between minor thyroid function variations and mood disorders remains unclear.

Purpose of the Study:

  • To investigate the causal effects of normal-range thyrotropin (TSH) and free thyroxine (fT4) levels on the risk of MDD and BD using Mendelian randomization.
  • To explore potential reverse causality, examining the impact of MDD and BD on TSH and fT4 levels.

Main Methods:

  • Two-sample Mendelian randomization (MR) analyses were conducted.
  • Utilized large-scale genome-wide association study data for TSH, fT4, MDD, and BD.
  • Secondary analyses assessed subtype risks and performed reverse MR.

Main Results:

  • No causal association was found between genetically predicted TSH or fT4 levels and the risk of MDD, its subtypes, or minor depressive symptoms.
  • A nominal association indicated that increased fT4 levels might decrease overall BD risk (OR=0.89) and BD type 1 risk (OR=0.87).
  • Reverse MR showed no genetic predisposition of MDD or BD influencing TSH or fT4 levels.

Conclusions:

  • Normal-range variations in TSH and fT4 levels do not causally affect MDD risk or minor depressive symptoms.
  • The findings suggest that depressive symptoms should not be attributed to minor thyroid function variations.
  • Borderline associations with BD warrant further clinical investigation into thyroid hormone treatment for bipolar disorder.