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Association between hypothyroidism subtypes and major depression: A two-sample Mendelian randomization study.

Hongliang Zhou1, Haohao Zhu2, Jun Wang2

  • 1Department of Medical Psychology, The Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu, China.

Journal of Affective Disorders
|February 10, 2024
PubMed
Summary

Certain subtypes of hypothyroidism, including autoimmune hypothyroidism (HTCBSA) and levothyroxine purchases (HT/LP), may causally increase the risk of major depression (MD). Further research is needed to confirm these findings in diverse populations.

Keywords:
Causal relationshipHypothyroidismImmune responseMajor depressionMendelian randomization

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Area of Science:

  • Endocrinology
  • Psychiatry
  • Genetics

Background:

  • The causal link between hypothyroidism subtypes and major depression (MD) risk requires further clarification.
  • Understanding these relationships is crucial for comprehensive patient care and mental health management.

Purpose of the Study:

  • To investigate the potential causal relationship between various hypothyroidism subtypes and the risk of developing MD.
  • To identify specific hypothyroidism subtypes associated with an increased likelihood of MD.

Main Methods:

  • A two-sample Mendelian Randomization (MR) approach was employed.
  • Genome-Wide Association Study (GWAS) summary statistics were utilized from large-scale datasets (FinnGen, UK Biobank).
  • Single nucleotide polymorphisms (SNPs) served as instrumental variables to assess causality.

Main Results:

  • "Hypothyroidism, strict autoimmune" (HTCBSA) and "Hypothyroidism, levothyroxin purchases" (HT/LP) showed a significant positive causal association with MD risk.
  • Odds ratios for HTCBSA and HT/LP were 1.020 and 1.022, respectively.
  • Sensitivity analyses confirmed the robustness of these findings, ruling out significant horizontal pleiotropy.

Conclusions:

  • This MR study indicates a potential causal link between specific hypothyroidism subtypes (HTCBSA, HT/LP) and an elevated risk of major depression.
  • The findings highlight the importance of considering thyroid health in the context of mental well-being.