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Related Experiment Video

Updated: Jan 12, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Causal link between ankylosing spondylitis and thyroid dysfunction: A Mendelian randomization study.

Qingqing Ye1, Lin Liu2, Bing Liu1

  • 1Department of Orthopedics, Yibin Hospital of Traditional Chinese Medicine, Yibin, China.

Medicine
|November 5, 2025
PubMed
Summary

Ankylosing spondylitis (AS) may cause hyperthyroidism, but not hypothyroidism. This study found no evidence that thyroid dysfunction causes AS. Further research is needed to understand the mechanisms.

Keywords:
Mendelian randomizationankylosing spondylitiscausal relationshiphyperthyroidismhypothyroidism

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Area of Science:

  • Rheumatology
  • Endocrinology
  • Genetic Epidemiology

Background:

  • Ankylosing spondylitis (AS) and thyroid dysfunction are common conditions.
  • Observational studies suggest a link, but causality is uncertain.

Purpose of the Study:

  • To investigate the bidirectional causal relationship between AS and thyroid dysfunction using Mendelian randomization.

Main Methods:

  • Two-sample Mendelian randomization (MR) analysis.
  • Inverse variance weighted (IVW) and multivariate MR (MVMR) methods.
  • Sensitivity analyses to ensure result robustness.

Main Results:

  • Genetically predicted AS significantly increased hyperthyroidism risk.
  • No causal effect of AS on hypothyroidism was observed.
  • No evidence of a causal effect of thyroid dysfunction on AS.

Conclusions:

  • This study provides genetic evidence that AS causally influences hyperthyroidism risk.
  • No evidence supports a causal role for thyroid dysfunction in AS development or progression.
  • Further investigation into the underlying biological mechanisms is warranted.