Thyroid disease

Graves Disease and Inflammatory Bowel Disease: A Bidirectional Mendelian Randomization

J Clin Endocrinol MetabPublished Bidirectional 2-sample Mendelian randomization study

Authors' conclusion

Our study revealed a potentially higher comorbidity rate for GD and CD. However, UC might represent a protective factor for GD. The underlying mechanism and potential common pathways await discovery.

Study context

Population
GWAS summary data from Biobank Japan and the International Inflammatory Bowel Disease Genetic Consortium
Comparison
Genetically predicted inflammatory bowel disease (IBD) vs Graves disease (GD)
Outcome
Causal relationship between GD and IBD
Methodological detailsGWAS summary data, random-effect inverse variance weighted, weighted median, MR-Egger regression, MR-PRESSO
  • GWAS summary data
  • Random-effect inverse variance weighted, weighted median, MR-Egger regression, MR-PRESSO

Main finding

As reported in the abstract

Risk of GD with genetically predicted IBD

Genetically predicted IBD may increase risk of GD by 24%: OR (95% CI), P

1.24

1.01–1.52P = .041

Further findings

Crohn disease (CD) and ulcerative colitis (UC) and risk of GD

CD may increase the risk of GD, whereas UC may prevent developing GD

Genetically predicted GD and risk of CD, UC or IBD

GD may slightly increase the risk of CD; evidence that GD increased the risk of UC or IBD was lacking

Outlier-corrected analysis

Outlier-corrected results were consistent with raw causal estimates

Original publication

Graves Disease and Inflammatory Bowel Disease: A Bidirectional Mendelian Randomization. J Clin Endocrinol Metab. Published 2 December 2022. doi:10.1210/clinem/dgac683

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