Genetic association between celiac disease and chronic kidney disease: a two-sample Mendelian randomization study.

Objective: A two-sample Mendelian randomization (MR) analysis was performed to elucidate the causal impact of celiac disease on the risk of chronic kidney disease (CKD).
Methods: The study comprised data from three genome-wide association studies involving individuals of European ancestry. The study groups included participants with celiac disease ( n  = 24,269), CKD ( n  = 117,165), and estimated glomerular filtration rate levels based on serum creatinine (eGFRcrea, n  = 133,413). We employed four widely recognized causal inference algorithms: MR-Egger, inverse variance weighted (IVW), weighted median, and weighted mode. To address potential issues related to pleiotropy and overall effects, MR-Egger regression and the MR-PRESSO global test were performed. Heterogeneity was assessed using Cochran's Q test.
Results: We identified 14 genetic variants with genome-wide significance. The MR analysis provided consistent evidence across the various methodologies, supporting a causal relationship between celiac disease and an elevated risk of CKD (odds ratio (OR) _IVW = 1.027, p  = 0.025; OR _{weighted median} = 1.028, P  = 0.049; OR _{weighted mode} = 1.030, p  = 0.044). Furthermore, we observed a causal link between celiac disease and a decreased eGFRcrea (OR _IVW = 0.997, P  = 2.94E-06; OR _{weighted median} = 0.996, P  = 1.68E-05; OR _{weighted mode} = 0.996, P  = 3.11E-04; OR _{MR Egger} = 0.996, P  = 5.00E-03). We found no significant evidence of horizontal pleiotropy, heterogeneity, or bias based on MR-Egger regression, MR-PRESSO, and Cochran's Q test.
Conclusion: The results of this study indicate a causal relationship between celiac disease and an increased risk of CKD.