Nephrology (Carlton, Vic.) · 2024
Assessment of the causal relationship between inflammatory bowel diseases and chronic kidney diseases: A two-sample bidirectional mendelian randomization study among European population.
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Li Xingxing, Ge Qiaoyue, Yu Chuan, Zhao Wenting, Wu Chenxin, Liu Zhenmi, Meng Xiandong, Xiao Chenghan
Аннотация
BACKGROUND: Kidney function can be impaired in patients with inflammatory bowel diseases (IBD), including Crohn's diseases (CD) and ulcerative colitis (UC). However, the causal relationship between IBD and chronic kidney diseases (CKD) remains unclear.
METHODS: We determined the causal association between IBD and CKD by performing two-sample bidirectional mendelian randomization (MR) analyses. Independent genetic variants were selected as instrumental variables (IVs) of the exposure from open-access genome-wide association studies (GWAS) among European ancestry. IVs-outcome estimates were extracted from three separate GWAS for IBD and two for CKD, respectively. Inverse-variance-weighted model was used as the primary MR method. The pleiotropic effect and heterogeneity were evaluated. For either direction, analyses were performed per outcome database and were subsequently meta-analysed.
RESULTS: Genetically predicted IBD was associated with higher risk of CKD (OR: 1.045, 95% CI: 1.016-1.073, P = 0.002) by including 42 344 IBD cases and 229 164 controls. Further analyses showed genetic liability to CD increased the risk of CKD (OR: 1.057, 95% CI: 1.027-1.087, p < 0.001) whereas UC did not (OR: 0.999, 95% CI:0.969-1.031, p = 0.970). In contrast, genetically predicted CKD was not associated with IBD (OR: 1.010, 95% CI: 0.965-1.056, p = 0.676), UC (OR: 1.011, 95% CI: 0.948-1.078, p = 0.746) and CD (OR: 1.024; 95% CI: 0.963-1.089, p = 0.447).
CONCLUSIONS: We concluded that CD, but not UC, can increase the risk of CKD causally. CD, but not UC, can increase the risk of chronic kidney disease causally. These findings enhance our understanding of the differential impact of IBD subtypes on CKD. It may be necessary to monitor kidney function regularly in patients with CD.
METHODS: We determined the causal association between IBD and CKD by performing two-sample bidirectional mendelian randomization (MR) analyses. Independent genetic variants were selected as instrumental variables (IVs) of the exposure from open-access genome-wide association studies (GWAS) among European ancestry. IVs-outcome estimates were extracted from three separate GWAS for IBD and two for CKD, respectively. Inverse-variance-weighted model was used as the primary MR method. The pleiotropic effect and heterogeneity were evaluated. For either direction, analyses were performed per outcome database and were subsequently meta-analysed.
RESULTS: Genetically predicted IBD was associated with higher risk of CKD (OR: 1.045, 95% CI: 1.016-1.073, P = 0.002) by including 42 344 IBD cases and 229 164 controls. Further analyses showed genetic liability to CD increased the risk of CKD (OR: 1.057, 95% CI: 1.027-1.087, p < 0.001) whereas UC did not (OR: 0.999, 95% CI:0.969-1.031, p = 0.970). In contrast, genetically predicted CKD was not associated with IBD (OR: 1.010, 95% CI: 0.965-1.056, p = 0.676), UC (OR: 1.011, 95% CI: 0.948-1.078, p = 0.746) and CD (OR: 1.024; 95% CI: 0.963-1.089, p = 0.447).
CONCLUSIONS: We concluded that CD, but not UC, can increase the risk of CKD causally. CD, but not UC, can increase the risk of chronic kidney disease causally. These findings enhance our understanding of the differential impact of IBD subtypes on CKD. It may be necessary to monitor kidney function regularly in patients with CD.