Background & Aims: Genome-wide association studies in primary biliary cholangitis (PBC) have failed to find X chromosome (chrX) variants associated with the disease. Here, we specifically explore the chrX contribution to PBC, a sexually dimorphic complex autoimmune disease. Methods: We performed a chrX-wide association study, including genotype data from 5 genome-wide association studies (from Italy, United Kingdom, Canada, China, and Japan; 5244 case patients and 11,875 control individuals). Results: Single-marker association analyses found approximately 100 loci displaying P < 5 × 10–4, with the most significant being a signal within the OTUD5 gene (rs3027490; P = 4.80 × 10–6; odds ratio [OR], 1.39; 95% confidence interval [CI], 1.028–1.88; Japanese cohort). Although the transethnic meta-analysis evidenced only a suggestive signal (rs2239452, mapping within the PIM2 gene; OR, 1.17; 95% CI, 1.09–1.26; P = 9.93 × 10–8), the population-specific meta-analysis showed a genome-wide significant locus in East Asian individuals pointing to the same region (rs7059064, mapping within the GRIPAP1 gene; P = 6.2 × 10–9; OR, 1.33; 95% CI, 1.21–1.46). Indeed, rs7059064 tags a unique linkage disequilibrium block including 7 genes: TIMM17B, PQBP1, PIM2, SLC35A2, OTUD5, KCND1, and GRIPAP1, as well as a superenhancer (GH0XJ048933 within OTUD5) targeting all these genes. GH0XJ048933 is also predicted to target FOXP3, the main T-regulatory cell lineage specification factor. Consistently, OTUD5 and FOXP3 RNA levels were up-regulated in PBC case patients (1.75- and 1.64-fold, respectively). Conclusions: This work represents the first comprehensive study, to our knowledge, of the chrX contribution to the genetics of an autoimmune liver disease and shows a novel PBC-related genome-wide significant locus.

Asselta R., Paraboschi E.M., Gerussi A., Cordell H.J., Mells G.F., Sandford R.N., et al. (2021). X Chromosome Contribution to the Genetic Architecture of Primary Biliary Cholangitis. GASTROENTEROLOGY, 160(7), 2483-2495.e26 [10.1053/j.gastro.2021.02.061].

X Chromosome Contribution to the Genetic Architecture of Primary Biliary Cholangitis

Muratori L.;Muratori P.;Azzaroli F.
Investigation
;
2021

Abstract

Background & Aims: Genome-wide association studies in primary biliary cholangitis (PBC) have failed to find X chromosome (chrX) variants associated with the disease. Here, we specifically explore the chrX contribution to PBC, a sexually dimorphic complex autoimmune disease. Methods: We performed a chrX-wide association study, including genotype data from 5 genome-wide association studies (from Italy, United Kingdom, Canada, China, and Japan; 5244 case patients and 11,875 control individuals). Results: Single-marker association analyses found approximately 100 loci displaying P < 5 × 10–4, with the most significant being a signal within the OTUD5 gene (rs3027490; P = 4.80 × 10–6; odds ratio [OR], 1.39; 95% confidence interval [CI], 1.028–1.88; Japanese cohort). Although the transethnic meta-analysis evidenced only a suggestive signal (rs2239452, mapping within the PIM2 gene; OR, 1.17; 95% CI, 1.09–1.26; P = 9.93 × 10–8), the population-specific meta-analysis showed a genome-wide significant locus in East Asian individuals pointing to the same region (rs7059064, mapping within the GRIPAP1 gene; P = 6.2 × 10–9; OR, 1.33; 95% CI, 1.21–1.46). Indeed, rs7059064 tags a unique linkage disequilibrium block including 7 genes: TIMM17B, PQBP1, PIM2, SLC35A2, OTUD5, KCND1, and GRIPAP1, as well as a superenhancer (GH0XJ048933 within OTUD5) targeting all these genes. GH0XJ048933 is also predicted to target FOXP3, the main T-regulatory cell lineage specification factor. Consistently, OTUD5 and FOXP3 RNA levels were up-regulated in PBC case patients (1.75- and 1.64-fold, respectively). Conclusions: This work represents the first comprehensive study, to our knowledge, of the chrX contribution to the genetics of an autoimmune liver disease and shows a novel PBC-related genome-wide significant locus.
2021
Asselta R., Paraboschi E.M., Gerussi A., Cordell H.J., Mells G.F., Sandford R.N., et al. (2021). X Chromosome Contribution to the Genetic Architecture of Primary Biliary Cholangitis. GASTROENTEROLOGY, 160(7), 2483-2495.e26 [10.1053/j.gastro.2021.02.061].
Asselta R.; Paraboschi E.M.; Gerussi A.; Cordell H.J.; Mells G.F.; Sandford R.N.; Jones D.E.; Nakamura M.; Ueno K.; Hitomi Y.; Kawashima M.; Nishida N...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/829790
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