Genome-wide association study of primary sclerosing cholangitis identifies new risk loci and quantifies the genetic relationship with inflammatory bowel disease
- PMID: 27992413
- PMCID: PMC5540332
- DOI: 10.1038/ng.3745
Genome-wide association study of primary sclerosing cholangitis identifies new risk loci and quantifies the genetic relationship with inflammatory bowel disease
Abstract
Primary sclerosing cholangitis (PSC) is a rare progressive disorder leading to bile duct destruction; ∼75% of patients have comorbid inflammatory bowel disease (IBD). We undertook the largest genome-wide association study of PSC (4,796 cases and 19,955 population controls) and identified four new genome-wide significant loci. The most associated SNP at one locus affects splicing and expression of UBASH3A, with the protective allele (C) predicted to cause nonstop-mediated mRNA decay and lower expression of UBASH3A. Further analyses based on common variants suggested that the genome-wide genetic correlation (rG) between PSC and ulcerative colitis (UC) (rG = 0.29) was significantly greater than that between PSC and Crohn's disease (CD) (rG = 0.04) (P = 2.55 × 10-15). UC and CD were genetically more similar to each other (rG = 0.56) than either was to PSC (P < 1.0 × 10-15). Our study represents a substantial advance in understanding of the genetics of PSC.
Conflict of interest statement
The authors declare no competing financial interests.
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Grants and funding
- RC4 AG039029/AG/NIA NIH HHS/United States
- U01 AG009740/AG/NIA NIH HHS/United States
- MR/L003120/1/MRC_/Medical Research Council/United Kingdom
- MC_PC_15018/MRC_/Medical Research Council/United Kingdom
- RP-PG-0310-1004/DH_/Department of Health/United Kingdom
- RG/09/012/28096/BHF_/British Heart Foundation/United Kingdom
- G0800270/MRC_/Medical Research Council/United Kingdom
- RP-PG-0310-1002/DH_/Department of Health/United Kingdom
- R01 DK084960/DK/NIDDK NIH HHS/United States
- RG/08/014/24067/BHF_/British Heart Foundation/United Kingdom
- RC2 AG036495/AG/NIA NIH HHS/United States
- WT_/Wellcome Trust/United Kingdom
