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- Rosendahl, J, et al.
(författare)
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Genome-wide association study identifies inversion in the CTRB1-CTRB2 locus to modify risk for alcoholic and non-alcoholic chronic pancreatitis
- 2018
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Ingår i: Gut. - : BMJ. - 1468-3288 .- 0017-5749. ; 67:10, s. 1855-1863
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Tidskriftsartikel (refereegranskat)abstract
- Alcohol-related pancreatitis is associated with a disproportionately large number of hospitalisations among GI disorders. Despite its clinical importance, genetic susceptibility to alcoholic chronic pancreatitis (CP) is poorly characterised. To identify risk genes for alcoholic CP and to evaluate their relevance in non-alcoholic CP, we performed a genome-wide association study and functional characterisation of a new pancreatitis locus.Design1959 European alcoholic CP patients and population-based controls from the KORA, LIFE and INCIPE studies (n=4708) as well as chronic alcoholics from the GESGA consortium (n=1332) were screened with Illumina technology. For replication, three European cohorts comprising 1650 patients with non-alcoholic CP and 6695 controls originating from the same countries were used.ResultsWe replicated previously reported risk loci CLDN2-MORC4, CTRC, PRSS1-PRSS2 and SPINK1 in alcoholic CP patients. We identified CTRB1-CTRB2 (chymotrypsin B1 and B2) as a new risk locus with lead single-nucleotide polymorphism (SNP) rs8055167 (OR 1.35, 95% CI 1.23 to 1.6). We found that a 16.6 kb inversion in the CTRB1-CTRB2 locus was in linkage disequilibrium with the CP-associated SNPs and was best tagged by rs8048956. The association was replicated in three independent European non-alcoholic CP cohorts of 1650 patients and 6695 controls (OR 1.62, 95% CI 1.42 to 1.86). The inversion changes the expression ratio of the CTRB1 and CTRB2 isoforms and thereby affects protective trypsinogen degradation and ultimately pancreatitis risk.ConclusionAn inversion in the CTRB1-CTRB2 locus modifies risk for alcoholic and non-alcoholic CP indicating that common pathomechanisms are involved in these inflammatory disorders.
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| 2. |
- Milano, M., et al.
(författare)
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Transmembrane 6 superfamily member 2 gene E167K variant impacts on steatosis and liver damage in chronic hepatitis C patients
- 2015
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Ingår i: Hepatology. - : Ovid Technologies (Wolters Kluwer Health). - 0270-9139 .- 1527-3350. ; 62:1, s. 111-117
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Tidskriftsartikel (refereegranskat)abstract
- Steatosis and inherited host factors influence liver damage progression in chronic hepatitis C (CHC). The transmembrane 6 superfamily member 2 (TM6SF2) gene E167K variant increases liver fat and risk of progressive steatohepatitis by interfering with lipoprotein secretion. Our aim was to determine whether the E167K variant affects histological severity of steatosis, necroinflammation, and fibrosis in a cross-sectional cohort of 815 Italian therapy-naive CHC patients. The association with clinically significant fibrosis was replicated in 645 Swiss/German patients. The TM6SF2 E167K variant was genotyped by TaqMan assays, steatosis graded according to the nonalcoholic fatty liver disease activity score, and necroinflammation and fibrosis graded and staged according to Ishak in Italian, and to Metavir in Swiss/German patients. The E167K variant was detected in 69 (9%) Italian patients and was associated with more severe steatosis, independently of confounders (P=0.038). The association between E167K and steatosis severity was present in patients not infected by genotype 3 (G3) HCV (P=0.031), but not in those infected by G3 HCV (P=0.58). Furthermore, the E167K variant was associated with more severe necroinflammation (Ishak grade; adjusted P=0.037) and nearly associated with more severe fibrosis (Ishak stage; adjusted P=0.058). At multivariate logistic regression analysis, the E167K variant was independently associated with histologically probable or definite cirrhosis (Ishak stage S6; odds ratio [OR]: 2.19; 95% confidence interval [CI]: 1.18-3.93; P=0.010). After further conditioning for steatosis and necroinflammation, the E167K variant remained associated with cirrhosis (OR, 3.15; 95% CI: 1.60-5.99; P<0.001). In Swiss/German patients, the E167K variant was independently associated with clinically significant fibrosis Metavir stage F2-F4 (OR, 1.81; 95% CI: 1.12-3.02; P=0.016). Conclusion: TM6SF2 E167K variant impacts on steatosis severity and is associated with liver damage and fibrosis in patients with CHC. (Hepatology 2015;62:111-117)
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