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Polymorphisms at PRSS1–PRSS2 and CLDN2–MORC4 Loci Associate

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Polymorphisms at PRSS1–PRSS2 and CLDN2–MORC4 Loci Associate Downloaded from http://gut.bmj.com/ on December 18, 2017 - Published by group.bmj.com Pancreas ORIGINAL ARTICLE Polymorphisms at PRSS1–PRSS2 and CLDN2–MORC4 loci associate with alcoholic and non-alcoholic chronic pancreatitis in a European replication study Monique H Derikx,1,* Peter Kovacs,2,* Markus Scholz,3,4,* Emmanuelle Masson,5,6,7,8 Jian-Min Chen,5,6,7,8 Claudia Ruffert,9,* Peter Lichtner,10,* Rene H M te Morsche,1,* Giulia Martina Cavestro,11,* PanEuropean Working group on Alcoholic Chronic Pancreatitis members and collaborators,† Claude Férec,5,6,7,8 Joost P H Drenth,1,* Heiko Witt,12,* Jonas Rosendahl9,* ▸ Additional material is ABSTRACT published online only. To view Objective Several genetic risk factors have been Significance of this study please visit the journal online fi (http://dx.doi.org/10.1136/ identi ed for non-alcoholic chronic pancreatitis (NACP). gutjnl-2014-307453). A genome-wide association study reported an fi association of chronic pancreatitis (CP) with variants in What is already known on this subject? For numbered af liations see – end of article. PRSS1 PRSS2 (rs10273639; near the gene encoding ▸ Genetic associations for non-alcoholic chronic cationic trypsinogen) and CLDN2–MORC4 loci pancreatitis (NACP) in PRSS1, PRSS2, CFTR, Correspondence to (rs7057398 in RIPPLY1 and rs12688220 in MORC4). SPINK1, CTRC and CPA1, as well as a Dr Jonas Rosendahl, We aimed to refine these findings in a large European gene-dosage effect of PRSS1-PRSS2 locus have Department of Internal fi Medicine, Neurology and cohort. been identi ed. Dermatology, Division of Design We studied 3062 patients with alcohol-related ▸ Alcohol misuse is the predominant cause of Gastroenterology and CP (ACP) or NACP and 5107 controls. Also, 1559 chronic pancreatitis (CP); however, only Rheumatology, University Clinic German patients with alcohol-associated cirrhosis or 3%–5% of alcohol misusers develop the of Leipzig, Liebigstraße 20, alcohol dependence were included for comparison. We disease. This implicates genetic susceptibility Leipzig 04103, Germany; – [email protected] performed several meta-analyses to examine genotype factors, which have not been elucidated so far. leipzig.de phenotype relationships. ▸ A recent genome-wide association study Results Association with ACP was found for (GWAS) reported PRSS1–PRSS2 and CLDN2– *Members of the PanEuropean rs10273639 (OR, 0.63; 95% CI 0.55 to 0.72). ACP was MORC4 Working group on Alcoholic locus variants that affect risk for CP, Chronic Pancreatitis. also associated with variants rs7057398 and and the data have not been replicated up to rs12688220 in men (OR, 2.26; 95% CI 1.94 to 2.63 now. †Names and affiliations of the and OR, 2.66; 95% CI 2.21 to 3.21, respectively) and in rest of the co-authors are listed women (OR, 1.57; 95% CI 1.14 to 2.18 and OR 1.71; What are the new findings? at the end of the manuscript. 95% CI 1.41 to 2.07, respectively). Similar results were ▸ This study in a large European cohort replicates obtained when German patients with ACP were and refines the impact of PRSS1-PRSS2 and MHD, PK, MS, EM, CF, JPHD CLDN2 MORC4 and HW contributed equally. compared with those with alcohol-associated cirrhosis or - locus variants as susceptibility alcohol dependence. In the overall population of patients factors predominantly in ACP. Received 11 April 2014 with NACP, association with rs10273639 was absent ▸ Variants at both loci are susceptibility factors Revised 18 August 2014 for ACP and not alcohol misuse per se Accepted 21 August 2014 (OR, 0.93; 95% CI 0.79 to 1.01), whereas rs7057398 Published Online First of the X chromosomal single nucleotide polymorphisms according to our comparison with alcohol- 24 September 2014 was associated with NACP in women only (OR, 1.32; dependent and patients with alcoholic liver 95% CI 1.15 to 1.51). cirrhosis. Conclusions The single-nucleotide polymorphisms ▸ Risk increase for the X chromosomal rs10273639 at the PRSS1–PRSS2 locus and rs7057398 CLDN2-MORC4 locus is comparable in men and and rs12688220 at the CLDN2–MORC4 locus are women. As such this factor does not explain associated with CP and strongly associate with ACP, but any sex differences in disease susceptibility. only rs7057398 with NACP in female patients. How might it impact on clinical practice in the foreseeable future? ▸ The replication and refinement of the recently identified susceptibility variants justifies further INTRODUCTION studies on their functional properties. The genetic susceptibility to chronic pancreatitis (CP) ▸ By the identification of new pathways, new is best illustrated by the discovery of cationic tryp- strategies for influencing the clinical picture of PRSS1 To cite: Derikx MH, sinogen mutations ( HGNC:9475) in families NACP and ACP might be developed in the long Kovacs P, Scholz M, et al. with autosomal-dominant inherited pancreatitis.1 – term. Gut 2015;64:1426 1433. There is also strong evidence that genetic variants 1426 Derikx MH, et al. Gut 2015;64:1426–1433. doi:10.1136/gutjnl-2014-307453 Downloaded from http://gut.bmj.com/ on December 18, 2017 - Published by group.bmj.com Pancreas contribute to cases of CP without a clear inheritance pattern. We labelled patients with NACP in the absence of exogenous Indeed, idiopathic CP (ICP) is associated with genetic alterations factors such as alcohol. in CFTR (HGNC:1884), SPINK1 (HGNC:11244), PRSS2 ALC was diagnosed by a history of habitual ethanol intake (HGNC:9483), CTRC (HGNC:2523) and CPA1 (see ACP diagnosis above, duration at least 10 years), typical – (HGNC:2296).2 7 The association of genetic variants and disease findings in liver biopsy or clinical and laboratory findings indica- susceptibility is less clear for alcohol-related CP (ACP). There is a tive for liver disease. Such laboratory and clinical findings low enrichment of SPINK1 (p.N34S) and CTRC (p.R254W) included abnormal levels of aminotransferases, gamma glutamyl alleles in ACP populations, and no other consistent genetic risk transpeptidase, coagulation tests, serum albumin concentration, contributors have been described.58Similar to ICP,thePRSS2 platelet count, complications related to liver cirrhosis such as p.G191R variant protects against ACP development.2 All these oesophageal varices, ascites, hepatic encephalopathy and typical associations have been discovered through candidate-driven liver morphology in imaging studies. Other aetiologies of liver genetic association studies. cirrhosis were excluded by standard laboratory tests. A recent paper described a different approach and reported Patients with AD were recruited from psychiatric and addiction novel risk and protecting loci for CP identified through a medicine departments in different cities across southern and genome-wide association study (GWAS). A number of variants central Germany. AD was diagnosed per DSM-IV criteria by con- in the PRSS1–PRSS2 but also the CLDN2–MORC4 locus sensus of two clinical psychiatrists. All patients were of self- (Claudin 2; HGNC:2041; RIPPLY1, ripply transcriptional reported German ancestry and did not suffer from CP or ALC.16 repressor 1, HGNC:25117; MORC4, MORC family CW-type The study included 1866 patients (male, n=1567) with ACP zinc finger 4, HGNC:23485) were captured as risk factors for and 1196 patients (male, n=596) with NACP from different CP.9 This study investigated patients with different types of CP European countries. In addition, we enrolled 5107 controls as well as recurrent acute pancreatitis (RAP) and stratified indivi- (male, n=2287), 661 German patients with ALC (male, n=480) duals into alcohol-related and alcohol-unrelated pancreatitis and 898 Germans with AD (male, n=797). Characteristics of the groups. In a first screening cohort, three single nucleotide poly- patients and controls are summarised in table 1. More details of morphisms (SNPs) rs10273639 (in the PRSS1–PRSS2 locus on the controls are summarised in online supplementary table S1. chromosome 7, in perfect linkage disequilibrium with rs2011216 in intron 1 and rs6667 in exon 5 of PRSS1), Genotyping rs7057398 and rs12688220 (both in a new locus, CLDN2– Details of the methods used for genotyping are summarised in MORC4 on the X chromosome) reached genome-wide signifi- the online supplementary material. As quality controls, 3% of cance. After scrutiny, the PRSS1–PRSS2 rs10273639 T allele all samples were genotyped in duplicates blinded to the investi- appeared to protect against CP, whereas RIPPLY1 rs7057398 C gator. The concordance rate was >98%. Call rates for allele and MORC4 rs12688220 T allele increased disease suscep- rs10273639, rs7057398 and rs12688220 in the European tibility.9 There is some biological plausibility for the association samples were 99.1% (9641/9730), 99% (9636/9730) and with the PRSS1–PRSS2 locus as it may disturb the balance of 98.8% (9609/9730), respectively. pancreatic proteases and antiproteases in favour of the former.10 11 Claudin 2 represents a tight junction protein Statistical analysis involved in low-resistance cation-selective ion and water trans- Quality of SNP genotypes was assessed by study-wise call rate port between endothelial cells.12 13 One might speculate that and exact test for Hardy–Weinberg equilibrium in controls CLDN2–MORC4 locus variants lead to miss-localisation of pan- (female controls only for the X chromosomal SNPs). We also creatic CLDN2 that hampers its biological function. However, calculated overall statistics and performed stratified tests of this speculation warrants further experimental support. Hardy–Weinberg equilibrium according to Troendle and Yu.17 Prior to the design of experimental studies that focus on the According to these measures, genotype qualities were excellent biological role of these variants, it is crucial that GWAS results throughout. Study-wise genetic effects were determined by are replicated. This is needed to prove that results are valid and logistic regression analysis assuming an additive model of inher- reliable to determine generalisability and to better judge the itance.
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