Rosendahl J

References (4)

Title : Characterization of CEL-DUP2: Complete duplication of the carboxyl ester lipase gene is unlikely to influence risk of chronic pancreatitis - Fjeld_2020_Pancreatology__
Author(s) : Fjeld K , Masson E , Lin JH , Michl P , Stokowy T , Gravdal A , El Jellas K , Steine SJ , Hoem D , Johansson BB , Dalva M , Ruffert C , Zou WB , Li ZS , Njolstad PR , Chen JM , Liao Z , Johansson S , Rosendahl J , Ferec C , Molven A
Ref : Pancreatology , : , 2020
Abstract : BACKGROUND/OBJECTIVES: Carboxyl ester lipase is a pancreatic enzyme encoded by CEL, an extremely polymorphic human gene. Pathogenic variants of CEL either increases the risk for chronic pancreatitis (CP) or cause MODY8, a syndrome of pancreatic exocrine and endocrine dysfunction. Here, we aimed to characterize a novel duplication allele of CEL (CEL-DUP2) and to investigate whether it associates with CP or pancreatic cancer. METHODS: The structure of CEL-DUP2 was determined by a combination of Sanger sequencing, DNA fragment analysis, multiplex ligation-dependent probe amplification and whole-genome sequencing. We developed assays for screening of CEL-DUP2 and analyzed cohorts of idiopathic CP, alcoholic CP and pancreatic cancer. CEL protein expression was analyzed by immunohistochemistry. RESULTS: CEL-DUP2 consists of an extra copy of the complete CEL gene. The allele has probably arisen from non-allelic, homologous recombination involving the adjacent pseudogene of CEL. We found no association between CEL-DUP2 carrier frequency and CP in cohorts from France (cases/controls: 2.5%/2.4%; P = 1.0), China (10.3%/8.1%; P = 0.08) or Germany (1.6%/2.3%; P = 0.62). Similarly, no association with disease was observed in alcohol-induced pancreatitis (Germany: 3.2%/2.3%; P = 0.51) or pancreatic cancer (Norway; 2.5%/3.2%; P = 0.77). Notably, the carrier frequency of CEL-DUP2 was more than three-fold higher in Chinese compared with Europeans. CEL protein expression was similar in tissues from CEL-DUP2 carriers and controls. CONCLUSIONS: Our results support the contention that the number of CEL alleles does not influence the risk of pancreatic exocrine disease. Rather, the pathogenic CEL variants identified so far involve exon 11 sequence changes that substantially alter the protein's tail region.
ESTHER : Fjeld_2020_Pancreatology__
PubMedSearch : Fjeld_2020_Pancreatology__
PubMedID: 32007358

Title : Protease-Sensitive Pancreatic Lipase Variants Are Associated With Early Onset Chronic Pancreatitis - Lasher_2019_Am.J.Gastroenterol_114_974
Author(s) : Lasher D , Szabo A , Masamune A , Chen JM , Xiao X , Whitcomb DC , Barmada MM , Ewers M , Ruffert C , Paliwal S , Issarapu P , Bhaskar S , Mani KR , Chandak GR , Laumen H , Masson E , Kume K , Hamada S , Nakano E , Seltsam K , Bugert P , Muller T , Groneberg DA , Shimosegawa T , Rosendahl J , Ferec C , Lowe ME , Witt H , Sahin-Toth M
Ref : Am J Gastroenterol , 114 :974 , 2019
Abstract : OBJECTIVES: Premature activation of the digestive protease trypsin within the pancreatic parenchyma is a critical factor in the pathogenesis of pancreatitis. Alterations in genes that affect intrapancreatic trypsin activity are associated with chronic pancreatitis (CP). Recently, carboxyl ester lipase emerged as a trypsin-independent risk gene. Here, we evaluated pancreatic lipase (PNLIP) as a potential novel susceptibility gene for CP. METHODS: We analyzed all 13 PNLIP exons in 429 nonalcoholic patients with CP and 600 control subjects from Germany, in 632 patients and 957 controls from France, and in 223 patients and 1,070 controls from Japan by DNA sequencing. Additionally, we analyzed selected exons in further 545 patients with CP and 1,849 controls originating from Germany, United States, and India. We assessed the cellular secretion, lipase activity, and proteolytic stability of recombinant PNLIP variants. RESULTS: In the German discovery cohort, 8/429 (1.9%) patients and 2/600 (0.3%) controls carried a PNLIP missense variant (P = 0.02, odds ratio [OR] = 5.7, 95% confidence interval [CI] = 1.1-38.9). Variants detected in patients were prone to proteolytic degradation by trypsin and chymotrypsin. In the French replication cohort, protease-sensitive variants were also enriched in patients with early-onset CP (5/632 [0.8%]) vs controls (1/957 [0.1%]) (P = 0.04, OR = 7.6, 95% CI = 0.9-172.9). In contrast, we detected no protease-sensitive variants in the non-European populations. In the combined European data, protease-sensitive variants were found in 13/1,163 cases (1.1%) and in 3/3,000 controls (0.1%) (OR = 11.3, 95% CI = 3.0-49.9, P < 0.0001). CONCLUSIONS: Our data indicate that protease-sensitive PNLIP variants are novel genetic risk factors for the development of CP.
ESTHER : Lasher_2019_Am.J.Gastroenterol_114_974
PubMedSearch : Lasher_2019_Am.J.Gastroenterol_114_974
PubMedID: 30789418
Gene_locus related to this paper: human-PNLIP

Title : Genetic variants of lipase activity in chronic pancreatitis -
Author(s) : Kirsten H , Scholz M , Kovacs P , Grallert H , Peters A , Strauch K , Frank J , Rietschel M , Nothen MM , Witt H , Rosendahl J
Ref : Gut , 65 :184 , 2016
PubMedID: 25814649

Title : A recombined allele of the lipase gene CEL and its pseudogene CELP confers susceptibility to chronic pancreatitis - Fjeld_2015_Nat.Genet_47_518
Author(s) : Fjeld K , Weiss FU , Lasher D , Rosendahl J , Chen JM , Johansson BB , Kirsten H , Ruffert C , Masson E , Steine SJ , Bugert P , Cnop M , Grutzmann R , Mayerle J , Mossner J , Ringdal M , Schulz HU , Sendler M , Simon P , Sztromwasser P , Torsvik J , Scholz M , Tjora E , Ferec C , Witt H , Lerch MM , Njolstad PR , Johansson S , Molven A
Ref : Nat Genet , 47 :518 , 2015
Abstract : Carboxyl ester lipase is a digestive pancreatic enzyme encoded by the CEL gene. Mutations in CEL cause maturity-onset diabetes of the young as well as pancreatic exocrine dysfunction. Here we describe a hybrid allele (CEL-HYB) originating from a crossover between CEL and its neighboring pseudogene, CELP. In a discovery series of familial chronic pancreatitis cases, we observed CEL-HYB in 14.1% (10/71) of cases compared to 1.0% (5/478) of controls (odds ratio (OR) = 15.5; 95% confidence interval (CI) = 5.1-46.9; P = 1.3 x 10(-6) by two-tailed Fisher's exact test). In three replication studies of nonalcoholic chronic pancreatitis, we identified CEL-HYB in a total of 3.7% (42/1,122) cases and 0.7% (30/4,152) controls (OR = 5.2; 95% CI = 3.2-8.5; P = 1.2 x 10(-11); formal meta-analysis). The allele was also enriched in alcoholic chronic pancreatitis. Expression of CEL-HYB in cellular models showed reduced lipolytic activity, impaired secretion, prominent intracellular accumulation and induced autophagy. These findings implicate a new pathway distinct from the protease-antiprotease system of pancreatic acinar cells in chronic pancreatitis.
ESTHER : Fjeld_2015_Nat.Genet_47_518
PubMedSearch : Fjeld_2015_Nat.Genet_47_518
PubMedID: 25774637