Chymotrypsin C (CTRC) variants that diminish activity or secretion are associated with chronic pancreatitis

Jonas Rosendahl, Heiko Witt, Richárd Szmola, Eesh Bhatia, Béla Ózsvári, Olfert Landt, Hans Ulrich Schulz, Thomas M. Gress, Roland Pfützer, Matthias Löhr, Peter Kovacs, Matthias Blüher, Michael Stumvoll, Gourdas Choudhuri, Péter Hegyi, René H.M. Te Morsche, Joost P.H. Drenth, Kaspar Truninger, Milan Macek, Gero PuhlUlrike Witt, Hartmut Schmidt, Carsten Büning, Johann Ockenga, Andreas Kage, David Alexander Groneberg, Renate Nickel, Thomas Berg, Bertram Wiedenmann, Hans Bödeker, Volker Keim, Joachim Mössner, Niels Teich, Miklós Sahin-Tóth

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Abstract

Chronic pancreatitis is a persistent inflammatory disease of the pancreas, in which the digestive protease trypsin has a fundamental pathogenetic role. Here we have analyzed the gene encoding the trypsin-degrading enzyme chymotrypsin C (CTRC) in German subjects with idiopathic or hereditary chronic pancreatitis. Two alterations in this gene, p.R254W and p.K247_R254del, were significantly overrepresented in the pancreatitis group, being present in 30 of 901 (3.3%) affected individuals but only 21 of 2,804 (0.7%) controls (odds ratio (OR) = 4.6; confidence interval (CI) = 2.6-8.0; P = 1.3 × 10 -7). A replication study identified these two variants in 10 of 348 (2.9%) individuals with alcoholic chronic pancreatitis but only 3 of 432 (0.7%) subjects with alcoholic liver disease (OR = 4.2; CI = 1.2-15.5; P = 0.02). CTRC variants were also found in 10 of 71 (14.1%) Indian subjects with tropical pancreatitis but only 1 of 84 (1.2%) healthy controls (OR = 13.6; CI = 1.7-109.2; P = 0.0028). Functional analysis of the CTRC variants showed impaired activity and/or reduced secretion. The results indicate that loss-of-function alterations in CTRC predispose to pancreatitis by diminishing its protective trypsin-degrading activity.

Original languageEnglish
Pages (from-to)78-82
Number of pages5
JournalNature Genetics
Volume40
Issue number1
DOIs
StatePublished - Jan 2008
Externally publishedYes

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