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A degradation-sensitive anionic trypsinogen (PRSS2) variant protects against chronic pancreatitis
Heiko Witt1, Miklós Sahin-Tóth, Olfert Landt
1Department of Hepatology and Gastroenterology, Charité University Hospital, Augustenburger Platz 1, 13353 Berlin, Germany. heiko.witt@charite.de
A specific variant in the PRSS2 gene (G191R) protects against chronic pancreatitis by reducing pancreatic enzyme activity. This finding offers new insights into the genetic factors influencing this inflammatory disease.
Area of Science:
- Genetics
- Gastroenterology
- Biochemistry
Background:
- Chronic pancreatitis is a common inflammatory pancreatic disease.
- Mutations in PRSS1 and SPINK1 genes are linked to chronic pancreatitis.
- Increased trypsinogen activity is a known risk factor.
Purpose of the Study:
- To investigate the role of anionic trypsinogen (PRSS2) gene variants in chronic pancreatitis.
- To determine if PRSS2 mutations predispose individuals to the disease.
Main Methods:
- Analysis of PRSS2 gene in patients with chronic pancreatitis and healthy controls.
- Genotyping for the codon 191 variant (G191R).
- Biochemical assays of recombinant G191R protein activity.
Main Results:
- The G191R variant was significantly less frequent in chronic pancreatitis patients compared to controls (1.3% vs 3.4%).
- The G191R variant demonstrated a complete loss of trypsin activity upon activation.
- This loss of activity is due to hypersensitivity to autocatalytic proteolysis.
Conclusions:
- The G191R variant of PRSS2 mitigates intrapancreatic trypsin activity.
- This protective effect suggests PRSS2 G191R guards against the development of chronic pancreatitis.
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