Intragenic duplication: A novel mutational mechanism in hereditary pancreatitis

Maiken T. Joergensen, Andrea Geisz, Klaus Brusgaard, Ove B. Schaffalitzky De Muckadell, P. Hegyi, Anne Marie Gerdes, Miklós Sahin-Tóth

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Objectives: In a hereditary pancreatitis family from Denmark, we identified a novel intragenic duplication of 9 nucleotides in exon-2 of the human cationic trypsinogen (PRSS1) gene (c.63-71dup) which at the amino-acid level resulted in the insertion of 3 amino acids within the activation peptide of cationic trypsinogen (p.K23-I24insIDK). The aim of the present study was to characterize the effect of this unique genetic alteration on the function of human cationic trypsinogen. Methods: Wild-type and mutant cationic trypsinogens were produced recombinantly and purified to homogeneity. Trypsinogen activation was followed by enzymatic assays and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Trypsinogen secretion was measured from transfected HEK 293T cells. Results: Recombinant cationic trypsinogen carrying the p.K23-I24insIDK mutation exhibited greater than 10-fold increased autoactivation. Activation by human cathepsin B also was accelerated by 10-fold. Secretion of the p.K23-I24insIDK mutant from transfected cells was diminished, consistent with intracellular autoactivation. Conclusions: This is the first report of an intragenic duplication within the PRSS1 gene causing hereditary pancreatitis. The accelerated activation of p.K23-I24insIDK by cathepsin B is a unique biochemical property not found in any other pancreatitis-associated trypsinogen mutant. In contrast, the robust autoactivation of the novel mutant confirms the notion that increased autoactivation is a disease-relevant mechanism in hereditary pancreatitis.

Original languageEnglish
Pages (from-to)540-546
Number of pages7
JournalPancreas.
Volume40
Issue number4
DOIs
Publication statusPublished - May 2011

Fingerprint

Trypsinogen
Cathepsin B
trypsinogen activation peptide
Aminoacylation
HEK293 Cells
Enzyme Assays
Denmark
Hereditary pancreatitis
Sodium Dodecyl Sulfate
Pancreatitis
Genes
Polyacrylamide Gel Electrophoresis
Exons
Nucleotides
Amino Acids
Mutation

Keywords

  • autoactivation
  • cathepsin B
  • enteropeptidase
  • Hereditary pancreatitis
  • human cationic trypsinogen
  • intragenic duplication
  • PRSS1

ASJC Scopus subject areas

  • Hepatology
  • Internal Medicine
  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Joergensen, M. T., Geisz, A., Brusgaard, K., Schaffalitzky De Muckadell, O. B., Hegyi, P., Gerdes, A. M., & Sahin-Tóth, M. (2011). Intragenic duplication: A novel mutational mechanism in hereditary pancreatitis. Pancreas., 40(4), 540-546. https://doi.org/10.1097/MPA.0b013e3182152fdf

Intragenic duplication : A novel mutational mechanism in hereditary pancreatitis. / Joergensen, Maiken T.; Geisz, Andrea; Brusgaard, Klaus; Schaffalitzky De Muckadell, Ove B.; Hegyi, P.; Gerdes, Anne Marie; Sahin-Tóth, Miklós.

In: Pancreas., Vol. 40, No. 4, 05.2011, p. 540-546.

Research output: Contribution to journalArticle

Joergensen, MT, Geisz, A, Brusgaard, K, Schaffalitzky De Muckadell, OB, Hegyi, P, Gerdes, AM & Sahin-Tóth, M 2011, 'Intragenic duplication: A novel mutational mechanism in hereditary pancreatitis', Pancreas., vol. 40, no. 4, pp. 540-546. https://doi.org/10.1097/MPA.0b013e3182152fdf
Joergensen MT, Geisz A, Brusgaard K, Schaffalitzky De Muckadell OB, Hegyi P, Gerdes AM et al. Intragenic duplication: A novel mutational mechanism in hereditary pancreatitis. Pancreas. 2011 May;40(4):540-546. https://doi.org/10.1097/MPA.0b013e3182152fdf
Joergensen, Maiken T. ; Geisz, Andrea ; Brusgaard, Klaus ; Schaffalitzky De Muckadell, Ove B. ; Hegyi, P. ; Gerdes, Anne Marie ; Sahin-Tóth, Miklós. / Intragenic duplication : A novel mutational mechanism in hereditary pancreatitis. In: Pancreas. 2011 ; Vol. 40, No. 4. pp. 540-546.
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