The SPINK in chronic pancreatitis: similar finds, different minds
- Kinderklinik, Charité-Campus Virchow-Klinikum, Humboldt-Universität, Augustenburger Platz 1, D-13353 Berlin, Germany; firstname.lastname@example.org
SPINK mutations are strongly associated with chronic pancreatitis but may not cause the disease
“Yet in each word some concept there must be.”
“Quite true! But don't torment yourself too anxiously;
For at the point where concepts fail,
At the right time a word is thrust in there.
With words we fitly can our foes assail,
With words a system we prepare,
Words we quite fitly can believe,
Nor from a word a mere iota thieve.”
Johann Wolfgang Goethe; Faust I
Approximately five decades ago it was recognised for the first time that chronic pancreatitis (CP) may cluster in selected families suggesting an inherited disorder in these patients.1 However, the underlying genetic defect remained obscure for a long time. The discovery of cationic trypsinogen (PRSS1) mutations in CP families provided a first clue to the underlying disease mechanisms.2 Subsequent studies revealed that PRSS1 mutations are also present in patients with idiopathic CP. Recently, mutations in the serine protease inhibitor, Kazal type 1 (SPINK1) gene, a pancreatic trypsin inhibitor, were identified as associated with idiopathic or hereditary CP: in 22 of 96 paediatric patients, a SPINK1 mutation was detected. In 18 patients, a substitution of asparagine by serine at codon 34 in exon 3 was found (N34S). Six patients were homozygous for this mutation.3 These findings suggest that pancreatitis may be the result of an imbalance of proteases and their inhibitors within the pancreatic parenchyma.
In this issue of Gut, Threadgold and coworkers4 and Drenth and colleagues5 describe mutational studies of SPINK1 in two large series with different types of chronic pancreatitis [see pages 675 and 682]. Threadgold et …