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# Genetic pancreatitis: PRSS1, SPINK1, CFTR and CTRC

- Mechanism

Some people inherit genes that let trypsin switch on too easily or stay active too long, so they get pancreatitis young and often.

Updated Nov 12, 2026

## Key points

- PRSS1 (cationic trypsinogen) gain of function: autosomal dominant hereditary pancreatitis, onset in childhood.
- SPINK1 loss: the pancreatic secretory trypsin inhibitor fails; modifies risk.
- CTRC loss: chymotrypsin C normally degrades trypsin.
- CFTR variants: thick, protein-rich, low-bicarbonate secretions plug ducts; mild variants cause pancreatitis without lung disease.
- Hereditary pancreatitis carries a markedly raised risk of pancreatic adenocarcinoma, higher in smokers.
- Chronic pancreatitis with stones in a child or young adult should prompt genetic testing.

## What it is

Genetic variants explain many cases of recurrent acute and chronic pancreatitis in young people. Most act on the balance of trypsin activity in the pancreas: gain-of-function changes in cationic trypsinogen (PRSS1) make trypsin resistant to inactivation; loss of the trypsin inhibitor SPINK1 or of chymotrypsin C (CTRC) removes safety brakes; CFTR variants thicken pancreatic secretions. Hereditary pancreatitis from PRSS1 is autosomal dominant and carries a high lifetime risk of pancreatic cancer.

## Step by step

- Small amounts of trypsinogen activate inside the pancreas every day.
- Normally SPINK1 binds the trypsin and CTRC and trypsin itself degrade it.
- PRSS1 mutations make trypsin resistant to this breakdown, or activate it more easily.
- SPINK1 or CTRC loss removes the safety brakes.
- Active trypsin persists and triggers repeated episodes of acute pancreatitis.
- Repeated injury leads to fibrosis, calcifications and chronic pancreatitis.

## Genes of hereditary and genetic pancreatitis

| Gene | Normal role | Effect of the variant | Inheritance |
| --- | --- | --- | --- |
| PRSS1 | Cationic trypsinogen | Gain of function: trypsin activates easily or resists inactivation | Autosomal dominant |
| SPINK1 | Trypsin inhibitor | Loss of the inhibitor | Modifier, often recessive or complex |
| CTRC | Chymotrypsin C, degrades trypsin | Loss of degradation | Modifier |
| CFTR | Chloride and bicarbonate channel of duct cells | Thick secretions, duct plugging | Autosomal recessive |

## Memory aid

One accelerator stuck on (PRSS1) and three brakes that can fail (SPINK1, CTRC, CFTR flushing).

## Test yourself

Think of the answer, then tap the question to see it.

## What kind of mutation in PRSS1 causes hereditary pancreatitis?

Gain-of-function mutations that make cationic trypsinogen activate easily or resist inactivation.

## What does SPINK1 normally do?

It encodes the pancreatic secretory trypsin inhibitor, which binds and blocks trypsin activated inside the pancreas.

## Which cancer risk is raised in hereditary pancreatitis?

Pancreatic ductal adenocarcinoma, especially in smokers.

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## Elsewhere in DurgiPedia

- [Exocrine pancreatic secretion](https://durgical.com/en/physiology/exocrine-pancreatic-secretion/)

## Connections

## Related 5

- [Acute pancreatitis: causes, and how trypsin starts self-digestion](https://durgical.com/en/general-pathology/acute-pancreatitis-causes-and-how-trypsin-starts-self-digestion/)
- [Chronic pancreatitis: fibrosis, ductal stones and lost acini](https://durgical.com/en/general-pathology/chronic-pancreatitis-fibrosis-ductal-stones-and-lost-acini/)
- [Pancreatic ductal adenocarcinoma](https://durgical.com/en/general-pathology/pancreatic-ductal-adenocarcinoma/)
- [Cystic fibrosis: from the CFTR channel to organ damage](https://durgical.com/en/general-pathology/cystic-fibrosis-from-the-cftr-channel-to-organ-damage/)
- [How a single gene causes disease: enzymes, receptors and structural proteins](https://durgical.com/en/general-pathology/how-a-single-gene-causes-disease-enzymes-receptors-and-structural-proteins/)

## Related conditions 4

- [Acute pancreatitis](https://durgical.com/en/conditions/acute-pancreatitis/)
- [Chronic pancreatitis](https://durgical.com/en/conditions/chronic-pancreatitis/)
- [Cystic fibrosis](https://durgical.com/en/conditions/cystic-fibrosis/)
- [Pancreatic cancer](https://durgical.com/en/conditions/pancreatic-cancer/)

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Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: [Hereditary pancreatitis: MedlinePlus Genetics](https://medlineplus.gov/genetics/condition/hereditary-pancreatitis/) (MedlinePlus, US National Library of Medicine, 2026); [Cystic fibrosis: MedlinePlus Genetics](https://medlineplus.gov/genetics/condition/cystic-fibrosis/) (MedlinePlus, US National Library of Medicine, 2026).

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Representative model, for educational purposes only.

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Source: https://durgical.com/en/general-pathology/genetic-pancreatitis-prss1-spink1-cftr-and-ctrc/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/general-pathology/genetic-pancreatitis-prss1-spink1-cftr-and-ctrc/