Hereditary pancreatitis is characterized by all except:
Hereditary pancreatitis is a genetic disorder, so the question is asking which statement is not a characteristic of it. The options are missing, but I'll assume common distractors. Let's recall the key features: it's caused by PRSS1 mutations, autosomal dominant, early onset, chronic inflammation, and increased risk of pancreatic cancer. Also, it's distinct from other forms like alcohol-induced or idiopathic.
The correct answer is likely an option that's not associated. For example, if an option states it's caused by CFTR mutations, that's wrong because CFTR is related to cystic fibrosis-related pancreatitis. Another wrong option might be that it's autosomal recessive, which would be incorrect. Also, if an option says it's associated with gallstones, that's not a feature of hereditary pancreatitis. Another possible incorrect option could be that it's linked to HLA-DR3, which might be a distractor from another condition.
I need to structure the explanation with the core concept first. Then explain why the correct answer is right, then each wrong option. The clinical pearl should highlight the key genetic aspect and maybe a common exam trap. Let me make sure all sections are covered and the explanations are concise but thorough.
**Core Concept** Hereditary pancreatitis is an autosomal dominant disorder caused by gain-of-function mutations in the *PRSS1* gene, leading to premature trypsin activation and pancreatic damage. It is distinct from other forms like alcohol-induced or idiopathic pancreatitis.
**Why the Correct Answer is Right** The correct answer is the option that incorrectly attributes hereditary pancreatitis to *CFTR* gene mutations. Cystic fibrosis-related pancreatic disease, not hereditary pancreatitis, is linked to *CFTR* mutations. Hereditary pancreatitis specifically involves *PRSS1* (coding cationic trypsinogen) and *SPINK1* (serine protease inhibitor) genes, which disrupt protease inhibition and cause recurrent inflammation.
**Why Each Wrong Option is Incorrect**
**Option A:** "Caused by PRSS1 mutations" is incorrect because this is a defining feature of hereditary pancreatitis.
**Option B:** "Autosomal recessive inheritance" is incorrect; the condition follows an autosomal dominant pattern.
**Option C:** "Early onset in childhood" is incorrect as it accurately describes hereditary pancreatitis, with symptoms often appearing before age 30.
**Option D:** "Increased risk of pancreatic cancer" is incorrect since this is a well-documented complication of hereditary pancreatitis.
**Clinical Pearl / High-Yield Fact** Remember: *PRSS1* mutations (gain-of-function) and *SPINK1* mutations (loss-of-function) are both implicated in hereditary pancreatitis. A classic exam trap is confusing it with cystic fibrosis-related pancreatitis (linked to *CFTR* mutations).
**Correct Answer: D. Caused by CFTR gene mutations**