Type of inheritance in Wilson’s disease ?
First, the core concept is about hereditary patterns. The key here is understanding the mode of inheritance for Wilson's disease. Since it's autosomal recessive, affected individuals have two mutated alleles. Carriers have one and don't show symptoms. Now, the correct answer would be option C if the options are A: autosomal dominant, B: X-linked recessive, C: autosomal recessive, D: mitochondrial. But the user didn't list the options, so I need to assume standard ones.
Why is autosomal recessive correct? Because Wilson's disease is caused by mutations in both copies of the ATP7B gene. The protein it codes for is involved in copper excretion. Without functional ATP7B, copper accumulates in the liver and brain. So, the disease only manifests when both alleles are defective.
For the wrong options: Autosomal dominant would mean one copy is enough, but Wilson's is recessive. X-linked recessive would affect males more, but Wilson's affects both equally. Mitochondrial inheritance isn't the case here either.
Clinical pearl: Remember that Wilson's is AR, so genetic counseling for family members is important. Early diagnosis is key to prevent neurological and liver damage.
Need to structure the explanation with the required sections. Make sure each part is concise and covers the necessary points without being too verbose. Check for clarity and correct terminology. Also, ensure the clinical pearl is high-yield and memorable for exams.
**Core Concept**
Wilson’s disease is a **hereditary metabolic disorder** caused by mutations in the **ATP7B gene**, leading to impaired copper excretion. It follows an **autosomal recessive (AR) inheritance pattern**, meaning two defective alleles are required for disease manifestation.
**Why the Correct Answer is Right**
Wilson’s disease results from **loss-of-function mutations in ATP7B**, a copper-transporting ATPase in the liver. Biallelic mutations prevent copper incorporation into ceruloplasmin and its excretion into bile, causing hepatic and neurological damage. Autosomal recessive inheritance explains why carriers (heterozygotes) are asymptomatic and why consanguinity increases risk.
**Why Each Wrong Option is Incorrect**
**Option A: Autosomal dominant** – Incorrect. Dominant inheritance requires only one mutant allele, but Wilson’s disease needs two defective ATP7B alleles for clinical disease.
**Option B: X-linked recessive** – Incorrect. Wilson’s disease does not exhibit sex-linked inheritance; it affects males and females equally.
**Option D: Mitochondrial** – Incorrect. Mitochondrial inheritance involves maternal transmission only, which contradicts the autosomal recessive pattern seen in Wilson’s.
**Clinical Pearl / High-Yield Fact**
Remember **"AR Wilson"** (Autosomal Recessive Wilson’s) for exams. A **Kayser-Fleischer ring** (corneal copper deposition) and low cerul