All are autosomal recessive coagulopathies except
**Core Concept**
Autosomal recessive coagulopathies are bleeding disorders caused by mutations in genes that are essential for blood coagulation, and they typically manifest in individuals who are homozygous recessive for the mutated gene. These conditions often have a variable clinical presentation, ranging from mild bleeding tendencies to severe and life-threatening bleeding episodes.
**Why the Correct Answer is Right**
The correct answer is a condition where the mutation affects the production of a crucial protein in the blood clotting cascade. This protein is involved in the intrinsic pathway of coagulation, which is activated when blood comes into contact with a foreign surface. The mutation leads to a deficiency in this protein, resulting in impaired blood clotting and increased bleeding tendency.
**Why Each Wrong Option is Incorrect**
**Option A:** This condition is actually an X-linked recessive disorder, meaning it is caused by a mutation on the X chromosome. It primarily affects males, who have only one X chromosome, while females are usually carriers.
**Option B:** This condition is an autosomal dominant disorder, meaning a single copy of the mutated gene is sufficient to cause the disease. It affects the production of a different protein in the blood clotting cascade, leading to impaired coagulation.
**Option C:** This condition is also an autosomal recessive disorder, similar to the correct answer. It affects the production of another protein in the blood clotting cascade, leading to impaired coagulation and increased bleeding tendency.
**Clinical Pearl / High-Yield Fact**
When evaluating patients with bleeding disorders, it's essential to consider the family history and inheritance pattern of the condition. Autosomal recessive disorders often have a more variable clinical presentation and may be more challenging to diagnose than autosomal dominant disorders.
**Correct Answer: A. This condition is actually an X-linked recessive disorder.**