Hereditary spherocytosis, all are true, except
**Core Concept**
Hereditary spherocytosis (HS) is a genetic disorder characterized by the production of abnormal, sphere-shaped red blood cells (RBCs) due to mutations in genes encoding proteins of the RBC membrane, such as spectrin, ankyrin, band 3, and protein 4.2. These mutations lead to defects in RBC membrane structure and stability, resulting in premature destruction of RBCs.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of HS, which involves the premature destruction of RBCs in the spleen. This is due to the abnormal shape of the RBCs, which makes them more susceptible to splenic sequestration and removal from the circulation. The defective RBC membrane proteins, such as spectrin, ankyrin, and band 3, are unable to maintain the normal biconcave disk shape of the RBC, leading to a spheroidal shape that is more easily removed by the spleen.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect, as hereditary spherocytosis is indeed characterized by the production of abnormal RBCs with a spheroidal shape. This is a hallmark of the disease and is responsible for the premature destruction of RBCs.
**Option B:** Incorrect, as hereditary spherocytosis is typically inherited in an autosomal dominant or autosomal recessive pattern, depending on the specific genetic mutation involved. It is not typically inherited in an X-linked pattern.
**Option C:** Incorrect, as hereditary spherocytosis is associated with a variety of symptoms, including hemolytic anemia, jaundice, and splenomegaly, but not typically with bleeding disorders.
**Option D:** Incorrect, as hereditary spherocytosis is not typically associated with the production of abnormal platelets or white blood cells.
**Clinical Pearl / High-Yield Fact**
Hereditary spherocytosis is a classic example of a genetic disorder that affects the structure and function of RBCs, leading to premature destruction and anemia. It is essential to recognize the characteristic spheroidal shape of RBCs in patients with HS, as this can help diagnose the condition.
**Correct Answer:** C.