In beta thalassemia, there is –
## **Core Concept**
Beta thalassemia is a genetic disorder affecting hemoglobin synthesis. It results from mutations in the HBB gene that codes for the beta-globin subunit of hemoglobin, leading to reduced or absent production of the beta-globin chains. This imbalance disrupts normal hemoglobin production.
## **Why the Correct Answer is Right**
The correct answer, , indicates a reduction in the production of beta-globin chains. In beta thalassemia, the defect lies in the production of the beta-globin subunit of hemoglobin. This reduction leads to a relative excess of alpha-globin chains, which can precipitate and cause damage to red blood cells. The severity of beta thalassemia depends on the nature of the mutation: some mutations lead to a mild reduction in beta-globin production (beta thalassemia minor), while others result in a nearly complete absence (beta thalassemia major).
## **Why Each Wrong Option is Incorrect**
- **Option A:** - This option suggests an increase in beta-globin chains, which is the opposite of what occurs in beta thalassemia.
- **Option B:** - This option implies a normal production of beta-globin chains, which does not align with the pathophysiology of beta thalassemia.
- **Option D:** - This option suggests a defect in the alpha-globin chains, which is characteristic of alpha thalassemia, not beta thalassemia.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that beta thalassemia major, also known as Cooley's anemia, requires regular blood transfusions and iron chelation therapy to manage the disease. The diagnosis of beta thalassemia involves genetic testing and hemoglobin electrophoresis.
## **Correct Answer:** . Reduced production of beta globin chain.