etiology of thalassemia

Thalassemia is a genetic blood disorder caused by a mutation in the DNA of cells that make hemoglobin — the substance in your red blood cells that carries oxygen throughout your body. The mutation results in excessive destruction of red blood cells, which leads to anemia.

Here are the steps that lead to Thalassemia:

1. Inheritance of Mutated Genes: Thalassemia is inherited, meaning that at least one of your parents must be a carrier of the disease. It's caused by either a genetic mutation or a deletion of certain key gene fragments.

2. Types of Thalassemia: The type of thalassemia you have depends on the number of gene mutations you inherit from your parents and which part of the hemoglobin molecule is affected by the mutations. The more mutated genes, the more severe your thalassemia. Hemoglobin molecules are made of alpha and beta parts that can be affected.

3. Alpha-Thalassemia: Two genes from each parent (four genes total) are needed to make alpha globin protein chains. Alpha thalassemia trait occurs if one or two of these genes are missing. If more than two are missing, moderate to severe symptoms including anemia can occur.

4. Beta-Thalassemia: One gene from each parent (two genes total) are needed to make beta globin protein chains. Beta thalassemia occurs if one or both genes are altered. The severity of beta thalassemia depends on how much one or both genes are affected.

5. Excessive Destruction of Red Blood Cells: The genetic mutations associated with thalassemia disrupt the normal production of hemoglobin and cause low levels of the protein. This leads to a lack of oxygen in many parts of the body and can cause a variety of health problems, including fatigue, weakness, pale or yellowish skin, facial bone deformities, slow growth, abdominal swelling, and dark urine.

6. Complications: Over time, thalassemia can lead to complications including iron overload, bone deformities, enlarged spleen, and heart problems.