Trouble making blood. Alpha thalassemia is caused by a mutation in one or more of the 4 genes that code for (holds the dna for) Alpha globulin, which is needed to make hemoglobin for new red blood cells. Beta thalassemia is caused by a mutation in one or both of the 2 beta globulin genes. Persons with thalassemia have less or little ability to make Alpha and/or beta globulin, so they can't make enough red blood cells.
See below. In thalassemia, the disease is caused by the weakening and destruction of red blood cells. Thalassemia is caused by variant or missing genes that affect how the body makes hemoglobin. Hemoglobin is the protein in red blood cells that carries oxygen. People with thalassemia make less hemoglobin and fewer circulating red blood cells than normal, which results in mild or severe anemia. Thalassemia w.