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Alpha-thalassemia (α-thalassemia, α-thalassaemia) is an inherited blood disorder and a form of thalassemia. Thalassemias are a group of inherited blood conditions which result in the impaired production of hemoglobin , the molecule that carries oxygen in the blood. [ 4 ]
Carriers of thalassemia genes may have no symptoms (thalassemia minor), very mild symptoms with occasional crisis (thalassemia intermedia) or severe and life threatening symptoms (thalassemia major). [21] Alpha thalassemia major is generally fatal to the unborn child, as the absence of alpha globin means that zero functional hemoglobin is ...
Thalassemia subtypes of clinical significance are alpha thalassemia and beta thalassemia. A third subtype, delta thalassemia, affects production of HBA2 and is generally asymptomatic. [26] The severity of alpha thalassemia depends on how many of the four genes that code for alpha globin are faulty.
Beta-thalassemia (β-thalassemia) is an autosomal dominant blood condition that results in the reduction of hemoglobin production. The cause for the disorder is related to a genetic mutation of the HBB gene. This gene is responsible for providing the instructions to produce beta-globin; one of the major components of hemoglobin.
Hemoglobin A2 (HbA 2) is a normal variant of hemoglobin A that consists of two alpha and two delta chains (α 2 δ 2) and is found at low levels in normal human blood.Hemoglobin A2 may be increased in beta thalassemia or in people who are heterozygous for the beta thalassemia gene.
Mild thalassemia : patients with thalassemia traits do not require medical or follow-up care after the initial diagnosis is made. [2] Patients with β-thalassemia trait should be warned that their condition can be misdiagnosed for the common Iron deficiency anemia.
Hemoglobin Barts is an abnormal form of hemoglobin produced in hemoglobin Barts syndrome or alpha-thalassemia major, the most severe form of alpha-thalassemia. Alpha-thalassemia is a genetic blood disorder and one of the most common hemoglobin-related diseases, affecting the production of α subunits from hemoglobin. [15]
Hemoglobin Barts hydrops fetalis is the most severe form of alpha-thalassemia, and individuals with this disease have severe anemia during the fetal stage of development. [15] It has been considered as fatal until advances in treatment were made.
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