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Alpha-thalassemia (α-thalassemia, α-thalassaemia) is a form of thalassemia involving the genes HBA1 [5] and HBA2. [6] Thalassemias are a group of inherited blood conditions which result in the impaired production of hemoglobin , the molecule that carries oxygen in the blood. [ 7 ]
If these are different versions of the same gene, one having been inherited from each parent it is an example of compound heterozygosity. Both alpha- and beta- thalassemia can coexist with other hemoglobinopathies. Combinations involving alpha thalassemia are generally benign. [50] [51]
If hemoglobin Barts is detected on a newborn screen, the patient is usually referred for further evaluation since detection of hemoglobin Barts can indicate either one alpha globin gene deletion, making the baby a silent alpha thalassemia carrier, two alpha globin gene deletions (alpha thalassemia), or hemoglobin H disease (three alpha globin ...
If these are different versions of the same gene, one having been inherited from each parent it is an example of compound heterozygosity. Both alpha- and beta- thalassemia can coexist with other hemoglobinopathies. Combinations involving alpha thalassemia are generally benign. [30] [31]
Beta-thalassemia has beta globin chains that are reduced and alpha-thalassemia has alpha globin chains that are also reduced. [5] This disorder is the most common autosomal recessive disorder in some countries. [6] Hemoglobin A2 is employed to diagnose thalassemia disorders, encompassing both beta and alpha types.
Carrier testing can help guide the decisions of couples who are at high risk, e.g.: Both of Jewish descent – Several disorders including Tay–Sachs disease. The organization Dor Yeshorim offers testing in many countries. [citation needed] Both Cypriot – Thalassemia. Testing is fully subsidized and mandated in both jurisdictions on Cyprus.
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Alpha-thalassemia (α-thalassemia) is defined by a lack of α-globin chain production in hemoglobin, and those who carry a mutation impacting the α-globin chain on only one chromosome are considered to have a “silent” α-thalassemia whereas, if the mutation is on both then it is considered an α-thalassemia trait.
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