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HBA2 / Hemoglobin Alpha 2
hemoglobin, alpha 2
The human alpha globin gene cluster located on chromosome 16 spans about 30 kb and includes the following five loci: 5'- zeta - pseudozeta - pseudoalpha-1 - alpha-2 - alpha-1 -3'. The alpha-2 (HBA2) and alpha-1 (HBA1) coding sequences are identical. These genes differ slightly over the 5' untranslated regions and the introns, but they differ significantly over the 3' untranslated regions. Two alpha chains plus two beta chains constitute HbA, which in normal adult life comprises about 97% of the total hemoglobin; alpha chains combine with delta chains to constitute HbA-2, which with HbF (fetal hemoglobin) makes up the remaining 3% of adult hemoglobin. Alpha thalassemias result from deletions of each of the alpha genes as well as deletions of both HBA2 and HBA1 respectively; some nondeletion alpha thalassemias have also been reported.
| Gene Name: | hemoglobin, alpha 2 |
| Synonyms: | HBA2, Alpha globin, Alpha-2 globin, HBH, Hemoglobin alpha chain, Hemoglobin A1c, Hemoglobin subunit alpha, Hemoglobin, alpha 2, Alpha-globin |
| Target Sequences: | NM_000517 NP_000508.1 P69905 |
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