The major component of the red blood cells is hemoglobin A which consists of 2α- and 2β-globin chains encoded by α- and β-globin genes located in two different gene clusters (16p13.3 and 11p.15.5, respectively). Molecular defects (usually point mutation or short deletion) that give rise to a quantitative reduction of the corresponding globin chain, result in a hereditary hypochromic and microcytic anemia called...
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