Mostly caused by deletions of one or both copies of the α-globin gene in the α-cluster. Thus, γ- and β-globin are in excess. Affects the formation of both fetal and adult hemoglobins.

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1. Mostly caused by deletions of one or both copies of the α-globin gene in the α-cluster. Thus, γ- and β-globin are in excess. Affects the formation of both fetal and adult hemoglobins.