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Most cases of {alpha}-thalassemia result from large deletions at the {alpha}-globin locus (1). The {alpha}-globin gene cluster contains a tandem array of 2 nearly identical {alpha}-globin genes (HBA; Fig. 1A ) (2). The {alpha}0-thalassemias are characterized by deletions that inactivate both {alpha}-globin genes of a given chromosome, whereas in {alpha}+-thalassemias, one gene remains functional. The most widespread {alpha}+-thalassemias are those designated –{alpha}3.7 and –{alpha}4.2, according to the lengths of the deleted fragments (3).<br /

Diagnosis of α+-Thalassemias by Determining the Ratio of the Two α-Globin Gene Copies by Oligonucleotide Hybridization and Melting Curve Analysis