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The coinheritance of beta- and alpha- thalassemia: a review of one patient and her family.

The diagnosis and management of alpha-thalassemia may be complicated by the variability of the phenotype, which is due to the interaction of coinherited alpha-thalassemia and the variable severity of beta-thalassemia mutations. A well-documented case of complex beta- and alpha-thalassemia coinheritance is described. Laboratory and clinical data for the patient and her family are reviewed. The patient is an asymptomatic girl, one of identical twins. She presented at 1 month of age for follow-up of an abnormal newborn-screening result (hemoglobin F only), which initially suggested homozygosity for beta-thalassemia. Extensive studies on the patient and family revealed that she had coinherited alpha-thalassemia traits and homozygous beta-thalassemia. This case demonstrates the interaction of coinherited alpha- and beta-thalassemia with the resultant amelioration of the clinical phenotype. It also highlights the importance of family studies and close follow-up in diagnosing complex hemoglobinopathies.