Role of epistatic (modifier) genes in the modulation of the phenotypic diversity of sickle cell anemia.

Abstract excerpt

Sickle hemoglobin is the product of one mutated gene, but the disease phenotype is the product of many genes. Polymorphism among the genes responsible for the pleotropic effects can be epistatic (or modifier) genes contributing to interindividual variation that characterizes sickle cell anemia patients. Modulation in the hemoglobin F levels is associated with the beta-globin gene cluster haplotypes and to gender...

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