Congenital dyserythropoietic anemia type IV

Definition

A form of congenital dyserythropoietic anemia (CDA) characterized by ineffective erythropoiesis and hemolysis that leads to severe anemia at birth, requiring repeated transfusions. The majority of affected individuals experience severe hemolytic anemia, often accompanied by a normal or slightly elevated reticulocyte count, hepatosplenomegaly, hyperbilirubinemia, and persistence of fetal hemoglobin. Hypertrophic cardiomyopathy and occasional dysmorphic features, including large anterior fontanel, hypertelorism, micropenis, and hypospadias, have also been reported. All documented cases to date share the same dominant-negative missense variant, E325K, in the KLF1 gene (19p13.2).