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Hereditary Elliptocytosis as a Modifier of Sickle Cell Disease Severity
Background The life cycle of Plasmodium parasites, the parasites responsible for the transmission of malaria, depends on the parasites’ ability to invade red blood cells. Mutations that alter the structure of red blood cells, including the mutation that causes sickle cell disease (Hb-SS), interfere with the life cycle of Plasmodium parasites and provide protection against malaria. Patients with Hb-SS rarely develop severe anemia that requires blood transfusions before 6 months of age. Case Presentation A female infant with Hb-SS discovered on routine newborn screening began needing monthly transfusions to maintain hemoglobin levels above 7 g/dl at the age of 6 weeks of life. Due to the severity of her anemia, hemolytic anemia gene sequencing was performed and revealed the presence of hereditary elliptocytosis and heterozygosity for G6PD deficiency. Splenectomy, performed at 2 years of age due to splenic sequestration, resulted in decreased frequency of transfusions, highlighting the role of hereditary elliptocytosis in her presentation. Discussion Hereditary elliptocytosis modifies the severity of Hb-SS; coexistence of hereditary elliptocytosis with Hb-SS can result in severe, early-onset anemia. Infants with Hb-SS and severe anemia need genetic testing to investigate for other causes of anemia.