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Sickle cell syndromes. II. The sickle cell anemia-alpha-thalassemia syndrome
Insights
This study describes five Black children with sickle cell anemia-alpha-thalassemia syndrome. The co-inheritance of alpha-thalassemia did not appear to significantly alter the clinical presentation of sickle cell disease.
Area of Science:
- Hematology
- Genetics
- Pediatrics
Background:
- Sickle cell anemia (SCA) is a genetic blood disorder.
- Alpha-thalassemia is another inherited blood disorder.
- Co-inheritance of SCA and alpha-thalassemia is observed in some populations.
Observation:
- Five African American pediatric patients with sickle cell anemia-alpha-thalassemia syndrome were studied.
- Patients presented with persistent microcytosis unexplained by iron deficiency.
- Family studies confirmed alpha-thalassemia and sickle cell trait in parents.
Findings:
- One patient showed elevated Barts (gamma4) hemoglobin levels.
- Alkali-resistant hemoglobin and reticulocyte counts were comparable to SCA patients.
- Irreversibly sickled cells were rarely observed in peripheral blood smears.
Implications:
- Alpha-thalassemia co-inheritance did not demonstrate a major ameliorative effect on clinical sickle cell disease expression in these patients.
- Further research is needed to understand the complex interactions between SCA and alpha-thalassemia.
- This finding has implications for genetic counseling and understanding disease variability.
Abstract:
Five American black patients, ages 1 to 16 years, with the sickle cell anemia-alpha-thalassemia syndrome are described. Each patient had persistent microcytosis not explained by iron deficiency, and in each family the presence of alpha-thalassemia in combination with sickle cell trait was demonstrated in one of the parents. In one patient, in whom the diagnosis of sickle cell anemia was established at birth, an elevated level of Barts (gamma4) hemoglobin was also found. In these patients levels of alkali-resistant hemoglobin and reticulocyte counts were similar to those of sickle cell anemia patients of comparable age; however, stained smears of their peripheral blood rarely showed the presence of irreversibly sickled cells. No major ameliorative effect of the alpha-thalassemia on the clinical expression of the sickle cell disease of these patients was evident.