Pimentel FS, Silva MR, Ferraz MHC, Carvalho NO, Perone C, del Castillo DM, Januario JN, Viana MB. Homozygous Hb Stanleyville-II [alpha2 78(EF7) Asn>Lys; HBA2:c.237C>A, not C>G] associated with genotype -α 3.7/-α 3.7 in two Brazilian families.
Int J Lab Hematol 2011;
33:566-9. [PMID:
21470372 DOI:
10.1111/j.1751-553x.2011.01321.x]
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Abstract
INTRODUCTION
Several hemoglobin variants have electrophoretic behavior similar to hemoglobin S, which may lead to false diagnosis for sickle-cell disorders in newborn screening programs. A homozygous hemoglobin with S mobility was detected in two unrelated babies in Brazil.
METHODS
Isoelectric focusing and high-performance liquid chromatography assays, gene sequencing, and restriction fragment length polymorphism with AfeI were used to characterize the hemoglobin.
RESULTS
Hb Stanleyville-II and -α(3.7) /-α(3.7) type I deletion in the α-globin gene was diagnosed. Parents were heterozygous for both Hb Stanleyville-II and α-thalassemia. Hypochromia and microcytosis were probably due to the homozygous α-thalassemia.
CONCLUSION
Stanleyville-II gene mutation is HBA2:c.237C>A, or C>G, and this information on the Globin Gene Server should be updated; AfeI test is a fast and accurate method to detect it; NBS programs should consider the possibility of Hb Stanleyville-II whenever IEF shows one band in the HbS position, and another one between S and C.
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