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Clinical and molecular characteristics of sickle cell anemia in the northeast of Brazil

By Elisângela Vitória Adorno, Ângela Zanette, Isa Lyra, Magda Oliveira Seixas, Mitermayer Galvão Reis and Marilda Souza Gonçalves

Abstract

Beta S-globin gene (&#946;S-globin) haplotypes, markers for severe sickle cell anemia (SCA), and the alpha-thalassemia 2 gene 3.7 kb deletion (-&#945;2(3.7 kb) thal) along with demographic and clinical data were investigated in SCA outpatients (n = 125, 63 female and 62 male) in the Brazilian state of Bahia, which has a high prevalence SCA. PCR-RFLP showed that the Central African Republic/Benin (CAR/BEN, 51.2%) haplotype was most frequent, followed by the Benin/Benin (Ben/Ben, 28.8%). At least one CAR haplotype was present in every outpatient with a history of cerebrovascular accident. The Cameroon (Cam), Senegal (Sen) and Arab-India haplotypes occurred in small numbers, as did atypical haplotypes. Fetal hemoglobin (HbF, %) was unevenly distributed. Compared to those > 18 y, those aged < 18 y had had fewer erythrocyte transfusions and high HbF levels (12.3% ± 7.01 to 7.9% ± 4.36) but a higher frequency of spleen sequestration and pneumonia. Compared with normal &#945; - genes carriers values, the outpatients with -&#945;2(3.7 kb) thal (determined by PCR analysis) had significantly higher mean hemoglobin concentration (Hb) (8.3 ± 1.34 g/dL, p = 0.018) and packed cell volume (PCV = 27.1% ± 4.26, p = 0.019) but low mean corpuscular volume (MCV = 86.1 fL = 10-15 L ± 9.56, p = 0.0004) and mean corpuscular hemoglobin (MCH = 26.6% ± 4.60, p = 0.039)

Topics: alpha-thalassemia 2 gene 3.7 kb deletion (-&#945;23.7 kb thal), &#946;S-globin gene haplotypes, Fetal hemoglobin
Publisher: Sociedade Brasileira de Genética
Year: 2008
OAI identifier: oai:periodicos.ibict.br.GeneticsandMolecularBiology:oai:scielo:S1415-47572008000400003
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