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Influence of the βs haplotype and α-thalassemia on stroke development in a Brazilian population with sickle cell anaemia

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Abstract

Stroke is a catastrophic complication of sickle cell anaemia (SCA) and is one of the leading causes of death in both adults and children with SCA. Evidence suggests that some genetic polymorphisms could be related to stroke development, but their association remains controversial. Here, we performed genotyping of five published single nucleotide polymorphisms, the α-thalassemia genotype, the G6PD A (−) variant deficiency, and the βS haplotype in a large series of SCA patients with well-defined stroke phenotypes. Of 261 unrelated SCA patients included in the study, 67 (9.5 %) presented a documented, primary stroke event. Markers of haemolysis (red blood cell (RBC) counts, p = 0.023; reticulocyte counts, p = 0.003; haemoglobin (Hb) levels, p < 0.001; indirect bilirubin levels, p = 0.006; lactate dehydrogenase (LDH) levels, p = 0.001) were associated with stroke susceptibility. Genetically, only the βS haplotype (odds ratio (OR) 2.9, 95 % confidence interval (CI) 1.56 to 4.31; p = 0.003) and the α3.7kb-thalassemia genotype (OR 0.31, 95 % CI 0.11 to 0. 83; p = 0.02) were associated with increased and decreased stroke risk, respectively. In multivariate analysis, the βS haplotype was independently associated with stroke development (OR 2.26, 95 % CI 1.16 to 4.4; p = 0.016). Our findings suggest that only the βS haplotypes and the α3.7kb-thalassemia genotype modulate the prevalence of stroke in our SCA population. Genetic heterogeneity among different populations may account for the irreproducibility amongst different studies.

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Acknowledgments

This study was supported by the Fundação de Amparo a Pesquisa do Estado de Pernambuco (FACEPE: grant #0513-2.02/10) and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq: grant #481904/2010-7).

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Genetics, Centre of Biological Sciences, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235, Recife, PE, 50670-901, Brazil

    Igor F. Domingos, Diego A. Falcão, Betania L. Hatzlhofer, Antonio R. Lucena-Araujo & Marcos A. Bezerra

  2. Haematology and Haemotherapy Foundation of Pernambuco, Recife, Brazil

    Igor F. Domingos, Betania L. Hatzlhofer, Renata C. Azevedo, Cíntia G. Machado, Aderson S. Araújo & Marcos A. Bezerra

  3. Department of Genetics and Evolution, Federal University of São Carlos, São Carlos, Brazil

    Anderson F. Cunha

  4. Department of Clinical Pathology, School of Medical Sciences, University of Campinas, Campinas, Brazil

    Magnun N. Santos

  5. Haematology and Haemotherapy Centre, University of Campinas, São Paulo, Brazil

    Dulcinéia M. Albuquerque, Kleber Y. Fertrin & Fernando F. Costa

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  1. Igor F. Domingos
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  2. Diego A. Falcão
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  8. Fernando F. Costa
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Correspondence to Antonio R. Lucena-Araujo.

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Domingos, I.F., Falcão, D.A., Hatzlhofer, B.L. et al. Influence of the βs haplotype and α-thalassemia on stroke development in a Brazilian population with sickle cell anaemia. Ann Hematol 93, 1123–1129 (2014). https://doi.org/10.1007/s00277-014-2016-1

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