Abstract
Severe malarial anemia (SMA) is a leading cause of pediatric morbidity and mortality in holoendemic Plasmodium falciparum transmission areas. Although dysregulation in cytokine production is an important etiology of SMA, the role of IFN-α in SMA has not been reported. As such, we investigated the relationship between IFN-α promoter polymorphisms [i.e., IFNA2 (A-173T) and IFNA8 (T-884A)], SMA, and functional changes in IFN-α production in children (n = 663; <36 months) residing in a holoendemic P. falciparum transmission region of Kenya. Children with SMA had lower circulating IFN-α than malaria-infected children without severe anemia (P = 0.025). Multivariate logistic regression analyses revealed that heterozygosity at −884 (TA) was associated with an increased risk of SMA [OR 2.80 (95 % CI 1.22–6.43); P = 0.015] and reduced IFN-α relative to wild type (TT; P = 0.038). Additional analyses demonstrated that carriage of the −173T/−884A (TA) haplotype was associated with increased susceptibility to SMA [OR 3.98 (95 % CI 1.17–13.52); P = 0.026] and lower IFN-α (P = 0.031). Follow-up of these children for 36 months revealed that carriers of TA haplotype had greater all-cause mortality than non-carriers (P < 0.001). Generation of reporter constructs showed that the IFNA8 wild-type −884TT exhibited higher levels of luciferase expression than the variant alleles (P < 0.001). Analyses of malaria-associated inflammatory mediators demonstrated that carriers of TA haplotype had altered production of IL-1β, MIG, and IL-13 compared to non-carriers (P < 0.050). Thus, variation at IFNA2 −173 and IFNA8 −884 conditions reduced IFN-α production, and increased susceptibility to SMA and mortality.
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Acknowledgments
This work was supported by the National Institutes of Health Research Grants R01AI51305 and D43TW05884 (DJP). The authors gratefully acknowledge the assistance of the Siaya District Hospital team and the University of New Mexico/KEMRI staff for all the clinical support. We are very grateful to all the parents, guardians, and children who participated in the study. The authors sincerely thank the Director of Kenya Medical Research Institute for approving the data to be published in the study.
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The authors have declared that no competing interests exist.
Ethical standard
The study was approved by the ethical and scientific review committees at the University of Pittsburgh and University of New Mexico and the Kenya Medical Research Institute.
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Kempaiah, P., Anyona, S.B., Raballah, E. et al. Reduced interferon (IFN)-α conditioned by IFNA2 (−173) and IFNA8 (−884) haplotypes is associated with enhanced susceptibility to severe malarial anemia and longitudinal all-cause mortality. Hum Genet 131, 1375–1391 (2012). https://doi.org/10.1007/s00439-012-1175-1
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DOI: https://doi.org/10.1007/s00439-012-1175-1