Human Genetics

, Volume 124, Issue 5, pp 515–524

Haplotypes of IL-10 promoter variants are associated with susceptibility to severe malarial anemia and functional changes in IL-10 production

Authors

  • Collins Ouma
    • Centre for Global Health ResearchKenya Medical Research Institute, University of New Mexico/KEMRI Laboratories of Parasitic and Viral Diseases
  • Gregory C. Davenport
    • Department of Infectious Diseases and Microbiology, Graduate School of Public HealthUniversity of Pittsburgh
  • Tom Were
    • Centre for Global Health ResearchKenya Medical Research Institute, University of New Mexico/KEMRI Laboratories of Parasitic and Viral Diseases
    • Department of PathologyKenyatta University
  • Michael F. Otieno
    • Department of Pre-Clinical SciencesKenyatta University
  • James B. Hittner
    • Department of PsychologyCollege of Charleston
  • John M. Vulule
    • Centre for Global Health ResearchKenya Medical Research Institute, University of New Mexico/KEMRI Laboratories of Parasitic and Viral Diseases
  • Jeremy Martinson
    • Department of Infectious Diseases and Microbiology, Graduate School of Public HealthUniversity of Pittsburgh
  • John M. Ong’echa
    • Centre for Global Health ResearchKenya Medical Research Institute, University of New Mexico/KEMRI Laboratories of Parasitic and Viral Diseases
    • Division of Infectious DiseasesUniversity of New Mexico School of Medicine
  • Robert E. Ferrell
    • Department of Human Genetics, Graduate School of Public HealthUniversity of Pittsburgh
    • Centre for Global Health ResearchKenya Medical Research Institute, University of New Mexico/KEMRI Laboratories of Parasitic and Viral Diseases
    • Division of Infectious DiseasesUniversity of New Mexico School of Medicine
Original Investigation

DOI: 10.1007/s00439-008-0578-5

Cite this article as:
Ouma, C., Davenport, G.C., Were, T. et al. Hum Genet (2008) 124: 515. doi:10.1007/s00439-008-0578-5

Abstract

Plasmodium falciparum malaria is one of the leading global causes of morbidity and mortality with African children bearing the highest disease burden. Among the various severe disease sequelae common to falciparum malaria, severe malarial anemia (SMA) in pediatric populations accounts for the greatest degree of mortality. Although the patho-physiological basis of SMA remains unclear, dysregulation in inflammatory mediators, such as interleukin (IL)-10, appear to play an important role in determining disease outcomes. Since polymorphic variability in innate immune response genes conditions susceptibility to malaria, the relationship between common IL-10 promoter variants (−1,082A/G, −819T/C, and −592A/C), SMA (Hb < 6.0 g/dL), and circulating inflammatory mediator levels (i.e., IL-10, TNF-α, IL-6 and IL-12) were investigated in parasitemic Kenyan children (n = 375) in a holoendemic P. falciparum transmission area. Multivariate logistic regression analyses demonstrated that the −1,082G/−819C/−592C (GCC) haplotype was associated with protection against SMA (OR; 0.68, 95% CI, 0.43–1.05; = 0.044) and increased IL-10 production (= 0.029). Although none of the other haplotypes were significantly associated with susceptibility to SMA, individuals with the −1,082A/−819T/−592A (ATA) haplotype had an increased risk of SMA and reduced circulating IL-10 levels (= 0.042). Additional results revealed that the IL-10:TNF-α ratio was higher in the GCC group (= 0.024) and lower in individuals with the ATA haplotype (= 0.034), while the IL-10:IL-12 ratio was higher in ATA haplotype (= 0.006). Results presented here demonstrate that common IL-10 promoter haplotypes condition susceptibility to SMA and functional changes in circulating IL-10, TNF-α, and IL-12 levels in children with falciparum malaria.

Copyright information

© Springer-Verlag 2008