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Sökning: WFRF:(Hermsen Cornelus C)

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  • McCall, Matthew B B, et al. (författare)
  • Persistence of full-length caspase-12 and its relation to malaria in West and Central African populations
  • 2010
  • Ingår i: European Cytokine Network. - 1148-5493 .- 1952-4005. ; 21:2, s. 77-83
  • Tidskriftsartikel (refereegranskat)abstract
    • Background. The full-length (L-) variant of caspase-12 is believed to predispose to sepsis. It has been replaced in the genome of most human populations by the (S-) variant, which leads to premature termination of translation. Strikingly, the L-allele is still widely prevalent in African populations, presumably due to a counterbalancing selective force specific to this continent, for which malaria is a prime candidate.Methods. We investigated associations between caspase-12 genotype and malarial parameters in three West-African populations, in studies encompassing immunological, clinical and obstetric data. Results. The caspase-12 L-allele was found at frequencies of 11-34%. Plasmodium falciparum-stimulated mononuclear cells from S/L heterozygote donors produced stronger interferon-γ and interleukin-10 responses than S/S homozygotes (p = 0.011 and p = 0.023 in uninfected and infected donors respectively). Nevertheless, we found no association between caspase-12 genotype and either the presentation of severe malaria or individual clinical parameters in sick children. Amongst pregnant women, the caspase-12 genotype did not influence peripheral or placental malaria infection, or basic obstetric parameters. Interestingly, perinatal mortality was more frequent in children of both S/S and L/L than S/L mothers, independent of placental P. falciparum-infection.Conclusion. We find little clinical or epidemiological evidence that malaria has contributed to the persistence of functional caspase-12 in Africa, suggesting either that alternative selective forces are at work or that genetic drift underlies its current global distribution.
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