FcgammaRIIA polymorphisms in Streptococcus pneumoniae infection

Immunology and Cell Biology
Fang Fang YuanJohn S Sullivan

Abstract

Invasive pneumococcal disease continues to be a major cause of morbidity and mortality among children and adults worldwide. Effective host defence against Streptococcus pneumoniae depends on immunoglobulin G-mediated phagocytosis of the bacteria and it has been shown in vitro that the FcgammaRIIA polymorphism (FcgammaRIIA-R131 vs FcgammaRIIA-H131) determines the capacity of immunoglobulin G2-mediated phagocytosis via this receptor. In this study, we evaluated FcgammaRIIA polymorphisms in children with pneumococcal sepsis and a number of control groups in order to investigate a possible association of FcgammaRIIA genotypes with Streptococcus pneumoniae infection. The distribution of the genotypes differed in these populations. The frequency of homozygosity for FcgammaRIIA-R/R131 in the patients was significantly higher than that in the healthy random donor population (43%vs 21%, P < 0.05). The frequencies of FcgammaRIIA-H/H131 were similar among all groups of individuals, while the incidence of the heterozygous FcgammaRIIA-R/H131 was lower (35%vs 52%, P < 0.05). Thus, it appears that the FcgammaRIIA-H131 polymorphic form, even in the heterozygous form, may be protective for pneumococcal sepsis and children with FcgammaRIIA-R/R13...Continue Reading

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Citations

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