Interleukin-18 promoter polymorphisms and risk of idiopathic recurrent pregnancy loss in a Tunisian population

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Abstract

IL-18 is a pro-inflammatory cytokine that regulates the differentiation and effector functions of CD4+ (Th1) and CD8+ (CTL) T cells, which are implicated in the pathogenesis of recurrent pregnancy loss (RPL). We investigated the association of the IL-18 gene promoter single nucleotide polymorphisms (SNPs) -656C/A (rs1946519), -137G/C (rs187238), -119A/C (rs360718), and -105G/A (rs360717), by TaqMan assays in analysis in 470 Tunisian women comprising 235 RPL cases and 235 multi-parous controls. The association of IL-18 alleles, genotypes, and haplotypes with RPL was evaluated by Fisher's exact test and regression analysis. The frequency of minor alleles -105G/A (P< 0.001) and -656C/A (P< 0.001), but not -119A/C (P= 0.93) or -137G/C (P= 0.32), were higher in RPL cases. Significant differences were also noted in the genotype distribution of -105G/A (P< 0.001) and -656C/A (P< 0.001) between cases and controls. Four-locus (-656C/A, -137G/C, -119A/C, -105G/A) IL-18 haplotype analysis identified AGAA (corrected P< 0.001), and CGAA (corrected P< 0.001) haplotypes to be associated with increased RPL risk, after adjusting for age and BMI. These results demonstrate that -105G/A and -656C/A IL-18 variants are significantly associated with RPL. © 2012 Elsevier Ireland Ltd.

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Messaoudi, S., Dandana, M., Magdoud, K., Meddeb, S., Ben Slama, N., Hizem, S., & Mahjoub, T. (2012). Interleukin-18 promoter polymorphisms and risk of idiopathic recurrent pregnancy loss in a Tunisian population. Journal of Reproductive Immunology, 93(2), 109–113. https://doi.org/10.1016/j.jri.2011.12.002

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