Lack of association between polymorphisms of the IL18R1 and IL18RAP genes and cardiovascular risk: the MORGAM Project
1 INSERM, UMR_S 937, F-75013, Paris, France
2 UPMC Univ Paris 06, UMR_S 937, F-75013, Paris, France
3 Department of Molecular Medicine, National Public Health Institute, Helsinki, Finland
4 Department of Health Promotion and Chronic Disease Prevention, National Public Health Institute, Helsinki, Finland
5 Department of Internal Medicine, University of Umeå, Umeå, Sweden
6 Centre Department of Epidemiology and Public Health, Queen's University of Belfast, Belfast, UK
BMC Medical Genetics 2009, 10:44 doi:10.1186/1471-2350-10-44Published: 27 May 2009
Interleukin-18 is a pro-inflammatory cytokine suspected to be associated with atherosclerosis and its complications. We had previously shown that one single nucleotide polymorphism (SNP) of the IL18 gene was associated with cardiovascular disease (CVD) through an interaction with smoking. As a further step for elucidating the contribution of the IL-18 pathway to the etiology of CVD, we here investigated the association between the genetic variability of two IL-18 receptor genes, IL18R1 and IL18RAP, with the risk of developing CVD.
Eleven tagging SNPs, 5 in IL18R1 and 6 in IL18RAP, characterizing the haplotypic variability of the corresponding genes; were genotyped in 5 European prospective CVD cohorts including 1416 cases and 1772 non-cases, as part of the MORGAM project. Both single-locus and haplotypes analyses were carried out to investigate the association of these SNPs with CVD.
We did not find any significant differences in allele, genotype and haplotype frequencies between cases and non-cases for either of the two genes. Moreover, the search for interactions between SNPs located in different genes, including 5 IL18 SNPs previously studied in the MORGAM project, and between SNPs and environmental factors remained unfruitful.
Our analysis suggests that the variability of IL18R1 and IL18RAP genes are unlikely to contribute to modulate the risk of CVD.