Variation in the IL1B, TNF and IL6 genes and individual susceptibility to prosthetic joint infection
1 Laboratory of Immunogenomics and Immunoproteomics, Faculty of Medicine and Dentistry, Palacky University Olomouc, I. P. Pavlova 6, Olomouc, 77520, Czech Republic
2 Department of Orthopaedics, Faculty of Medicine and Dentistry, Palacky University Olomouc and University Hospital, I. P. Pavlova 6, Olomouc, 77520, Czech Republic
BMC Immunology 2012, 13:25 doi:10.1186/1471-2172-13-25Published: 8 May 2012
Prosthetic joint infection (PJI) is an important failure mechanism of total joint arthroplasty (TJA). Here we examine whether the particular genetic variants can lead to increased susceptibility to PJI development.
We conducted a genetic-association study to determine whether PJI could be associated with functional cytokine gene polymorphisms (CGP) influencing on innate immunity response. A case–control design was utilized and previously published criteria for PJI were included to distinguish between cases and control subjects with/without TJA. Six single nucleotide polymorphisms (SNPs) located in the genes for interleukin-1beta (SNP: IL1B-511, +3962), tumour necrosis factor alpha (TNF-308, -238) and interleukin-6 (IL6-174, nt565) were genotyped in 303 Caucasian (Czech) patients with TJA (89 with PJI / 214 without PJI), and 168 unrelated healthy Czech individuals without TJA. The results showed that carriers of the less common IL1B−511*T allele were overrepresented in the group of TJA patients with PJI (69%) in comparison with those that did not develop PJI (51%, p = 0.006, pcorr = 0.037) and with healthy controls (55%, p = 0.04, pcorr = N.S.). There was no significant difference in the distribution of the remaining five investigated CGPs and their haplotypes between groups.
A functional variant of the gene encoding for IL-1beta was preliminarily nominated as a genetic factor contributing to the susceptibility to PJI. Our results should be independently replicated; studies on the functional relevance of IL1B gene variants in PJI are also needed.