The Mal/TIRAP S180L and TLR4 G299D polymorphisms are not associated with susceptibility to, or severity of, rheumatoid arthritis

Annals of the Rheumatic Diseases
F J SheedyA G Wilson

Abstract

Toll-like receptors (TLRs), including TLR4, have been implicated in the pathogenesis of rheumatoid arthritis (RA). Signalling by these receptors involves interactions with intracellular proteins, including the MyD88 adapter-like (Mal) protein. Recently, a polymorphism (Mal S180L) has been described which contributes to susceptibility to common infectious diseases and inhibits proinflammatory cytokine production. A non-synonymous variant in the extracellular domain of TLR4 (G299D) has been shown to interrupt TLR4-mediated signalling, resulting in endotoxin hyporesponsiveness. To investigate the role of TLR4 G299D and Mal S180L variants in RA. A total of 964 Caucasians with RA and 965 controls were genotyped. Deviation from Hardy-Weinberg equilibrium was tested for each single nucleotide polymorphism in cases and controls separately using a chi(2) test with a threshold of p<0.05. The odd ratios were calculated with asymptotic 95% confidence intervals, and p values <0.05 were considered significant. Epistasis was assessed using both stratified analysis and the linkage disequilibrium-based statistic. Mal S180L genotypes were similar in cases and controls (OR = 0.9, 95% CI 0.7 to 1.0, p = 0.2). Similarly, no difference for TLR4 G299...Continue Reading

Citations

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