Cytokine Gene Polymorphisms and Genetic Association with Coeliac Disease in the Finnish Population

Coeliac disease (CD) is an intestinal disorder caused by intolerance to dietary gluten in susceptible individuals. The HLA‐DQ genes are major risk factors for CD, but other genes also play an important role in the disease susceptibility. Immune‐mediated mechanisms are known to underlie the pathogenesis of CD. We studied single‐nucleotide polymorphisms in transforming growth factor (TGF)‐β1, interleukin (IL)‐10, IL‐6, interferon (IFN)‐γ and tumour necrosis factor (TNF)‐α genes in the Finnish population using family‐based association approach. In addition, we genotyped a trinucleotide repeat polymorphism in the major histocompatibility complex (MHC) class I chain‐related protein A (MICA) gene, located in the human leucocyte antigen (HLA) region in the vicinity of TNF‐α. To control the effect of linkage disequilibrium between HLA‐DQ genes and MICA and TNF‐α, an HLA‐stratified association analysis was performed. We did not find evidence of association between TGF‐β1, IL‐10, IL‐6 and IFN‐γ polymorphisms and CD susceptibility. No association was found for any of the MICA alleles independently of DQ genes, whereas TNF‐α−308 A allele was slightly overrepresented on chromosomes carried by CD patients compared with control chromosomes, indicating that either TNF‐α, or another gene in linkage disequilibrium with it, could confer increased susceptibility to CD. This result supports the earlier findings that the HLA region harbours a novel susceptibility factor in addition to HLA‐DQ.

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