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Klein, W. et al.

Klein, Tromm, Griga, Fricke, Folwaczny, Hocke, Eitner, Marx, Duerig, Epplen,

A polymorphism in the IL11 gene is associated with ulcerative colitis.

Inflammatory bowel diseases (IBD) are multifactorial disorders characterised by the host's inability to limit the inflammatory response to luminal antigens. The association of polymorphisms in the CARD15 gene with Crohn's disease (CD) demonstrates the relevance of activated transcription factor NF(kappa)B in mononuclear cells. Interleukin 11 (IL11) mediates anti-inflammatory effects and is able to downregulate LPS-induced NF(kappa)B activation. The IL11 gene is therefore a good candidate involved in genetic predisposition to IBD. To evaluate the role of the IL11 gene in IBD, two polymorphisms, including a dinucleotide repeat in the promoter region, have been genotyped in 222 patients with CD, 152 patients with ulcerative colitis (UC) and 400 healthy controls. PCR-SSCP analysis of the coding region revealed a single polymorphism in exon 4 leading to an amino acid exchange (G335A; R112H), not significantly associated with either disease. Dinucleotide repeat frequencies of the IL11.A1 allele and of IL11.A1 homozygous individuals were significantly increased among the patients with UC (P < 0.002 and (P < 0.003, respectively) but not with CD. Altered expression of IL11 appears to be involved in the genetic predisposition of UC.[1]

References

A polymorphism in the IL11 gene is associated with ulcerative colitis. Klein, W., Tromm, A., Griga, T., Fricke, H., Folwaczny, C., Hocke, M., Eitner, K., Marx, M., Duerig, N., Epplen, J.T. Genes Immun. (2002) [Pubmed]

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