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. 1996 Nov;39(5):705–710. doi: 10.1136/gut.39.5.705

Cytokine gene polymorphisms in inflammatory bowel disease.

E Louis 1, J Satsangi 1, M Roussomoustakaki 1, M Parkes 1, G Fanning 1, K Welsh 1, D Jewell 1
PMCID: PMC1383395  PMID: 9014770

Abstract

BACKGROUND: Concordance rates in siblings and twins provide strong evidence that genetic susceptibility is important in the pathogenesis of inflammatory bowel disease. The number and identity of susceptibility genes is largely uncertain. Cytokine genes are attractive candidate loci. AIMS: To study allelic frequencies of polymorphisms of the interleukin-1 receptor antagonist (IL-1RA) gene and the tumour necrosis factor alpha gene in patients with inflammatory bowel disease. SUBJECTS: One hundred and twenty nine North European caucasoid patients with ulcerative colitis, 120 patients with Crohn's disease, and 89 healthy controls. METHODS: Genotyping was performed by polymerase chain reaction. A variable number of tandem repeats (VNTR) in the IL-1RA gene and a single base pair polymorphism in the TNF alpha gene promoter region (TNF-308) were analysed. RESULTS: No significant differences in IL-1RA VNTR allelic frequencies were noted between Crohn's disease (allele 1: 72.6%, allele 2: 24.7%, allele 3: 2.6%), ulcerative colitis (72.6%, 24.3%, 3.1%, respectively), and controls (76.9%, 20.8% and 2.3%). Some 42.4% of patients with ulcerative colitis and 43.4% patients with Crohn's disease were carriers of allele 2, compared with 34.8% healthy subjects. The TNF2 allele was modestly reduced in Crohn's disease (13.2%), compared with healthy subjects (21.3%; p = 0.04), and ulcerative colitis (21.6%). CONCLUSIONS: The associations demonstrated are modest: these polymorphisms are unlikely to be important determinants of overall disease susceptibility.

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Selected References

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