A functional polymorphism in the promoter region of IL-33 is associated with the reduced risk of colorectal cancer

Abstract

Aim: We aimed to investigate IL-33 polymorphisms with risk of colorectal cancer (CRC). Materials & methods: IL-33 rs7025417 and rs1332290 were genotyped using a quantitative allelic Taqman assay. The expression of IL-33 mRNA was determined by real-time PCR and promoter activity was assayed using the Dual-Luciferase Reporter Assay. Results: The IL-33 rs7025417 CC genotype and C allele may decrease CRC risk. The IL-33 rs1332290 AC carriers had an increased risk of developing clinical Stage III–IV CRC. Lower levels of IL-33 mRNA were present in individuals with the rs7025417 CC genotype. Moreover, the rs7025417 C allele suppressed promoter activity of IL-33. Conclusion: These data suggest that the rs7025417 CC genotype may downregulate IL-33 mRNA and subsequently reduce the risk of CRC.