Assessment of DNA methylation at the interferon regulatory factor 5 ( IRF5 ) promoter region in inflammatory bowel diseases
2010
Background and aims
A 5-bp insertion–deletion (indel) polymorphism in the promoter of interferon regulatory factor 5 (IRF5) has been associated with inflammatory bowel diseases (IBD). This polymorphism generates an additional binding site for the transcription factor SP1 and has been shown to augment the expression of IRF5. Additionally, it affects a CpG dinucleotide-dense genomic region. These features of the indel suggested that it may influence the epigenetic regulation of IRF5. The aim of this study was to investigate the potential effect of the 5-bp indel on the methylation pattern of four CpG sites upstream of the polymorphism. Possible CpG site methylation differences in this region between healthy persons and individuals suffering from IBD were also tested.
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