Abstract
The purpose of this study was to evaluate genome-wide DNA methylation changes in intestinal mucosa tissue of adult patients with Crohn's disease comprehensively. DNA methylation chip was used to analyze abnormal methylation sites among penetrating and non-penetrating intestinal mucosa tissue of Crohn's disease and normal intestinal mucosa tissue of healthy controls. Methylation abnormalities of different locus were verified by pyrosequencing and quantitative polymerase chain reaction. Differential DNA methylation sites were participated in the positive regulation of apoptosis and the positive regulation of IL-8 production and were enriched in signaling pathways related to inflammatory bowel disease and extracellular matrix receptor interaction signaling pathways. Correlation analysis showed that the methylation abnormalities of HLA-DRB1 (r = − 0.62, P < 0.001), MUC1 (r = − 0.45, P = 0.01), YPEL5 (r = − 0.55, P = 0.001) and CBLB (r = − 0.62, P < 0.001) were significantly negatively correlated with their relative expression levels. The degree of methylation abnormality of MUC1 was negatively correlated with the disease activity score of Crohn's disease (r = − 0.50, P = 0.01). Apoptosis, interleukin-8 production and abnormal extracellular matrix might be involved in the mechanism of penetrating intestinal mucosal lesions in Crohn's disease. The degree of abnormal methylation of MUC1 was negatively correlated with the disease activity of Crohn's disease.
Highlights
Crohn’s disease (CD) was a chronic recurrent intestinal disease that primarily affected the end of the small intestine and the beginning of the colon[1]
All 7 CD patients enrolled in the CD group were male, with an average age of 31.3 ± 8.3 years
We recruited a large cohort of CD patients and health control, and developed the pyrosequencing was used to verify the differential sites of DNA methylation screened by methylated chips, and MUC1, a new molecular marker
Summary
Crohn’s disease (CD) was a chronic recurrent intestinal disease that primarily affected the end of the small intestine and the beginning of the colon[1]. According to the 3237 differential DNA methylation sites screened by the methylation chips, CD penetrating intestinal mucosal tissue were compared with non-penetrating intestinal mucosal tissue for cluster analysis.
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