Daniel S Levic, Donna Niedzwiecki, Apoorva Kandakatla, Norah S Karlovich, Arjun Juneja, Jieun Park, Christina Stolarchuk, Shanté Adams, Jason R Willer, Matthew R Schaner, Grace Lian, Caroline Beasley, Lindsay Marjoram, Ann D Flynn, John F Valentine, Jane E Onken, Shehzad Z Sheikh, Erica E Davis, Kimberley J Evason, Katherine S Garman, Michel Bagnat
BACKGROUND AND AIMS: Inflammatory Bowel Diseases (IBD) are chronic inflammatory conditions influenced heavily by environmental factors. DNA methylation is a form of epigenetic regulation linking environmental stimuli to gene expression changes and inflammation. Here, we investigated how DNA methylation of the TNF promoter differs between inflamed and uninflamed mucosa of IBD patients, including anti-TNF responders and non-responders. METHODS: We obtained mucosal biopsies from 200 participants (133 IBD and 67 controls) and analyzed TNF promoter methylation using bisulfite sequencing, comparing inflamed with uninflamed segments, in addition to paired inflamed/uninflamed samples from individual patients...
February 6, 2024: medRxiv