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E. Coli Engineered to Diagnose Inflammatory Bowel Disease Source: boonchai wedmakawand/Getty Images May 17, 2021 Share Rice University researchers say they have engineered a bacterium with the necessary capabilities for diagnosing a human disease. The engineered strain of the gut bacteria E. coli senses pH and glows when it encounters acidosis, an acidic condition that often occurs during flareups of inflammatory bowel diseases like colitis, ileitis, and Crohn’s disease, according to the scientists. Researchers at the University of Colorado (CU) School of Medicine used the Rice-created organism in a mouse model of Crohn’s disease to show acidosis activates a signature set of genes. The corresponding genetic signature in humans has previously been observed during active inflammation in Crohn’s disease patients. The study (“Mucosal acidosis elicits a unique molecular signature in epithelia and intestinal tissue mediated by GPR31-induced CREB phosphor ....