EurekAlert -- What is believed to be the largest study of its kind for the genetic roots of inflammatory bowel diseases has suggested new links to Crohn’s Disease as well as further evidence that some people of Jewish descent are more likely to develop it. The study examined changes in DNA associated with the two most common forms of inflammatory bowel disease (IBD): Crohn’s Disease (CD), which is most frequently marked by inflammation of the final section of the small bowel (ileum) and parts of the colon, and ulcerative colitis (UC), an inflammation of the internal lining of the rectum and colon.