| Disease ID | Source | Name | Description |
| 619079 | OMIM | Inflammatory bowel disease 30 (IBD30) | A chronic, relapsing inflammation of the gastrointestinal tract with a complex etiology and a multifactorial inheritance pattern. It is subdivided into Crohn disease and ulcerative colitis phenotypes. Crohn disease may affect any part of the gastrointestinal tract from the mouth to the anus, but most frequently it involves the terminal ileum and colon. Bowel inflammation is transmural and discontinuous; it may contain granulomas or be associated with intestinal or perianal fistulas. In contrast, in ulcerative colitis, the inflammation is continuous and limited to rectal and colonic mucosal layers; fistulas and granulomas are not observed. Both diseases include extraintestinal inflammation of the skin, eyes, or joints. The disease may be caused by variants affecting the gene represented in this entry. A number of groups have studied the possible association between variant rs2043211 and inflammatory bowel disease (PubMed:17030188, PubMed:19319132, PubMed:23506543, PubMed:26462578). According to some studies involving a limited number of patients, this variant is associated with inflammatory bowel disease (PubMed:17030188, PubMed:19319132, PubMed:23506543). Such association is however not confirmed in studies involving a large number of patients (PubMed:26462578). Discrepancies between studies may be caused by the variable consequences of this polymorphism in the different isoforms (PubMed:29408806). Whereas rs2043211 introduces a stop codon after 'Cys-10' (Cys10Ter) in isoform 1, and therefore the likely formation of a downstream transcriptional start site for this isoform, it causes Ile-102 variation in isoform 5, due to the upstream start site (PubMed:29408806). Moreover, most patients bearing this polymorphism continue to express the slightly smaller but fully functional isoform 7, as a result of transcription downstream of the rs2043211 polymorphism (PubMed:29408806). |