@article {1229, title = {Genetic predictors of medically refractory ulcerative colitis.}, journal = {Inflamm Bowel Dis}, volume = {16}, year = {2010}, month = {2010 Nov}, pages = {1830-40}, abstract = {

BACKGROUND: Acute severe ulcerative colitis (UC) remains a significant clinical challenge and the ability to predict, at an early stage, those individuals at risk of colectomy for medically refractory UC (MR-UC) would be a major clinical advance. The aim of this study was to use a genome-wide association study (GWAS) in a well-characterized cohort of UC patients to identify genetic variation that contributes to MR-UC.

METHODS: A GWAS comparing 324 MR-UC patients with 537 non-MR-UC patients was analyzed using logistic regression and Cox proportional hazards methods. In addition, the MR-UC patients were compared with 2601 healthy controls.

RESULTS: MR-UC was associated with more extensive disease (P = 2.7 {\texttimes} 10(-6)) and a positive family history of UC (P = 0.004). A risk score based on the combination of 46 single nucleotide polymorphisms (SNPs) associated with MR-UC explained 48\% of the variance for colectomy risk in our cohort. Risk scores divided into quarters showed the risk of colectomy to be 0\%, 17\%, 74\%, and 100\% in the four groups. Comparison of the MR-UC subjects with healthy controls confirmed the contribution of the major histocompatibility complex to severe UC (peak association: rs17207986, P = 1.4 {\texttimes} 10(-16)) and provided genome-wide suggestive association at the TNFSF15 (TL1A) locus (peak association: rs11554257, P = 1.4 {\texttimes} 10(-6)).

CONCLUSIONS: A SNP-based risk scoring system, identified here by GWAS analyses, may provide a useful adjunct to clinical parameters for predicting the natural history of UC. Furthermore, discovery of genetic processes underlying disease severity may help to identify pathways for novel therapeutic intervention in severe UC.

}, keywords = {Acute Disease, Adolescent, Adult, Cohort Studies, Colectomy, Colitis, Ulcerative, Female, Genetic Loci, Genome-Wide Association Study, Humans, Major Histocompatibility Complex, Male, Polymorphism, Single Nucleotide, Risk Factors, Severity of Illness Index, Tumor Necrosis Factor Ligand Superfamily Member 15, Young Adult}, issn = {1536-4844}, doi = {10.1002/ibd.21293}, author = {Haritunians, Talin and Taylor, Kent D and Targan, Stephan R and Dubinsky, Marla and Ippoliti, Andrew and Kwon, Soonil and Guo, Xiuqing and Melmed, Gil Y and Berel, Dror and Mengesha, Emebet and Psaty, Bruce M and Glazer, Nicole L and Vasiliauskas, Eric A and Rotter, Jerome I and Fleshner, Phillip R and McGovern, Dermot P B} } @article {1174, title = {Genome-wide association identifies multiple ulcerative colitis susceptibility loci.}, journal = {Nat Genet}, volume = {42}, year = {2010}, month = {2010 Apr}, pages = {332-7}, abstract = {

Ulcerative colitis is a chronic, relapsing inflammatory condition of the gastrointestinal tract with a complex genetic and environmental etiology. In an effort to identify genetic variation underlying ulcerative colitis risk, we present two distinct genome-wide association studies of ulcerative colitis and their joint analysis with a previously published scan, comprising, in aggregate, 2,693 individuals with ulcerative colitis and 6,791 control subjects. Fifty-nine SNPs from 14 independent loci attained an association significance of P < 10(-5). Seven of these loci exceeded genome-wide significance (P < 5 x 10(-8)). After testing an independent cohort of 2,009 cases of ulcerative colitis and 1,580 controls, we identified 13 loci that were significantly associated with ulcerative colitis (P < 5 x 10(-8)), including the immunoglobulin receptor gene FCGR2A, 5p15, 2p16 and ORMDL3 (orosomucoid1-like 3). We confirmed association with 14 previously identified ulcerative colitis susceptibility loci, and an analysis of acknowledged Crohn{\textquoteright}s disease loci showed that roughly half of the known Crohn{\textquoteright}s disease associations are shared with ulcerative colitis. These data implicate approximately 30 loci in ulcerative colitis, thereby providing insight into disease pathogenesis.

}, keywords = {Colitis, Ulcerative, Genetic Predisposition to Disease, Genome-Wide Association Study, Humans, Membrane Proteins, Meta-Analysis as Topic, Polymorphism, Single Nucleotide, Receptors, IgG}, issn = {1546-1718}, doi = {10.1038/ng.549}, author = {McGovern, Dermot P B and Gardet, Agn{\`e}s and T{\"o}rkvist, Leif and Goyette, Philippe and Essers, Jonah and Taylor, Kent D and Neale, Benjamin M and Ong, Rick T H and Lagac{\'e}, Caroline and Li, Chun and Green, Todd and Stevens, Christine R and Beauchamp, Claudine and Fleshner, Phillip R and Carlson, Marie and D{\textquoteright}Amato, Mauro and Halfvarson, Jonas and Hibberd, Martin L and L{\"o}rdal, Mikael and Padyukov, Leonid and Andriulli, Angelo and Colombo, Elisabetta and Latiano, Anna and Palmieri, Orazio and Bernard, Edmond-Jean and Deslandres, Colette and Hommes, Daan W and de Jong, Dirk J and Stokkers, Pieter C and Weersma, Rinse K and Sharma, Yashoda and Silverberg, Mark S and Cho, Judy H and Wu, Jing and Roeder, Kathryn and Brant, Steven R and Schumm, L Phillip and Duerr, Richard H and Dubinsky, Marla C and Glazer, Nicole L and Haritunians, Talin and Ippoliti, Andy and Melmed, Gil Y and Siscovick, David S and Vasiliauskas, Eric A and Targan, Stephan R and Annese, Vito and Wijmenga, Cisca and Pettersson, Sven and Rotter, Jerome I and Xavier, Ramnik J and Daly, Mark J and Rioux, John D and Seielstad, Mark} }