Related Experiment Video
Updated: Jun 8, 2026
08:40
Chronic Salmonella Infection Induced Intestinal Fibrosis
Published on: September 22, 2019
Genetic predictors of medically refractory ulcerative colitis
Talin Haritunians1, Kent D Taylor, Stephan R Targan
1Medical Genetics Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA. Talin.Haritunians@cshs.org
Inflammatory Bowel Diseases
|September 18, 2010
Summary
A genome-wide association study identified genetic markers for medically refractory ulcerative colitis (UC). A risk score using 46 SNPs can predict colectomy risk in UC patients, aiding clinical decisions.
Area of Science:
- Genetics
- Gastroenterology
- Immunology
Background:
- Acute severe ulcerative colitis (UC) presents a significant clinical challenge.
- Predicting colectomy risk in medically refractory UC (MR-UC) is crucial for early intervention.
- Genome-wide association studies (GWAS) offer a powerful tool for identifying genetic risk factors.
Purpose of the Study:
- To identify genetic variations contributing to medically refractory UC (MR-UC) using a GWAS.
- To develop a predictive model for colectomy risk in UC patients.
- To explore genetic pathways involved in severe UC pathogenesis.
Main Methods:
- A GWAS was conducted comparing 324 MR-UC patients with 537 non-MR-UC patients.
- Logistic regression and Cox proportional hazards models were employed for analysis.
- MR-UC patients were also compared with 2601 healthy controls.
Main Results:
- MR-UC was associated with more extensive disease and a positive family history of UC.
- A risk score comprising 46 single nucleotide polymorphisms (SNPs) explained 48% of colectomy risk variance.
- Significant associations were found with the major histocompatibility complex and the TNFSF15 (TL1A) locus.
Conclusions:
- A SNP-based risk scoring system can aid in predicting UC natural history alongside clinical parameters.
- Identifying genetic factors for disease severity may reveal novel therapeutic targets for severe UC.
- This study provides valuable insights into the genetic architecture of severe UC.
Related Concept Videos
01:20Inflammatory Bowel Disease II: Ulcerative Colitis
Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal BarrierA...
01:25Inflammatory Bowel Disease III: Crohn's Disease
Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
01:27Inflammatory Bowel Disease I: Ulcerative Colitis
Introduction
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...
01:30Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy
Various diagnostic tests are employed in the diagnostic process for Inflammatory Bowel Disease (IBD), particularly to differentiate between Crohn's disease and ulcerative colitis.
Diagnostic studies
A colonoscopy is the definitive screening test, distinguishing ulcerative colitis from other colon diseases with similar symptoms. During a colonoscopy test, inflamed mucosa with exudate ulcerations can be observed, and biopsies are taken to determine the histologic characteristics of the colonic...
Diagnostic studies
A colonoscopy is the definitive screening test, distinguishing ulcerative colitis from other colon diseases with similar symptoms. During a colonoscopy test, inflamed mucosa with exudate ulcerations can be observed, and biopsies are taken to determine the histologic characteristics of the colonic...
01:29Drugs for Treatment of Ulcerative Colitis in IBD
Ulcerative colitis is a chronic inflammatory condition primarily affecting the colon and rectum. The primary drugs used in the treatment of ulcerative colitis are aminosalicylates. They exhibit anti-inflammatory and immunosuppressive properties. They modulate inflammatory mediators and inhibit the activity of nuclear factor κB (NF-κB). Aminosalicylates also reduce inflammation by inhibiting prostaglandin and leukotriene production and decreasing neutrophil chemotaxis and superoxide generation.
01:11Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase
Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...