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Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

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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...
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Peptic ulcer disease, commonly called PUD, represents a multifaceted condition characterized by disruptions in the lining of the gastrointestinal (GI)  tract. Central to the protection of the gastrointestinal lining is the mucosal-bicarbonate barrier. This physiological defense mechanism is a formidable shield against the corrosive effects of gastric acid and pepsin secretion in the stomach. Its role is pivotal in maintaining the structural integrity of the stomach's inner lining.
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Chronic Bowel Disorders: Introduction01:17

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Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
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Peptic Ulcer Disease I: Introduction01:30

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Peptic Ulcer Disease (PUD) is characterized by mucosal excavation in the esophagus, stomach, pylorus, or duodenum. It can manifest as acute or chronic based on the extent and duration of mucosal involvement.
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Peptic Ulcer Disease II: Pathophysiology01:28

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Peptic Ulcer Disease (PUD) is characterized by the development of ulcers in the stomach or duodenal mucosa. Its pathophysiology is complex, involving a balance between damaging and protective elements.
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Inflammatory Bowel Disease II: Crohn's Disease01:30

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Inflammatory bowel disease, commonly known as IBD, refers to a collection of disorders that lead to persistent inflammation of the gastrointestinal tract. The two types of IBD are ulcerative colitis, which impacts the colon, and Crohn's disease, which can involve any part of the gastrointestinal segment.
Crohn's disease
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Pathogenic OTUD3 Mutations Predispose to Ulcerative Colitis Due to Barrier Dysfunction.

Rabina Giri1, Minyi Lee2, Graham Magor3

  • 1Faculty of Medicine, The University of Queensland, Woolloongabba, Queensland, Australia; Inflammatory Bowel Disease Group, Mater Research Institute - The University of Queensland, Translational Research Institute, Woolloongabba, Queensland, Australia.

Cellular and Molecular Gastroenterology and Hepatology
|October 9, 2025
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Summary
This summary is machine-generated.

Rare variants in the OTUD3 gene are linked to ulcerative colitis (UC) pathogenesis. OTUD3 is crucial for maintaining colonic epithelial barrier function and preventing colitis.

Keywords:
Barrier DysfunctionInflammationMutationUlcerative Colitis

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Area of Science:

  • Genetics
  • Gastroenterology
  • Immunology

Background:

  • Common genetic factors have a limited role in ulcerative colitis (UC) development.
  • Severe familial cases of UC may involve rare genetic variants affecting novel pathways.

Purpose of the Study:

  • To investigate the role of rare genetic variants in UC pathogenesis.
  • To identify novel genes and pathways involved in UC.

Main Methods:

  • Whole exome sequencing in a multigenerational family with UC.
  • Generation and analysis of Otud3-deficient mouse models (constitutive and intestinal-specific).
  • Assessment of OTUD3 expression in human tissues and cell lines, and functional studies of OTUD3 variants.

Main Results:

  • Otud3 deficiency in mice led to impaired colonic barrier integrity, increased ER stress, and spontaneous colitis.
  • Rare, damaging OTUD3 variants were enriched in UC patient cohorts.
  • Decreased OTUD3 expression was observed in the colonic epithelium of UC patients.

Conclusions:

  • OTUD3 is essential for maintaining colonic epithelial barrier function.
  • OTUD3 dysfunction contributes to the pathogenesis of ulcerative colitis.