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Related Concept Videos

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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Inflammatory Bowel Disease II: Crohn's Disease01:30

Inflammatory Bowel Disease II: Crohn's Disease

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Introduction
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
Crohn's disease is a chronic, systemic inflammatory bowel disease (IBD) that predominantly affects the gastrointestinal tract. It is marked by...
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Chronic Bowel Disorders: Introduction01:17

Chronic Bowel Disorders: Introduction

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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.
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...
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Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy01:30

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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...
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Drugs for Treatment of Crohn's Disease in IBD Using Biologic Agents: Anti-TNF01:24

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Tumor Necrosis Factor (TNF), a proinflammatory cytokine, contributes significantly to the inflammation seen in Crohn's disease. It exists as soluble TNF and membrane-bound TNF, with actions mediated through TNF receptors (TNFR). TNFR activation leads to the release of proinflammatory cytokines, T-cell activation, collagen production, and leukocyte migration, all contributing to inflammation in Crohn's disease. Anti-TNF monoclonal antibodies, namely infliximab (Remicade), adalimumab...
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Inflammatory Bowel Disease IV: Pharmacological Management01:29

Inflammatory Bowel Disease IV: Pharmacological Management

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Upon diagnosis, managing Inflammatory Bowel Disease (IBD) involves addressing several crucial aspects. The primary goals include resting the bowel, correcting malnutrition, and providing symptomatic relief. Resting the bowel may consist of medications to reduce inflammation and promote healing. Correcting malnutrition is essential, often requiring dietary adjustments and nutritional supplements. Symptomatic relief aims to ease pain, diarrhea, and other discomforts in IBD.
Pharmacologic...
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An Integrated Taxonomy for Monogenic Inflammatory Bowel Disease.

Chrissy Bolton1, Christopher S Smillie2, Sumeet Pandey3

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Monogenic inflammatory bowel disease (IBD) gene functions were classified using a novel taxonomy. This model integrates multi-omics data to reveal cellular networks and guide genomic diagnostics for IBD.

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Area of Science:

  • Genetics
  • Immunology
  • Gastroenterology

Background:

  • Monogenic forms of inflammatory bowel disease (IBD) highlight the critical roles of specific genes in maintaining immune tolerance and gut homeostasis.
  • Understanding these genetic underpinnings is crucial for developing targeted diagnostics and therapies.

Purpose of the Study:

  • To develop a comprehensive taxonomy model for monogenic IBD genes.
  • To classify genes based on syndromic features, treatment response, and multi-omics data.
  • To explore genotype-phenotype associations and cellular networks in monogenic IBD.

Main Methods:

  • A taxonomy model was built by assessing 165 disorders and prioritizing genes based on IBD penetrance.
  • Multi-omics datasets, including bulk and single-cell RNA sequencing and proteomes, were integrated.
  • Genes were classified using overlapping syndromic features, response to hematopoietic stem cell transplantation, and expression profiles across diverse cell types.

Main Results:

  • A quantitative taxonomy was established for 102 monogenic IBD genes, defining their cellular landscape.
  • Distinct cellular networks and expression profiles in understudied cell types (e.g., CD8+ T cells, neutrophils) were identified.
  • Genotype-phenotype associations, including perianal disease and defective antimicrobial activity, were defined, revealing overlaps with polygenic IBD.

Conclusions:

  • The developed taxonomy integrates genetic, clinical, and multi-omic data, forming a foundation for genomic diagnostics.
  • It provides testable hypotheses for understanding disease mechanisms and predicting treatment responses in monogenic IBD.
  • This approach aids in elucidating the complex interplay of genes, cells, and pathways in IBD pathogenesis.