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Related Concept Videos

Irritable Bowel Syndrome I: Introduction01:17

Irritable Bowel Syndrome I: Introduction

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Irritable Bowel Syndrome (IBS) is characterized by functional disturbances in the gastrointestinal system, presenting a cluster of symptoms without evident structural or biochemical abnormalities. It primarily affects the large intestine and may cause abdominal pain, bloating, excessive gas, diarrhea, constipation, or both.
IBS is a chronic condition that can persist over a long period or recur frequently.
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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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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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Inflammatory Bowel Disease II: Crohn's Disease01:30

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The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
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Inflammatory bowel disease: between genetics and microbiota.

Nour Younis1, Rana Zarif1, Rami Mahfouz2

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Summary

Inflammatory bowel disease (IBD) is a chronic gastrointestinal condition influenced by genetics and the microbiome. Genetic testing for key IBD-associated genes can significantly improve diagnosis and evaluation.

Keywords:
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Area of Science:

  • Gastroenterology
  • Immunology
  • Genetics

Background:

  • Inflammatory bowel disease (IBD) encompasses Crohn's disease (CD) and Ulcerative Colitis (UC), characterized by chronic gastrointestinal inflammation.
  • IBD pathogenesis involves a complex interplay of genetic susceptibility, environmental factors, and the gut microbiome.
  • Distinct clinical presentations and inflammatory patterns differentiate CD and UC.

Purpose of the Study:

  • To review the genetic underpinnings of Inflammatory Bowel Disease.
  • To highlight key genes associated with increased IBD risk.
  • To propose the utility of genetic panels in IBD diagnosis.

Main Methods:

  • Review of genetic loci associated with IBD.
  • Identification of highly investigated and strongly linked IBD susceptibility genes.
  • Discussion of the role of specific genes including NOD2, ATG16L1, and IL23R.

Main Results:

  • Approximately 200 loci have been linked to IBD risk.
  • Several genes, such as NOD2, ATG16L1, IRGM, LRRK2, PTPN2, IL23R, IL10, and others, are significantly associated with IBD.
  • These genetic factors contribute to the multifactorial nature of IBD.

Conclusions:

  • Genetic predisposition is a critical factor in IBD development.
  • Targeted genetic analysis can provide valuable insights into IBD.
  • Incorporating a genetic panel for key IBD genes may enhance diagnostic accuracy and patient evaluation.