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Bacterial Flora of the Large Intestine01:29

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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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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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The human body contains a monogastric digestive system. In a monogastric digestive system, the stomach only contains one chamber in which it digests food. Several other animal species also have monogastric digestive systems, including pigs, horses, dogs, and birds. This chapter, however, focuses on the human digestive system.
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Physiology of Enteric Nervous System and Gut Health01:05

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The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of the...
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Firmicutes is a diverse phylum of Gram-positive bacteria characterized by a low GC content in their genomes. This phylum includes organisms with monoderm or diderm cell envelopes, highlighting a complex evolutionary history. Firmicutes comprises several major orders, including Lactobacillales, Clostridiales, and Bacillales, which exhibit remarkable diversity in their morphology, metabolism, and ecological roles.The order Lactobacillales includes lactic acid bacteria, which are fermentative...
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The phylum Verrucomicrobiota comprises at least four characterized orders, with most species classified within the order Verrucomicrobiotales. Members of this phylum are either aerobic or facultatively aerobic, with the ability to ferment sugars. A notable exception is the genus Methylacidiphilum, which consists of aerobic methanotrophs. Additionally, some Verrucomicrobiota establish symbiotic relationships with protists. These bacteria are widely distributed across various environments,...
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Updated: Mar 3, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
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Gut microbiota - at the intersection of everything?

Patrice D Cani1

  • 1Université catholique de Louvain, Louvain Drug Research Institute, WELBIO (Walloon Excellence in Life sciences and BIOtechnology), Metabolism and Nutrition research group, Avenue E. Mounier, 73 box B1.73.11, B-1200 Brussels, Belgium.

Nature Reviews. Gastroenterology & Hepatology
|April 27, 2017
PubMed
Summary

The gut microbiota

Area of Science:

  • Microbiology
  • Human Health
  • Disease Etiology

Background:

  • The gut microbiota's role in diseases is increasingly studied.
  • Thousands of publications link gut microbiota to various conditions.
  • High expectations surround these findings, prompting critical evaluation.

Purpose of the Study:

  • To critically assess the reality of the gut microbiota's association with diseases.
  • To question the extent of the gut microbiota's influence amidst numerous publications.
  • To evaluate the potential for inflated expectations in this research area.

Main Methods:

  • Literature review and critical analysis of existing studies.
  • Examination of the association between gut microbiota and disease prevalence.

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  • Assessment of publication trends and reported effect sizes.

    • Main Results:

    • A significant body of research suggests a link between gut microbiota and disease.
    • The sheer volume of publications may lead to overestimation of the microbiota's impact.
    • Evidence quality and causality require careful consideration.

    Conclusions:

    • While associations exist, the true extent of the gut microbiota's role in disease requires further rigorous investigation.
    • Caution is advised against overstating findings due to potential publication bias and inflated expectations.
    • Future research should focus on establishing causality and clinical relevance.