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Functions of the Gut Microbiota

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The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...

Development of Human Microbiota

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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from the skin...

Microbiota of the Stomach and Small Intestine

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The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...

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Related Experiment Video

Updated: May 9, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Published on: October 15, 2019

Intestinal microbiota, diet and health.

Susan E Power¹, Paul W O'Toole¹, Catherine Stanton²

¹Department of Microbiology, University College Cork, Cork, Republic of Ireland.

The British Journal of Nutrition

|August 13, 2013

Summary

The human gut microbiota, dominated by Firmicutes and Bacteroidetes, influences health and disease. Probiotics show therapeutic potential, but their mechanisms, including non-viable strains, require further investigation.

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Last Updated: May 9, 2026

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

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Published on: October 15, 2019

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota

Published on: July 31, 2019

Area of Science:

Microbiology
Gastroenterology
Immunology

Background:

The human intestine hosts a complex microbial community (10^13-10^14 microorganisms), primarily Firmicutes and Bacteroidetes.
Microbiota composition is influenced by factors like age, diet, and antibiotics, and its dysbiosis is linked to inflammatory and metabolic diseases.

Purpose of the Study:

To provide a comprehensive overview of the human gut microbiota.
To explore factors influencing microbiota composition and the role of probiotics in health and disease.
To investigate the mechanisms of probiotic action, including non-viable strains.

Main Methods:

Literature review of human gut microbiota.
Analysis of factors affecting microbiota composition.
Review of studies on probiotic efficacy and mechanisms.

Main Results:

Gut microbiota composition is dynamic and linked to various health conditions.
Probiotics demonstrate potential in preventing and treating intestinal disorders.
The role of non-viable probiotics and their mechanisms of action warrant further research.

Conclusions:

Understanding gut microbiota and dysbiosis is crucial for disease etiology.
Probiotics offer therapeutic possibilities, but strain-specific mechanisms need elucidation.
Further research is needed to clarify the health benefits of non-viable probiotics.