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Introduction to the Human Microbiota

Introduction to the Human Microbiota

Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity, and disease...

Development of Human Microbiota

Development of Human Microbiota

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...

Functions of the Gut Microbiota

Functions of the Gut Microbiota

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...

Microbiota of the Large Intestine

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The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...

Microbial Interactions: Parasitism

Microbial Interactions: Parasitism

Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...

The Oral Microbiota

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The oral microbiome includes a complex ecosystem comprising over 700 microbial species, identified through genomic sequencing and culture-based analyses to date. This community includes a core microbiome, found universally among individuals, and a variable component influenced by environmental factors such as diet, lifestyle, and host genetics. Site-specific conditions, including oxygen gradients, pH levels, and nutrient availability, determine the spatial distribution of these microorganisms...

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Updated: May 12, 2026

Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems

Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems

Published on: August 23, 2019

Exploring host-microbiota interactions in animal models and humans.

Aleksandar D Kostic¹, Michael R Howitt, Wendy S Garrett

¹Harvard School of Public Health, Boston, Massachusetts 02115, USA.

Genes & Development

|April 18, 2013

Summary

The gut microbiome, a complex symbiosis between animals and bacteria, significantly impacts health and disease. Model systems are crucial for understanding these host-microbiota interactions and their implications.

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Area of Science:

Microbiology
Ecology
Genetics
Biomedical Sciences

Background:

Animals and bacteria have coevolved for millions of years.
The meta'omics revolution has increased interest in the gut microbiome's role in physiology and disease.
Gut microbiome research is interdisciplinary, integrating biomedical, ecological, and computational approaches.

Purpose of the Study:

To explore how model systems advance the understanding of host-microbiota interactions.
To examine the symbiosis between animals and bacteria in health and disease.
To review recent findings in human microbiome studies.

Main Methods:

Utilizing experimental model systems (e.g., mice, fish, insects, Hawaiian bobtail squid) to study host-microbiota homeostasis.
Applying meta'omics sequencing and advanced analytic pipelines.
Integrating data from biomedical sciences, ecology, and computational biology.

Main Results:

Model systems provide critical insights into the construction and maintenance of host-microbiota homeostasis.
Understanding host-microbiota interactions is key to unraveling the complex interplay of environment, genetics, and health.
Recent human microbiome studies offer further understanding of these complex relationships.

Conclusions:

Experimental models are instrumental in deciphering the intricate mechanisms of host-microbiota symbiosis.
A deeper understanding of the gut microbiome is essential for advancing human health and disease research.
Continued interdisciplinary research, leveraging model systems and human studies, will illuminate microbiome functions.