Related Experiment Video
Updated: Jul 6, 2026
06:58
Analysis of Interactions between Endobiotics and Human Gut Microbiota Using In Vitro Bath Fermentation Systems
Published on: August 23, 2019
Human gut microbiota and bifidobacteria: from composition to functionality
Francesca Turroni1, Angela Ribbera, Elena Foroni
1Department of Genetics, Anthropology and Evolution University of Parma, Parco Area delle Scienze 11a, 43100 Parma, Italy.
Antonie Van Leeuwenhoek
|March 14, 2008
Summary
The human gut microbiome, dominated by Bacteroidetes and Firmicutes, also includes important Actinobacteria like bifidobacteria. These bacteria significantly impact human physiology and immunity.
Area of Science:
- Microbiology
- Human Physiology
- Gut Ecology
Background:
- The human gut harbors trillions of bacterial cells, forming a complex microbial community.
- Novel culture-independent methods reveal Bacteroidetes and Firmicutes as dominant phyla.
- Actinobacteria, including bifidobacteria, play an underestimated role in gut ecology.
Purpose of the Study:
- To explore the functions and impact of the human gut microbiome on host physiology.
- To investigate the ecological interactions between gut commensals.
- To understand microbial adaptation strategies within the intestinal environment.
Main Methods:
- Utilized novel culture-independent approaches to study gut microbiota composition.
- Employed a murine model system for co-colonization experiments with Bifidobacterium longum and Bacteroides thetaiotaomicron.
- Conducted comparative analyses of individual human gut microbiomes.
Main Results:
- The gut microbiome significantly enhances metabolism of amino acids, glycan acids, xenobiotics, and vitamin biosynthesis.
- Bifidobacteria co-colonization expanded the diversity of polysaccharides targeted by Bacteroides and induced host innate immunity genes.
- Identified distinct infant and adult-type gut microbiota, highlighting adaptive strategies.
Conclusions:
- The human gut microbiome is crucial for host physiology, metabolism, and immunity.
- Interactions between specific bacterial species, like bifidobacteria and Bacteroides, modulate host responses.
- Gut microbiota composition varies significantly between infants and adults, reflecting adaptation to the intestinal environment.
Related Concept Videos
01:18Functions 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...
01:30Development 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...
01:22Introduction 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...
01:18Dysbiosis of the Gut Microbiota
The human gut microbiome includes a diverse array of microbial species, including beneficial commensals and opportunistic pathogens, which interact to support host health. These microbes contribute to essential functions such as nutrient metabolism, immune system modulation, and maintenance of intestinal barrier integrity. However, disruptions to this equilibrium—referred to as dysbiosis—can have widespread physiological consequences.Dysbiosis is often characterized by reduced microbial...
01:29Bacterial Flora of the Large Intestine
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.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
01:27Microbiota of the Large Intestine
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...