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The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such...
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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...
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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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Related Experiment Video

Updated: Mar 20, 2026

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Does the brain listen to the gut?

Thomas Kuntz1, Jack Gilbert2

  • 1Department of Chemistry, University of Chicago, Chicago, United States.

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This summary is machine-generated.

Transplanting gut bacteria between mouse strains can alter behavior, overriding genetic predispositions. This highlights the significant influence of the gut microbiome on host characteristics.

Keywords:
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Area of Science:

  • Microbiology
  • Neuroscience
  • Genetics

Background:

  • The gut microbiome plays a crucial role in host physiology and behavior.
  • Genetic factors are traditionally considered primary determinants of an organism's traits and behaviors.

Purpose of the Study:

  • To investigate whether the gut microbiome can influence or override genetic predispositions in determining host behavior.
  • To explore the plasticity of behavior in response to microbial transplantation.

Main Methods:

  • Fecal microbiota transplantation (FMT) was performed between genetically distinct mouse strains.
  • Behavioral assays were conducted to assess specific behavioral phenotypes in recipient mice.
  • Genetic analysis confirmed the successful engraftment of donor microbiota.

Main Results:

  • Recipients exhibited behavioral patterns characteristic of the donor mouse strain, irrespective of their own genetic background.
  • Significant alterations in specific behaviors were observed post-transplantation, demonstrating a microbiome-induced phenotype shift.
  • The transplanted bacteria successfully colonized the recipient gut, confirming successful microbial transfer.

Conclusions:

  • Gut bacteria transplantation can profoundly influence host behavior, demonstrating a powerful role of the microbiome in shaping phenotypes.
  • Microbiome-mediated effects can override host genetics in determining behavioral outcomes.
  • These findings underscore the gut microbiome as a key modulator of host behavior and a potential therapeutic target.