Umeå University researchers map complex gut bacteria interactions

Researchers at Umeå University have mapped the interactions between 36 representative gut bacterial species, creating a comprehensive dataset published in Nature Communications. The study analyzed over 1,200 interactions to understand how microbial communities are formed and maintained within the human gut.

The findings indicate that inhibitory interactions are the dominant feature of the gut microbiome. Many bacteria limit the growth of others by altering their environment, specifically by increasing acidity through pH changes.

However, the study also identified specific mechanisms of cooperation. For instance, Clostridium perfringens promotes the growth of Mediterraneibacter gnavus via the release of extracellular vesicles. Additionally, Veillonella parvula was found to increase the pH of its surroundings, counteracting acidification and allowing acid-sensitive species like Parabacteroides merdae to grow more effectively.