Can Your Gut Bacteria Influence Behavior?

 A recent study by Communications Biology explores how the gut microbiome may play a role in animal domestication by influencing behavior. Using foxes from the Belyaev Farm-Fox Experiment, researchers compared gut bacteria between “tame” foxes (friendly toward humans) and “aggressive” foxes.

They found that tame foxes had lower gut microbial diversity and a reduction in bacteria linked to fear and aggression. Additionally, the microbiome of tame foxes showed enrichment in pathways like glutamate degradation, which is important because glutamate is a neurotransmitter involved in brain signaling and behavior.

Since all foxes were raised in the same environment and given identical diets, these differences suggest that behavioral selection (tameness vs aggression) is linked to changes in the gut microbiome, not just genetics or environment. The study highlights the importance of the microbiota–gut–brain axis, a system where gut microbes can influence brain function through metabolites, immune signaling, and even gene expression. 

I think this is really interesting because we usually think behavior is controlled only by genes or the brain, but this shows that bacteria in your gut might also play a role. It kind of changes how we think about evolution and domestication—not just as changes in DNA, but also changes in the microbiome.

Source: https://www.nature.com/articles/s42003-026-09717-5

Additional Source: https://my.clevelandclinic.org/health/body/25201-gut-microbiome

Aging in bacteria

 The evolutionary Demography research group at Freie Universitat Berlin studied the differences in the aging process in different samples of E. coli across more than 100 generations, with genetically identical bacteria and identical environment. They discovered a difference in the aging process of these bacteria and found that the aging process from mother to daughter cell. The study found a specific pole at the end of the rod shaped bacteria that got darker as the bacteria aged, meaning that the organism produced less proteins over time, but this behavior did not necessarily take place in the daughter cells, or the cells surrounding it in the same environment, meaning that these E. coli groups have different individualistic aging processes.

An article for the American Society for Microbiology pivots this topic in a different direction, showing that E. coli age in a different way by losing symmetry during multiple instances of binary fission. Showing that parent cells have a tendency to perform the essential reproductive functions over many different generations in comparison to the daughter cells. Eventually, leading for different kinds of mutations that make them die off, but also increasing population fitness.

I think that understanding the process of aging in bacteria is tremendously important when we attempt to understand the way that microbial communities and bacterial communities exist and distribute themselves throughout different periods of time. Do communities that exist in semiaquatic systems age and disappear because of the way they function? Just some thoughts that come into my head. I don’t know if understanding bacterial aging is as helpful to understanding human aging since they are functionally different, understanding stress factors and the way that both kinds of organisms are affected by it is a different kind of question. Overall nice findings and it is very interesting to know that there are scientists studying and reproducing these groundbreaking experiments with simple set ups but objective observations.

https://asm.org/articles/2024/september/do-bacteria-age

https://phys.org/news/2024-11-unexpected-differences-genetically-identical-bacteria.html