Circadian Disruption Changes Gut Microbiome Taxa and Functional Gene Composition.

Area of Science:

• Microbiology
• Chronobiology
• Gastroenterology

Background:

• Circadian rhythm disruption and gut microbiome alterations are linked to poor host health.
• The connection between circadian disruption and gut microbiome changes requires further investigation.

Purpose of the Study:

• To determine if circadian rhythm disruption affects gut microbial gene expression.
• To investigate if altered light-dark cycles impact host vulnerability to intestinal dysfunction.

Main Methods:

• Mice were exposed to constant light or normal light-dark cycles for 4 weeks.
• Stool samples were analyzed using metatranscriptomics.
• Intestinal barrier function was assessed.

Main Results:

• Circadian disruption increased Ruminococcus torques and decreased Lactobacillus johnsonii.
• Genes promoting beneficial immune responses were downregulated.
• Genes for lipopolysaccharide synthesis and transport were upregulated, increasing intestinal dysfunction.

Conclusions:

• Altered light-dark cycles disrupt the gut microbiome composition and function.
• Circadian disruption exacerbates intestinal barrier dysfunction.
• This highlights the link between environmental light changes, gut health, and disease susceptibility.