Rhythmicity of the intestinal microbiota is regulated by gender and the host circadian clock

Aug 5, 2015Proceedings of the National Academy of Sciences of the United States of America

Daily cycles of gut bacteria vary by sex and the body’s internal clock

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Abstract

The abundance of Bacteroidetes in the fecal microbiota of mice exhibits circadian rhythmicity, particularly in female mice.

  • Circadian rhythms affect physiological and metabolic processes in mammals, including the fecal microbiota.
  • Deep sequencing analysis revealed that both the total amount of fecal bacteria and the composition of microbiota vary with the time of day.
  • Disruption of the circadian clock by deleting the Bmal1 gene eliminated rhythmic patterns in fecal microbiota for both male and female mice.
  • Bmal1 deletion led to changes in bacterial populations, with varying impacts based on the sex of the mice.
  • Sexual differences play a role in how the host circadian clock influences microbial composition.

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