Epigenetic Regulation by Gut Microbiota

Epigenetic regulation by gut microbiota refers to the ways in which microbial communities in the intestine modulate the chemical marks on host DNA and histones, thereby shaping gene expression without altering the genetic code itself. Microbial metabolites—most notably short-chain fatty acids such as butyrate, propionate and acetate—serve as substrates or inhibitors of enzymes that write, erase or read epigenetic marks. These interactions influence key physiological processes including immune tolerance, energy metabolism, barrier integrity and development of intestinal tissues. Conversely, host epigenetic states can affect the composition and function of the microbial community, forming a bidirectional epigenome–microbiome axis. This dynamic interplay has profound implications for health and disease, from postnatal intestinal maturation to susceptibility to metabolic disorders and inflammatory conditions. Understanding these mechanisms paves the way for strategies such as dietary modulation, probiotics or small-molecule epigenetic therapies to restore homeostasis or prevent pathology.

Research from Nature Portfolio

Studies have demonstrated that microbial-derived metabolites directly influence histone post-translational modifications in the colon. In one foundational investigation, butyrate and related short-chain fatty acids were shown to inhibit class I histone deacetylases in intestinal epithelial cells, leading to elevated levels of histone crotonylation and altered transcriptional programmes linked to cell cycle progression and barrier function. Depletion of the gut microbiota caused a marked loss of these modifications, confirming the microbial origin of the regulatory signal. In a complementary study of inflammatory bowel disease, comparisons of inflamed and non-inflamed colonic mucosa revealed distinct microbial communities associated with altered DNA methylation patterns. These epigenetic signatures not only improved classification of disease state but also correlated with enrichment of pro-inflammatory bacterial taxa, suggesting that microbial shifts can drive host epigenomic reprogramming and modulate local immune responses.

Epigenetic Regulation by Gut Microbiota publication trend

The graph below shows the total number of articles in epigenetic regulation by gut microbiota across all publications each year (not limited to Nature Index journals).

Technical terms

DNA methylation: Addition of a methyl group to cytosine bases in DNA, often associated with gene repression.

Histone deacetylases (HDACs): Enzymes that remove acetyl groups from histone proteins, leading to chromatin condensation and reduced gene transcription.

Histone crotonylation: A post-translational modification of histones by addition of crotonyl groups, linked to active gene expression.

Short-chain fatty acids (SCFAs): Microbial fermentation products (e.g. butyrate, propionate) that serve as energy sources and epigenetic modulators.

Epigenome–microbiome axis: The dynamic, two-way communication pathway between host chromatin modifications and gut microbial composition or activity.

References

1. Microbiota derived short chain fatty acids promote histone crotonylation in the colon through histone deacetylases. Nature Communications (2018).
2. Colonic microbiota is associated with inflammation and host epigenomic alterations in inflammatory bowel disease. Nature Communications (2020).
3. Unraveling host regulation of gut microbiota through the epigenome–microbiome axis. Trends in Microbiology (2024).
4. Gut Microbiota Dysbiosis, Oxidative Stress, Inflammation, and Epigenetic Alterations in Metabolic Diseases. Antioxidants (2024).
5. The potential of short-chain fatty acid epigenetic regulation in chronic low-grade inflammation and obesity. Frontiers in Immunology (2024).
6. Postnatal epigenetic regulation of intestinal stem cells requires DNA methylation and is guided by the microbiome. Genome Biology (2015).