Epigenetic phase variation in the gut microbiome enhances bacterial adaptation
Open accessPublished version of a preprint
Abstract
The human microbiome continuously adapts to variations in diet and host physiology. Epigenetic phase variation (ePV) mediated by bacterial DNA methylation can generate phenotypic heterogeneity within clonal populations. ePVs have been characterized in human pathogens, but their roles in commensals remain unclear. Here, we cataloged ePVs in infant and adult gut microbiomes, revealing genome-wide and site-specific ePV in response to antibiotics and fecal microbiota transplantation. Long-read metagenomics revealed genome-wide ePV mediated by structural variations of DNA methyltransferases. Analysis of public short-read metagenomic datasets further revealed a high prevalence of genome-wide ePVs in the human microbiome. Site-specific ePVs were identified and associated with antibiotics or probiotic engraftment. Focusing on an Akkermansia muciniphila isolate, we find a specific ePV regulating mucC, a gene of unknown function but whose heterologous expression enhances bacterial tolerance to antibiotics via a bet-hedging strategy. Thus, epigenetic modifications are used by gut bacteria to adapt to fluctuating environments.
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- Authors
- Ni, M., Junker, K., Liu, Y., Fan, Y., Li, Y., Qiao, W., Zhang, X.-S., Ksiezarek, M., Mead, E. A., Tourancheau, A., Jiang, W., Blaser, M. J., Valdivia, R. H., Davey, L. E., & Fang, G.
- Affiliations
- Icahn School of Medicine at Mount Sinai (US)
- University of Victoria (CA)
- Rutgers, The State University of New Jersey (US)
- Duke University (US)
- Corresponding author
- Fang, Gang
- ORCID
- Venue
- Cell Host & Microbe
- Publisher
- Elsevier BV
- Published
- 2026-06
- Volume
- 34
- Issue
- 6
- Pages
- 1033-1049.e8
- ISSN
- 1931-3128 (ISSN-L)
- PMC
- PMC13196444
- OpenAlex
- W4406289903
- Cited by
- 13
- References
- 9
- Citations by year
- 2026: 11 · 2025: 2
- FWCI
- 22.73
- Type
- journal article
- Language
- en
- Open access
- green
- doi.org
- Licence
- cc-by-nc-nd
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
- www.elsevier.com/open-access/userlicense/1.0/ (am, 374 d)
- doi.org/10.15223/policy-017 (stm-asf)
- doi.org/10.15223/policy-037 (stm-asf)
- doi.org/10.15223/policy-012 (stm-asf)
- doi.org/10.15223/policy-029 (stm-asf)
- doi.org/10.15223/policy-004 (stm-asf)
- Locations
- Cell Host & Microbe (publishedVersion)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed Central (submittedVersion, cc-by-nc-nd)
- Funders
- National Institute of General Medical Sciences
- Canadian Institutes of Health Research
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
- Keywords
- DNA methylation, gut microbiota, bacterial adaptation, DNA methyltransferases, structural variants, bet-hedging, Akkermansia muciniphila, antibiotic tolerance, fecal microbiota transplantation, probiotics, infant gut microbiota, clonal heterogeneity, gene expression regulation
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