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Phase variation-mediated bacterial functional plasticity as a lens for understanding microbe‒host interactions.

Shaqed Carasso¹, Melody Kasher-Dvora¹, Tal Gefen¹

¹Department of Cell Biology and Cancer Science, Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Rappaport Technion Integrated Cancer Center (RTICC), Haifa, Israel.

|June 17, 2026

Summary

The human gut microbiome is more dynamic than previously thought. Bacterial functional plasticity, driven by phase variation, allows microbes to rapidly adapt their activity and phenotype, impacting host health.

Keywords:

Bacterial functional plasticity gut microbiome host–microbe interactions phase variation

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Area of Science:

Microbiology
Immunology
Genomics

Background:

The human gut microbiome influences host physiology and disease.
Metagenomics reveals microbial composition but not real-time interactions.
Microbial functional roles are complex and not solely determined by species identity.

Purpose of the Study:

To highlight bacterial functional plasticity as key to host-microbe interactions.
To review phase variation as a primary mechanism of this plasticity.
To reframe the microbiome as a dynamic, adaptable system.

Main Methods:

Review of existing literature on bacterial functional plasticity and phase variation.
Integration of genomic, ecological, and host-response data.
Focus on mechanisms like DNA inversions and repeat modifications.

Main Results:

Phase variation is a conserved mechanism enabling rapid microbial adaptation.
Phase-variable mechanisms are prevalent across diverse gut bacteria.
These mechanisms have significant regulatory, ecological, and immunological impacts.

Conclusions:

The gut microbiome is a functionally dynamic system, not static.
Understanding microbial adaptation is crucial for microbiome research applications.
Mechanistic frameworks are needed to link microbial strategies to host outcomes.