Quorum Sensing in Extremophiles Remains Underexplored, Mini Review Argues

Microbes that thrive in extreme heat, cold, salinity, and acidity communicate with each other through quorum sensing, a cell-density-dependent system in which microorganisms coordinate gene expression and collective behavior by producing and detecting autoinducer molecules. A new mini review published in AMB Express on 23 September 2026 examines how this communication operates in four extremophilic groups—thermophiles, psychrophiles, halophiles, and acidophiles—and argues that the field has lagged far behind work on ordinary microbes.

According to the review by Kriti Sahni, Tanvi Rege, and Archana Mahadev Rao, quorum sensing is well researched in mesophiles, the organisms that live under moderate conditions, but its mechanisms and regulation in extremophiles remain comparatively underexplored. The authors also assess the strategies currently used to interfere with quorum sensing in these hardy organisms and find them wanting: existing approaches are described as narrow, isolate-specific, and often cytotoxic, meaning they may work only against particular strains and can harm the cells they target.

The review then turns to a possible alternative drawn from the plant world. Phytochemicals including cinnamaldehyde, curcumin, berberine, and resveratrol have demonstrated significant multitarget quorum sensing inhibition efficacy against LuxI/LuxR-type systems in mesophiles. The authors note that these pathways are homologously conserved across extremophilic lineages as well, which leads them to propose phytochemical-based inhibition as a scientifically supported yet largely unexplored avenue for addressing quorum sensing in extremophilic microorganisms.

The article is a mini review, published open access, and it is being shared early to provide faster access to peer-reviewed, accepted research; the version is citable and carries a permanent DOI but remains subject to further edits before the final Version of Record is released. As a review, it synthesizes and evaluates existing literature rather than presenting new experimental data, and its proposal for phytochemical inhibitors in extremophiles is framed as a research direction to be tested rather than a demonstrated result. The authors’ central argument is that the conservation of LuxI/LuxR-type signaling across lineages makes plant-derived compounds a promising starting point for future studies targeting the chemical conversations of organisms living at nature’s limits.

Subject of Research: Quorum sensing mechanisms and phytochemical-based inhibition strategies in extremophilic microorganisms

Article Title: Exploring quorum sensing in extremophiles: biological roles and phytochemical-based inhibition

Article References: Sahni, K., Rege, T., & Rao, A. M. (2026). Exploring quorum sensing in extremophiles: biological roles and phytochemical-based inhibition. AMB Express. https://doi.org/10.1186/s13568-026-02119-0

Image Credits: AI Generated

DOI: 10.1186/s13568-026-02119-0

Keywords: quorum sensing, extremophiles, thermophiles, psychrophiles, halophiles, acidophiles, autoinducers, phytochemicals, LuxI/LuxR, cinnamaldehyde, curcumin, mini review