Contact-Dependent Growth Inhibition Mechanisms in Bacterial Systems
Summary
Contact-dependent growth inhibition (CDI) encompasses a suite of intercellular antagonistic and cooperative mechanisms by which bacteria deliver toxic or regulatory molecules directly to adjacent cells. Central to CDI are modular effector proteins, often exported via two-partner secretion pathways or specialised secretion machines, which bear polymorphic C-terminal toxin domains. Cognate immunity proteins neutralise these toxins in producing cells, ensuring allele-specific self-protection. Beyond CDI, related systems include rearrangement hotspot (Rhs) loci, type VI secretion systems and outer membrane exchange modules, all of which exploit direct cell–cell contact to discriminate kin, shape population structure and influence biofilm architecture. These mechanisms confer competitive advantages in diverse habitats, from the gut microbiome to soil communities, and can modulate cooperative behaviours such as biofilm formation or fruiting-body development. The global significance of contact-dependent systems lies in their roles in pathogen colonisation, microbiome stability and the emergence of multidrug-resistant strains, making them attractive targets for novel antimicrobial interventions and synthetic biology applications.
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Contact-Dependent Growth Inhibition Mechanisms in Bacterial Systems publication trend
The graph below shows the total number of articles in contact-dependent growth inhibition mechanisms in bacterial systems across all publications each year (not limited to Nature Index journals).
Technical terms
Contact-dependent growth inhibition (CDI): A mechanism in which bacteria deliver toxic effectors to adjacent cells via direct contact, inhibiting their proliferation.
CdiA/CdiB two-partner secretion pathway: A system in Gram-negative bacteria where CdiB facilitates outer membrane translocation of the CdiA effector protein carrying a toxic C-terminal domain.
Polymorphic toxin: A modular protein having variable C-terminal toxin domains that determine target specificity and mode of action.
Immunity protein: A small, allele-specific protein co-expressed with a toxin that neutralises its activity within the producer cell.
Outer membrane exchange (OME): A process in myxobacteria whereby cells fuse outer membranes to share lipoproteins and deliver toxins for kin discrimination.
References
- Cell motility empowers bacterial contact weapons. The ISME Journal: Multidisciplinary Journal of Microbial Ecology (2024).
- Infectious polymorphic toxins delivered by outer membrane exchange discriminate kin in myxobacteria. eLife (2017).
- Identification of Functional Toxin/Immunity Genes Linked to Contact-Dependent Growth Inhibition (CDI) and Rearrangement Hotspot (Rhs) Systems. PLOS Genetics (2011).
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