Cyclic di-GMP (c-di-GMP) is a highly conserved bacterial second messenger that regulates important processes such as motility, biofilm formation and virulence. In this review, we investigate the architecture and regulatory functions of c-di-GMP signaling in classical Bordetella species, including B. bronchiseptica, B. parapertussis and B. pertussis. We examine how the c-di-GMP signaling pathway interacts with the BvgAS two-component system and other signaling pathways to coordinate virulence gene expression and surface-associated behaviors in these respiratory pathogens. In particular, we highlight the functions of characterized diguanylate cyclases (DGCs), phosphodiesterases (PDEs) and dual-domain proteins, focusing on regulatory modules such as the BdcA-DdpA scaffold complex, the oxygen-sensing DGC BpeGReg and the LapD-LapG proteolytic switch that controls BrtA adhesin. We also propose a model for the function of BvgR, a PDE-like protein lacking catalytic residues, and discuss how c-di-GMP suppresses the type III secretion system. Importantly, we highlight the diversity of the c-di-GMP network in classical Bordetella species, likely reflecting their evolutionary specialization. To conclude, we outline important open questions and suggest future research directions, including the identification of sensory ligands and c-di-GMP effectors. Overall, our review illustrates the importance of c-di-GMP as a critical, but still incompletely understood, regulatory hub in Bordetella pathogenesis.

Instituto de Biotecnología y Biología Molecular CCT La Plata CONICET Departamento de Ciencias Biológicas Facultad de Ciencias Exactas Universidad Nacional de La Plata La Plata 1900 Argentina

Laboratory of Infection Biology Institute of Microbiology of the Czech Academy of Sciences Prague 142 00 Czech Republic

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