Filamentation pathway

The filamentation pathway is a complex regulatory network in fungi, particularly Candida albicans, that governs the transition between yeast and hyphal growth forms (Sudbery, 2011, Nature Reviews Microbiology). This dimorphic switch is a fundamental virulence trait, enabling the pathogen to invade host tissues, form robust biofilms, and evade the immune system (Hogan & Sundstrom, 2009, Nature Reviews Microbiology). The pathway integrates various environmental signals—such as elevated temperature, neutral pH, and the presence of serum—through core signaling modules including the cAMP-PKA and MAPK cascades (Shapiro et al., 2011, Microbiology and Molecular Biology Reviews). Because filamentation is essential for pathogenicity but not for cell viability under all conditions, targeting this pathway represents an anti-virulence therapeutic strategy (Vila et al., 2017, Virulence). Such an approach aims to disarm the pathogen rather than kill it, which may exert less selective pressure for the development of antifungal resistance (Lu et al., 2014, Cell Reports). Key molecular components within this pathway include the adenylyl cyclase Cyr1, the protein kinase Pka1, and transcription factors such as Efg1 and Cph1. Small molecules like farnesol naturally inhibit this transition, while experimental inhibitors target specific kinases or heat shock proteins like Hsp90 that stabilize the pathway. Despite its importance, the filamentation pathway is considered a biological process rather than a single molecular target, as it encompasses a broad array of proteins and signaling events.

Other names

Hyphal growth pathwayYeast-to-hypha transition pathwayDimorphic transition pathwayCandida albicans filamentation signaling

Inhibition of the yeast-to-hypha morphological transition by targeting signaling components (e.g., cAMP/PKA or MAPK cascades) or downstream transcription factors.