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Vacuolar dynamics during the morphogenetic transition in Candida albicans
1The Aberdeen Fungal Group, School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK.
FEMS Yeast Research
|December 5, 2008
Summary
Candida albicans vacuole segregation differs between yeast and hyphal forms. Hyphae exhibit filamentous vacuole structures, with motility dependent on actin, not microtubules.
Area of Science:
- Cell Biology
- Mycology
- Fungal Pathogenesis
Background:
- Morphogenetic transitions in Candida albicans (yeast, pseudohyphal, true hyphal) are cell cycle-coordinated.
- Large vacuoles in true hyphae influence cell size, cell cycle, and branching frequency.
Purpose of the Study:
- To investigate the dynamic process of vacuolar segregation in the three morphological forms of Candida albicans.
- To elucidate the mechanisms underlying vacuole segregation and motility in C. albicans.
Main Methods:
- Live-cell imaging techniques were employed to observe vacuolar dynamics.
- Inhibitor studies were conducted to determine the cytoskeletal dependence of vacuole motility.
Main Results:
- Pseudohyphae and true hyphae display a filamentous vacuole segregation structure, distinct from yeast vacuole vesicle streams.
- Vacuole motility in growing hyphae involves retrograde transport, adhesion to septa, and occasional bisection during cytokinesis.
- Vacuole motility was found to be actin-dependent and microtubule-independent.
Conclusions:
- Vacuolar segregation mechanisms vary significantly with Candida albicans morphology.
- Actin-based transport is crucial for vacuole dynamics in hyphal growth.
- Understanding these processes offers insights into fungal cell cycle regulation and morphogenesis.
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