Stress-induced phenotypic switching in Candida albicans

Area of Science:

• Microbiology
• Cell Biology
• Genetics

Background:

• Candida albicans is a human pathogen that can switch between white and opaque cell forms.
• This phenotypic switching affects virulence, mating, and biofilm formation.

Purpose of the Study:

• To investigate the common mechanism underlying white-to-opaque switching induced by various factors.
• To explore the role of cell growth inhibition in modulating this phenotypic transition.

Main Methods:

• Inducing white-to-opaque switching using genotoxic stress, oxidative stress, and DNA repair gene mutations.
• Artificially manipulating cell growth rates by altering CLB4 cyclin gene expression.
• Analyzing clinical isolates (P37005, L26) for growth rates and switching frequencies.
• Investigating the role of the Wor1 regulator in the switching mechanism.

Main Results:

• Diverse environmental and intrinsic factors increase white-to-opaque switching rates in C. albicans.
• Inhibition of cell growth was identified as a common mechanism promoting this switch.
• Slowing growth via CLB4 depletion increased switching; conversely, suppressing slow growth in clinical isolates reduced hyperswitching.
• Switching frequency sensitivity to Wor1 levels was observed.

Conclusions:

• Cellular growth inhibition is a key regulator of white-opaque phenotypic switching in Candida albicans.
• Understanding this mechanism provides insights into C. albicans pathogenesis and virulence.
• A model is proposed linking cell growth modulation to white-opaque switching frequencies via Wor1.