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Hyphal development in Candida albicans from different cell states.

Chang Su1, Jing Yu1, Yang Lu2

  • 1Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, 430072, China.

Current Genetics
|May 26, 2018
PubMed
Summary

Candida albicans forms hyphae without dilution via N-Acetylglucosamine (GlcNAc) activating Ngs1. This leads to BRG1 expression, which represses NRG1, promoting fungal virulence and potential drug targets.

Keywords:
Brg1Candida albicansGlcNAc sensingHyphal developmentNrg1 down-regulation

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Area of Science:

  • Mycology
  • Molecular Biology
  • Pathogenesis

Background:

  • Candida albicans is an opportunistic fungal pathogen.
  • Polymorphism (yeast, pseudohyphal, hyphal forms) is a key virulence factor.
  • Hyphal formation is crucial for adapting to host environments.

Purpose of the Study:

  • To uncover the molecular mechanism of hyphal development in Candida albicans without cell dilution.
  • To elucidate the role of N-Acetylglucosamine (GlcNAc) in inducing filamentation.
  • To identify novel drug targets for anti-virulence therapeutics.

Main Methods:

  • Investigated GlcNAc-induced filamentation in log phase C. albicans cells.
  • Analyzed the roles of Ngs1, BRG1, and NRG1 in hyphal development.
  • Examined signaling pathways independent of the cAMP-PKA pathway.

Main Results:

  • N-Acetylglucosamine (GlcNAc) stimulates hyphal formation by down-regulating NRG1, a repressor of filamentation.
  • The GlcNAc sensor Ngs1 activates BRG1 expression, which in turn represses NRG1.
  • BRG1-mediated repression of NRG1 is essential for hyphal development induced by GlcNAc, serum, or neutral pH.

Conclusions:

  • Hyphal induction in Candida albicans without dilution is primarily mediated by Brg1-dependent repression of Nrg1.
  • This pathway offers new insights into fungal adaptation and virulence.
  • Understanding this mechanism can lead to novel anti-virulence drug development.