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Assay for Adhesion and Agar Invasion in S. cerevisiae
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Assay for Adhesion and Agar Invasion in S. cerevisiae

Published on: November 8, 2006

A screen in Saccharomyces cerevisiae identified CaMCM1, an essential gene in Candida albicans crucial for

M Rottmann1, S Dieter, H Brunner

  • 1Fraunhofer IGB, Nobelstr. 12, 70569 Stuttgart, Germany.

Molecular Microbiology
|February 13, 2003
PubMed

Insights

Researchers identified CaMcm1p as a novel regulator of fungal morphogenesis in Candida albicans. This protein plays a key role in hyphal development, influencing gene expression and cell shape.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Mycology

Background:

  • Fungal morphogenesis, crucial for pathogenic yeasts like Candida albicans, is regulated by conserved molecular pathways.
  • The FLO11 gene in Saccharomyces cerevisiae is a known target for signaling pathways controlling pseudohyphal development.

Purpose of the Study:

  • To identify novel regulators of fungal development in Candida albicans using a reporter screen in Saccharomyces cerevisiae.
  • To investigate the role of the Candida homologue of MCM1 (CaMcm1p) in fungal morphogenesis.

Main Methods:

  • A genetic screen in Saccharomyces cerevisiae utilizing a FLO11::lacZ reporter system to identify Candida albicans morphogenesis regulators.
  • Analysis of CaMcm1p expression, localization, and functional impact on hyphal development and gene expression (e.g., HWP1, NRG1, TUP1).

Main Results:

  • The screen identified known components of MAPK and cAMP signaling pathways, alongside novel factors including the Candida homologue of MCM1 (CaMcm1p).
  • CaMcm1p levels are autoregulated and likely controlled by post-translational modifications, not transcriptional changes.
  • Both overexpression and repression of CaMCM1 induced hyphae formation, and repression of CaMCM1 induced hyphae-specific gene HWP1 expression, independent of known repressors NRG1 and TUP1.

Conclusions:

  • CaMcm1p is a novel and essential regulator of hyphal growth in Candida albicans.
  • CaMcm1p functions within a previously unrecognized regulatory mechanism controlling fungal morphogenesis.

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