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Aspergillus nidulans hypA regulates morphogenesis through the secretion pathway

Xianzong Shi1, Yu Sha, Susan Kaminskyj

  • 1Department of Biology, University of Saskatchewan, SK, S7N 5E2 Saskatoon, Canada.

Fungal Genetics and Biology : FG & B
|December 4, 2003
PubMed

Insights

The Aspergillus nidulans hypA gene is crucial for hyphal growth and cell wall integrity. Mutations in hypA lead to altered cell morphology and reduced enzyme secretion, particularly at higher temperatures.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Mycology

Background:

  • The Aspergillus nidulans hypA gene encodes a large cytoplasmic peptide.
  • Specific alleles (hypA1, hypA6) cause distinct morphological changes at elevated temperatures.

Purpose of the Study:

  • To investigate the function of Aspergillus nidulans hypA.
  • To characterize the cellular defects associated with hypA mutations.

Main Methods:

  • Genetic analysis of hypA alleles and deletion strains.
  • Microscopic examination of hyphal morphology and cell wall structure.
  • Assessment of enzyme secretion and cytoskeletal organization.

Main Results:

  • hypA mutants exhibit wide, slow-growing hyphae with thick walls at 42°C.
  • hypA deletion strains require osmotic support and show aberrant morphology.
  • Enzyme secretion is reduced in hypA1 cells at 42°C, with impaired endomembrane and actin polarity, and reduced microtubules.

Conclusions:

  • The hypA gene product is essential for maintaining normal hyphal growth, cell wall integrity, and secretion pathways in Aspergillus nidulans.
  • hypA orthologs, like Saccharomyces cerevisiae TRS120, suggest a conserved role in intracellular trafficking and cellular organization.

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