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Asexual sporulation in Aspergillus nidulans

T H Adams1, J K Wieser, J H Yu

  • 1Department of Biology, Texas A&M University, College Station 77843, USA. tom@bio.tamu.edu

Microbiology and Molecular Biology Reviews : MMBR
|April 8, 1998
PubMed
Summary

Filamentous fungi like Aspergillus reproduce via conidia. Two signaling pathways in Aspergillus nidulans control conidiophore development, balancing growth and asexual sporulation.

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Area of Science:

  • Mycology
  • Molecular Biology
  • Developmental Biology

Background:

  • Filamentous fungi, particularly Ascomycetes, commonly reproduce using mitotically derived spores called conidia.
  • Conidiophore formation in Aspergillus nidulans is a key model for studying fungal asexual sporulation mechanisms.
  • Conidiophore development can be triggered by intrinsic developmental cues or environmental stresses like nutrient deprivation.

Purpose of the Study:

  • To elucidate the molecular mechanisms controlling asexual sporulation in filamentous fungi.
  • To identify key genes and signaling pathways involved in conidiophore development.
  • To present a working model for the regulatory interactions governing fungal growth and development.

Main Methods:

  • Analysis of transcription factors regulating conidiophore development.
  • Identification of genes involved in conidiophore morphogenesis.
  • Investigation of signaling pathways controlling sporulation.

Main Results:

  • Identified early-acting genes essential for initiating conidiophore development.
  • Discovered at least two antagonistic signaling pathways regulating sporulation.
  • Characterized a G protein-modulated pathway that stimulates growth and represses sporulation.
  • Identified a second pathway involving an extracellular signal that induces sporulation and removes developmental repression.

Conclusions:

  • A model is proposed where antagonistic signaling pathways regulate the balance between fungal growth and development.
  • Understanding these pathways provides insight into the control of asexual reproduction in filamentous fungi.
  • This research advances the understanding of Aspergillus nidulans as a model for fungal sporulation.

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