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The fungus-specific HET domain mediates programmed cell death in Podospora anserina

M Paoletti1, C Clavé

  • 1Laboratoire de Génétique Moléculaire des Champignons, UMR-5095 CNRS et Université de Bordeaux 2, IBGC, 1 rue Camille Saint-Saëns, 33077 Bordeaux Cedex, France. mathieu.paoletti@ibgc.u-bordeaux2.fr

Eukaryotic Cell
|September 18, 2007
PubMed

Insights

Fungal vegetative incompatibility involves programmed cell death triggered by specific gene interactions. The HET domain, a key protein component, directly mediates this cell death, revealing a modular structure for incompatibility systems.

Area of Science:

  • Mycology
  • Cell Biology
  • Genetics

Background:

  • Vegetative incompatibility in fungi is a programmed cell death (PCD) response upon fusion of genetically dissimilar cells.
  • This process is governed by highly polymorphic genes, often referred to as het genes.
  • Many incompatibility systems involve proteins with a conserved, fungus-specific HET domain.

Purpose of the Study:

  • To investigate the role of the HET domain in mediating fungal cell death during vegetative incompatibility.
  • To elucidate the functional relationship between the HET domain and other components of the incompatibility system, such as het-C and het-E.

Main Methods:

  • Overexpression of the isolated HET domain from the het-E gene in Podospora anserina.
  • Characterization of cell death phenotypes, including autophagy, vacuolization, septation, and lipid droplet production.
  • Analysis of genetic suppressors of HET domain-induced lethality and their relationship to known vegetative incompatibility mutations.

Main Results:

  • Overexpression of the isolated HET domain from het-E induced cell death with hallmarks of vegetative incompatibility.
  • The observed cell death involved autophagy, increased vacuolization, septation, and lipid droplet formation.
  • HET domain-induced lethality was suppressed by mutations affecting vegetative incompatibility but not by het-C inactivation.

Conclusions:

  • The HET domain is established as the direct mediator of cell death in fungal vegetative incompatibility.
  • Incompatibility systems exhibit a modular structure, with variable regions responsible for recognition and the HET domain triggering cell death.
  • This finding provides a new framework for understanding the molecular mechanisms underlying fungal cell death and recognition.

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