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Neurospora crassa a mating-type region.

C Staben1, C Yanofsky

  • 1Department of Biological Sciences, Stanford University, CA 94305-5020.

Proceedings of the National Academy of Sciences of the United States of America
|July 1, 1990
PubMed
Summary

The mating-type region in Neurospora crassa, specifically the

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Area of Science:

  • Mycology
  • Genetics
  • Molecular Biology

Background:

  • The mating-type (MAT) region governs sexual and asexual reproduction in fungi.
  • In Neurospora crassa, the 'a' MAT region is distinct from the 'A' MAT region.
  • Understanding the 'a' MAT region's function is crucial for fungal life cycle research.

Purpose of the Study:

  • To elucidate the functional organization of the 'a' mating-type region in Neurospora crassa.
  • To identify the specific roles of the mt a-1 polypeptide in fungal development and reproduction.
  • To investigate the evolutionary conservation of mating-related genes.

Main Methods:

  • DNA sequence analysis of the 'a' mating-type region.
  • Identification and characterization of functional segments and transcripts.
  • Mutational analysis of the mt a-1 gene and polypeptide.
  • Comparative sequence analysis with related fungal species.

Main Results:

  • The 'a' MAT region is 3235 base pairs and contains at least two functional segments.
  • A key segment encodes the mt a-1 polypeptide, essential for vegetative incompatibility, mating identity, and perithecium induction.
  • The mt a-1 polypeptide shows homology to Schizosaccharomyces pombe mat-Mc, suggesting conserved mating functions.
  • Distinct domains of the mt a-1 polypeptide are responsible for mating and vegetative incompatibility.

Conclusions:

  • The 'a' mating-type region of Neurospora crassa contains essential genes for sexual and asexual development.
  • The mt a-1 polypeptide plays a central role in regulating key life cycle events.
  • Functional and structural similarities highlight conserved mechanisms in fungal mating systems.

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