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Self-fructification associated with genetic instability in Coprinus radiatus.

O Ozier-Kalogeropoulos1, E Guillemet

  • 1Centre de Génétique Moléculaire du C.N.R.S., Université Pierre et Marie Curie, Gif-sur-Yvette, France.

Mutation Research
|June 1, 1989
PubMed
Summary

Self-fructification in Coprinus radiatus mushrooms resulted from genetic instability and mutations. These findings reveal parallels with dysgenesis phenomena observed in other organisms.

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Area of Science:

  • Mycology
  • Genetics
  • Developmental Biology

Background:

  • Basidiomycete fungi like Coprinus radiatus exhibit complex life cycles.
  • Self-fructification, or the ability to produce fruiting bodies under specific conditions, is a key developmental process.
  • Understanding the genetic basis of self-fructification is crucial for fungal biology.

Purpose of the Study:

  • To investigate the genetic mechanisms underlying high-frequency self-fructification in Coprinus radiatus progeny.
  • To identify the genetic factors and mutations responsible for aberrant developmental pathways.
  • To compare observed phenomena with known genetic instability syndromes in other species.

Main Methods:

  • Controlled crosses of Coprinus radiatus strains.
  • Analysis of progeny for self-fructification phenotypes.

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  • Genetic mapping and characterization of mutations, including those linked to the B1 incompatibility factor and the Nic-2 locus.

    • Main Results:

    • Two types of self-fructifying progeny were observed at high frequency.
    • Monokaryotic fruiting resulted from mutations affecting the B1 incompatibility factor.
    • Self-fructification also occurred due to the presence of both parental genomes within a single spore.
    • These phenomena were linked to genetic instability at the Nic-2 locus and high mutability.

    Conclusions:

    • Genetic instability, high mutability, and abnormal life cycle development drive self-fructification in Coprinus radiatus.
    • The observed traits share similarities with hybrid dysgenesis in Drosophila and meiotic dysgenesis in Phycomyces.
    • These findings highlight conserved mechanisms of genetic instability across different eukaryotic organisms.