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Related Experiment Videos

[Cryptic heterokaryons in Saccharomyces cerevisiae strains. Model experiments].

O V Nevzgliadova1, S G Davydenko, T I Smirnova

  • 1Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia.

Genetika
|April 17, 1999
PubMed
Summary

Researchers created yeast heterokaryons that segregate different phenotypes. These yeast strains can express traits from one parent

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Area of Science:

  • Genetics and Molecular Biology
  • Yeast Genetics
  • Cell Biology

Background:

  • Heterokaryons in Saccharomyces cerevisiae can be unstable.
  • Understanding nuclear and mitochondrial genome interactions is crucial for yeast genetics.
  • Phenotypic expression can be influenced by both nuclear and cytoplasmic factors.

Purpose of the Study:

  • To investigate the segregation of phenotypic traits in yeast heterokaryons.
  • To identify and characterize phenotypically silent nuclei within yeast cells.
  • To develop methods for detecting cryptic nuclei in Saccharomyces cerevisiae.

Main Methods:

  • Construction of yeast heterokaryons.
  • Phenotypic analysis of segregated clones.
  • Culturing of "cytoductants" on selective media.

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  • Blot hybridization using URA3 gene insertion and 2-micron DNA.

    • Main Results:

    • Obtained heterokaryons capable of segregating clones with different phenotypes.
    • Identified clones with nuclear traits from one parent and mitochondrial traits from another.
    • Demonstrated that these clones contained a phenotypically silent nucleus.
    • Successfully uncovered the cryptic nucleus in "cytoductants" by specific medium cultivation.
    • Utilized blot hybridization to detect the cryptic nucleus.

    Conclusions:

    • Yeast heterokaryons can harbor and segregate phenotypically silent nuclei.
    • The cryptic nucleus can be reactivated or detected under specific conditions.
    • Molecular tools like blot hybridization are effective for identifying hidden genetic material in yeast.