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Related Experiment Videos

Ubiquitin gene expression: response to environmental changes.

J Fraser1, H A Luu, J Neculcea

  • 1Department of Biology, Concordia University, Montreal, Quebec, Canada.

Current Genetics
|July 1, 1991
PubMed
Summary
This summary is machine-generated.

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Yeast ubiquitin gene UBI4 is induced by environmental stress, returning to normal levels after adaptation. Genes UBI1, 2, and 3 require active cell growth for high expression and are repressed by stress.

Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Cellular Stress Response

Background:

  • Differential expression of yeast ubiquitin genes (UBI1-3 vs. UBI4) observed during log-phase growth.
  • UBI1, 2, and 3 are highly expressed during active growth.
  • UBI4 is weakly expressed during normal growth conditions.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling yeast ubiquitin gene expression under various stress conditions.
  • To determine the role of UBI4 in response to cellular stress and metabolic shifts.
  • To elucidate the relationship between cell growth and the expression of UBI1, 2, and 3 genes.

Main Methods:

  • Yeast batch cultures were subjected to various stress treatments: heat shock, DNA-damaging agents, starvation, and refeeding of starved cells.

Related Experiment Videos

  • Quantitative analysis of UBI1, UBI2, UBI3, and UBI4 gene expression levels under different conditions.

    • Main Results:

    • UBI4 expression was transiently induced by heat shock, DNA damage, starvation, and refeeding, suggesting its role in metabolic adaptation.
    • UBI1, 2, and 3 genes were transiently repressed by most treatments, except starvation, which caused a prolonged repression.
    • High expression of UBI1, 2, and 3 is dependent on active cell growth; conditions slowing or stopping growth repress these genes.

    Conclusions:

    • UBI4 acts as a stress-responsive gene, induced during significant metabolic changes and returning to basal levels upon adaptation.
    • UBI1, 2, and 3 expression is tightly linked to cell growth, indicating their role in maintaining cellular functions during active proliferation.
    • Differential regulation of ubiquitin genes reflects distinct roles in cellular homeostasis and stress response pathways in yeast.