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Related Experiment Videos

A path from mitochondria to the yeast nucleus.

R A Butow1, R Docherty, V S Parikh

  • 1Department of Biochemistry, University of Texas, Dallas 75235.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|May 31, 1988
PubMed
Summary

Researchers found a pathway in yeast regulating mitochondrial biogenesis. Nuclear DNA expression increases when mitochondrial DNA is defective, suggesting a cellular control system for mitochondria.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Mitochondrial biogenesis is crucial for cellular energy production.
  • The interplay between mitochondrial and nuclear genomes is complex.
  • Yeast serves as a model organism for studying fundamental cellular processes.

Purpose of the Study:

  • To identify a communication pathway between mitochondria and the nucleus in yeast.
  • To investigate the regulatory mechanisms of mitochondrial biogenesis.
  • To explore the cellular response to mitochondrial genome defects.

Main Methods:

  • Analysis of nuclear DNA sequence expression in yeast strains with mitochondrial defects (rho 0 petites).
  • Identification and characterization of specific nuclear transcripts.

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  • Investigating the abundance of poly(A)+ transcripts in relation to mitochondrial DNA presence.

    • Main Results:

    • A pathway from mitochondria to the nucleus was identified, influencing nuclear DNA expression.
    • Specific nuclear DNA sequences are upregulated in response to mitochondrial genome defects, including the absence of mitochondrial DNA.
    • Stable poly(A)+ transcripts from the nuclear ribosomal DNA non-transcribed spacer region are abundant in rho 0 petite yeast cells.

    Conclusions:

    • The findings suggest a mitochondrial homeostatic control system in yeast.
    • This system may regulate the mass of mitochondria and mitochondrial DNA.
    • The pathway could adjust organelle content in response to cellular needs during cell division.