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A transient decrease of electrochemical gradient stabilizes DNA structural change in single mitochondria of living

C Durieux1, A C Brunet, V Geeraert

  • 1Département de Recherche, Institut Curie, Paris, France.

Biology of the Cell
|January 12, 2000
PubMed
Summary
This summary is machine-generated.

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Perturbing the mitochondrial electrochemical gradient alters mitochondrial DNA structure. This DNA change is reversible after a full gradient collapse but stabilizes with weak, short perturbations.

Area of Science:

  • Mitochondrial biology
  • Molecular cell biology
  • Biophysics

Background:

  • Mitochondria generate an electrochemical gradient essential for cellular energy production.
  • Mitochondrial DNA (mtDNA) integrity is crucial for mitochondrial function and cellular health.
  • Understanding how environmental factors affect mtDNA structure is vital for cell biology.

Purpose of the Study:

  • To investigate the impact of controlled electrochemical gradient perturbations on mitochondrial DNA structure in living cells.
  • To determine the reversibility and stability of mtDNA structural changes in response to varying gradient perturbations.

Main Methods:

  • Utilized fluorescence microscopy to observe living cells.
  • Induced electrochemical gradient perturbations using carbonyl cyanide p-trifluoromethoxyphenylhydrazone.

Related Experiment Videos

  • Quantified mitochondrial membrane potential with tetramethyl rhodamine methyl ester.
  • Monitored changes in ethidium fluorescence, indicative of mtDNA structural alterations.

    • Main Results:

    • Electrochemical gradient perturbations were shown to induce structural changes in mitochondrial DNA.
    • These mtDNA structural changes were readily reversible upon a complete, short-term collapse of the electrochemical gradient.
    • Conversely, brief and minor perturbations of the electrochemical gradient led to stabilization of the mtDNA structure.
    • Observed significant cell-to-cell variability in the response to weak depolarization.

    Conclusions:

    • The study demonstrates a direct link between mitochondrial electrochemical gradient status and mtDNA structural dynamics.
    • Mitochondrial DNA exhibits distinct structural responses (change vs. stabilization) depending on the nature and duration of electrochemical gradient perturbations.
    • The cell-specific variability in response highlights the importance of single-cell analysis for understanding mitochondrial energetic perturbations.