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Pearling drives mitochondrial DNA nucleoid distribution.

Juan C Landoni1, Matthew D Lycas1, Josefa Macuada1,2

  • 1Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

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Summary
This summary is machine-generated.

Mitochondria undergo reversible "pearling," a process that precisely spaces mitochondrial DNA nucleoids. This biophysical mechanism, triggered by calcium, ensures proper mitochondrial function and genome inheritance.

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Biophysics

Background:

  • Mitochondrial DNA (mtDNA) nucleoid distribution is critical for mitochondrial function and inheritance.
  • Existing knowledge lacks mechanisms explaining mtDNA nucleoid segregation and precise positioning within mitochondria.

Purpose of the Study:

  • To investigate the mechanisms governing mitochondrial nucleoid distribution and positioning.
  • To identify the biophysical processes regulating internucleoid spacing and mitochondrial genome inheritance.

Main Methods:

  • Observation of mitochondrial morphology changes, specifically a reversible transformation termed 'pearling'.
  • Analysis of the relationship between pearling, calcium influx, and mitochondrial inner membrane cristae.
  • Assessment of nucleoid disaggregation and internucleoid distancing during pearling.

Main Results:

  • Mitochondria exhibit a reversible 'pearling' instability, changing from tubular to a beads-on-a-string morphology.
  • Pearling establishes precise internucleoid distances and mediates nucleoid disaggregation.
  • Calcium influx triggers pearling; cristae density influences pearling and preserves nucleoid spacing.

Conclusions:

  • Pearling is identified as a novel biophysical mechanism controlling mtDNA nucleoid distribution and inheritance.
  • Mitochondrial calcium regulation and cristae integrity are crucial for proper nucleoid spacing.
  • Dysregulation of these factors leads to aberrant nucleoid clustering, impacting mitochondrial function.