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Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast
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Mitochondrial network size scaling in budding yeast.

Susanne M Rafelski1, Matheus P Viana, Yi Zhang

  • 1Department of Biochemistry and Biophysics, University of California-San Francisco (UCSF), San Francisco, CA, USA. susanner@uci.edu

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Summary

Mitochondria grow with yeast cells, primarily in the bud, maintaining a stable size ratio across generations. This ensures consistent inheritance despite asymmetric mitochondrial distribution from aging mothers.

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Area of Science:

  • Cell Biology
  • Mitochondrial Dynamics
  • Budding Yeast Models

Background:

  • Mitochondria are vital organelles that must scale with cell growth for proper function and inheritance.
  • Maintaining mitochondrial content is crucial for cellular physiology and ensuring daughter cells receive adequate mitochondria.

Purpose of the Study:

  • To investigate the relationship between mitochondrial network size and cell size in budding yeast.
  • To understand how mitochondrial content scales with cell size during cell division and aging.

Main Methods:

  • Quantitative analysis of mitochondrial network size in budding yeast.
  • Measurement of mitochondria-to-cell size ratios across generations.
  • Tracking mitochondrial inheritance patterns in aging mother cells and their buds.

Main Results:

  • Mitochondrial network size positively correlates with cell size, with scaling predominantly occurring in the bud.
  • The mitochondria-to-cell size ratio decreases in aging mother cells over successive generations.
  • Buds consistently achieve a similar average mitochondria-to-cell size ratio, irrespective of maternal age or mitochondrial content.

Conclusions:

  • Budding yeast establishes a stable scaling relationship between mitochondrial content and cell size.
  • Asymmetric mitochondrial inheritance in aging mothers is compensated to ensure consistent organelle content in daughter cells.
  • This regulatory mechanism ensures robust cellular physiology and inheritance in yeast populations.