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Updated: Sep 18, 2025

Saccharomyces cerevisiae Exponential Growth Kinetics in Batch Culture to Analyze Respiratory and Fermentative Metabolism
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Metabolically driven flows enable exponential growth in macroscopic multicellular yeast.

Nishant Narayanasamy1, Emma Bingham2,3, Tanner Fadero4

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Newly evolved yeast clusters use spontaneous fluid flows to transport nutrients, enabling exponential growth and overcoming size limitations. This biophysical mechanism supports the evolution of multicellularity before genetic adaptations arise.

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Area of Science:

  • Evolutionary biology
  • Biophysics
  • Cell biology

Background:

  • Multicellularity's success is linked to increased size, but large size presents nutrient transport challenges.
  • Existing multicellular organisms often develop specialized structures for nutrient transport.
  • Nascent multicellular clusters face biophysical constraints limiting their size and growth.

Purpose of the Study:

  • To investigate if emergent biophysical mechanisms can facilitate nutrient transport in early multicellular yeast.
  • To determine if spontaneous fluid flows can overcome diffusion limitations in multicellular clusters.
  • To explore the role of physical processes as a scaffold for multicellular evolution.

Main Methods:

  • Experimentally evolved snowflake yeast clusters were used.
  • Metabolic activity and resulting density gradients were analyzed.
  • Fluid flow dynamics within yeast clusters were measured.
  • Growth rates at different cluster sizes were quantified.

Main Results:

  • Spontaneous fluid flows arise in yeast clusters beyond a threshold size.
  • These flows are driven by metabolically generated density gradients.
  • Nutrient transport via these flows supports exponential growth at macroscopic sizes.
  • Flow speeds are comparable to those achieved by ciliary actuation.

Conclusions:

  • Emergent biophysical mechanisms, like spontaneous fluid flows, can alleviate nutrient transport constraints in early multicellularity.
  • Physical processes can act as a scaffold, enabling larger sizes and opening evolutionary pathways.
  • This mechanism supports exponential growth in yeast clusters, defying diffusion-limited predictions.
  • Such biophysical scaffolds precede and facilitate the evolution of genetically encoded multicellular adaptations.