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Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
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Oxygen suppression of macroscopic multicellularity.

G Ozan Bozdag1, Eric Libby2,3,4, Rozenn Pineau5,6

  • 1School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA. ozan.bozdag@gmail.com.

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Area of Science:

  • Evolutionary Biology
  • Biophysics
  • Biochemistry

Background:

  • Atmospheric oxygen is traditionally linked to the evolution of complex multicellular life.
  • The precise role of oxygen levels in early multicellular evolution remains debated.

Purpose of the Study:

  • To investigate how varying oxygen concentrations affect the evolution of multicellular size.
  • To challenge the assumption that increased oxygen universally promotes multicellularity.

Main Methods:

  • Selection experiments using multicellular 'snowflake' yeast across a gradient of oxygen levels.
  • Genomic sequencing and synthetic strain construction to identify genetic underpinnings.
  • Mathematical modeling to explore evolutionary and biophysical trade-offs.

Main Results:

  • Intermediate oxygen levels, not high oxygen, constrained the evolution of large multicellular size in yeast.
  • Both anaerobic and high-oxygen conditions favored the evolution of larger yeast size.
  • Oxygen-mediated divergent selection on organism size was confirmed as the underlying mechanism.

Conclusions:

  • Oxygen acts as a double-edged sword, with selection for its efficient use potentially suppressing macroscopic multicellularity.
  • Evolutionary and biophysical trade-offs, influenced by oxygen, likely govern the evolution of multicellular size.
  • The study challenges prevailing theories on oxygen's role in the evolution of complex life.