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Related Experiment Video

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Kinetic Visualization of Single-Cell Interspecies Bacterial Interactions
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Carbon source diversity shapes bacterial interspecies interactions.

Hiroki Ono1, Saburo Tsuru2, Chikara Furusawa2,3

  • 1Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

The ISME Journal
|October 8, 2025
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Summary

Bacterial interactions shift from synergistic to competitive as carbon source diversity increases. This finding reveals how environmental factors like nutrient availability influence bacterial community dynamics and stability.

Keywords:
bacterial communitycarbon source diversityinterspecies interactionresource competitionsynthetic community

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Area of Science:

  • Microbiology
  • Ecology
  • Systems Biology

Background:

  • Bacterial interspecies interactions (synergistic to competitive) are critical for community composition and stability.
  • Previous studies show conflicting results on the prevalence of synergistic interactions, suggesting environmental factors like carbon source diversity may play a role.

Purpose of the Study:

  • To investigate the quantitative relationship between carbon source diversity and the types of bacterial interspecies interactions.
  • To understand the mechanisms driving shifts in interaction classes under varying nutrient conditions.

Main Methods:

  • Examined 896 interspecies interactions across 28 synthetic bacterial pairs.
  • Tested interactions under 32 conditions with systematically varied carbon source diversity.
  • Analyzed shifts in interaction types (synergistic vs. competitive) in relation to environmental conditions.

Main Results:

  • Synergistic interactions were frequently observed in environments with a single carbon source.
  • Interactions predominantly shifted to competitive as carbon source diversity increased.
  • Resource competition was identified as a key driver for this shift in diverse environments.

Conclusions:

  • Carbon source diversity significantly shapes the nature of bacterial interspecies interactions.
  • Increased nutrient availability promotes competitive interactions over synergistic ones in bacterial communities.
  • Findings offer novel insights into environmental influences on bacterial community structure and function.