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Microbial model communities exhibit widespread metabolic interdependencies.

Armando Pacheco-Valenciana1, Anna Tausch2, Iva Veseli3,4

  • 1Department of Ecology, Environment, and Plant Sciences, Science for Life Laboratory, Stockholm University, Stockholm, Sweden. armando.pacheco@su.se.

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|December 3, 2025
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Summary
This summary is machine-generated.

Many microbes depend on metabolic partners for survival, with smaller genomes and less biosynthetic potential indicating successful environmental adaptation. Community-based cultivation reveals widespread metabolic interdependencies and genome streamlining in microorganisms.

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Area of Science:

  • Microbiology
  • Ecology
  • Genomics

Background:

  • Microbial communities exhibit complex interactions, but biosynthetic dependencies are poorly understood.
  • Most microbial species remain uncultivated, limiting ecological insights.

Purpose of the Study:

  • To investigate metabolic interdependencies and genome streamlining in microbial communities.
  • To cultivate previously uncultivated microorganisms from the Baltic Sea.

Main Methods:

  • Utilized a dilution approach to cultivate 204 microbial model communities.
  • Generated 527 metagenome-assembled genomes (MAGs) and a catalog of 701 species-clusters.
  • Analyzed genome size, biosynthetic potential, and environmental prevalence.

Main Results:

  • 70% of recovered species were previously uncultivated.
  • Microorganisms in larger communities had smaller genomes and reduced biosynthetic capabilities.
  • Taxa within communities displayed complementary gene repertoires, indicating metabolic cooperation.
  • Metabolic interdependencies and genome streamlining are prevalent in successful environmental microbes.

Conclusions:

  • Community-based cultivation provides access to uncultivated, abundant species.
  • Metabolic cooperation is a key ecological strategy for microorganisms.
  • Genome streamlining is linked to ecological success and interdependencies.