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Deciphering unusual uncultured magnetotactic multicellular prokaryotes through genomics.

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Genomic analysis of Candidatus Magnetoglobus multicellularis revealed proteins involved in its unique multicellular structure and behavior. Cultivating this magnetotactic prokaryote confirms its entire life cycle occurs in a multicellular form, advancing studies on prokaryotic multicellular evolution.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genomics

Background:

  • Candidatus Magnetoglobus multicellularis is a prokaryote with a unique multicellular form.
  • Magnetotactic prokaryotes are typically uncultured, limiting physiological studies.

Purpose of the Study:

  • To investigate the physiology and multicellular morphogenesis of Ca. M. multicellularis using a genomic approach.
  • To establish cultivation conditions for Ca. M. multicellularis to study its complete life cycle.

Main Methods:

  • Genomic analysis via pyrosequencing.
  • Bioinformatic analysis of genes related to morphogenesis, behavior, and metabolism.
  • Enrichment culture experiments based on genomic-physiologic information.

Main Results:

  • Genomic data identified proteins potentially involved in cell adhesion and multicellular morphogenesis, with some homologous to unrelated bacteria.
  • Genes associated with chemo-, photo-, and magnetotaxis, as well as metabolic capabilities, were analyzed.
  • A specific enrichment medium supported chemoorganoheterotrophic growth, maintaining multicellular morphology and cell cycle.

Conclusions:

  • The study provides insights into the genetic basis of multicellularity in Ca. M. multicellularis.
  • The successful cultivation confirms the organism's entire life cycle is multicellular.
  • This achievement opens avenues for further research into prokaryotic multicellular evolution.