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Insights Obtained by Culturing Saccharibacteria With Their Bacterial Hosts.

B Bor1,2, A J Collins1,2,3, P P Murugkar1,2,4

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Summary

Researchers cultivated novel oral Saccharibacteria (TM7) species, revealing their parasitic nature. These ultrasmall bacteria attach to and lyse larger Actinobacteria hosts, advancing our understanding of the oral microbiome and Candidate Phyla Radiation.

Keywords:
culture techniquegenomicshumanmicrobiotamouthparasite

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Area of Science:

  • Microbiology
  • Oral Biology
  • Genomics

Background:

  • The oral microbiome is increasingly studied for microbial functions beyond identification.
  • Saccharibacteria (TM7) are ultrasmall bacteria from Candidate Phyla Radiation, previously lacking cultivated members.
  • Understanding Saccharibacteria-host interactions is crucial but limited due to cultivation challenges.

Purpose of the Study:

  • To isolate and cultivate additional oral Saccharibacteria species in co-culture with their hosts.
  • To characterize the genomes and interactions of these newly isolated Saccharibacteria.
  • To investigate the parasitic relationship between Saccharibacteria and their oral bacterial hosts.

Main Methods:

  • Isolation of ultrasmall Saccharibacteria via filtration and co-culturing with potential hosts.
  • Generation of complete closed genomes for phylogenetic and functional analysis.
  • Microscopic techniques (phase contrast, FISH, SEM) to observe parasite-host interactions.

Main Results:

  • Successfully cultivated four oral Saccharibacteria species in stable binary co-cultures.
  • Genomic analysis revealed small genomes (<1 Mb) with limited metabolic pathways but innate defense systems.
  • Observed Saccharibacteria attachment to Actinobacteria hosts, leading to host cell death and lysis.

Conclusions:

  • The cultivation of oral Saccharibacteria significantly expands knowledge of these ultrasmall organisms.
  • Saccharibacteria exhibit a parasitic lifestyle, directly impacting host cell viability.
  • This work provides a foundation for further research into Saccharibacteria functions and host interactions.