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Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
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A conserved bacterial genetic basis for commensal-host specificity.

Karina Gutiérrez-García1, Kevin Aumiller1,2, Ren Dodge1

  • 1Biosphere Sciences and Engineering Division, Carnegie Institution for Science, Baltimore, MD, USA.

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Lactiplantibacillus plantarum uses specific adhesins to attach to the fruit fly gut, establishing a stable symbiotic relationship. This host-specific recognition is key for bacterial colonization and survival in the Drosophila melanogaster gut niche.

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Area of Science:

  • Microbiology
  • Insect Biology
  • Symbiotic Relationships

Background:

  • Animals acquire gut bacteria that enhance host fitness.
  • Bacterial symbionts must locate and grow within specific gut niches for colonization.
  • Adhesins mediate bacterial attachment, but often require additional mechanisms for sustained infection.

Purpose of the Study:

  • To investigate how Lactiplantibacillus plantarum colonizes the Drosophila melanogaster gut.
  • To identify the mechanisms Lactiplantibacillus plantarum uses for niche recognition and stable establishment.

Main Methods:

  • Live imaging of individual symbiotic bacterial cells in the gut of living Drosophila melanogaster.
  • Analysis of bacterial adhesins and genetic elements involved in colonization.

Main Results:

  • Lactiplantibacillus plantarum specifically recognizes the fruit fly foregut as a distinct physical niche.
  • Host-specific adhesins, encoded by a colonization island, enable stable establishment of L. plantarum.
  • The adhesin binding domains and secretion system on the island are conserved across related bacteria.

Conclusions:

  • Lactiplantibacillus plantarum utilizes host-specific adhesins for targeted colonization of the Drosophila melanogaster foregut.
  • A conserved colonization island facilitates stable symbiotic bacterial establishment in insect guts.
  • This study reveals specific molecular mechanisms underlying host-microbe interactions in a model organism.