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Improved Visualization of Oral Microbial Consortia.

S T Ramirez-Puebla1, J L Mark Welch1, G G Borisy1

  • 1ADA Forsyth Institute, Cambridge, MA, USA.

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Summary
This summary is machine-generated.

This study introduces a new sectioning technique for analyzing tongue bacteria consortia. It improves visualization of oral microbiome members, offering a detailed 3D view of these complex biofilms.

Keywords:
biofilmimagingmicrobial ecologymicrobiomemicroscopyplaque biofilms

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Area of Science:

  • Microbiology
  • Biofilm research
  • Oral microbiome analysis

Background:

  • Tongue dorsum (TD) bacterial consortia are complex 3D structures.
  • Whole-mount imaging has limitations in resolving TD biofilm intricacies.
  • Understanding spatial organization is crucial for oral microbiome research.

Purpose of the Study:

  • To develop and validate a novel method for enhanced 3D spatial analysis of TD biofilms.
  • To improve the visualization and resolution of bacterial taxa within TD consortia.
  • To complement existing whole-mount techniques for a more comprehensive biofilm analysis.

Main Methods:

  • Hydrophilic plastic embedding followed by serial physical sectioning.
  • Postsectioning labeling using multiplexed fluorescent oligonucleotide probes.
  • Spectral imaging and linear unmixing for visualization.
  • Combined serial physical and optical sectioning for 3D reconstruction.

Main Results:

  • Improved single-cell resolution for previously patchy taxa like *Actinomyces*.
  • Regular visualization of core filamentous bacteria (*Leptotrichia*, Lachnospiraceae).
  • Homogenous and regular detection of *Streptococcus salivarius*, unlike heterogeneous whole-mount findings.
  • Successful 3D reconstruction of consortia over 100 µm thick.

Conclusions:

  • Hydrophilic plastic embedding and sectioning significantly enhance TD biofilm visualization.
  • This technique provides a valuable complementary approach to whole-mount analysis.
  • The method offers improved insights into the spatial complexity of the human oral microbiome.