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The Oral Microbiota01:27

The Oral Microbiota

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The oral microbiome includes a complex ecosystem comprising over 700 microbial species, identified through genomic sequencing and culture-based analyses to date. This community includes a core microbiome, found universally among individuals, and a variable component influenced by environmental factors such as diet, lifestyle, and host genetics. Site-specific conditions, including oxygen gradients, pH levels, and nutrient availability, determine the spatial distribution of these microorganisms...
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Probing oral microbial functionality--expression of spxB in plaque samples.

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Area of Science:

  • Microbiology
  • Oral Health
  • Metagenomics

Background:

  • The Human Oral Microbiome Database (HOMD) contains genome sequences of oral bacteria, representing microbial potential.
  • Connecting metagenomic potential to in vivo oral biofilm function is a significant challenge.
  • The spxB gene, encoding pyruvate oxidase, produces growth-inhibiting hydrogen peroxide (H2O2) and is crucial for interspecies competition.

Purpose of the Study:

  • To investigate the functional role of the conserved spxB gene in the oral biofilm.
  • To correlate the presence of spxB with hydrogen peroxide production in dental plaque.
  • To demonstrate in vivo expression of a metagenomically identified oral gene.

Main Methods:

  • Utilized HOMD data to identify conserved genes in oral streptococci.
  • Correlated spxB gene presence with hydrogen peroxide production in dental plaque.
  • Employed Real-Time RT PCR to analyze spxB gene expression in human plaque samples.

Main Results:

  • Identified spxB as a conserved metabolic gene in a majority of oral streptococci.
  • Demonstrated a strong correlation between H2O2 production and spxB gene presence in dental plaque.
  • Confirmed in vivo expression of spxB in freshly isolated human plaque samples.

Conclusions:

  • The spxB gene is expressed in vivo, suggesting a functional role in oral biofilm physiology.
  • This study provides the first demonstration of an oral community gene expressed in vivo.
  • Identifies a strategy for linking metagenomic potential to functional roles in oral microbial communities.