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Áurea Simón-Soro1, Giuseppe D'Auria2, M Carmen Collado3

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This study introduces a novel method combining flow cytometry and pyrosequencing to analyze the human microbiome and its immune interactions. It characterizes bacteria recognized by IgG and IgA antibodies, offering insights into immune responses to uncultured microbes.

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Area of Science:

  • Microbiology
  • Immunology
  • Genomics

Background:

  • Antibody recognition of microorganisms is crucial for immune response.
  • Limited understanding exists for immune interactions with uncultured human microbiome bacteria.
  • A novel approach is needed to study these interactions.

Purpose of the Study:

  • To develop and apply a combined flow cytometry and pyrosequencing technique.
  • To characterize microbial composition and immune recognition in human samples.
  • To identify bacteria recognized by IgG and IgA antibodies.

Main Methods:

  • Utilized Fluorescence-Activated Cell Sorting (FACS) to separate bacteria.
  • Labeled bacterial cells with fluorescent anti-IgG or anti-IgA antibodies.
  • Employed pyrosequencing to characterize distinct bacterial populations.

Main Results:

  • Successfully applied the technique to human fecal, saliva, oral biofilm, and breast milk samples.
  • Differentiated bacterial cells based on IgG or IgA antibody coating.
  • Characterized microorganisms that evade the immune system versus those recognized by specific immunoglobulins.

Conclusions:

  • The developed technique provides powerful insights into host-microbiome-immune system interactions.
  • Application to healthy and diseased individuals can elucidate the immune response's role in infections.
  • This method aids in understanding polymicrobial diseases and immune recognition of the microbiome.