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Microbial symbionts regulate the primary Ig repertoire.

Yuezhou Chen1, Neha Chaudhary1, Nicole Yang1

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Symbiotic microbes shape the immune system by enriching antibacterial specificities in B cells. This influences both gut and systemic immunity, enhancing responses to pathogens.

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Area of Science:

  • Immunology
  • Microbiology
  • Microbiome research

Background:

  • Immunoglobulin (Ig) recognition of pathogens is vital for immune function.
  • The development of the preimmune Ig repertoire, particularly B cell receptors (BCRs), is not fully understood.
  • Early life microbial exposures are hypothesized to influence the developing immune system.

Purpose of the Study:

  • To investigate the role of symbiotic microbes in shaping the preimmune Ig repertoire.
  • To determine if microbial exposure affects the frequency and specificity of B cells.

Main Methods:

  • Comparison of germ-free mice with conventionally colonized littermates.
  • Ig-binding assays to quantify B cell reactivity.
  • Analysis of B cell populations in lymphoid tissues (intestine and spleen).

Main Results:

  • Exposure to conventional microbes enriched antibacterial IgM+ IgD+ B cells in the intestine and spleen.
  • This enrichment involved diverse Ig-variable region genes and was T cell-independent.
  • Microbe-reactive B cells enhanced IgA production in the gut and boosted IgG responses to bacterial immunization.

Conclusions:

  • Microbial symbionts play a crucial role in shaping the host's preimmune B cell repertoire.
  • Enrichment of antibacterial specificities by microbes has functional consequences for mucosal and systemic immunity.
  • This highlights a key mechanism by which the microbiome influences host immune fitness.