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Clonal structure, stability and dynamics of human memory B cells and circulating plasmablasts.

Ganesh E Phad1, Dora Pinto2, Mathilde Foglierini2

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Human memory B cells are long-lived and crucial for immunity. This study reveals their stable structure and dynamic role in generating antibody-producing cells, suggesting continuous immune activity.

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Area of Science:

  • Immunology
  • Cell Biology
  • Human Genetics

Background:

  • Memory B cells are essential for long-term immunity, rapidly responding to re-exposure to pathogens.
  • The clonal relationships and evolutionary dynamics between memory B cells and circulating plasmablasts remain incompletely understood.

Purpose of the Study:

  • To systematically describe the structure, stability, and dynamics of the human memory B cell pool.
  • To investigate the clonal relationship and evolution of memory B cells and plasmablasts.

Main Methods:

  • Utilized single-cell sequencing techniques.
  • Employed isolation of specific antibodies.
  • Analyzed multiyear samples from healthy donors.

Main Results:

  • The memory B cell repertoire was characterized by large IgM, IgA, and IgG2 clonal families, with smaller IgG1 families.
  • Demonstrated stability of memory B cell clonal families over multiple years.
  • Identified a significant fraction of plasmablasts originating from long-term memory B cell families, with recurrent presence.

Conclusions:

  • Memory B cells exhibit a stable structure but are dynamically involved in plasmablast generation.
  • Suggests that memory B cells are actively involved in producing plasmablasts at all times.
  • Provides a comprehensive understanding of the human memory B cell pool's organization and function.