Positive selection from newly formed to marginal zone B cells depends on the rate of clonal production, CD19, and btk

Academic Article


  • Using immunoglobulin heavy chain transgenic mice, we show that B cell clones reaching the long-lived pool are heterogeneous: some are enriched in the CD21(high) compartment (mostly marginal zone [MZ]), others reside primarily in the follicles (FO). Altering the composition of the B cell receptor through N region additions decreases the rate of clonal production and the MZ enrichment. This process can be recapitulated by purified CD21(low) B cells and is due to a preferential clonal survival that requires a functional btk tyrosine kinase. We also show that generation of the MZ population is dependent on CD19. These findings suggest that the MZ B cell repertoire is positively selected and have functional implications for antigenic responses effected by B cells from this microenvironment.
  • Published In

  • Immunity  Journal
  • Digital Object Identifier (doi)

    Author List

  • Martin F; Kearney JF
  • Start Page

  • 39
  • End Page

  • 49
  • Volume

  • 12
  • Issue

  • 1