Immunoglobulin -γ2b Transgenes Inhibit Heavy Chain Gene Rearrangement, but Cannot Promote B Cell Development

Patricia E. Roth, Lynn Doglio, Joanna T. Manz, Joo Yeun Kim, David Lo, Ursula Storb*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Transgenic mice with a γ2b transgene were produced to investigate whether γ2b can replace ¼ in the development of B lymphocytes. Transgenic γ2b is present on the surface of B cells. Young transgenic mice have a dramatic decrease in B cell numbers, however, older mice have almost normal B cell numbers. Strikingly, all γ2b-expressing B cells in the spleen also express ¼. The same is true for mice with a hybrid transgene in which the A. transmembrane and intracytoplasmic sequences replace those of γ2b (72b-, umem). The B cell defect is not due to toxicity of γ2b since crosses between γ2b transgenic and A transgenic mice have normal numbers of B cells. Presence of the γ2b transgene strongly enhances the feedback inhibition of endogenous heavy chain gene rearrangement. Light chain genes are expressed normally, and the early expression of transgenic light chains does not improve B cell maturation. When the endogenous A locus is inactivated, B cells do not develop at all in γ2b transgenic mice. The data suggest that γ2b cannot replace ¼ in promoting the developmental maturation of B cells, but that it can cause feedback inhibition ofheavy chain gene rearrangement. Thus, the signals for heavy chain feedback and B cell maturation appear to be different.

Original languageEnglish (US)
Pages (from-to)2007-2021
Number of pages15
JournalJournal of Experimental Medicine
Issue number6
StatePublished - Dec 1 1993
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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