Aberrant B Cell Development and Immune Response in Mice with a Compromised BCR Complex

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Science  21 Jun 1996:
Vol. 272, Issue 5269, pp. 1804-1808
DOI: 10.1126/science.272.5269.1804


The immunoglobulin α (Ig-α)-Ig-β heterodimer is the signaling component of the antigen receptor complex on B cells (BCR) and B cell progenitors (pre-BCR). A mouse mutant that lacks most of the Ig-α cytoplasmic tail exhibits only a small impairment in early B cell development but a severe block in the generation of the peripheral B cell pool, revealing a checkpoint in B cell maturation that ensures the expression of a functional BCR on mature B cells. B cells that do develop demonstrate a differential dependence on Ig-α signaling in antibody responses such that a signaling-competent Ig-α appears to be critical for the response to T independent, but not T dependent, antigens.

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