Ligand-independent signaling during early avian B cell development |
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Authors: | Pike Kelly A. Ratcliffe Michael J. H. |
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Affiliation: | (1) Department of Immunology, University of Toronto, 1 King's College Circle, M5S 1A8 Toronto, Ontario, Canada;(2) Sunnybrook and Women's College Health Sciences Center, 2075 Bayview Avenue, M4N 3M5 Toronto, Ontario, Canada |
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Abstract: | Surface immunoglobulin (sIg) expression has been conserved as a critical checkpoint in B lymphocyte development. In the chicken embryo, only sIg+ B cells are selectively expanded in the bursa of Fabricius, a primary lymphoid organ unique to the avian species. We have previously demonstrated that an interaction between the antigen-binding sites of sIg and a specific bursal ligand(s) is not required to regulate this developmental checkpoint. Rather, the requirement for sIg expression can be attributed to the surface expression of the Igα/β heterodimer associated with sIg. More specifically, ligand-independent signaling downstream of the Igα cytoplasmic domain drives all bursal stages of B cell development during embryogenesis. We discuss here a site-directed mutagenesis approach to identify the critical membrane proximal events involved in ligand-independent signaling during B cell development. |
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Keywords: | B cell development Bursa of Fabricius BCR complex Signal transduction Ig-alpha Ig-beta ITAM |
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