IgA class switch in I alpha exon-deficient mice. Role of germline transcription in class switch recombination.

GR Harriman, A Bradley, S Das… - The Journal of …, 1996 - Am Soc Clin Investig
GR Harriman, A Bradley, S Das, P Rogers-Fani, AC Davis
The Journal of clinical investigation, 1996Am Soc Clin Investig
Studies have implicated defective Ig class switch in the pathogenesis of IgA deficiency. To
understand better the molecular events that regulate IgA class switch, a 1.4-kb region of the
IgA locus containing the I alpha exon was replaced with a human hypoxanthine
phosphoribosyltransferase minigene by gene targeting in murine embryonic stem cells. The
I alpha exon-deficient mice derived from these embryonic stem cells had normal IgA levels
in serum and secretions and normal numbers of IgA B cells in Peyer's patches and spleen …
Studies have implicated defective Ig class switch in the pathogenesis of IgA deficiency. To understand better the molecular events that regulate IgA class switch, a 1.4-kb region of the IgA locus containing the I alpha exon was replaced with a human hypoxanthine phosphoribosyltransferase minigene by gene targeting in murine embryonic stem cells. The I alpha exon-deficient mice derived from these embryonic stem cells had normal IgA levels in serum and secretions and normal numbers of IgA B cells in Peyer's patches and spleen. Further, I alpha exon-deficient B cells efficiently underwent IgA class switch in vitro, despite the absence of I alpha exon-containing germline transcripts. Notably, I alpha exon-deficient B cells did not require TGF-beta for IgA class switch since stimulation with LPS alone led to IgA expression. Nonetheless, whereas I alpha exon-deficient B cells constitutively expressed human hypoxanthine phosphoribosyltransferase transcripts, they did not produce IgA in the absence of LPS stimulation. These results demonstrate that the I alpha exon or transcripts containing the I alpha exon are not required for IgA class switch. Further, the effects of TGF-beta on I alpha locus transcription can be supplanted by expression of a heterologous minigene at that locus, but a second signal is required for the induction of IgA class switch.
The Journal of Clinical Investigation