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AID is a cytidine deaminase essential for class switch recombination and somatic hypermutation during the humoral immune response. In this issue of Immunity, Gourzi et al. (2006) show that AID also plays a critical role in innate immunity to virally induced acute pro-B cell leukemia.
Blimp-1, a transcriptional repressor, drives the terminal differentiation of B cells to plasma cells. Using DNA microarrays, we found that introduction of Blimp-1 into B cells blocked expression of a remarkably large set of genes, while a much smaller number was induced. Blimp-1 initiated this cascade of gene expression changes by directly repressing genes encoding several transcription factors, including...
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