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Published on: October 6, 2019
Graded expression of interferon regulatory factor-4 coordinates isotype switching with plasma cell differentiation
Roger Sciammas1, A L Shaffer, Jonathan H Schatz
1Howard Hughes Medical Institute, Department of Molecular Genetics and Cell Biology, The University of Chicago, Chicago, Illinois 60637, USA.
Abstract:
Molecular mechanisms underlying the coordination of isotype switching with plasma cell differentiation are poorly understood. We show that interferon regulatory factor-4 (IRF-4) regulates both processes by controlling the expression of the Aicda and Prdm1 genes, which encode AID and Blimp-1, respectively. Genome-wide analysis demonstrated that Irf4(-/-) B cells failed to induce the entire Blimp-1-dependent plasma cell program. Restoration of AID or Blimp-1 expression in Irf4(-/-) B cells promoted isotype switching or secretion, respectively. IRF-4 was expressed in a graded manner in differentiating B cells and targeted Prdm1. Higher concentration of IRF-4 induced Prdm1 and consequently the transition from a germinal center gene expression program to that of a plasma cell. We propose a gene-regulatory network in which graded expression of IRF-4 developmentally coordinates isotype switching with plasma cell differentiation.
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