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Germinal center (GC) B cells cycle between the dark zone (DZ) and light zone (LZ) during antibody affinity maturation. Whether this movement is necessary for GC function has not been tested. Here we show that CXCR4-deficient GC B cells, which are restricted to the LZ, are gradually outcompeted by WT cells indicating an essential role for DZ access. Remarkably, the transition between DZ centroblast and LZ centrocyte phenotypes occurred independently of positioning. However, CXCR4-deficient cells carried fewer mutations and were overrepresented in the CD73(+) memory compartment. These findings are consistent with a model where GC B cells change from DZ to LZ phenotype according to a timed cellular program but suggest that spatial separation of DZ cells facilitates more effective rounds of mutation and selection. Finally, we identify a network of DZ CXCL12-expressing reticular cells that likely support DZ functions.

Original publication




Journal article



Publication Date





912 - 924


Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA.


Mediastinum, Germinal Center, Lymph Nodes, Peyer's Patches, B-Lymphocytes, Plasma Cells, Animals, Radiation Chimera, Mice, Orthomyxoviridae Infections, Receptors, CXCR4, Antigens, Differentiation, B-Lymphocyte, Specific Pathogen-Free Organisms, Cell Cycle, Lymphopoiesis, Cell Movement, Antibody Affinity, Immunologic Memory, Phenotype, Time Factors, Chemokine CXCL12, Clonal Selection, Antigen-Mediated