Preferential expansion of cross-reactive pre-existing switched memory B cells that recognize the SARS-CoV-2 Omicron variant Spike protein
Perugino, C. A.; Liu, H.; Feldman, J.; Hauser, B. M.; Jacob-Dolan, C.; Nathan, A.; Zhou, Z.; Kaseke, C.; Tano-Menka, R.; Getz, M. A.; Sanjobe, F.; Berrios, C.; Ofoman, O.; Lemieux, J.; Goldberg, M. B. A.; Nundel, K.; Marshak-Rothstein, A.; Iafrate, J.; Gaiha, G.; Charles, R.; Balazs, A. B.; Naranbhai, V.; Schmidt, A. G.; Pillai, S.
Show abstract
In previously unvaccinated and uninfected individuals, non-RBD SARS-CoV-2 spike-specific B cells were prominent in two distinct, durable, resting, cross-reactive, "pre-existing" switched memory B cell compartments. While pre-existing RBD-specific B cells were extremely rare in uninfected and unvaccinated individuals, these two pre-existing switched memory B cell compartments were molded by vaccination and infection to become the primary source of RBD-specific B cells that are triggered by vaccine boosting. The frequency of wild-type RBD-binding memory B cells that cross-react with the Omicron variant RBD did not alter with boosting. In contrast, after a boost, B cells recognizing the full-length Omicron variant spike protein expanded, with pre-existing resting memory B cells differentiating almost quantitatively into effector B cell populations. B cells derived from "ancient" pre-existing memory cells and that recognize the full-length wild-type spike with the highest avidity after boosting are the B cells that also bind the Omicron variant spike protein. O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=141 SRC="FIGDIR/small/21268554v1_ufig1.gif" ALT="Figure 1"> View larger version (32K): org.highwire.dtl.DTLVardef@1de97acorg.highwire.dtl.DTLVardef@b7ab7forg.highwire.dtl.DTLVardef@5c38dcorg.highwire.dtl.DTLVardef@99106c_HPS_FORMAT_FIGEXP M_FIG C_FIG
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