iScience (Jan 2023)

Maturation of SARS-CoV-2 Spike-specific memory B cells drives resilience to viral escape

  • Roberta Marzi,
  • Jessica Bassi,
  • Chiara Silacci-Fregni,
  • Istvan Bartha,
  • Francesco Muoio,
  • Katja Culap,
  • Nicole Sprugasci,
  • Gloria Lombardo,
  • Christian Saliba,
  • Elisabetta Cameroni,
  • Antonino Cassotta,
  • Jun Siong Low,
  • Alexandra C. Walls,
  • Matthew McCallum,
  • M. Alejandra Tortorici,
  • John E. Bowen,
  • Exequiel A. Dellota, Jr.,
  • Josh R. Dillen,
  • Nadine Czudnochowski,
  • Laura Pertusini,
  • Tatiana Terrot,
  • Valentino Lepori,
  • Maciej Tarkowski,
  • Agostino Riva,
  • Maira Biggiogero,
  • Alessandra Franzetti-Pellanda,
  • Christian Garzoni,
  • Paolo Ferrari,
  • Alessandro Ceschi,
  • Olivier Giannini,
  • Colin Havenar-Daughton,
  • Amalio Telenti,
  • Ann Arvin,
  • Herbert W. Virgin,
  • Federica Sallusto,
  • David Veesler,
  • Antonio Lanzavecchia,
  • Davide Corti,
  • Luca Piccoli

Journal volume & issue
Vol. 26, no. 1
p. 105726

Abstract

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Summary: Memory B cells (MBCs) generate rapid antibody responses upon secondary encounter with a pathogen. Here, we investigated the kinetics, avidity, and cross-reactivity of serum antibodies and MBCs in 155 SARS-CoV-2 infected and vaccinated individuals over a 16-month time frame. SARS-CoV-2-specific MBCs and serum antibodies reached steady-state titers with comparable kinetics in infected and vaccinated individuals. Whereas MBCs of infected individuals targeted both prefusion and postfusion Spike (S), most vaccine-elicited MBCs were specific for prefusion S, consistent with the use of prefusion-stabilized S in mRNA vaccines. Furthermore, a large fraction of MBCs recognizing postfusion S cross-reacted with human betacoronaviruses. The avidity of MBC-derived and serum antibodies increased over time resulting in enhanced resilience to viral escape by SARS-CoV-2 variants, including Omicron BA.1 and BA.2 sublineages, albeit only partially for BA.4 and BA.5 sublineages. Overall, the maturation of high-affinity and broadly reactive MBCs provides the basis for effective recall responses to future SARS-CoV-2 variants.

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