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Nat Commun ; 14(1): 2249, 2023 04 19.
Article in English | MEDLINE | ID: mdl-37076511

ABSTRACT

Vaccination of SARS-CoV-2 convalescent individuals generates broad and potent antibody responses. Here, we isolate 459 spike-specific monoclonal antibodies (mAbs) from two individuals who were infected with the index variant of SARS-CoV-2 and later boosted with mRNA-1273. We characterize mAb genetic features by sequence assignments to the donors' personal immunoglobulin genotypes and assess antibody neutralizing activities against index SARS-CoV-2, Beta, Delta, and Omicron variants. The mAbs used a broad range of immunoglobulin heavy chain (IGH) V genes in the response to all sub-determinants of the spike examined, with similar characteristics observed in both donors. IGH repertoire sequencing and B cell lineage tracing at longitudinal time points reveals extensive evolution of SARS-CoV-2 spike-binding antibodies from acute infection until vaccination five months later. These results demonstrate that highly polyclonal repertoires of affinity-matured memory B cells are efficiently recalled by vaccination, providing a basis for the potent antibody responses observed in convalescent persons following vaccination.


Subject(s)
COVID-19 , SARS-CoV-2 , Humans , Cell Lineage , COVID-19/prevention & control , B-Lymphocytes , Antibodies, Monoclonal , Antibodies, Neutralizing , Antibodies, Viral , Spike Glycoprotein, Coronavirus/genetics , Vaccination
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