Publication date: Jun 16, 2025

Substantial population-level variation in vaccine-specific antibody responses has been observed following global coronavirus disease 2019 (COVID-19) vaccination efforts. Beyond the influence of clinical and demographic features, immunogenetic variation is suggested to underlie divergent serological responses following COVID-19 vaccination of distinct populations. Immunoglobulin G1 (IgG1) allotypic markers (G1m) for 121 COVID-19 vaccinated healthy adults were genotyped via Sanger sequencing. Vaccine-specific IgG and Fc gamma receptor (FcγR) engagement were characterised via bead-based multiplex array. Following two COVID-19 vaccine doses, G1m1,17 compared to G1m-1,3 vaccinees had increased IgG and FcγR engagement specific for the antigenically conserved SARS-CoV-2 Spike 2 (S2) domain. IgG targeting antigenically novel SARS-CoV-2 receptor binding domain (RBD) trended higher in G1m1,17 vaccinees, facilitating increased RBD-specific FcγR2a-R131 and FcγR2b binding. Primary COVID-19 vaccination induced increased S2-specific IgG in G1m1,17 vaccinees, facilitating enhanced anti-viral FcγR engagement and suggesting immunogenetics may be a valuble consideration for next-generation vaccine design.

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Semantics

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