Reduced B cell antigenicity of Omicron lowers host serologic response

Jérôme Tubiana, Yufei Xiang, Li Fan, Haim J. Wolfson, Kong Chen, Dina Schneidman-Duhovny, Yi Shi

Research output: Contribution to journalArticlepeer-review


The SARS-CoV-2 Omicron variant evades most neutralizing vaccine-induced antibodies and is associated with lower antibody titers upon breakthrough infections than previous variants. However, the mechanism remains unclear. Here, we find using a geometric deep-learning model that Omicron's extensively mutated receptor binding site (RBS) features reduced antigenicity compared with previous variants. Mice immunization experiments with different recombinant receptor binding domain (RBD) variants confirm that the serological response to Omicron is drastically attenuated and less potent. Analyses of serum cross-reactivity and competitive ELISA reveal a reduction in antibody response across both variable and conserved RBD epitopes. Computational modeling confirms that the RBS has a potential for further antigenicity reduction while retaining efficient receptor binding. Finally, we find a similar trend of antigenicity reduction over decades for hCoV229E, a common cold coronavirus. Thus, our study explains the reduced antibody titers associated with Omicron infection and reveals a possible trajectory of future viral evolution.

Original languageEnglish
Article number111512
JournalCell Reports
Issue number3
StatePublished - 18 Oct 2022


  • CP: Immunology
  • CP: Microbiology
  • Omicron variant of concern
  • SARS-CoV-2
  • antigenicity
  • computational structural biology
  • deep learning
  • spike protein

All Science Journal Classification (ASJC) codes

  • General Biochemistry,Genetics and Molecular Biology


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