Antigenic cartography of SARS-CoV-2 reveals that Omicron BA.1 and BA.2 are antigenically distinct

Science immunology - Tập 7 Số 75 - 2022
Anna Z. Mykytyn1, Melanie Rissmann1, Adinda Kok1, Miruna E. Rosu1, Debby Schipper1, Tim I. Breugem1, Petra B. van den Doel1, Felicity Chandler1, Theo M. Bestebroer1, Maurice de Wit2, Martin E. van Royen3, Richard Molenkamp1, Bas B. Oude Munnink1, Rory D. de Vries1, Corine H. GeurtsvanKessel1, Derek J. Smith4, Marion Koopmans1, Barry Rockx1, Mart M. Lamers1, Ron A. M. Fouchier1, Bart L. Haagmans1
1Viroscience Department, Erasmus Medical Center, Rotterdam, Netherlands.
2Department of Neurology, Erasmus University Medical Center, Rotterdam, Netherlands
3Department of Pathology, Erasmus University Medical Center, Rotterdam, Netherlands
4Center for Pathogen Evolution, Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK.

Tóm tắt

The emergence and rapid spread of SARS-CoV-2 variants may affect vaccine efficacy substantially. The Omicron variant termed BA.2, which differs substantially from BA.1 based on genetic sequence, is currently replacing BA.1 in several countries, but its antigenic characteristics have not yet been assessed. Here, we used antigenic cartography to quantify and visualize antigenic differences between early SARS-CoV-2 variants (614G, Alpha, Beta, Gamma, Zeta, Delta, and Mu) using hamster antisera obtained after primary infection. We first verified that the choice of the cell line for the neutralization assay did not affect the topology of the map substantially. Antigenic maps generated using pseudo-typed SARS-CoV-2 on the widely used VeroE6 cell line and the human airway cell line Calu-3 generated similar maps. Maps made using authentic SARS-CoV-2 on Calu-3 cells also closely resembled those generated with pseudo-typed viruses. The antigenic maps revealed a central cluster of SARS-CoV-2 variants, which grouped on the basis of mutual spike mutations. Whereas these early variants are antigenically similar, clustering relatively close to each other in antigenic space, Omicron BA.1 and BA.2 have evolved as two distinct antigenic outliers. Our data show that BA.1 and BA.2 both escape vaccine-induced antibody responses as a result of different antigenic characteristics. Thus, antigenic cartography could be used to assess antigenic properties of future SARS-CoV-2 variants of concern that emerge and to decide on the composition of novel spike-based (booster) vaccines.

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Science immunology

Tập 7 Số 75

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