Antibody evasion properties of SARS-CoV-2 Omicron sublineages

Author:

Iketani ShoORCID,Liu Lihong,Guo YichengORCID,Liu Liyuan,Chan Jasper F.-W.ORCID,Huang Yiming,Wang Maple,Luo YangORCID,Yu Jian,Chu HinORCID,Chik Kenn K.-H.,Yuen Terrence T.-T.,Yin Michael T.,Sobieszczyk Magdalena E.,Huang YaoxingORCID,Yuen Kwok-YungORCID,Wang Harris H.ORCID,Sheng Zizhang,Ho David D.ORCID

Abstract

AbstractThe identification of the Omicron (B.1.1.529.1 or BA.1) variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in Botswana in November 20211 immediately caused concern owing to the number of alterations in the spike glycoprotein that could lead to antibody evasion. We2 and others3–6 recently reported results confirming such a concern. Continuing surveillance of the evolution of Omicron has since revealed the rise in prevalence of two sublineages, BA.1 with an R346K alteration (BA.1+R346K, also known as BA.1.1) and B.1.1.529.2 (BA.2), with the latter containing 8 unique spike alterations and lacking 13 spike alterations found in BA.1. Here we extended our studies to include antigenic characterization of these new sublineages. Polyclonal sera from patients infected by wild-type SARS-CoV-2 or recipients of current mRNA vaccines showed a substantial loss in neutralizing activity against both BA.1+R346K and BA.2, with drops comparable to that already reported for BA.1 (refs. 2,3,5,6). These findings indicate that these three sublineages of Omicron are antigenically equidistant from the wild-type SARS-CoV-2 and thus similarly threaten the efficacies of current vaccines. BA.2 also exhibited marked resistance to 17 of 19 neutralizing monoclonal antibodies tested, including S309 (sotrovimab)7, which had retained appreciable activity against BA.1 and BA.1+R346K (refs. 2–4,6). This finding shows that no authorized monoclonal antibody therapy could adequately cover all sublineages of the Omicron variant, except for the recently authorized LY-CoV1404 (bebtelovimab).

Funder

Bill and Melinda Gates Foundation

JPB Foundation

Andrew and Peggy Cherng, Samuel Yin, Carol Ludwig, David and Roger Wu

Health@InnoHK

National Science Foundation

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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