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SARS-CoV-2 escape in vitro from a highly neutralizing COVID-19 convalescent plasma

Andreano, Emanuele, Piccini, Giulia, Licastro, Danilo, Casalino, Lorenzo, Johnson, Nicole V., Paciello, Ida, Monego, Simeone Dal, Pantano, Elisa, Manganaro, Noemi, Manenti, Alessandro, Manna, Rachele, Casa, Elisa, Hyseni, Inesa, Benincasa, Linda, Montomoli, Emanuele, Amaro, Rommie E., McLellan, Jason S., Rappuoli, Rino·2020

Preprint — published as 10.1073/pnas.2103154118

Abstract

To investigate the evolution of SARS-CoV-2 in the immune population, we co-incubated authentic virus with a highly neutralizing plasma from a COVID-19 convalescent patient. The plasma fully neutralized the virus for 7 passages, but after 45 days, the deletion of F140 in the spike N-terminal domain (NTD) N3 loop led to partial breakthrough. At day 73, an E484K substitution in the receptor-binding domain (RBD) occurred, followed at day 80 by an insertion in the NTD N5 loop containing a new glycan sequon, which generated a variant completely resistant to plasma neutralization. Computational modeling predicts that the deletion and insertion in loops N3 and N5 prevent binding of neutralizing antibodies. The recent emergence in the United Kingdom and South Africa of natural variants with similar changes suggests that SARS-CoV-2 has the potential to escape an effective immune response and that vaccines and antibodies able to control emerging variants should be developed. One Sentence Summary: Three mutations allowed SARS-CoV-2 to evade the polyclonal antibody response of a highly neutralizing COVID-19 convalescent plasma.

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  1. A. Manenti et al., Evaluation of SARS-CoV-2 neutralizing antibodies using a CPE-based colorimetric live virus micro-neutralization assay in human serum samples. Journal of medical virology, (2020). · DOI
  2. X. Chi et al., A neutralizing human antibody binds to the N-terminal domain of the Spike protein of SARS-CoV-2. 369, 650–655 (2020). · DOI · Paper page

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Authors
Andreano, E., Piccini, G., Licastro, D., Casalino, L., Johnson, N. V., Paciello, I., Monego, S. D., Pantano, E., Manganaro, N., Manenti, A., Manna, R., Casa, E., Hyseni, I., Benincasa, L., Montomoli, E., Amaro, R. E., McLellan, J. S., & Rappuoli, R.
Publisher
openRxiv
Published
2020-12-28
References
56
Type
Preprint

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