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The P323L substitution in the SARS-CoV-2 polymerase (NSP12) confers a selective advantage during infection

The P323L substitution in the SARS-CoV-2 polymerase (NSP12) confers a selective advantage during infection
The P323L substitution in the SARS-CoV-2 polymerase (NSP12) confers a selective advantage during infection
Background: The mutational landscape of SARS-CoV-2 varies at the dominant viral genome sequence and minor genomic variant population. During the COVID-19 pandemic, an early substitution in the genome was the D614G change in the spike protein, associated with an increase in transmissibility. Genomes with D614G are accompanied by a P323L substitution in the viral polymerase (NSP12). However, P323L is not thought to be under strong selective pressure.RESULTS: Investigation of P323L/D614G substitutions in the population shows rapid emergence during the containment phase and early surge phase during the first wave. These substitutions emerge from minor genomic variants which become dominant viral genome sequence. This is investigated in vivo and in vitro using SARS-CoV-2 with P323 and D614 in the dominant genome sequence and L323 and G614 in the minor variant population. During infection, there is rapid selection of L323 into the dominant viral genome sequence but not G614. Reverse genetics is used to create two viruses (either P323 or L323) with the same genetic background. L323 shows greater abundance of viral RNA and proteins and a smaller plaque morphology than P323.CONCLUSIONS: These data suggest that P323L is an important contribution in the emergence of variants with transmission advantages. Sequence analysis of viral populations suggests it may be possible to predict the emergence of a new variant based on tracking the frequency of minor variant genomes. The ability to predict an emerging variant of SARS-CoV-2 in the global landscape may aid in the evaluation of medical countermeasures and non-pharmaceutical interventions.
COVID-19, Genetic Background, Genome, Viral, Humans, Mutation, Pandemics, SARS-CoV-2/genetics
1465-6906
Goldswain, Hannah
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Dong, Xiaofeng
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Penrice-Randal, Rebekah
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Alruwaili, Muhannad
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Shawli, Ghada T
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Prince, Tessa
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Williamson, Maia Kavanagh
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Raghwani, Jayna
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Randle, Nadine
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Jones, Benjamin
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Donovan-Banfield, I'ah
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Salguero, Francisco J
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Tree, Julia A
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Hall, Yper
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Hartley, Catherine
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Erdmann, Maximilian
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Bazire, James
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Jearanaiwitayakul, Tuksin
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Semple, Malcolm G
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Openshaw, Peter J M
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Baillie, J Kenneth
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Emmett, Stevan R
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Digard, Paul
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Matthews, David A
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Turtle, Lance
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Davidson, Andrew D
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Darby, Alistair C
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Carroll, Miles W
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Hiscox, Julian A
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Dushianthan, Ahilanandan
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ISARIC4C Investigators
Goldswain, Hannah
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Dong, Xiaofeng
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Penrice-Randal, Rebekah
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Alruwaili, Muhannad
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Shawli, Ghada T
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Prince, Tessa
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Williamson, Maia Kavanagh
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Raghwani, Jayna
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Randle, Nadine
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Jones, Benjamin
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Donovan-Banfield, I'ah
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Salguero, Francisco J
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Tree, Julia A
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Hall, Yper
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Hartley, Catherine
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Erdmann, Maximilian
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Bazire, James
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Jearanaiwitayakul, Tuksin
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Semple, Malcolm G
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Openshaw, Peter J M
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Baillie, J Kenneth
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Emmett, Stevan R
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Digard, Paul
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Matthews, David A
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Turtle, Lance
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Davidson, Andrew D
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Darby, Alistair C
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Carroll, Miles W
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Hiscox, Julian A
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Dushianthan, Ahilanandan
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Goldswain, Hannah, Dong, Xiaofeng, Penrice-Randal, Rebekah, Jones, Benjamin, Hartley, Catherine, Matthews, David A and Dushianthan, Ahilanandan , ISARIC4C Investigators (2023) The P323L substitution in the SARS-CoV-2 polymerase (NSP12) confers a selective advantage during infection. Genome Biology, 24 (1), [47]. (doi:10.1186/s13059-023-02881-5).

Record type: Article

Abstract

Background: The mutational landscape of SARS-CoV-2 varies at the dominant viral genome sequence and minor genomic variant population. During the COVID-19 pandemic, an early substitution in the genome was the D614G change in the spike protein, associated with an increase in transmissibility. Genomes with D614G are accompanied by a P323L substitution in the viral polymerase (NSP12). However, P323L is not thought to be under strong selective pressure.RESULTS: Investigation of P323L/D614G substitutions in the population shows rapid emergence during the containment phase and early surge phase during the first wave. These substitutions emerge from minor genomic variants which become dominant viral genome sequence. This is investigated in vivo and in vitro using SARS-CoV-2 with P323 and D614 in the dominant genome sequence and L323 and G614 in the minor variant population. During infection, there is rapid selection of L323 into the dominant viral genome sequence but not G614. Reverse genetics is used to create two viruses (either P323 or L323) with the same genetic background. L323 shows greater abundance of viral RNA and proteins and a smaller plaque morphology than P323.CONCLUSIONS: These data suggest that P323L is an important contribution in the emergence of variants with transmission advantages. Sequence analysis of viral populations suggests it may be possible to predict the emergence of a new variant based on tracking the frequency of minor variant genomes. The ability to predict an emerging variant of SARS-CoV-2 in the global landscape may aid in the evaluation of medical countermeasures and non-pharmaceutical interventions.

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More information

Accepted/In Press date: 17 February 2023
Published date: 13 March 2023
Additional Information: Funding Information: We would like to thank all members of the Hiscox Laboratory and the Centre for Genome Research for supporting SARS-CoV-2/COVID-19 sequencing research and members of ISARIC4C consortia (https://isaric4c.net/about/authors/). The authors would like to thank J. Druce and M.G. Catton from the Victorian Infectious Diseases Reference Laboratory, Royal Melbourne Hospital, at the Peter Doherty Institute for Infection and Immunity, Victoria, 3000, Australia, for providing the SARS-CoV-2 isolate used in this study. We would like to thank Oliver Schwartz for the gift of ACE2-A549 cells. ISARIC4C Investigators Consortium Lead Investigator: J Kenneth Baillie. Chief Investigator: Malcolm G Semple. Co-Lead Investigator: Peter JM Openshaw. ISARIC Clinical Coordinator: Gail Carson. Co-Investigator: Beatrice Alex, Petros Andrikopoulos, et al. Funding Information: This work was funded by U.S. Food and Drug Administration Medical Countermeasures Initiative contract (75F40120C00085) to JAH with Co-Is, MWC, ADD, AD, DAM, MGS, and LT. The article reflects the views of the authors and does not represent the views or policies of the FDA. The NHP work was funded by the Coalition of Epidemic Preparedness Innovations (CEPI) and the Medical Research Council Project CV220-060, “Development of an NHP model of infection and ADE with COVID-19 (SARS-CoV-2) both awarded to MWC. This work was also supported by the MRC (MR/W005611/1) G2P-UK: A national virology consortium to address phenotypic consequences of SARS-CoV-2 genomic variation (co-Is ADD and JAH). JAH is also funded by the Centre of Excellence in Infectious Diseases Research (CEIDR) and the Alder Hey Charity. The ISARIC4C sample collection and sequencing in this study was supported by grants from the Medical Research Council (grant MC_PC_19059), the National Institute for Health Research (NIHR; award CO-CIN-01), and the Medical Research Council (MRC; grant MC_PC_19059). JAH, MGS, MWC, and LT are supported by the NIHR Health Protection Research Unit (HPRU) in Emerging and Zoonotic Infections at University of Liverpool in partnership with the UK Health Security Agency (UKHSA), in collaboration with Liverpool School of Tropical Medicine and the University of Oxford (award 200907). LT is supported by a Wellcome Trust fellowship [205228/Z/16/Z]. PD and JKB acknowledge Institute Strategic Programme grant (no. BB/P013740/1) from the BBSRC. Publisher Copyright: © 2023, The Author(s).
Keywords: COVID-19, Genetic Background, Genome, Viral, Humans, Mutation, Pandemics, SARS-CoV-2/genetics

Identifiers

Local EPrints ID: 477881
URI: http://eprints.soton.ac.uk/id/eprint/477881
ISSN: 1465-6906
PURE UUID: 708a6cde-2ff7-44ef-b1c7-098d951764bb
ORCID for Ahilanandan Dushianthan: ORCID iD orcid.org/0000-0002-0165-3359

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Date deposited: 15 Jun 2023 17:01
Last modified: 17 Mar 2024 03:51

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Contributors

Author: Hannah Goldswain
Author: Xiaofeng Dong
Author: Rebekah Penrice-Randal
Author: Muhannad Alruwaili
Author: Ghada T Shawli
Author: Tessa Prince
Author: Maia Kavanagh Williamson
Author: Jayna Raghwani
Author: Nadine Randle
Author: Benjamin Jones
Author: I'ah Donovan-Banfield
Author: Francisco J Salguero
Author: Julia A Tree
Author: Yper Hall
Author: Catherine Hartley
Author: Maximilian Erdmann
Author: James Bazire
Author: Tuksin Jearanaiwitayakul
Author: Malcolm G Semple
Author: Peter J M Openshaw
Author: J Kenneth Baillie
Author: Stevan R Emmett
Author: Paul Digard
Author: David A Matthews
Author: Lance Turtle
Author: Andrew D Davidson
Author: Alistair C Darby
Author: Miles W Carroll
Author: Julian A Hiscox
Author: Ahilanandan Dushianthan ORCID iD
Corporate Author: ISARIC4C Investigators

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