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Dyba M, Denson JP, Maciag AE. MALDI-TOF Mass Spectrometry-Based Assay for Measuring Covalent Target Engagement of KRAS G12C Inhibitors. Methods Mol Biol 2024; 2797:145-157. [PMID: 38570458 DOI: 10.1007/978-1-0716-3822-4_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
MALDI-TOF mass spectrometry enables high-throughput screening of covalent fragment libraries and SAR compound progressions of selective KRAS G12C inhibitors. Using the MALDI-TOF platform instead of the more traditional ESI-MS TOF/orbitrap instrumentation can radically shorten sample acquisition time, allowing up to 384 samples to be screened in 30 min. The typical throughput for a covalent library screen is 1152 samples per 8 h, including processing, calculation, and reporting steps. The throughput can be doubled without any significant assay modification.
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Affiliation(s)
- Marcin Dyba
- NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, USA.
| | - John-Paul Denson
- NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Anna E Maciag
- NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
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Karkanitsa M, Li Y, Valenti S, Spathies J, Kelly S, Hunsberger S, Yee L, Croker JA, Wang J, Alfonso AL, Faust M, Mehalko J, Drew M, Denson JP, Putman Z, Fathi P, Ngo TB, Siripong N, Baus HA, Petersen B, Ford EW, Sundaresan V, Josyula A, Han A, Giurgea LT, Rosas LA, Bean R, Athota R, Czajkowski L, Klumpp-Thomas C, Cervantes-Medina A, Gouzoulis M, Reed S, Graubard B, Hall MD, Kalish H, Esposito D, Kimberly RP, Reis S, Sadtler K, Memoli MJ. Dynamics of SARS-CoV-2 Seroprevalence in a Large US population Over a Period of 12 Months. medRxiv 2023:2023.10.20.23297329. [PMID: 37904956 PMCID: PMC10614993 DOI: 10.1101/2023.10.20.23297329] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Due to a combination of asymptomatic or undiagnosed infections, the proportion of the United States population infected with SARS-CoV-2 was unclear from the beginning of the pandemic. We previously established a platform to screen for SARS-CoV-2 positivity across a representative proportion of the US population, from which we reported that almost 17 million Americans were estimated to have had undocumented infections in the Spring of 2020. Since then, vaccine rollout and prevalence of different SARS-CoV-2 variants have further altered seropositivity trends within the United States population. To explore the longitudinal impacts of the pandemic and vaccine responses on seropositivity, we re-enrolled participants from our baseline study in a 6- and 12- month follow-up study to develop a longitudinal antibody profile capable of representing seropositivity within the United States during a critical period just prior to and during the initiation of vaccine rollout. Initial measurements showed that, since July 2020, seropositivity elevated within this population from 4.8% at baseline to 36.2% and 89.3% at 6 and 12 months, respectively. We also evaluated nucleocapsid seropositivity and compared to spike seropositivity to identify trends in infection versus vaccination relative to baseline. These data serve as a window into a critical timeframe within the COVID-19 pandemic response and serve as a resource that could be used in subsequent respiratory illness outbreaks.
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Affiliation(s)
- Maria Karkanitsa
- Section on Immunoengineering, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda MD 20894
| | - Yan Li
- Joint Program in Survey Methodology, Department of Epidemiology and Biostatistics, University of Maryland College Park, College Park, MD 20742
| | - Shannon Valenti
- Clinical and Translational Science Institute (CTSI), University of Pittsburgh, Pittsburgh, PA 15213
| | - Jacquelyn Spathies
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science (BEPS), NIBIB, NIH, Bethesda MD 20894
| | - Sophie Kelly
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science (BEPS), NIBIB, NIH, Bethesda MD 20894
| | - Sally Hunsberger
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases (NIAID), NIH, Bethesda, MD 20894
| | - Laura Yee
- Division of Cancer Treatment and Diagnosis, National Cancer Institute (NCI), NIH, MD 20894
| | - Jennifer A. Croker
- Center for Clinical and Translational Science, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jing Wang
- Clinical Monitoring Research Program Directorate, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Andrea Lucia Alfonso
- Section on Immunoengineering, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda MD 20894
| | - Mondreakest Faust
- Section on Immunoengineering, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda MD 20894
| | - Jennifer Mehalko
- Protein Expression Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702
| | - Matthew Drew
- Protein Expression Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702
| | - John-Paul Denson
- Protein Expression Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702
| | - Zoe Putman
- Protein Expression Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702
| | - Parinaz Fathi
- Section on Immunoengineering, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda MD 20894
| | - Tran B. Ngo
- Section on Immunoengineering, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda MD 20894
| | - Nalyn Siripong
- Clinical and Translational Science Institute (CTSI), University of Pittsburgh, Pittsburgh, PA 15213
| | - Holly Ann Baus
- Laboratory of Immunoregulation, NIAID, NIH, Bethesda MD 20894
| | - Brian Petersen
- Clinical and Translational Science Institute (CTSI), University of Pittsburgh, Pittsburgh, PA 15213
| | - Eric W. Ford
- Department of Health Care Organization, and Policy, School of Public Health, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Vanathi Sundaresan
- Section on Immunoengineering, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda MD 20894
| | - Aditya Josyula
- Section on Immunoengineering, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda MD 20894
| | - Alison Han
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
| | - Luca T. Giurgea
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
| | - Luz Angela Rosas
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
| | - Rachel Bean
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
| | - Rani Athota
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
| | - Lindsay Czajkowski
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
| | - Carleen Klumpp-Thomas
- National Center for Advancing Translational Sciences (NCATS), NIH, Rockville, MD 20850
| | | | - Monica Gouzoulis
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
| | - Susan Reed
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
| | - Barry Graubard
- Division of Cancer Epidemiology & Genetics, Biostatistics Branch, NCI, NIH, Bethesda, MD 20894
| | - Matthew D. Hall
- National Center for Advancing Translational Sciences (NCATS), NIH, Rockville, MD 20850
| | - Heather Kalish
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science (BEPS), NIBIB, NIH, Bethesda MD 20894
| | - Dominic Esposito
- Protein Expression Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702
| | - Robert P. Kimberly
- Center for Clinical and Translational Science, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Steven Reis
- Clinical and Translational Science Institute (CTSI), University of Pittsburgh, Pittsburgh, PA 15213
| | - Kaitlyn Sadtler
- Section on Immunoengineering, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda MD 20894
| | - Matthew J Memoli
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, NIAID, NIH, Bethesda, MD 20894
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3
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Kalish H, Klumpp-Thomas C, Hunsberger S, Baus HA, Fay MP, Siripong N, Wang J, Hicks J, Mehalko J, Travers J, Drew M, Pauly K, Spathies J, Ngo T, Adusei KM, Karkanitsa M, Croker JA, Li Y, Graubard BI, Czajkowski L, Belliveau O, Chairez C, Snead KR, Frank P, Shunmugavel A, Han A, Giurgea LT, Rosas LA, Bean R, Athota R, Cervantes-Medina A, Gouzoulis M, Heffelfinger B, Valenti S, Caldararo R, Kolberg MM, Kelly A, Simon R, Shafiq S, Wall V, Reed S, Ford EW, Lokwani R, Denson JP, Messing S, Michael SG, Gillette W, Kimberly RP, Reis SE, Hall MD, Esposito D, Memoli MJ, Sadtler K. Undiagnosed SARS-CoV-2 seropositivity during the first 6 months of the COVID-19 pandemic in the United States. Sci Transl Med 2021; 13:eabh3826. [PMID: 34158410 PMCID: PMC8432952 DOI: 10.1126/scitranslmed.abh3826] [Citation(s) in RCA: 75] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 06/16/2021] [Indexed: 12/14/2022]
Abstract
Asymptomatic SARS-CoV-2 infection and delayed implementation of diagnostics have led to poorly defined viral prevalence rates in the United States and elsewhere. To address this, we analyzed seropositivity in 9089 adults in the United States who had not been diagnosed previously with COVID-19. Individuals with characteristics that reflected the U.S. population (n = 27,716) were selected by quota sampling from 462,949 volunteers. Enrolled participants (n = 11,382) provided medical, geographic, demographic, and socioeconomic information and dried blood samples. Survey questions coincident with the Behavioral Risk Factor Surveillance System survey, a large probability-based national survey, were used to adjust for selection bias. Most blood samples (88.7%) were collected between 10 May and 31 July 2020 and were processed using ELISA to measure seropositivity (IgG and IgM antibodies against SARS-CoV-2 spike protein and the spike protein receptor binding domain). The overall weighted undiagnosed seropositivity estimate was 4.6% (95% CI, 2.6 to 6.5%), with race, age, sex, ethnicity, and urban/rural subgroup estimates ranging from 1.1% to 14.2%. The highest seropositivity estimates were in African American participants; younger, female, and Hispanic participants; and residents of urban centers. These data indicate that there were 4.8 undiagnosed SARS-CoV-2 infections for every diagnosed case of COVID-19, and an estimated 16.8 million infections were undiagnosed by mid-July 2020 in the United States.
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Affiliation(s)
- Heather Kalish
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Carleen Klumpp-Thomas
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850, USA
| | - Sally Hunsberger
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Holly Ann Baus
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Michael P Fay
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Nalyn Siripong
- Clinical and Translational Science Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Jing Wang
- Clinical Monitoring Research Program Directorate, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Jennifer Hicks
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Jameson Travers
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850, USA
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Kyle Pauly
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Jacquelyn Spathies
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Tran Ngo
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Kenneth M Adusei
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Maria Karkanitsa
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Jennifer A Croker
- Center for Clinical and Translational Science, School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Yan Li
- Joint Program in Survey Methodology, Department of Epidemiology and Biostatistics, University of Maryland College Park, College Park, MD 20742, USA
| | - Barry I Graubard
- Division of Cancer Epidemiology and Genetics, Biostatistics Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20894, USA
| | - Lindsay Czajkowski
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Olivia Belliveau
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Cheryl Chairez
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Kelly R Snead
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Peter Frank
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Anandakumar Shunmugavel
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Alison Han
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Luca T Giurgea
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Luz Angela Rosas
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Rachel Bean
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Rani Athota
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Adriana Cervantes-Medina
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Monica Gouzoulis
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Brittany Heffelfinger
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Shannon Valenti
- Clinical and Translational Science Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Rocco Caldararo
- Clinical Research Directorate, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research Inc., Frederick, MD 21702, USA
| | - Michelle M Kolberg
- Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Andrew Kelly
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850, USA
| | - Reid Simon
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850, USA
| | - Saifullah Shafiq
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850, USA
| | - Vanessa Wall
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Susan Reed
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA
| | - Eric W Ford
- Center for Clinical and Translational Science, School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Ravi Lokwani
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Simon Messing
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Sam G Michael
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850, USA
| | - William Gillette
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Robert P Kimberly
- Center for Clinical and Translational Science, School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Steven E Reis
- Clinical and Translational Science Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Matthew D Hall
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850, USA
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
| | - Matthew J Memoli
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894, USA.
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA.
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Hicks J, Klumpp-Thomas C, Kalish H, Shunmugavel A, Mehalko J, Denson JP, Snead KR, Drew M, Corbett KS, Graham BS, Hall MD, Memoli MJ, Esposito D, Sadtler K. Serologic Cross-Reactivity of SARS-CoV-2 with Endemic and Seasonal Betacoronaviruses. J Clin Immunol 2021; 41:906-913. [PMID: 33725211 PMCID: PMC7962425 DOI: 10.1007/s10875-021-00997-6] [Citation(s) in RCA: 106] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 02/15/2021] [Indexed: 12/31/2022]
Abstract
In order to properly understand the spread of SARS-CoV-2 infection and development of humoral immunity, researchers have evaluated the presence of serum antibodies of people worldwide experiencing the pandemic. These studies rely on the use of recombinant proteins from the viral genome in order to identify serum antibodies that recognize SARS-CoV-2 epitopes. Here, we discuss the cross-reactivity potential of SARS-CoV-2 antibodies with the full spike proteins of four other betacoronaviruses that cause disease in humans, MERS-CoV, SARS-CoV, HCoV-OC43, and HCoV-HKU1. Using enzyme-linked immunosorbent assays (ELISAs), we detected the potential cross-reactivity of antibodies against SARS-CoV-2 towards the four other coronaviruses, with the strongest cross-recognition between SARS-CoV-2 and SARS /MERS-CoV antibodies, as expected based on sequence homology of their respective spike proteins. Further analysis of cross-reactivity could provide informative data that could lead to intelligently designed pan-coronavirus therapeutics or vaccines.
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Affiliation(s)
- Jennifer Hicks
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20894, USA.,Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Carleen Klumpp-Thomas
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, 20850, USA
| | - Heather Kalish
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20894, USA.,Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Anandakumar Shunmugavel
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Kelly R Snead
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Kizzmekia S Corbett
- Vaccine Research Center, National Institute for Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Barney S Graham
- Vaccine Research Center, National Institute for Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Matthew D Hall
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, 20850, USA
| | - Matthew J Memoli
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, Division of Intramural Research, National Institute for Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20892, USA.
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5
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Kalish H, Klumpp-Thomas C, Hunsberger S, Baus HA, Fay MP, Siripong N, Wang J, Hicks J, Mehalko J, Travers J, Drew M, Pauly K, Spathies J, Ngo T, Adusei KM, Karkanitsa M, Croker JA, Li Y, Graubard BI, Czajkowski L, Belliveau O, Chairez C, Snead K, Frank P, Shunmugavel A, Han A, Giurgea LT, Rosas LA, Bean R, Athota R, Cervantes-Medina A, Gouzoulis M, Heffelfinger B, Valenti S, Caldararo R, Kolberg MM, Kelly A, Simon R, Shafiq S, Wall V, Reed S, Ford EW, Lokwani R, Denson JP, Messing S, Michael SG, Gillette W, Kimberly RP, Reis SE, Hall MD, Esposito D, Memoli MJ, Sadtler K. Mapping a Pandemic: SARS-CoV-2 Seropositivity in the United States. medRxiv 2021:2021.01.27.21250570. [PMID: 33532807 PMCID: PMC7852277 DOI: 10.1101/2021.01.27.21250570] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/20/2023]
Abstract
Asymptomatic SARS-CoV-2 infection and delayed implementation of diagnostics have led to poorly defined viral prevalence rates. To address this, we analyzed seropositivity in US adults who have not previously been diagnosed with COVID-19. Individuals with characteristics that reflect the US population (n = 11,382) and who had not previously been diagnosed with COVID-19 were selected by quota sampling from 241,424 volunteers (ClinicalTrials.gov NCT04334954). Enrolled participants provided medical, geographic, demographic, and socioeconomic information and 9,028 blood samples. The majority (88.7%) of samples were collected between May 10th and July 31st, 2020. Samples were analyzed via ELISA for anti-Spike and anti-RBD antibodies. Estimation of seroprevalence was performed by using a weighted analysis to reflect the US population. We detected an undiagnosed seropositivity rate of 4.6% (95% CI: 2.6 - 6.5%). There was distinct regional variability, with heightened seropositivity in locations of early outbreaks. Subgroup analysis demonstrated that the highest estimated undiagnosed seropositivity within groups was detected in younger participants (ages 18-45, 5.9%), females (5.5%), Black/African American (14.2%), Hispanic (6.1%), and Urban residents (5.3%), and lower undiagnosed seropositivity in those with chronic diseases. During the first wave of infection over the spring/summer of 2020 an estimate of 4.6% of adults had a prior undiagnosed SARS-CoV-2 infection. These data indicate that there were 4.8 (95% CI: 2.8-6.8) undiagnosed cases for every diagnosed case of COVID-19 during this same time period in the United States, and an estimated 16.8 million undiagnosed cases by mid-July 2020.
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Affiliation(s)
- Heather Kalish
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Carleen Klumpp-Thomas
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Sally Hunsberger
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Holly Ann Baus
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Michael P Fay
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Nalyn Siripong
- Clinical and Translational Science Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Jing Wang
- Clinical Monitoring Research Program Directorate, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Jennifer Hicks
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Jameson Travers
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Kyle Pauly
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Jacquelyn Spathies
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Tran Ngo
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Kenneth M. Adusei
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Maria Karkanitsa
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Jennifer A Croker
- Center for Clinical and Translational Science, School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Yan Li
- Joint Program in Survey Methodology, Department of Epidemiology and Biostatistics, University of Maryland College Park, College Park, MD 20742
| | - Barry I. Graubard
- Division of Cancer Epidemiology & Genetics, Biostatistics Branch, National Cancer Institute, National Institutes of Health, Bethesda MD 20894
| | - Lindsay Czajkowski
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Olivia Belliveau
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Cheryl Chairez
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Kelly Snead
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Peter Frank
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Anandakumar Shunmugavel
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Alison Han
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Luca T. Giurgea
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Luz Angela Rosas
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Rachel Bean
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Rani Athota
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Adriana Cervantes-Medina
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Monica Gouzoulis
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Brittany Heffelfinger
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Shannon Valenti
- Clinical and Translational Science Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Rocco Caldararo
- Clinical Research Directorate, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc, Frederick MD 21702
| | - Michelle M. Kolberg
- Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Andrew Kelly
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Reid Simon
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Saifullah Shafiq
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Vanessa Wall
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Susan Reed
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Eric W Ford
- Center for Clinical and Translational Science, School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Ravi Lokwani
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Simon Messing
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Sam G. Michael
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - William Gillette
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Robert P. Kimberly
- Center for Clinical and Translational Science, School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Steven E. Reis
- Clinical and Translational Science Institute, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Matthew D. Hall
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD 20850
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick MD 21702
| | - Matthew J. Memoli
- Clinical Studies Unit, Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20894
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
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6
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Klumpp-Thomas C, Kalish H, Drew M, Hunsberger S, Snead K, Fay MP, Mehalko J, Shunmugavel A, Wall V, Frank P, Denson JP, Hong M, Gulten G, Messing S, Hicks J, Michael S, Gillette W, Hall MD, Memoli MJ, Esposito D, Sadtler K. Standardization of ELISA protocols for serosurveys of the SARS-CoV-2 pandemic using clinical and at-home blood sampling. Nat Commun 2021; 12:113. [PMID: 33397956 PMCID: PMC7782755 DOI: 10.1038/s41467-020-20383-x] [Citation(s) in RCA: 88] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 11/29/2020] [Indexed: 01/08/2023] Open
Abstract
The extent of SARS-CoV-2 infection throughout the United States population is currently unknown. High quality serology is key to avoiding medically costly diagnostic errors, as well as to assuring properly informed public health decisions. Here, we present an optimized ELISA-based serology protocol, from antigen production to data analyses, that helps define thresholds for IgG and IgM seropositivity with high specificities. Validation of this protocol is performed using traditionally collected serum as well as dried blood on mail-in blood sampling kits. Archival (pre-2019) samples are used as negative controls, and convalescent, PCR-diagnosed COVID-19 patient samples serve as positive controls. Using this protocol, minimal cross-reactivity is observed for the spike proteins of MERS, SARS1, OC43 and HKU1 viruses, and no cross reactivity is observed with anti-influenza A H1N1 HAI. Our protocol may thus help provide standardized, population-based data on the extent of SARS-CoV-2 seropositivity, immunity and infection.
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Affiliation(s)
- Carleen Klumpp-Thomas
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, 20850, USA
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Heather Kalish
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Sally Hunsberger
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Kelly Snead
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Michael P Fay
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Anandakumar Shunmugavel
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Vanessa Wall
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Peter Frank
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Min Hong
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Gulcin Gulten
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Simon Messing
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Jennifer Hicks
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Sam Michael
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, 20850, USA
| | - William Gillette
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Matthew D Hall
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville, MD, 20850, USA
| | - Matthew J Memoli
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20894, USA.
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7
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Mehalko J, Drew M, Snead K, Denson JP, Wall V, Taylor T, Sadtler K, Messing S, Gillette W, Esposito D. Improved production of SARS-CoV-2 spike receptor-binding domain (RBD) for serology assays. Protein Expr Purif 2020; 179:105802. [PMID: 33248226 PMCID: PMC7687410 DOI: 10.1016/j.pep.2020.105802] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 11/19/2020] [Accepted: 11/20/2020] [Indexed: 01/20/2023]
Abstract
The receptor-binding domain (RBD) of the SARS-CoV-2 spike protein is a commonly used antigen for serology assays critical to determining the extent of SARS-CoV-2 exposure in the population. Different versions of the RBD protein have been developed and utilized in assays, with higher sensitivity attributed to particular forms of the protein. To improve the yield of these high-sensitivity forms of RBD and support the increased demand for this antigen in serology assays, we investigated several protein expression variables including DNA elements such as promoters and signal peptides, cell culture expression parameters, and purification processes. Through this investigation, we developed a simplified and robust purification strategy that consistently resulted in high levels of the high-sensitivity form of RBD and demonstrated that a carboxyterminal tag is responsible for the increased sensitivity in the ELISA. These improved reagents and processes produce high-quality proteins which are functional in serology assays and can be used to investigate seropositivity to SARS-CoV-2 infection. Improved yields of SARS-CoV-2 spike RBD through modification of DNA constructs and purification parameters. Two versions of RBD show different sensitivity in serology assays. Yields of greater than 50 mg/l obtained under optimal conditions. Magnetic bead purification technology improves throughput of protein production.
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Affiliation(s)
- Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Kelly Snead
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Vanessa Wall
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Troy Taylor
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute for Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894, USA
| | - Simon Messing
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - William Gillette
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA.
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8
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Mehalko J, Drew M, Snead K, Denson JP, Wall V, Taylor T, Sadtler K, Messing S, Gillette W, Esposito D. Improved production of SARS-CoV-2 spike receptor-binding domain (RBD) for serology assays. bioRxiv 2020:2020.11.18.388868. [PMID: 33236017 PMCID: PMC7685350 DOI: 10.1101/2020.11.18.388868] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The receptor-binding domain (RBD) of the SARS-CoV-2 spike protein is a commonly used antigen for serology assays critical to determining the extent of SARS-CoV-2 exposure in the population. Different versions of the RBD protein have been developed and utilized in assays, with higher sensitivity attributed to particular forms of the protein. To improve the yield of these high-sensitivity forms of RBD and support the increased demand for this antigen in serology assays, we investigated several protein expression variables including DNA elements such as promoters and signal peptides, cell culture expression parameters, and purification processes. Through this investigation, we developed a simplified and robust purification strategy that consistently resulted in high levels of the high-sensitivity form of RBD and demonstrated that a carboxyterminal tag is responsible for the increased sensitivity in the ELISA. These improved reagents and processes produce high-quality proteins which are functional in serology assays and can be used to investigate seropositivity to SARS-CoV-2 infection. Highlights: Improved yields of SARS-CoV-2 spike RBD through modification of DNA constructs and purification parametersTwo versions of RBD show different sensitivity in serology assaysYields of greater than 50 mg/l obtained under optimal conditionsMagnetic bead purification technology improves throughput of protein production.
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Affiliation(s)
- Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
| | - Kelly Snead
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
| | - Vanessa Wall
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
| | - Troy Taylor
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute for Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20894
| | - Simon Messing
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
| | - William Gillette
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD 21702
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9
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Esposito D, Mehalko J, Drew M, Snead K, Wall V, Taylor T, Frank P, Denson JP, Hong M, Gulten G, Sadtler K, Messing S, Gillette W. Optimizing high-yield production of SARS-CoV-2 soluble spike trimers for serology assays. Protein Expr Purif 2020; 174:105686. [PMID: 32504802 PMCID: PMC7271859 DOI: 10.1016/j.pep.2020.105686] [Citation(s) in RCA: 76] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/01/2020] [Accepted: 06/01/2020] [Indexed: 11/23/2022]
Abstract
The SARS-CoV-2 spike trimer is the primary antigen for several serology assays critical to determining the extent of SARS-CoV-2 exposure in the population. Until stable cell lines are developed to increase the titer of this secreted protein in mammalian cell culture, the low yield of spike protein produced from transient transfection of HEK293 cells will be a limiting factor for these assays. To improve the yield of spike protein and support the high demand for antigens in serology assays, we investigated several recombinant protein expression variables by altering the incubation temperature, harvest time, chromatography strategy, and final protein manipulation. Through this investigation, we developed a simplified and robust purification strategy that consistently yields 5 mg of protein per liter of expression culture for two commonly used forms of the SARS-CoV-2 spike protein. We show that these proteins form well-behaved stable trimers and are consistently functional in serology assays across multiple protein production lots.
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Affiliation(s)
- Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA.
| | - Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - Kelly Snead
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - Vanessa Wall
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - Troy Taylor
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - Peter Frank
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - Min Hong
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - Gulcin Gulten
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute for Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, 20894, USA
| | - Simon Messing
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
| | - William Gillette
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, MD, 21702, USA
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10
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Hicks J, Klumpp-Thomas C, Kalish H, Shunmugavel A, Mehalko J, Denson JP, Snead K, Drew M, Corbett K, Graham B, Hall MD, Memoli MJ, Esposito D, Sadtler K. Serologic cross-reactivity of SARS-CoV-2 with endemic and seasonal Betacoronaviruses. medRxiv 2020:2020.06.22.20137695. [PMID: 32596697 PMCID: PMC7315998 DOI: 10.1101/2020.06.22.20137695] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In order to properly understand the spread of SARS-CoV-2 infection and development of humoral immunity, researchers have evaluated the presence of serum antibodies of people worldwide experiencing the pandemic. These studies rely on the use of recombinant proteins from the viral genome in order to identify serum antibodies that recognize SARS-CoV-2 epitopes. Here, we discuss the cross-reactivity potential of SARS-CoV-2 antibodies with the full spike proteins of four other Betacoronaviruses that cause disease in humans, MERS-CoV, SARS-CoV, HCoV-OC43, and HCoV-HKU1. Using enzyme-linked immunosorbent assays (ELISAs), we detected the potential cross-reactivity of antibodies against SARS-CoV-2 towards the four other coronaviruses, with the strongest cross-recognition between SARS-CoV-2 and SARS /MERS-CoV antibodies, as expected based on sequence homology of their respective spike proteins. Further analysis of cross-reactivity could provide informative data that could lead to intelligently designed pan-coronavirus therapeutics or vaccines.
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Affiliation(s)
- Jennifer Hicks
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20892
| | - Carleen Klumpp-Thomas
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20892
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville MD, 20850
| | - Heather Kalish
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20892
| | - Anandakumar Shunmugavel
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20892
| | - Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Kelly Snead
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Kizzmekia Corbett
- Vaccine Research Center, National Institute for Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD 20892
| | - Barney Graham
- Vaccine Research Center, National Institute for Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD 20892
| | - Matthew D Hall
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville MD, 20850
| | - Matthew J Memoli
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, Division of Intramural Research, National Institute for Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD 20894
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20892
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11
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Esposito D, Mehalko J, Drew M, Snead K, Wall V, Taylor T, Frank P, Denson JP, Hong M, Gulten G, Sadtler K, Messing S, Gillette W. Optimizing high-yield production of SARS-CoV-2 soluble spike trimers for serology assays. bioRxiv 2020:2020.05.27.120204. [PMID: 32511418 PMCID: PMC7265690 DOI: 10.1101/2020.05.27.120204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The SARS-CoV-2 spike trimer is the primary antigen for several serology assays critical to determining the extent of SARS-CoV-2 exposure in the population. Until stable cell lines are developed to increase the titer of this secreted protein in mammalian cell culture, the low yield of spike protein produced from transient transfection of HEK293 cells will be a limiting factor for these assays. To improve the yield of spike protein and support the high demand for antigens in serology assays, we investigated several recombinant protein expression variables by altering the incubation temperature, harvest time, chromatography strategy, and final protein manipulation. Through this investigation, we developed a simplified and robust purification strategy that consistently yields 5 mg of protein per liter of expression culture for two commonly used forms of the SARS-CoV-2 spike protein. We show that these proteins form well-behaved stable trimers and are consistently functional in serology assays across multiple protein production lots.
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Affiliation(s)
- Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Kelly Snead
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Vanessa Wall
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Troy Taylor
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Peter Frank
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Min Hong
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Gulcin Gulten
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute for Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
| | - Simon Messing
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
| | - William Gillette
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc. Frederick, MD 21702
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12
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Klumpp-Thomas C, Kalish H, Drew M, Hunsberger S, Snead K, Fay MP, Mehalko J, Shunmugavel A, Wall V, Frank P, Denson JP, Hong M, Gulten G, Messing S, Hicks J, Michael S, Gillette W, Hall MD, Memoli M, Esposito D, Sadtler K. Standardization of enzyme-linked immunosorbent assays for serosurveys of the SARS-CoV-2 pandemic using clinical and at-home blood sampling. medRxiv 2020:2020.05.21.20109280. [PMID: 32511472 PMCID: PMC7265693 DOI: 10.1101/2020.05.21.20109280] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The extent of SARS-CoV-2 infection throughout the United States population is currently unknown. High quality serology is a key tool to understanding the spread of infection, immunity against the virus, and correlates of protection. Limited validation and testing of serology assays used for serosurveys can lead to unreliable or misleading data, and clinical testing using such unvalidated assays can lead to medically costly diagnostic errors and improperly informed public health decisions. Estimating prevalence and clinical decision making is highly dependent on specificity. Here, we present an optimized ELISA-based serology protocol from antigen production to data analysis. This protocol defines thresholds for IgG and IgM for determination of seropositivity with estimated specificity well above 99%. Validation was performed using both traditionally collected serum and dried blood on mail-in blood sampling kits, using archival (pre-2019) negative controls and known PCR-diagnosed positive patient controls. Minimal cross-reactivity was observed for the spike proteins of MERS, SARS1, OC43 and HKU1 viruses and no cross reactivity was observed with anti-influenza A H1N1 HAI titer during validation. This strategy is highly specific and is designed to provide good estimates of seroprevalence of SARS-CoV-2 seropositivity in a population, providing specific and reliable data from serosurveys and clinical testing which can be used to better evaluate and understand SARS-CoV-2 immunity and correlates of protection.
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Affiliation(s)
- Carleen Klumpp-Thomas
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville MD, 20850
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
| | - Heather Kalish
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
| | - Matthew Drew
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Sally Hunsberger
- Biostatistics Research Branch, National Institute for Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD 20894
| | - Kelly Snead
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Michael P Fay
- Biostatistics Research Branch, National Institute for Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD 20894
| | - Jennifer Mehalko
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Anandakumar Shunmugavel
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
| | - Vanessa Wall
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Peter Frank
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - John-Paul Denson
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Min Hong
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Gulcin Gulten
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Simon Messing
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Jennifer Hicks
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
| | - Sam Michael
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville MD, 20850
| | - William Gillette
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Matthew D Hall
- National Center for Advancing Translational Sciences, National Institutes of Health, Rockville MD, 20850
| | - Matthew Memoli
- LID Clinical Studies Unit, Laboratory of Infectious Diseases, Division of Intramural Research, National Institute for Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD 20894
| | - Dominic Esposito
- Protein Expression Laboratory, NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Kaitlyn Sadtler
- Section on Immuno-Engineering, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda MD 20894
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