Scientific consortium provides real-time risk assessment of SARS-CoV-2 variants on immune protection
Faculty from the Departments of Microbiology, Medicine Genetics and Genomic Sciences, and Pathology and Molecular Cell-Based Medicine at the Icahn School of Medicine at Mount Sinai play key roles in a National Institutes of Health (NIH) program set up to provide a real-time risk assessment of variants of SARS-CoV-2, the virus that causes COVID-19. The program, called SARS-CoV-2 Assessment of Viral Evolution (SAVE) and described in a paper published March 31 in Nature, assesses how the variants might affect transmission, virulence, and resistance to both disease-induced (convalescent) and vaccine-induced immunity.
The SAVE program was established by the National Institute of Allergy and Infectious Diseases (NIAID), part of NIH, in January 2021 to address the global public health threat caused by increasing SARS-CoV-2 genomic diversity and the emergence of viral variants that jeopardize the protective antiviral immunity following infection or vaccination. It uses a coordinated approach to identify and curate data about these variants, their impact on immunity, and their effects on vaccine protection.
“Collaborative science and open sharing of results in near real-time amongst an international team of scientists has defined the SAVE program and has facilitated rapid prioritization, reagent development, testing, and assessment of SARS-CoV-2 variants,” said Florian Krammer, Ph.D., Mount Sinai Professor of Vaccinology at Icahn Mount Sinai, Co-Chair of the SAVE program’s In Vitro group and co-corresponding author of the paper. “The SAVE program serves as a template for response to not only SARS-CoV-2 variants but for other emerging pathogens.”
The SAVE program is composed of an international team of scientists with expertise in virology, immunology, vaccinology, structural biology, bioinformatics, viral genetics, and evolution. It was formed as a critical data-generating component for the U.S. Department of Health and Human Services’ SARS-CoV-2 Interagency Group (SIG) and to facilitate rapid data-sharing with global partners and the scientific community. Each team member is responsible for key contributions ranging from curation of viral mutations, bioinformatics analysis, development of novel reagents, assay development and testing, in vitro characterization, and in vivo model development to countermeasure testing.
The SAVE program is divided into three working groups: (1) Early Detection and Analysis group; (2) In Vitro group; (3) In Vivo group. The Early Detection group uses public databases and analysis tools to curate and prioritize emerging SARS-CoV-2 variants. The In Vitro group evaluates the impact of SARS-CoV-2 variants on humoral and cell-mediated immune responses using in vitro assays. The In Vivo group uses small and large animal models to test vaccine efficacy, and define immune mechanisms and correlates of protection. Collaborative efforts between the Early Detection geneticists and evolutionary biologists, and the In Vitro group of virologists/immunologists allow for rapid determination of relationships between viral evolution and neutralization sensitivity. In turn, these results enable the In Vivo team to assess and evaluate protection provided by vaccination and/or previous infection in animal studies.
The emergence of the B.1.1.529 variant (Omicron, which includes BA.1, BA.1.1 and BA.2), containing more than 30 mutations in the spike protein, threatened to reduce the effectiveness of clinically approved COVID-19 monoclonal antibody therapies and infection- and vaccine-induced immunity to the virus. The SAVE program rapidly responded by generating plasmids and spike protein, identifying the first Omicron cases (BA.1) in New York City, isolating, propagating, and distributing authentic Omicron viral stocks, sharing reagents, performing binding and neutralization assays, and evaluating virus infection across different animal models. The data from these studies were rapidly shared with government agencies and submitted as manuscripts on pre-print servers to inform the wider scientific community.
Icahn Mount Sinai faculty members who are key to this effort include:
- Harm van Bakel, Ph.D.—Serves as a member of the Early Detection and Analysis group. His lab leverages data they generated as part of the Mount Sinai Pathogen Surveillance Program, as well as data from public repositories to identify and prioritize novel emerging variants for isolation and further characterization.
- Adolfo García-Sastre, Ph.D., and Michael Schotsaert, Ph.D.—Lead the In Vivo efforts through the Global Health and Emerging Pathogens and Tisch Cancer Institutes at Icahn Mount Sinai. Their labs have set up SARS-CoV-2 animal infection models and have vaccinated animals available that can be used to test efficacy against variants of concern as soon as they emerge.
- Viviana Simon, MD, Ph.D.—Serves as a member of the In Vitro group and oversees the characterization of disease-causing viral variants cultured from samples collected from patients seeking care at the Mount Sinai Health System.
- Florian Krammer, Ph.D.—Serves as co-chair of the In Vitro group. In addition, the Krammer laboratory provides critical insights into how well sera from COVID-19 vaccinated individuals continues to neutralize variants.
“As is described in the paper, there are many critical and time-sensitive components that are involved in a successful response to emerging variants,” said Viviana Simon, MD,Ph.D., Professor of Microbiology and Medicine and faculty member of the Global Health and Emerging Pathogens Institute at Icahn Mount Sinai, and a member of the In Vitro group of the SAVE program. “Partnerships like the SAVE program must continue to include scientists from around the world to ensure that variants are rapidly identified and characterized so that we can effectively counter the constant threat emerging pathogens pose against global public health.”
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