Medical laboratories are already using gene sequencing as part of a global effort to identify new variants of the coronavirus and their genetic ancestors
Thanks to advances in genetic sequencing technology that enable medical laboratories to sequence organisms faster, more accurately, and at lower cost than ever before, clinical pathology laboratories worldwide are using that capability to analyze the SARS-CoV-2 coronavirus and identify variants as they emerge in different parts of the world.
The US Centers for Disease Control and Prevention (CDC) now plans to harness the power of gene sequencing through a new consortium called SPHERES (SARS-CoV-2 Sequencing for Public Health Emergency Response, Epidemiology, and Surveillance) to “coordinate SARS-CoV-2 sequencing across the United States,” states a CDC news release. The consortium is led by the CDC’s Advanced Molecular Detection (AMD) program and “aims to generate information about the virus that will strengthen COVID-19 mitigation strategies.”
The consortium is comprised of 11 federal agencies, 20 academic institutions, state public health laboratories in 21 states, nine non-profit research organizations, and 14 lab and IVD companies, including:
- Abbott Diagnostics
- Color Genomics
- Ginkgo Bioworks
- One Codex
- Oxford Nanopore Technologies
- Pacific Biosciences
- Quest Diagnostics
- Verily Life Sciences
‘Fundamentally Changing How Public Health Responds’
Gene sequencing and related technologies have “fundamentally changed how public health responds in terms of surveillance and outbreak response,” said Duncan MacCannell, PhD, Chief Science Officer for the CDC’s Office of Advanced Molecular Detection (OAMD), in an April 30 New York Times (NYT) article, which stated that the CDC SPHERES program “will help trace patterns of transmission, investigate outbreaks, and map how the virus is evolving, which can affect a cure.”
The CDC says that rapid DNA sequencing of SARS-CoV-2 will help monitor significant changes in the virus, support contact tracing efforts, provide information for developers of diagnostics and therapies, and “advance public health research in the areas of transmission dynamics, host response, and evolution of the virus.”
The sequencing laboratories in the consortium have agreed to “release their information into the public domain quickly and in a standard way,” the NYT reported, adding that the project includes standards for what types of information medical laboratories should submit, including, “where and when a sample was taken,” and other critical details.
Sharing Data Between Sequencing Laboratories and Biotech Companies
The CDC announced the SPHERES initiative on April 30, although it launched in early April, the NYT reported.
According to the CDC, SPHERES’ objectives include:
- To bring together a network of sequencing laboratories, bioinformatics capacity and subject matter expertise under the umbrella of a massive and coordinated public health sequencing effort.
- To identify and prioritize capabilities and resource needs across the network and to align sources of federal, non-governmental, and private sector funding and support with areas of greatest impact and need.
- To improve coordination of genomic sequencing between institutions and jurisdictions and to enable more resilience across the network.
- To champion concepts of openness, standards-based analysis, and rapid data sharing throughout the United States and worldwide during the COVID-19 pandemic response.
- To accelerate data generation and sharing, including the rapid release of high-quality viral sequence data from clinical and public health laboratories into both the National Center for Biotechnology Information (NCBI) and Global Initiative on Sharing All Influenza Data (GISAID) repositories in near-real time.
- To provide a common forum for US public, private, and academic institutions to share protocols, methods, bioinformatics tools, standards, and best practices.
- To establish consistent data and metadata standards, including streamlined repository submission processes, sample prioritization criteria, and a framework for shared, privacy-compliant unique case identifiers.
- To align with other national sequencing and bioinformatics networks, and to support global efforts to advance the use of standards and open data in public health.
Implications for Developing a Vaccine
As the virus continues to mutate and evolve, one question is whether a vaccine developed for one variant will work on others. However, several experts told The Washington Post that the SARS-CoV-2 coronavirus is relatively stable compared to viruses that cause seasonal flu (influenza).
“At this point, the mutation rate of the virus would suggest that the vaccine developed for SARS-CoV-2 would be a single vaccine, rather than a new vaccine every year like the flu vaccine,” Peter Thielen, a molecular biologist at the Johns Hopkins University Applied Physics Laboratory, told the Washington Post.
Nor, he said, is one variant likely to cause worse clinical outcomes than others. “So far, we don’t have any evidence linking a specific virus [strain] to any disease severity score. Right now, disease severity is much more likely to be driven by other factors.”
That point was echoed by Anthony Fauci, MD, Director of the National Institute of Allergy and Infectious Diseases, in a March 22 interview with CBS News. “I have no doubt it’s mutating as all RNA viruses mutate,” he said. However, he added, “we have not seen thus far any type of change in the way it’s acting.”
Fast improvements in gene sequencing technology have made it faster, more accurate, and cheaper to sequence. Thus, as the COVID-19 outbreak happened, there were many clinical laboratories around the world with the equipment, the staff, and the expertise to sequence the novel coronavirus and watch it mutate from generation to generation and from region to region around the globe. This capability has never been available in outbreaks prior to the current SARS-CoV-2 outbreak.
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