Diagnosing SARS-CoV-2 New Variants Lineages
Through genomic surveillance of SARS-CoV-2, multiple new variants of concern (VOC) and variants under investigation (VUI) have arisen independently at multiple locations. Lasted data reveals that, until this moment (April 2021), there are 4 variants of concern and 7 variants under investigation, and all these variants have multiple mutations inside S gene (Spike proteins). These mutations may reduce the efficacy of current RT-qPCR molecular diagnostic tests that target the spike glycoprotein’s gene S of SARS-CoV-2.
How do these mutations affect diagnostic coronavirus RT-PCR assays?
The SARS-CoV-2 RNA transcript encodes the replicase complex ORF1ab, the spike protein (S), viral envelope (E), membrane (M), and the nucleocapsid proteins (N). The deletion 69-70 in the spike protein of the variant of the predominant UK variant called VOC-20DEC-01 (B.1.1.7 lineage) has been reported to cause a negative result using RT-qPCR assays that target the S-gene. Moreover, the South African variant called VOC-20DEC-02 (B.1351 lineage), the Brazilian variant called VUI-21JAN-01 (P.2 lineage) and the India variant VUI-21APR-01 (B1.617 lineage) also have multiple mutations in the spike protein.
Do these mutations affect NZYTech’s diagnostic coronavirus RT-qPCR assays?
The mutations in spike protein described above does not affect NZYTech RT-qPCR assay’s ability to accurately detect SARS-CoV-2. NZYTech SARS-CoV-2 one-step RT-qPCR Kit, were designed to identify SARS-CoV-2 ORF1ab and N genes.
COVID-19 Genomics UK Consortium. COG-UK update on SARS-CoV-2 Spike mutations of special interest: Report 1 (December 19, 2020). https://www.ecdc.europa.eu/sites/default/files/documents/SARS-CoV-2-variant-multiple-spike-protein-mutations-United-Kingdom.pdf
European Center for Disease Prevention and Control (2020) Rapid increase of a SARS-CoV-2 variant with multiple spike protein mutations observed in the United Kingdom. https://www.ecdc.europa.eu/en/publications-data/threat-assessment-brief-rapid-increase-sars-cov-2-variant-united-kingdom
Rambaut, A., et al. (Dec 20, 2020) Preliminary genomic characterisation of an emergent SARS-CoV-2 lineage in the UK defined by a novel set of spike mutations: COVID-19 genomics UK consortium. https://virological.org/t/preliminary-genomic-characterisation-of-an-emergent-sars-cov-2-lineage-in-the-uk-defined-by-a-novel-set-of-spike-mutations/563
The need in the market for reagents used in the detection of covid19 is increasing on a daily basis.
As a primary manufacturer of enzymes and molecular biology tools, NZYTech is here to help to fight COVID-19. Check below the consolidated list of relevant products and contact us to receive a sample if you need them:
Check below the consolidated list of relevant SARS-CoV-2 kits and products:
SARS-CoV-2 RT PCR Test Kits
SARS-CoV-2 One-Step RT-PCR Kit, RdRp and N Genes, CE-IVD
SARS-CoV-2 One-Step RT-PCR Kit, CE-IVD
SARS-CoV-2 One-Step RT-PCR Kit, RUO
Veterinary SARS-CoV-2 One-Step RT-qPCR Kit, RUO
NZYSupreme One-step RT-qPCR Probe Master Mix (2x)
NZYSpeedy One-step RT-qPCR Probe Master Mix (2x)
Lyo NZYSupreme One-step RT-qPCR Probe Master Mix (2x)
Lyo NZYSpeedy One-step RT-qPCR Probe Master Mix (2x)
One-step NZYSpeedy RT-qPCR Probe kit
One-step NZYSpeedy RT-qPCR Probe kit, ROX
One-step NZYSpeedy RT-qPCR Probe kit, ROX Plus