DNA spike-ins enable confident interpretation of SARS-CoV-2 genomic data from amplicon-based sequencing
Lagerborg, K. A.; Normandin, E.; Bauer, M. R.; Adams, G.; Figueroa, K.; Loreth, C.; Gladden-Young, A.; Shaw, B.; Pearlman, L.; Shenoy, E. S.; Hooper, D.; Pierce, V. M.; Zachary, K. C.; Park, D. J.; MacInnis, B. L.; Lemieux, J. E.; Sabeti, P. C.; Reilly, S. K.; Siddle, K. J.
Show abstract
The rapid global spread and continued evolution of SARS-CoV-2 has highlighted an unprecedented need for viral genomic surveillance and clinical viral sequencing. Amplicon-based sequencing methods provide a sensitive, low-cost and rapid approach but suffer a high potential for contamination, which can undermine lab processes and results. This challenge will only increase with expanding global production of sequences by diverse research groups for epidemiological and clinical interpretation. We present an approach which uses synthetic DNA spike-ins (SDSIs) to track samples and detect inter-sample contamination through a sequencing workflow. Applying this approach to the ARTIC Consortiums amplicon design, we define a series of best practices for Illumina-based sequencing and provide a detailed characterization of approaches to increase sensitivity for low-viral load samples incorporating the SDSIs. We demonstrate the utility and efficiency of the SDSI method amidst a real-time investigation of a suspected hospital cluster of SARS-CoV-2 cases.
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