SARS-CoV-2 Infection Biomarkers Reveal an Extended RSAD2 Dependant Metabolic Pathway
Sala, S.; Nitschke, P.; Masuda, R.; Gray, N.; Lawler, N.; Wood, J. M.; Berezhnoy, G.; Bolanos, A.; Boughton, B. A.; Lonati, C.; Roessler, T.; Singh, Y.; Wilson, I. D.; Lodge, S.; Morillon, A.-C.; Loo, R. L.; Hall, D.; Whiley, L.; Evans, G. B.; Grove, T. L.; Almo, S. C.; Harris, L. D.; Holmes, E.; Merle, U.; Trautwein, C.; Nicholson, J. K.; Wist, J.
Show abstract
We present compelling evidence for the existence of an extended innate viperin dependent pathway which provides crucial evidence for an adaptive response to viral agents like SARS-CoV-2. We show the in vivo biosynthesis of a family of endogenous cytosine metabolites with potential antiviral activity. Two dimensional Nuclear magnetic resonance (NMR) spectroscopy revealed a characteristic spin-system motif indicating the presence of an extended panel of urinary metabolites during the acute viral replication phase. Mass spectrometry additionally allowed the characterization and quantification of the most abundant serum metabolites showing potential diagnostic value of the compounds for viral infections. In total, we unveiled ten nucleoside (cytosine and uracil based) analogue structures, eight of which were previously unknown in humans. The molecular structures of the nucleoside analogues and their correlation with an array of serum cytokines, including IFN-2, IFN-{gamma} and IL-10, suggest an association with the viperin enzyme contributing to an endogenous innate immune defence mechanism against viral infection.
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