Antiviral Intervention of COVID-19: Linkage of Disease Severity with Genetic Markers FGB (rs1800790), NOS3 (rs2070744) and TMPRSS2 (rs12329760)

The purpose of this study was to investigate polymorphic variants of the genes FGB (rs1800790), NOS3 (rs2070744) and TMPRSS2 (rs12329760) in patients with SARS-CoV-2 and to determine their role in the COVID-19 severity course against the background of antiviral therapy. Real-time polymerase chain reaction (RT-PCR) was used to genotype the polymorphism of the selected genes. GS-5734 (remdesivir) was prescribed as the basic antiviral drug. Binary logistic regression confirmed a low probability of COVID-19 developing in carriers of the A-allele of the FGB gene. The highest probability of moderate and severe COVID-19 clinical forms developing was found in G-allele carriers (especially the GG genotype) of the FGB gene (rs1800790) and the T-allele of the TMPRSS2 gene (rs12329760). Antiviral drug GS-5734 (remdesivir) administration with anti-inflammatory therapy reduces the TMPRSS2 blood level in moderate COVID-19, IL-6 in severe COVID-19 course, and fibrinogen A- and D-dimers in both groups. The proposed treatment does not significantly affect the concentration of endothelin-1, but a decrease in procalcitonin associated with additional antibacterial use was observed, especially in severe COVID-19.