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  • COVID-19

  • Open Access English
    Jacob Machado, Denis; Scott, Rachel; Guirales, Sayal; Janies, Daniel;
    Publisher: Zenodo

    The article "Fundamental evolution of all Orthocoronavirinae including three deadly lineages descendent from Chiroptera-hosted coronaviruses: SARS-CoV, MERS-CoV, and SARS-CoV-2" was written by Denis Jacob Machado, Rachel Scott, Sayal Guirales, and Daniel A. Janies. The article was published online on April 26, 2021 (Cladistics, DOI: 10.1111/cla.12454). I. SUPPLEMENTARY DIGITAL MATERIAL The supplementary digital material is available at Zenodo, DOI: 10.5281/zenodo.3740770. In all files containing molecular information from GISAID's EpiCoV database, we masked GISAID's data, viz. each nucleotide was replaced by missing data ("?" or "N"), in compliance with that database's policies. Selected terminals The accession numbers of the 2,006 terminals (76 COVID-2019 from GISAID and 1,930 sequences from NCBI's RefSeq and GenBank databases) used in this study are listed in "terminals.csv." Sequence metadata (with different tabs that contain notes on terminal names and host information) is in "metadata.xlsx." All sequences here are unique, and no sequence is a substring of another complete genome on the database. Also, selected sequences are longer than 26 Kbp and have less than 0.1% of character states that are different from A, C, T, or G (e.g., missing data and gaps). Finally, we were able to predict the partitions ORF1ab, M, S, and N for all sequences herein. Data matrix The final DNA matrix in "" comprises 38,274 characters divided into four partitions, representing the genes ORF1ab (translated by ribosomal frameshifting), S (spike glycoprotein trimer), M (membrane protein), and N (nucleoprotein). The same matrix is also available in NEXUS format ("matrix.nex"), and the partitions and selected models are descriped in the NEXUS file "partitions.nex." Tree search The template for the script used to perform different tree search replicates on TNT is named "treeSearch.RUN." This script was executed ten times, changing the replicate number accordingly. A total of 100 rounds of tree fusing were executed using all trees found this way (see "fuse.RUN"). Consensus trees were produced with "consensus.RUN." Trees with branch lengths were produced with "branchLength.RUN." Bootstrap calculations were performed with "bootstrap.RUN." The calculation of Goodman-Bremer support values was based on the macro "Bremer.RUN". Recombination analyses The parameters used for whole-genome alignment and recombination detection among the complete genomes of the SARS-CoV-2 reference sequence (RefSeq accession number NC_045512.2), a bat-hosted COV RaTG13 (GISAID accession number EPI_ISL_41402131), a representative of the Pan_SL-CoV_GD clade (GISAID accession number EPI_ISL_410721), and two other bat-hosted SARS-like viruses (GenBank accession numbers MG772933.1 and MG772934.1), as well as the main results, are provided in a single PDF file ("recombination.pdf"). Graphical abstract The graphical abstract below summarizes our main results. See full image in file "graphicalAbstract.pdf". Phylogenetic trees from parsimony analyses The NEXUS file "parsimony.nex" contains the best heuristic results from the parsimony analyses (six trees), the tree with branch lengths, the tree with bootstrap values, the tree with Goodman-Bremer support values, the tree with REP values, and the strict consensus tree. The file also contains a tree with merged data (e.g., node numbers, clade frequencies, branch lengths). Bootstrap values and clade sizes from parsimony analysis Boostrap values among all nodes varied from 0 to 100% (mean = 65.74%, median = 80%, and mode = 100%). Boostrap values on the consensus tree varied from 1 to 100% (mean = 75.17%, median = 90%, and mode = 100%). For scatter plots and histograms showing the variation of boostrap values in relation to clade size, see file "bootstrap.png." Complete consensus tree from parsimony analyses A high-resolution version of the consensus tree from the best six heuristic results from tree search performed under the parsimony criterion is in file "parsimony.pdf" Branch lengths are proportional to the number of transformations and branch colors correspond to bootstrap values (see legend in the figure). Host shifts The spreadsheet in "hosts.csv" contains the minimum and the maximum number of each type of host transformations. The complete consensus tree with the YBYRÁ's categorization of host transformations is available in "hosts.pdf." TreeTime analyses Analyses with TreeTime v0.7.5 (available at following instructions from its documentation (revision f1c83c30, available at We included the results of the following analyses: The spreadsheet in "treetime.csv" contains the main results from TreeTime analysis, including estimated mutation rates and the minimum and maximum estimated dates for the selected virus clades. It also gives each of the virus' earliest publications and their respective DOIs. Finally, this spreadsheet has the details about the earliest genetic sequences submitted to NCBI's databases for each of the virus it lists. Host shift calculation using the "mugration" model: the compressed folder "" contains the GTR model calculations ("GTR.txt"), confidence values per node and state ("confidence.csv"), and the annotated tree data showing all host shifts ("annotated_tree.nex" and "annotated_tree.pdf"). Mutation rates: the compressed folder "" contains details about selected clades, including branch lengths ("clade_data.csv"). It also contains host and collection dates for terminals ("terminal_data.csv") and root-to-tip regression analyses ("root-to-tip-regressions.csv" and "root-to-tip-regressions.pdf") Recombination detection analysis The spreadsheet in "summaryFromRdp5_505terminals.xlsx" contains the results of the recombination detection analysis of a 505 terminals dataset. The results in there were used to test the sensitivity of phylogenetic analysis to the removal of putative recombinant sequences. Maximum likelihood trees The maximum likelihood tree (log-likelihood: -2,240,329.5917) is available in "likelihood.nex." Node labels show the support values formatted as SH-aLRT support and bootstrap values. The branch lengths are proportional to the average number of nucleotide substitutions per nucleotide site. Unconstrained maximum likelihood trees for each partition are in "ml_gene_trees.nex." Subsets for sensitivity analysis The matrices, partition schemes, best heuristic solutions, and strict consensus trees from the datasets of 505 and 315 terminals used to test the sensitivity to putative recombinant genomes are in the NEXUS files "dataset505terminals.nex" and "dataset315terminals.nex", respectively. Phylogenetic analyses of the SARS-CoV-2 related clade The NEXUS file "sarscov2.nex" contains the alignment matrix and partition scheme used in the independent phylogenetic analyses of the SARS-CoV-2 clade. The best heuristic solutions (8,900 steps each) and strict consensus tree from parsimony analyses are available in "sarscov2_parsimony.nex." The maximum likelihood tree (likelihood score equal to -67,779.744) is in "sarscov2_ml.nex." Node labels show the support values formatted as SH-aLRT support and bootstrap values. The branch lengths are proportional to the average number of nucleotide substitutions per nucleotide site. Alignment comparisons in the SARS-CoV-2-related clade The file "sarscov2_aligns.xlsx" contain summary stats of the alignment comparisons between the SARS-CoV-2 reference sequence (NCBI's RefSeq accession number NC_045512.2) and related viruses found in humans, bats, and pangolin hosts. Alignment comparisons of the repeat binding motif of the spike glycoprotein The file "rbm.xlsx" contains details on the comparisons between the receptor-binding motif (RBM) of the spike glycoprotein of SARS-CoV-2 (NCBI's RefSeq accession number NC_045512) and other viruses infecting humans, bats, and pangolins in the SARS-CoV-2-related clade. This Excel spreadsheet has two tabs summarizing data from the amino acid and nucleotide alignments, respectively. II. SUPPLEMENTARY ACKNOWLEDGEMENT TABLE The complete GISAID acknowledgement table is provided in file "acknowledgement.xlsx" (Zenodo, DOI: 10.5281/zenodo.3740770). III. GLOSSARY We compose a glossary, provided in file "glossary.pdf" (Zenodo, DOI: 10.5281/zenodo.3740770), with selected terms and concepts that are in our manuscript or that are crucial to understanding the references we cited. ABSTRACT—The severe acute respiratory syndrome coronavirus (SARS-CoV) emerged in humans in 2002. Despite reports showing Chiroptera as the original animal reservoir of SARS-CoV, many argue that Carnivora-hosted viruses are the most likely origin. The emergence of the Middle East respiratory syndrome coronavirus (MERS-CoV) in 2012 also involves Chiroptera-hosted lineages. However, factors such as the lack of comprehensive phylogenies hamper our understanding of host shifts once MERS-CoV emerged in humans and Artiodactyla. Since 2019, the origin of SARS-CoV-2, causative agent of coronavirus disease 2019 (COVID-19), added to this episodic history of zoonotic transmission events. Here we introduce a phylogenetic analysis of 2,006 unique and complete genomes of different lineages of Orthocoronavirinae. We used gene annotations to align orthologous sequences for total evidence analysis under the parsimony optimality criterion. Deltacoronavirus and Gammacoronavirus were set as outgroups to understand spillovers of Alphacoronavirus and Betacoronavirus among ten orders of animals. We corroborated that Chiroptera-hosted viruses are the sister group of SARS-CoV, SARS-CoV-2, and MERS-related viruses. Other zoonotic events were qualified and quantified to provide a comprehensive picture of the risk of coronaviruses' emergence among humans. Finally, we applied a 250 SARS-CoV-2 genomes dataset to elucidate the phylogenetic relationship between SARS-CoV-2 and Chiroptera-hosted coronaviruses.

  • Open Access
    Rangika Munaweera; Ying S. Hu;
    Publisher: Frontiers Media SA

    We report a molecular-docking and virtual-screening-based identification and characterization of interactions of lead molecules with exoribonuclease (ExoN) enzyme in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). From previously identified DEDDh/DEEDh subfamily nuclease inhibitors, our results revealed strong binding of pontacyl violet 6R (PV6R) at the catalytic active site of ExoN. The binding was found to be stabilized via two hydrogen bonds and hydrophobic interactions. Molecular dynamics simulations further confirmed the stability of PV6R at the active site showing a shift in ligand to reach a more stabilized binding. Using PV6R as the lead molecule, we employed virtual screening to identify potential molecular candidates that form strong interactions at the ExoN active site. Our study paves ways for evaluating the ExoN as a novel drug target for antiviral treatment against SARS-CoV-2.

  • Open Access English
    Ariane J. Brown; John J. Won; Rachel L. Graham; Kenneth H. Dinnon; Amy C. Sims; Joy Y. Feng; Tomas Cihlar; Mark R. Denison; Ralph S. Baric; Timothy P. Sheahan;
    Publisher: The University of North Carolina at Chapel Hill University Libraries
    Project: NIH | Broad-spectrum antiviral ... (5R01AI132178-02), NIH | Screening Core (5U19AI109680-03), NIH | MOLECULAR BIOLOGY OF VIRA... (5T32AI007419-09)

    The genetically diverse Orthocoronavirinae (CoV) family is prone to cross species transmission and disease emergence in both humans and livestock. Viruses similar to known epidemic strains circulating in wild and domestic animals further increase the probability of emergence in the future. Currently, there are no approved therapeutics for any human CoV presenting a clear unmet medical need. Remdesivir (RDV, GS-5734) is a monophosphoramidate prodrug of an adenosine analog with potent activity against an array of RNA virus families including Filoviridae, Paramyxoviridae, Pneumoviridae, and Orthocoronavirinae, through the targeting of the viral RNA dependent RNA polymerase (RdRp). We developed multiple assays to further define the breadth of RDV antiviral activity against the CoV family. Here, we show potent antiviral activity of RDV against endemic human CoVs OC43 (HCoV-OC43) and 229E (HCoV-229E) with submicromolar EC50 values. Of known CoVs, the members of the deltacoronavirus genus have the most divergent RdRp as compared to SARS- and MERS-CoV and both avian and porcine members harbor a native residue in the RdRp that confers resistance in beta-CoVs. Nevertheless, RDV is highly efficacious against porcine deltacoronavirus (PDCoV). These data further extend the known breadth and antiviral activity of RDV to include both contemporary human and highly divergent zoonotic CoV and potentially enhance our ability to fight future emerging CoV. Highlights • In vitro antiviral assays were developed for human CoV OC43 and 229E and the zoonotic PDCoV. • The nucleoside analog RDV inhibited HCoV-OC43 and 229E as well as deltacoronavirus member PDCoV. • RDV has broad-spectrum antiviral activity against CoV and should be evaluated for future emerging CoV.