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The complete genome sequence of a novel circovirus (elk circovirus (ElkCV) Banff/2019) was determined via high throughput sequencing of liver tissue from a euthanized Rocky Mountain elk (Cervus canadensis nelsoni) from Alberta, Canada. The genome is circular and 1,787 nucleotides long, with two major ORFs encoding predicted proteins. Comparative genomic analysis to 4,164 publicly available complete and near complete circovirus genomes showed that ElkCV shares approximately 65% pairwise genome-wide nucleotide identity with the most closely related circovirus species, porcine circoviruses (PCV) 1 and 2 and bat-associated circovirus (BatACV) 11. ElkCV features a stem-loop within the origin of replication region characteristic of circoviruses. However, it differs from those found in PCV1, PCV2 and BatACV11 since it has a longer stem and contains hexamer repeats that overlap the stem in opposing orientations. Interestingly, stem-loop structures of similar length featuring repeats in a similar position and orientation are also seen in some avian circoviruses. Based on the demarcation threshold established by the International Committee on Taxonomy of Viruses (ICTV) for members of Circoviridae (80% pairwise genome-wide nucleotide identity), ElkCV represents a novel species and is the first complete circovirus genome reported from a cervid host.
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10.1038/s41598-020-75577-6
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document_parses/pdf_json/a5a1bfc77ef2ae86e8b029d89d6a5d134681558b.json
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document_parses/pmc_json/PMC7659335.xml.json
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Discovery and comparative genomic analysis of elk circovirus (ElkCV), a novel circovirus species and the first reported from a cervid host
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