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DNA Virus Genomes. Most DNA viruses contain a single genome of linear dsDNA. The papovaviruses, comprising the polyoma- and papillomaviruses, however, have circular DNA genomes, about 5.1 and 7.8 kb pairs in size. DsDNA serves as a template both for mRNA and for self-transcription.
6 gru 2017 · The main difference between DNA and RNA viruses is that DNA viruses contain large genomes due to the accurate replication whereas RNA viruses contain small genomes due to the error-prone replication.
RNA viruses have RNA as genetic material, that may be a single-stranded RNA or a double stranded RNA. Viruses may exploit the presence of RNA-dependent RNA polymerases for replication of their genomes or, in retroviruses, with two copies of single strand RNA genomes, reverse transcriptase produces viral DNA which can be integrated into the host ...
18 kwi 2022 · The 1131 human virus species included 433 DNA, 656 RNA and 42 RT viruses according to the Baltimore classification system (Supplementary Table S1). They could be further classified into 54 families of which Picornaviridae was the largest family and contained 314 virus species.
Viral genomes are small; the genome of RNA viruses ranges from 3.5 kilobases (some retroviruses) to 27 kilobases (some reoviruses), and the genome of DNA viruses ranges from 5 kilobases (some parvoviruses) to 280 kilobases (some poxviruses).
Examples of significant RNA viruses include the influenza virus and HIV, whereas notable DNA viruses include herpesviruses and the adenoviruses. Many RNA viruses are associated with acute infections, while DNA viruses often lead to chronic or latent infections.
Figures 31–1 and 31–2 show a classification outline for DNA viruses and RNA viruses, respectively, based on the type of genome, the nature of the nucleocapsid, and whether an envelope is present. Table Graphic Jump Location
