Cressdnaviricota Explained

Cressdnaviricota is a phylum of viruses with small, circular single-stranded DNA genomes and encoding rolling circle replication-initiation proteins with the N-terminal HUH endonuclease and C-terminal superfamily 3 helicase domains.^{[1] [2]} While the replication-associated proteins are homologous among viruses within the phylum, the capsid proteins are very diverse and have presumably been acquired from RNA viruses on multiple independent occasions.^{[3] [4] [5] [6]} Nevertheless, all cressdnaviruses for which structural information is available appear to contain the jelly-roll fold.

Taxonomy

The following classes are recognized:

• Arfiviricetes
• Repensiviricetes

Notes and References

1. Krupovic . M . Varsani . A . Kazlauskas . D . Breitbart . M . Delwart . E . Rosario . K . Yutin . N . Wolf . YI . Harrach . B . Zerbini . FM . Dolja . VV . Kuhn . JH . Koonin . EV . Cressdnaviricota: a Virus Phylum Unifying Seven Families of Rep-Encoding Viruses with Single-Stranded, Circular DNA Genomes. . Journal of Virology . 2020 . 94 . 12 . e00582-20 . 10.1128/JVI.00582-20 . 32269128. 7307096 .
2. Web site: Virus Taxonomy: 2019 Release. talk.ictvonline.org. International Committee on Taxonomy of Viruses. 25 April 2020.
3. Kazlauskas . Darius . Dayaram . Anisha . Kraberger . Simona . Goldstien . Sharyn . Varsani . Arvind . Krupovic . Mart . Evolutionary history of ssDNA bacilladnaviruses features horizontal acquisition of the capsid gene from ssRNA nodaviruses . Virology . April 2017 . 504 . 114–121 . 10.1016/j.virol.2017.02.001. 28189969 .
4. Tisza . Michael J . Pastrana . Diana V . Welch . Nicole L . Stewart . Brittany . Peretti . Alberto . Starrett . Gabriel J . Pang . Yuk-Ying S . Krishnamurthy . Siddharth R . Pesavento . Patricia A . McDermott . David H . Murphy . Philip M . Whited . Jessica L . Miller . Bess . Brenchley . Jason . Rosshart . Stephan P . Rehermann . Barbara . Doorbar . John . Ta'ala . Blake A . Pletnikova . Olga . Troncoso . Juan C . Resnick . Susan M . Bolduc . Ben . Sullivan . Matthew B . Varsani . Arvind . Segall . Anca M . Buck . Christopher B . Discovery of several thousand highly diverse circular DNA viruses . eLife . 4 February 2020 . 9 . e51971 . 10.7554/eLife.51971. 32014111 . 7000223 . free .
5. Krupovic . Mart . Networks of evolutionary interactions underlying the polyphyletic origin of ssDNA viruses . Current Opinion in Virology . October 2013 . 3 . 5 . 578–586 . 10.1016/j.coviro.2013.06.010. 23850154 .
6. Munke . Anna . Kimura . Kei . Tomaru . Yuji . Wang . Han . Yoshida . Kazuhiro . Mito . Seiya . Hongo . Yuki . Okamoto . Kenta . Primordial Capsid and Spooled ssDNA Genome Structures Unravel Ancestral Events of Eukaryotic Viruses . mBio . 30 August 2022 . 13 . 4 . e00156–22 . 10.1128/mbio.00156-22. free . 35856561 . 9426455 .