DNA viruses

subclass of viruses

subviral agent that reproduces in amoeba cells that are already infected by a certain helper virus

virus type

Medusavirus is a genus of nucleocytoplasmic large DNA viruses that is the sole representative of Mamonoviridae (from mamono (), the Japanese word for "monster" in reference to Megaviricetes + -viridae). It was first isolated from a Japanese hot spring in 2019. It notably encodes all five types of histones — H1, H2A, H2B, H3, and H4 — which are involved in DNA packaging in eukaryotes, raising the possibility that they may have been involved in the origin of eukaryotes. The virus can harden amoebae of the species Acanthamoeba castellanii into stone-like cysts, but infection usually causes infect

Genomoviridae is a family of single stranded DNA viruses that mainly infect fungi. The genomes of this family are small (2.2–2.4 kilobases in length). The genomes are circular single-stranded DNA and encode rolling-circle replication initiation proteins (Rep) and unique capsid proteins. In Rep-based phylogenies, genomoviruses form a sister clade to plant viruses of the family Geminiviridae. Ten genera are recognized in this family.

Pleolipoviridae is a family of DNA viruses that infect halophilic archaea..

Portogloboviridae is a family of dsDNA viruses that infect archaea. It is a proposed family of the realm Varidnaviria, but ICTV officially puts it as incertae sedis virus. Viruses in the family are related to Helvetiavirae. The capsid proteins of these viruses and their characteristics are of evolutionary importance for the origin of the other Varidnaviria viruses since they seem to retain primordial characters.