Bacilladnavirus

Bacilladnavirus
Virus classification
Group: Group II (ssDNA)
Order: Unassigned
Family: Unassigned
Genus: Bacilladnavirus
Type species

Chaetoceros salsugineum DNA virus 01

Bacilladnavirus is a genus of single stranded DNA viruses. Species in this genus infect diatoms.[1] The name is derived from the phrase: ssDNA virus infecting Bacillariophytes.[2] Although other single-stranded DNA viruses which infect diatoms have been discovered (Chaetoceros debilis DNA virus (CdebDNAV), C. tenuissimus DNA virus (CtenDNAV), C. lorenzianus DNA virus (ClorDNAV), C. sp. strain TG07-C28 DNA virus (Csp05DNAV), C. setoensis DNA virus (CsetDNAV), and Thalassionema nitzschioides DNA virus (TnitDNAV)), the only species officially classified in this genus is Chaetoceros salsugineum DNA virus 01 (CsalDNAV01.)[2][3][4] It was suggested that the family Bacillariodnaviridae be used to classify these viruses, but this classification has not been officially accepted.[3][5]

Genome

The genome of these viruses appears to be unique. It consists of a single molecule of covalently closed circular single stranded DNA of ~6 kilobases as well as a segment of linear ssDNA of ~1 kilobase. The linear segment is complementary to a portion of the closed circle creating a partially double stranded region.

There are at least three major open reading frames: one of these has a high similarity to replicase related proteins of the other ssDNA viruses.

Virology

These viruses have been isolated from diatoms of the Chaetoceros genus.[6][7]

The virions are ~34 nanometers (nm) in diameter.

The virions accumulate in the nucleus.

Mature virions are released by lysis of the host.

References

  1. ↑ Tomaru Y, Takao Y, Suzuki H, Nagumo T, Koike K, Nagasaki K (2011) Isolation and characterization of a single-stranded DNA virus infecting Chaetoceros lorenzianus Grunow. Appl Environ Microbiol 77(15):5285-5293
  2. 1 2 ICTV proposals 2009.002a-fF et al., Yuji Tomaru, Keizo Nagasaki. Accessed on line Nov. 20, 2015.
  3. 1 2 ICTV Virus Taxonomy 2014, accessed on line Nov. 20, 2015.
  4. ↑ Introduction, "Isolation and characterization of a single-stranded DNA virus infecting the marine diatom Chaetoceros sp. Strain SS628-11 isolated from western Japan", Kei Kimura, Yuji Tomaru, PLoS One, 8, #12 (Dec. 2013), e82013, doi:10.1371/journal.pone.0082013, PMC 3866115.
  5. ↑ Abstract, "Diatom Viruses", Yuji Tomaru, Keizo Nagasaki, doi:10.1007/978-94-007-1327-7_9; chapter in The Diatom World, eds. Joseph Seckbach and Patrick Kociolek, Springer, 2011, ISBN 978-94-007-1326-0
  6. ↑ Nagasaki K, Tomaru Y, Takao Y, Nishida K, Shirai Y, Suzuki H, Nagumo T (2005) Previously unknown virus infects marine diatom. Appl Environ Microbiol 71(7):3528-3535
  7. ↑ Tomaru Y, Shirai Y, Suzuki H, Nagumo T, Nagasaki K (2008) Isolation and characterization of a new single-stranded DNA virus infecting the cosmopolitan marine diatom Chaetoceros dehilis. Aquat Microb Ecol 50(2):103–112
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