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]


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.


These viruses have been isolated from diatoms of the Chaetoceros genus.[6][1]

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

The virions accumulate in the nucleus.

Mature virions are released by lysis of the host.


  1. 1 2 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". Applied and Environmental Microbiology. 77 (15): 5285–5293. doi:10.1128/AEM.00202-11. PMC 3147440Freely accessible. PMID 21666026.
  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. Kimura, K; Tomaru, Y (2013). "Isolation and Characterization of a Single-Stranded DNA Virus Infecting the Marine Diatom Chaetoceros sp. Strain SS628-11 Isolated from Western JAPAN". PLoS ONE. 8 (12): e82013. doi:10.1371/journal.pone.0082013. PMC 3866115Freely accessible. PMID 24358139.
  5. Tomaru, Yuji; Nagasaki, Keizo (2011). "Diatom Viruses". In Joseph Seckbach and Patrick Kociolek. The Diatom World. Cellular Origin, Life in Extreme Habitats and Astrobiology. 19. Springer. p. 211. doi:10.1007/978-94-007-1327-7_9. 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". Applied and Environmental Microbiology. 71 (7): 3528–3535. doi:10.1128/AEM.71.7.3528-3535.2005. PMC 1169059Freely accessible. PMID 16000758.
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