ICTV Virus Taxonomy Profile: Bicaudaviridae.

Area of Science:

• Virology
• Archaea biology
• Extremophile research

Background:

• The family Bicaudaviridae encompasses viruses that infect hyperthermophilic archaea.
• Viruses in this family infect archaea belonging to the genus Acidianus.
• The International Committee on Taxonomy of Viruses (ICTV) provides taxonomic reports on viral families.

Purpose of the Study:

• To summarize the ICTV report on the taxonomy of the family Bicaudaviridae.
• To detail the characteristics of viruses within the Bicaudaviridae family.
• To highlight the unique features of Acidianus two-tailed virus.

Main Methods:

• Review of the ICTV Report on Bicaudaviridae taxonomy.
• Analysis of viral genome characteristics.
• Description of viral replication and morphogenesis.

Main Results:

• The Acidianus two-tailed virus has a 62,730 bp circular double-stranded DNA genome.
• Replication can proceed via lytic or lysogenic pathways.
• Virions exhibit unique extracellular morphogenesis, forming spindle-shaped particles that develop two tails.

Conclusions:

• Bicaudaviridae viruses possess distinct spindle-shaped virion morphotypes specific to archaea.
• The unique tail development post-release is a key characteristic of these viruses.
• This summary provides an overview of the current taxonomy and features of Bicaudaviridae.