Birnaviridae
The Birnaviridae family includes three genera of virus species with double-stranded RNA corresponding to the Partitiviridae family is present in two similar segments. From the nature of these segmentation (bi - RNA), the family name is derived. The viruses of this family have no similarities in the nucleic acid sequence with other Virustaxa. The VP4 protease of Birnaviridae shows homology to an ATP-dependent protease in bacteria and organelles. According to recent studies, there are similarities in the secondary structure of the viral RNA-dependent RNA polymerase ( RdRp ) for the members of the Birnaviridae family and Tetraviradae. These findings lead to the conclusion that the Birnaviridae belong to the evolutionarily oldest viruses.
System
- Family Birnaviridae
- Genus Aquabirnavirus
- Genus Avibirnavirus
- Genus Entomobirnavirus
The family belong to the following species, which could still be assigned to a genus:
- Species - Blotched Snakehead Virus ( BSNV )
- Rotifer species - birnavirus ( RBV )