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|Vesicular stomatitis virus (VSV), the prototypical rhabdovirus|
|Group:||Group V ((-)ssRNA)|
Rhabdoviruses are viruses belonging to the family Rhabdoviridae, which is in the order Mononegavirales. The name is derived from the Greek rhabdos meaning rod referring to the shape of the viral particles. Rhabdoviruses infect a broad range of hosts throughout the animal and plant kingdoms. Animal rhabdoviruses infect insects, fish, and mammals, including humans.
Rhabdoviruses carry their genetic material in the form of negative-sense single-stranded RNA. They typically carry genes for five proteins: large protein (L), glycoprotein (G), nucleoprotein (N), phosphoprotein (P), and matrix protein (M). Rhabdoviruses that infect vertebrates are usually bullet-shaped.
The following genera are included here:
- Genus Cytorhabdovirus; type species: Lettuce necrotic yellows virus
- Genus Dichorhabdovirus; type species: Orchid fleck virus
- Genus Ephemerovirus; type species: Bovine ephemeral fever virus
- Genus Lyssavirus; type species: Rabies virus
- Genus Novirhabdovirus; type species: Infectious hematopoietic necrosis virus
- Genus Nucleorhabdovirus; type species: Potato yellow dwarf virus
- Genus Perhabdovirus; type species: Perch rhabdovirus
- Genus Sigmavirus; type species: Drosophila melanogaster sigmavirus
- Genus Tibrovirus; type species: Tibrogargan virus
- Genus Vesiculovirus; type species: Vesicular stomatitis Indiana virus
In addition to the above, there are a large number of rhabdoviruses (~130) that have not yet been assigned to a genus.
These viruses fall into four groups based on the RNA polymerase gene. The basal clade appears to be the Novirhabdoviruses which infect fish. The Cytorhabdoviruses and the Nucleorhabdoviruses which infect plants are sister clades. The Lyssaviruses form a clade of their own which is more closely related to the land vertebrate and insect clades than to the plant viruses. The remaining viruses form a number of highly branched clades and infect arthropods and land vertebrates.
An analysis of 99 species of animal rhabdoviruses found that they fell into 17 taxonomic groupings, eight - Lyssavirus, Vesiculovirus, Perhabdovirus, Sigmavirus, Ephemerovirus, Tibrovirus, Tupavirus and Sprivivirus - which were previous recognized. The authors proposed seven new taxa on the basis of their findings: Almendravirus, Bahiavirus, Curiovirus, Hapavirus, Ledantevirus, Sawgravirus and Sripuvirus. Seven species did not group with the others suggesting the need for additional taxa.
The Curiovirus are a group of four viruses that were isolated isolated from biting midges (Culicoides), sandflies (Lutzomyia ) and mosquitoes (Coqillettidia and Trichoprosopon) which were captured in the forests of South America and the Caribbean.
A supergroup - Dimarhabdovirus - has been created for the genera Ephemerovirus and Vesiculovirus. A number of other viruses that have not been classified into genera also belong to this taxon. This supergroup contains the genera with species that replicate in both vertebrate and invertebrate hosts and have biological cycles that involve transmission by haematophagous dipterans.
Replication of many rhabdoviruses occurs in the cytoplasm, although several of the plant infecting viruses replicate in the nucleus. In order for replication, both the L and P protein must be expressed to regulate transcription. Transcription results in five monocistronic mRNAs being produced because the intergenic sequences act as both termination and promoter sequences for adjacent genes. During their synthesis the mRNAs are processed to introduce a 5' cap and a 3’ polyadenylated tail to each of the molecules. This structure is homologous to cellular mRNAs and can thus be translated by cellular ribosomes to produce both structural and non-structural proteins.
Genomic replication requires a source of newly synthesized N protein to encapsidate the RNA. This occurs during its synthesis and results in the production of a full length anti-genomic copy. This in turn is used to produce more negative-sense genomic RNA. The viral polymerase is required for this process, but how the polymerase engages in both mRNA synthesis and genomic replication is not well understood.
Replication characteristically occurs in an inclusion body within the cytoplasm, from where they bud through various cytoplasmic membranes and the outer membrane of the cell. This process results in the acquisition of the M + G proteins, responsible for the characteristic bullet- shaped morphology of the virus.
Rhabdoviruses are important pathogens of animals and plants. Rhabdoviruses are transmitted to hosts by arthropods, such as aphids, planthoppers, leafhoppers, black flies, sandflies, and mosquitoes.
In September 2012, researchers writing in the journal PLOS Pathogens described a species of rhabdovirus, called Bas-Congo Virus or BASV, responsible for 4 cases of viral hemorrhagic fever in the Bas-Congo district in 2009. The 2 non-fatal cases occurred in healthcare workers treating the other 2, suggesting the possibility of person-to-person transmission.
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