(1) Genus: Marburgvirus
(a) Lake Victoria marburgvirus
(2) Genus: Ebolavirus
(a) Ivory Coast ebolavirus
(b) Reston ebolavirus
(c) Sudan ebolavirus
(d) Zaire virus
19,000 nucleotides long
Nucleotide sequences of 3'-terminus complementary to similar regions on the 5' end
long, filamentous shape (hence "filo")
envelope contains glycoprotein spikes
Filoviruses produce seven proteins, including RNA dependent RNA polymerase (L), nucleocapsid protein (NP), two forms of glycoprotein (GP), four glycosylated viral proteins (VP40, VP35, VP30 and VP24[in Marburg])
Replication takes place in the cytoplasm of host cells when the virion removes its coat and uses its own transcriptase to transcribe its -ssRNA into the complimentary +ssRNA. Regarding transcription, the mRNAs are monocistronic, polyadenylated and uncapped. One genomic and six subgenomic positice sense mRNAs correspond to each of the structural proteins. Eventually, high concentrations of replicated viral genomes begin to appear, marked by the formation of large inclusion bodies with maturation occurring through budding from the plasma membrane.
Filovirus translation may involve Internal Ribosome Entry Sites (IRES), and appears to violate Kozak's rules.