Notes on Family: Hypoviridae
This family currently consists of the single genus Hypovirus
. The viruses do not produce virions and cause hypovirulence in their phytopathogenic fungus hosts. They were originally thought to have a dsRNA genome but it is now believed that the dsRNA found in vesicles in infected fungi is a replicative form of the RNA.
There are no virions, although vesicles 50-80nm in diameter containing dsRNA and polymerase activity can be found in infected fungi.
Monopartite, linear, single stranded RNA of about 10-13 kbp. The 3' terminus has a poly(A) tract and the 5' terminus is blocked in some members. Isolates often contain additional shorter length or satellite-like dsRNAs, the function of which are not known.
Genera in the Family
There is currently only one genus: