Notes on Family: Megabirnaviridae

icosahedra

Contents

Members of this Family
General Description
Morphology
Genome
Genera in the Family
All Known Sequences
Curated Sequences

General Description

This family of bipartite dsRNA viruses of fungi has a much larger (mega) genome (about 16 kbp) than members of the (vertebrate virus) families Birnaviridae (about 6 kbp) or Picobirnaviridae (about 4 kbp). Other mycoviruses with bipartite ds RNA genomes in the genus Partitivirus have smaller virions and much smaller genomes (usually less than 4 kbp).

Morphology

Virions are isometric (icosahedral) and about 50 nm in diameter.

Genome

Bipartite dsRNA with segments of about 9 and 7 kbp. There are two ORFs predicted on each RNA segment.

Genera in the Family

There is currently only one genus: