Notes on Family: ds satellite RNAs

no particles of their own

Contents

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

General Description

Satellites are sub-viral agents composed of nucleic acid molecules that depend for their replication on co-infection of a host cell with a specific helper virus. Nucleotide sequences are substantially distinct from those of the genomes of the helper virus and of the host. Replication of the helper virus is often decreased and virus symptoms may be modified.

Satellite nucleic acids consist of those satellites that do not encode their own coat protein (unlike satellite viruses) but are encapsidated in that of the helper virus. Particles containing satellite nucleic acid are therefore antigenically identical to those of the helper virus but can sometimes be distinguished by physical features such as sedimentation rates.

All known double stranded satellite RNAs are associated with mycoviruses and can greatly affect the virulence of the helper virus infection.

Morphology

There are no distinctive virions because they are encapsidated in the coat protein of their helper virus.

Genome

Monopartite, linear, dsRNA of 500-1500bp.

Genera in the Family

There is currently only one subgroup: