Secoviridae

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Secoviridae
Virus classification
Group: Group IV ((+)ssRNA)
Order: Picornavirales
Family: Secoviridae
Genera

Subfamily: Comovirinae

Secoviridae is a family of viruses in the order Picornavirales. Plants serve as natural hosts. There are currently 73 species in this family, divided among 11 genera.[1][2]

Structure[edit]

Viruses in Secoviridae are non-enveloped, with icosahedral geometries, and T=pseudo3 symmetry. The diameter is around 25-30 nm. Genomes are linear and segmented, bipartite, around 24-7kb in length.[1]

Genus Structure Symmetry Capsid Genomic Arrangement Genomic Segmentation
Sequivirus Icosahedral Pseudo T=3 Non-Enveloped Linear Monopartite
Sadwavirus Icosahedral Pseudo T=3 Non-Enveloped Linear Segmented
Nepovirus Icosahedral Pseudo T=3 Non-Enveloped Linear Segmented
Fabavirus Icosahedral Pseudo T=3 Non-Enveloped Linear Segmented
Comovirus Icosahedral Pseudo T=3 Non-Enveloped Linear Segmented
Cheravirus Icosahedral Pseudo T=3 Non-Enveloped Linear Segmented
Torradovirus Icosahedral Pseudo T=3 Non-Enveloped Linear Monopartite
Waikavirus Icosahedral Pseudo T=3 Non-Enveloped Linear Monopartite

Life Cycle[edit]

Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. The virus exits the host cell by tubule-guided viral movement. Plants serve as the natural host. Transmission routes are mechanical.[1]

Genus Host Details Tissue Tropism Entry Details Release Details Replication Site Assembly Site Transmission
Sequivirus Plants None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Mechanical inoculation: aphids; Mechanical inoculation: Cavariella aegopodii; Mechanical inoculation: Cavariella pastinacae
Sadwavirus Plants None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Nematodes; mites; thrips
Nepovirus Plants None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Nematodes; mites; thrips
Fabavirus Plants None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Mechanical inoculation: aphids
Comovirus Plants None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Mechanical inoculation: beetles
Cheravirus Plants None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Nematodes; mites; thrips
Torradovirus Plants None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Unknown
Waikavirus Gramineae Phloem; phloem parenchyma; bundle sheath Viral movement Viral movement Cytoplasm Cytoplasm Mechanical innocuation: aphids; mechanical innocuation: leafhoppers

Taxonomy[edit]

Group: ssRNA(+)

[2]

Evolution[edit]

The subfamily Comovirinae evolved ~1,000 years ago with extant species diversifying between 50 and 250 years ago.[3] This time period coincides with the intensification of agricultural practices in industrial societies.

The mutation rate has been estimated to be 9.29×10−3 to 2.74×10−3 subs/site/year.

References[edit]

  1. ^ a b c "Viral Zone". ExPASy. Retrieved 15 June 2015. 
  2. ^ a b ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015. 
  3. ^ Thompson JR, Kamath N, Perry KL (2014) An evolutionary analysis of the secoviridae family of viruses.PLoS One 9(9):e106305. doi: 10.1371/journal.pone.0106305

External links[edit]