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Microvirus |
The Microviridae are a family of bacteriophages, including the following genera:
- Genus Microvirus; type species: Enterobacteria phage φX174
- Genus Spiromicrovirus; type species: Spiroplasma phage 4
- Genus Bdellomicrovirus; type species: Bdellovibrio phage MAC1
- Genus Chlamydiamicrovirus; type species: Chlamydia phage 1
Genome and Phylogenetics
Microviridae are icosahedral ssDNA bacteriophages. Virus classification involves naming and placing Viruses into a taxonomic system A DNA virus is a Virus that has DNA as its Genetic material and replicates using a DNA-dependent DNA polymerase. This article is about a biological infectious particle for other uses see Phage (disambiguation. This article is about a biological infectious particle for other uses see Phage (disambiguation. Their genome sizes range from 4. 5-6kb and are circular in their conformation. The genome is housed within a tailless icosahedral virion particle. The microviridae can be defined into three main clades according to genome sizes and these are assigned according to their similarity to known lab based strains – the X174-like clade, G4-like clade and the 3-like clade. A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor The X174-like clade of microviridae have the smallest and least variable genomes (5,386-5,387bp). The G4-like clade varies in genome size from 5,486-5,487bp while the largest genome sized group was the 3-like clade, their genomes ranging in size from 6,061-6259bp. The size variability within the groups mainly occurs as a result of insertions and deletions of the intergenic regions.
References
Roykta, D. R. et al, 2006. Horizontal Gene Transfer and the Evolution of Microvirid Coliphage Genomes. A coliphage is a type of Bacteriophage that infects Escherichia coli. Journal of Bacteriology, 118(3) p1134-1142
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