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. 2021 Feb;102(2):001543.
doi: 10.1099/jgv.0.001543.

ICTV Virus Taxonomy Profile: Pospiviroidae

Francesco Di Serio  1 , Robert A Owens  2 , Shi-Fang Li  3 , Jaroslav Matoušek  4 , Vicente Pallás  5 , John W Randles  6 , Teruo Sano  7 , Jacobus Th J Verhoeven  8 , Georgios Vidalakis  9 , Ricardo Flores  5 , Ictv Report Consortium
Affiliations

ICTV Virus Taxonomy Profile: Pospiviroidae

Francesco Di Serio et al. J Gen Virol. 2021 Feb.

Abstract

Members of the family Pospiviroidae have single-stranded circular RNA genomes that adopt a rod-like or a quasi-rod-like conformation. These genomes contain a central conserved region that is involved in replication in the nucleus through an asymmetric RNA-RNA rolling-circle mechanism. Members of the family Pospiviroidae lack the hammerhead ribozymes that are typical of viroids classified in the family Avsunviroidae. The family Pospiviroidae includes the genera Apscaviroid, Cocadviroid, Coleviroid, Hostuviroid and Pospiviroid, with >25 species. This is a summary of the ICTV Report on the family Pospiviroidae, which is available at ictv.global/report/pospiviroidae.

Keywords: ICTV Report; Pospiviroidae; taxonomy.

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Conflict of interest statement

The authors declare that there are no conflicts of interest.

Figures

Fig. 1.
Fig. 1.
Rod-like structure models for viroids, The positions of the central conserved region (CCR), the terminal conserved region (TCR) and the terminal conserved hairpin (TCH) are indicated by shading. The sequence-specific TCH and TCR elements have never been found together in the same viroid.
Fig. 2.
Fig. 2.
Phylogenetic tree of viroid sequences. Maximum-likelihood analysis was conducted with megax [6]. Nodes are labelled with bootstrap support (1000 replicates) where this was >70%.
See this image and copyright information in PMC

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