Viroids are small single-stranded, circular RNAs that are infectious pathogens. [1][2] Unlike viruses, they have no protein coating. All known viroids are inhabitants of angiosperms (flowering plants), [3] and most cause diseases whose economic importance to humans varies widely. [4] .

2024年6月27日 · Viroids are a group of noncoding subviral RNAs that infect plant hosts. Currently, there are 44 formal viroid species grouped into 2 families, 39 members in Pospiviroidae, and 5 members in Avsunviroidae [1].

Viroids are nucleic acid species of relatively low molecular weight and unique structure that cause several important diseases of cultivated plants. Similar nucleic acid species may be responsible for certain diseases of animals and humans. Viroids are the smallest known agents of …

viroid, an infectious particle smaller than any of the known viruses, an agent of certain plant diseases. The particle consists only of an extremely small circular RNA (ribonucleic acid) molecule, lacking the protein coat of a virus. Viroids appear to be transmitted mechanically from one cell to another through cellular debris.

2024年4月21日 · Viroids consist only of a short strand of circular RNA capable of self-replication. The first viroid discovered was found to cause potato tuber spindle disease, which causes slower sprouting and various deformities in potato plants (see Figure 6.4.1 6.4. 1).

Viroids are small, single-stranded, circular RNAs that can infect plants and cause specific diseases, even though they do not have the ability to code for proteins. They belong to the taxonomic families of Pospiviroidae and Avsunviroidae, which differ in their structural and functional properties.

Viroids are small, circular, and noncoding RNAs that infect plants. They replicate in the nucleus or chloroplast and then traffic from cell to cell and from organ to organ to establish systemic infection. Viroids achieve nearly all of the biological functions by …

2024年2月26日 · During scientific meetings in the 1970s and 1980s, viroids were often discussed at conferences together with other “subviral pathogens”. This term includes what are now called satellite RNAs and prions. Satellite RNAs depend on a helper virus and have linear or, in the case of virusoids, circular RNA genomes.

Viroids consist only of a short strand of circular RNA capable of self-replication. The first viroid discovered was found to cause potato tuber spindle disease, which causes slower sprouting and various deformities in potato plants (see Figure 6.23).

2020年5月1日 · Viroids are targeted by their host RNA silencing defense, generating viroid-derived small RNAs (vd-sRNAs) that are presumed to direct Argonaute (AGO) proteins to inactivate messenger RNAs, thus initiating disease. Here, we review the existing evidence. Viroid-induced symptoms reveal a distinction.