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Related Concept Videos

Subviral Agents01:29

Subviral Agents

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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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Viruses of Archaea01:29

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Archaeal viruses play a crucial role in the ecosystems of extremophilic archaea, particularly those belonging to the phyla Euryarchaeota and Crenarchaeota. By shaping host evolution and facilitating gene transfer, these viruses influence microbial communities and contribute to genetic diversity in extreme environments. The archaea they infect thrive in acidic hot springs and hydrothermal vents characterized by high temperatures and low pH. Archaeal viruses exhibit remarkable structural...
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Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors
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Advances in Viroid-Host Interactions.

Beatriz Navarro1, Ricardo Flores2, Francesco Di Serio1

  • 1Institute for Sustainable Plant Protection, National Research Council of Italy, I-70126 Bari, Italy;

Annual Review of Virology
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PubMed
Summary
This summary is machine-generated.

Viroids are tiny infectious RNAs that infect plants. This review explores their complex interactions with host plants, focusing on recent advances and future research directions in viroid pathogenesis.

Keywords:
RNA silencingRNA structureRNA traffickingcatalytic RNAsnoncoding RNAspathogenesis

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Area of Science:

  • Plant Pathology
  • Molecular Biology
  • Virology

Background:

  • Viroids are the smallest known infectious agents, consisting of short, circular, single-stranded RNA molecules.
  • Unlike viruses, viroids lack protein-coding genes, relying solely on their RNA structure for replication and host interaction.
  • Viroids are classified into two families, Pospiviroidae and Avsunviroidae, with distinct cellular localization (nuclei or chloroplasts).

Purpose of the Study:

  • To review recent advancements in understanding the intricate relationship between viroids and their plant hosts.
  • To highlight key knowledge gaps in viroid biology and pathogenesis.
  • To outline future research perspectives for studying these unique pathogens.

Main Methods:

  • Literature review of recent research on viroid-plant interactions.
  • Analysis of studies on viroid replication, movement, and pathogenicity mechanisms.
  • Synthesis of current understanding of host-pathogen interplay, including RNA silencing.

Main Results:

  • Viroids utilize specific RNA structural elements to interact with host factors.
  • Replication occurs via rolling-circle mechanisms in either the nucleus or chloroplasts.
  • Viroid pathogenesis involves complex interactions with plant defense responses, including RNA silencing.

Conclusions:

  • Viroids serve as valuable models for studying RNA structure-function relationships.
  • Understanding viroid-plant interactions is crucial for developing disease management strategies.
  • Further research is needed to fully elucidate viroid replication, movement, and pathogenicity.