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Related Experiment Videos

Viroids: an Ariadne's thread into the RNA labyrinth.

José-Antonio Daròs1, Santiago F Elena, Ricardo Flores

  • 1Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), Universidad Politécnica de Valencia, Avenida de los Naranjos s/n, 46022 Valencia, Spain.

EMBO Reports
|June 3, 2006
PubMed
Summary

Viroids, small RNA molecules, infect plants and cause disease by hijacking host cell machinery. They are valuable models for studying RNA evolution, transport, and the ancient "RNA world."

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Area of Science:

  • Plant pathology
  • Molecular biology
  • Virology

Background:

  • Viroids are distinct from viruses, possessing small, single-stranded, circular RNA genomes without proteins.
  • They infect higher plants, causing diseases, and are classified into two families: Pospiviroidae and Avsunviroidae.

Purpose of the Study:

  • To elucidate the unique replication mechanisms and biological roles of viroids.
  • To highlight viroids as model systems for RNA evolution, transport, and RNA silencing.

Main Methods:

  • Analysis of viroid replication strategies, including RNA polymerization, cleavage, and ligation.
  • Investigation of host-pathogen interactions and the role of RNA silencing.

Main Results:

  • Viroids replicate using host transcriptional machinery (DNA-dependent RNA polymerases) via a rolling-circle mechanism.

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  • Replication occurs in host nuclei (Pospiviroidae) or chloroplasts (Avsunviroidae), with hammerhead ribozymes mediating cleavage in the latter.
  • Viroids exhibit intracellular and intercellular movement, utilizing plasmodesmata and vascular systems for systemic transport.

    • Conclusions:

    • Viroids represent ancient RNA entities, potentially remnants of the RNA world.
    • Their ability to subvert host processes and elicit RNA silencing makes them crucial for understanding fundamental biological mechanisms and plant disease.