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Related Experiment Videos

Viroids: molecular infectious agents.

J Smarda1

  • 1Department of Biology, Medical Faculty, J. E. Purkynĕ University, Brno, Czechoslovakia.

Acta Virologica
|November 1, 1987
PubMed
Summary
This summary is machine-generated.

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Viroids are the smallest infectious agents, causing plant diseases by interfering with host cell processes. Their RNA structure and sequence determine virulence, potentially originating from intron transcripts.

Area of Science:

  • Plant Pathology
  • Molecular Biology
  • Virology

Background:

  • Viroids, discovered in 1971, are unique small RNA molecules causing specific plant infectious diseases.
  • They are the smallest and simplest known infectious agents, affecting various crops like potatoes, tomatoes, and citrus.
  • Common symptoms include stunting, leaf distortions, and plant death.

Purpose of the Study:

  • To detail the characteristics of viroids, including their structure, replication, and pathogenic mechanisms.
  • To explore the genetic basis of viroid virulence and their evolutionary origins.
  • To understand how viroids interact with host cellular machinery.

Main Methods:

  • Analysis of viroid RNA sequences and homology between different viroid groups.

Related Experiment Videos

  • Characterization of viroid secondary structure and physical properties.
  • Investigation of viroid replication in host cell nuclei using host RNA polymerase II.
  • Examination of nucleotide sequences related to virulence and host interaction.

    • Main Results:

    • Viroids are single-stranded RNAs (246-371 nucleotides) with extensive base pairing forming rod-like structures.
    • Ten viroid sequences reveal two homology groups, with a conserved central region involved in replication.
    • Replication occurs in nuclei via a rolling circle mechanism using host RNA polymerase II.
    • Virulence is modulated by specific nucleotide sequences, and viroids may interfere with pre-mRNA processing via U1 snRNA complex formation.

    Conclusions:

    • Viroid pathogenicity arises from interference with host pre-mRNA processing.
    • Viroid virulence is genetically determined by specific RNA regions.
    • Viroids likely evolved from circularized eukaryotic intron transcripts.