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Evidence for a model ancestral viroid

F Bussière1, D Lafontaine, F Côté

  • 1Département de Biochimie, Faculté de Médecine, Université de Sherbrooke, Québec, Canada.

Nucleic Acids Symposium Series
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Computer analysis suggests the peach latent mosaic viroid (PLMVd) is a "living fossil" from the precellular era. A revised rolling circle replication mechanism requires minimal protein involvement for PLMVd.

Area of Science:

  • Virology
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Viroids and satellite RNAs are small, non-coding RNA pathogens.
  • Their replication involves a rolling circle mechanism with RNA-mediated catalysis.
  • Phylogenetic analysis can reveal evolutionary relationships and origins.

Purpose of the Study:

  • To propose the peach latent mosaic viroid (PLMVd) as a "living fossil" from the precellular world.
  • To revise the mechanism of PLMVd rolling circle replication.
  • To investigate the role of protein involvement in RNA replication.

Main Methods:

  • Phylogenetic tree generation using computer analysis.
  • Biochemical characterization of RNA rolling circle replication.
  • Analysis of self-cleavage and self-ligation processes.

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Main Results:

  • Phylogenetic analysis revealed evolutionary connections between viroids and satellite RNAs.
  • Biochemical data highlighted conserved features in rolling circle replication.
  • A revised replication mechanism for PLMVd was proposed with minimal protein dependence.

Conclusions:

  • PLMVd represents a potential "living fossil" with origins predating cellular life.
  • The revised rolling circle replication mechanism offers insights into early RNA-based life.
  • Minimal protein involvement suggests an RNA-centric origin for replication strategies.