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Does the Ribosome Challenge our Understanding of the RNA World?

Anthony M Poole1, Daniel C Jeffares2, Marc P Hoeppner3

  • 1Biomolecular Interaction Centre & School of Biological Sciences, University of Canterbury, Christchurch, New Zealand. anthony.poole@canterbury.ac.nz.

Journal of Molecular Evolution
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The ribosome

Keywords:
Chemical evolutionDarwinian evolutionPolymer transitionRNA worldRibosomeTranslation

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Area of Science:

  • Origin of life studies
  • Biochemistry
  • Evolutionary biology

Background:

  • The RNA world hypothesis posits an early RNA-based system preceding DNA and proteins.
  • Bowman et al. propose the ribosome's peptidyl transferase centre (PTC) evolved with non-templated peptides via chemical evolution, predating RNA replication.
  • This challenges the RNA world model, suggesting it may not have existed.

Discussion:

  • The authors agree non-templated peptide production is an early chemical process.
  • They question if early protein synthesis could evolve without Darwinian processes.
  • The study argues chemical evolution alone is insufficient for proto-PTC improvement and coevolution.

Key Insights:

  • Darwinian evolution is necessary for the early ribosome's development.
  • Chemical evolution can initiate peptidyl transferase activity but not sustain its complex evolution.
  • Replicative processes, subject to Darwinian evolution, likely contributed to PTC evolution.

Outlook:

  • The findings necessitate a re-evaluation of RNA to protein transition models.
  • Misinterpretations of previous work by Bowman et al. are highlighted.
  • Further research is needed to fully understand the interplay of chemical and Darwinian evolution in early molecular systems.