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Related Concept Videos

RNA Structure01:19

RNA Structure

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
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Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
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The primordial tRNA acceptor stem code from theoretical minimal RNA ring clusters.

Jacques Demongeot1, Hervé Seligmann2,3

  • 1Faculty of Medicine, Laboratory AGEIS EA 7407, Team Tools for e-Gnosis Medical & Labcom CNRS/UGA/OrangeLabs Telecoms4Health, Université Grenoble Alpes, F-38700, La Tronche, France.

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Minimal RNA rings mimic early life biomolecules and tRNA structure. Their evolution under neutral mutation regimes aligns with the genetic code

Keywords:
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Area of Science:

  • Origin of Life Studies
  • RNA World Hypothesis
  • Molecular Evolution

Background:

  • Theoretical minimal RNA rings (22 nucleotides) were designed to encode amino acids, start/stop codons, and form stem-loop structures.
  • These RNA rings exhibit properties of early biomolecules, including tRNA-like functions, deamination gradients, and replication origins.
  • The design emphasizes coding nonredundancy within overlapping translation frames, reflecting genetic code structure.

Purpose of the Study:

  • To investigate the evolutionary relationships and diversification models of designed RNA rings.
  • To determine if RNA ring evolution mirrors hypotheses on the early genetic code's development.
  • To assess the influence of different evolutionary models on RNA ring diversification.

Main Methods:

  • Calculated distances between RNA rings using various evolutionary models.
  • Analyzed associations between these distances and genetic code evolutionary hypotheses.
  • Performed pseudo-phylogenetic analyses using substitution matrices from neutrally evolving pseudogenes and functional protein-coding genes.

Main Results:

  • Pseudo-phylogenetic analyses revealed clusters corresponding to the primordial code in tRNA acceptor stems.
  • Substitution matrices from neutrally evolving pseudogenes better reflected these clusters compared to those from selected protein-coding genes.
  • Results indicate that RNA rings with recent cognates evolved from those with earlier cognates.

Conclusions:

  • Designed RNA rings simulate tRNA stem evolution and prebiotic history.
  • The evolution of RNA rings is driven by neutral chemistry-based mutation regimes.
  • The findings support a model where RNA ring diversification is shaped by the genetic code's inherent structure and neutral evolutionary processes.