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Circular code motifs in genomes of eukaryotes.

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  • 1Theoretical bioinformatics, ICube, University of Strasbourg, CNRS, 300 Boulevard Sébastien Brant, 67400 Illkirch, France.

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A specific set of 20 trinucleotides, known as X motifs, preferentially occur in eukaryotic genes, potentially serving as evolutionary relics of early translation systems.

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Bijective transformation circular codeCircular codeCircular code motifsGenomes of eukaryotesPermuted circular code

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Area of Science:

  • Genomics
  • Bioinformatics
  • Molecular Biology

Background:

  • A set X of 20 trinucleotides exhibits a higher occurrence in the primary reading frame across various organisms.
  • This set X forms a circular code, enabling X motifs to maintain gene reading frame synchronization.
  • Previous research established the significance of X motifs in gene reading frame maintenance.

Purpose of the Study:

  • To statistically analyze the occurrence and distribution of X motifs in 138 complete eukaryotic genomes.
  • To compare the prevalence of large X motifs against other motif types and random sequences.
  • To investigate the potential evolutionary role of X motifs in non-gene regions.

Main Methods:

  • Statistical analysis of X motif distribution in both coding and non-coding regions of eukaryotic genomes.
  • Identification and characterization of large X motifs based on length and composition.
  • Comparative analysis of X motifs against bijective, permuted, and random motifs.

Main Results:

  • Large X motifs are significantly more prevalent in eukaryotic genomes than other motif types or random sequences.
  • The largest identified X motif in Solanum pennellii spans 155 trinucleotides in a non-gene region.
  • A substantial X motif of 36 trinucleotides was found in a non-gene region of the human genome (chromosome 13).
  • X motifs occur preferentially in genes, with a proportion of approximately 8% in both gene and non-gene regions across 138 eukaryotic genomes.

Conclusions:

  • X motifs are a significant feature of eukaryotic genomes, outperforming other motif types in occurrence.
  • The presence of large X motifs in non-gene regions suggests they may be remnants of ancient translational mechanisms.
  • The preferential occurrence of X motifs in genes aligns with their known role in reading frame maintenance and supports prior research findings.