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Ro-associated Y RNAs in metazoans: evolution and diversification.

Jonathan Perreault1, Jean-Pierre Perreault, Gilles Boire

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Y RNAs, small noncoding RNAs bound by Ro60 protein, are conserved across animals. This study reveals new Y RNA genes in insects and nematodes, challenging previous notions about Y5 gene evolution and uncovering a rich history of Y RNA diversification.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • Y genes encode small noncoding RNAs (Y RNAs) with unknown functions, varying numbers across species, and a key characteristic of binding to the Ro60 protein.
  • The evolutionary history and diversity of the Y gene family remain largely unexplored.

Purpose of the Study:

  • To investigate the evolutionary history and conservation of the Y gene family across the animal kingdom.
  • To identify new Y RNA genes and understand their distribution and evolutionary relationships.

Main Methods:

  • Performed homology searches across 27 diverse animal genomes.
  • Conducted structural searches using Y RNA-specific motifs.
  • Analyzed gene organization, synteny, and sequence data, including retropseudogenes.

Main Results:

  • Confirmed Y RNAs are well-conserved throughout the animal kingdom.
  • Discovered novel Y RNA genes, including the first identified in insects and a second in Caenorhabditis elegans.
  • Found Y5 genes are more prevalent than previously thought, suggesting an ancient origin.
  • Identified six putative "fossil" Y genes, primarily Y4 and Y5 related.
  • Inferred ancestral Y RNA sequences and deduced evolutionary pathways for various Y RNA families.
  • Determined consensus sequences and secondary structures for different Y RNA species.
  • Analyzed thousands of Y retropseudogenes to gain further evolutionary insights.

Conclusions:

  • Y RNAs exhibit a rich and diverse evolutionary history.
  • The Y gene family is ancient and has undergone significant diversification across animal lineages.
  • This study provides a comprehensive evolutionary framework for understanding Y RNA genes.