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Where are G-quadruplexes located in the human transcriptome?

Anaïs Vannutelli1,2, Sarah Belhamiti1,2, Jean-Michel Garant2

  • 1Department of Computer Science, Faculté des sciences, Université de Sherbrooke, QC J1K 2R1, Canada.

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Summary
This summary is machine-generated.

This study computationally identified over 1.1 million potential RNA G-quadruplexes (G4) across the human transcriptome. These G4 structures are prevalent in mRNA UTRs and splicing junctions, and in long non-coding RNAs, impacting gene regulation.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Bioinformatics

Background:

  • RNA G-quadruplexes (G4) are crucial structural motifs in transcriptomes.
  • G4 structures regulate various post-transcriptional mechanisms.
  • Previous studies lacked a comprehensive view of G4 distribution and roles.

Purpose of the Study:

  • To perform the first in-depth computational prediction of potential G4 regions in the complete human transcriptome.
  • To elucidate the distribution and abundance of G4 structures across different RNA types.
  • To provide a foundation for understanding G4's regulatory functions.

Main Methods:

  • Utilized a stringent computational approach based on three prediction scores.
  • Analyzed G4 sequence composition, neighboring sequences, and structural variations.
  • Applied predictions across the entire human transcriptome.

Main Results:

  • Predicted over 1.1 million potential G4 (pG4) regions.
  • Confirmed G4 abundance in 5' and 3' UTRs and splicing junctions of mRNA.
  • Identified G4 in long non-coding RNAs (lncRNAs) for the first time, while noting their absence in most small ncRNAs.

Conclusions:

  • This study presents the most extensive computational map of potential G4 in the human transcriptome.
  • The findings highlight the widespread presence of G4 in key regulatory regions of mRNA and lncRNAs.
  • These results advance the understanding of G4's role in post-transcriptional gene regulation.