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Updated: May 17, 2025

Use of Alu Element Containing Minigenes to Analyze Circular RNAs
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Inverted Alu repeats in loop-out exon skipping across hominoid evolution.

Danielle Denisko1,2, Jeonghyeon Kim1,3, Jayoung Ku1,4,5

  • 1Division of Genetics and Genomics, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA.

Biorxiv : the Preprint Server for Biology
|March 31, 2025
PubMed
Summary
This summary is machine-generated.

Inverted Alu elements in introns can cause exon skipping by forming RNA stem-loops, influencing gene evolution in humans and primates. This study reveals their prevalence and impact on transcriptomic innovation.

Keywords:
Alternative splicingAluExon skippingHominoid evolutionInverted repeatsTransposable elements

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • RNA splicing diversifies the human genome's functional landscape.
  • Distal intronic sequences' role in RNA splicing is underexplored.
  • Inverted Alu elements may form RNA stem-loops, promoting exon skipping.

Purpose of the Study:

  • To systematically analyze inverted Alu pairs in the human genome.
  • To assess their impact on exon skipping via predicted RNA stem-loop formation.
  • To determine their relevance to hominoid evolution.

Main Methods:

  • Genome-wide analysis of inverted Alu pairs.
  • Prediction of RNA stem-loop formation.
  • Comparative genomic analysis across nine primate species.
  • Experimental validation of exon skipping.

Main Results:

  • Inverted Alu pairs, especially AluY-AluSx1 and AluSz-AluSx, are enriched near skippable exons.
  • Stable stem-loop structures are predicted for these inverted Alu pairs.
  • Hominoid-specific Alu insertions form inverted pairs enriched in skippable exons of ubiquitination pathway genes.
  • Experimental validation confirmed exon skipping mediated by hominoid-specific inverted Alu pairs.

Conclusions:

  • Inverted Alu pairs contribute to genomic innovation at the transcriptomic level.
  • This work highlights a novel mechanism of transposable element-mediated evolution in hominoids.