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In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing
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Published on: May 5, 2023

Alu element-mediated gene silencing.

Ling-Ling Chen1, Joshua N DeCerbo, Gordon G Carmichael

  • 1Department of Genetics and Developmental Biology, University of Connecticut Stem Cell Institute, University of Connecticut Health Center, Farmington, CT 06030-3301, USA.

The EMBO Journal
|May 24, 2008
PubMed
Summary
This summary is machine-generated.

Inverted Alu repeats in RNA can silence gene expression by causing A-to-I RNA editing and nuclear retention. This study reveals a novel regulatory role for these abundant primate sequences in human gene regulation.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Epigenetics

Background:

  • Alu elements are abundant SINE retrotransposons in primate genomes.
  • Inverted Alu repeats in RNA can form duplexes, leading to ADAR enzyme hyperediting.
  • Over 333 human genes contain inverted Alu repeats in their 3'-UTRs.

Purpose of the Study:

  • To investigate the regulatory function of inverted Alu repeats in gene expression.
  • To determine the mechanism by which inverted Alus affect mRNA fate.
  • To assess the role of inverted Alus in natural gene contexts.

Main Methods:

  • Utilized EGFP reporter assays to study Alu element function.
  • Analyzed mRNA editing, nuclear retention, and protein interactions.
  • Examined gene regulation in the natural chromosomal context of the Nicolin 1 gene.

Main Results:

  • A pair of inverted Alus in the 3'-UTR of EGFP mRNA strongly repressed EGFP expression.
  • Silencing correlated with A-to-I RNA editing, nuclear retention, and p54(nrb) association.
  • Inverted Alus in the Nicolin 1 gene's 3'-UTR caused nuclear retention of specific mRNA isoforms.

Conclusions:

  • Inverted Alu elements can function as potent gene silencers.
  • RNA editing and nuclear retention are key mechanisms mediating Alu-induced silencing.
  • Alu elements play a novel role in the regulation of human gene expression.