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ADAR regulates RNA editing, transcript stability, and gene expression.

Isabel X Wang1, Elizabeth So, James L Devlin

  • 1Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.

Cell Reports
|November 5, 2013
PubMed
Summary
This summary is machine-generated.

Adenosine deaminases acting on RNA (ADARs) modify RNA by converting adenosine to inosine. This study reveals ADARs regulate gene expression and transcript stability in human B cells, impacting thousands of genes.

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Area of Science:

  • Molecular Biology
  • Genomics
  • RNA Biology

Background:

  • Adenosine deaminases acting on RNA (ADARs) are enzymes crucial for RNA editing.
  • ADARs catalyze the conversion of adenosine to inosine, which is recognized as guanosine during translation.
  • The precise roles of ADAR proteins in gene regulation and RNA processing remain incompletely understood.

Purpose of the Study:

  • To investigate the function of ADAR proteins in human B cells.
  • To identify ADAR-mediated RNA editing sites and their impact on gene expression.
  • To elucidate the mechanisms by which ADARs regulate RNA transcripts.

Main Methods:

  • Comparative sequencing of DNA and RNA from human B cells.
  • Experimental validation using siRNA knockdown.
  • RNA and protein immunoprecipitation assays.

Main Results:

  • Discovery of over 60,000 adenosine-to-guanosine (A-to-G) RNA editing sites.
  • Identification of thousands of genes influenced by ADARs, with 90% of targets characterized.
  • Demonstration that ADAR regulates transcript stability and gene expression via interaction with HuR (ELAVL1).

Conclusions:

  • ADAR proteins play a significant role in RNA sequence modification and gene expression regulation in human cells.
  • ADARs cooperate with other RNA-processing proteins, such as HuR, to control transcript fate.
  • These findings expand the known functions of ADARs in cellular RNA metabolism.