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Related Experiment Videos

p53 activation by knockdown technologies.

Mara E Robu1, Jon D Larson, Aidas Nasevicius

  • 1University of Minnesota, Minneapolis, Minnesota, United States of America.

Plos Genetics
|May 29, 2007
PubMed
Summary
This summary is machine-generated.

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Morpholino phosphorodiamidate antisense oligonucleotides (MOs) and short interfering RNAs (siRNAs) can cause unintended p53-mediated cell death. Suppressing p53 can reduce these off-target effects without impacting specific gene knockdown outcomes.

Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • Morpholino phosphorodiamidate antisense oligonucleotides (MOs) and short interfering RNAs (siRNAs) are widely used for gene function studies via sequence-specific knockdown.
  • Both MOs and siRNAs can exhibit undesirable off-target effects, complicating experimental results.

Purpose of the Study:

  • To investigate the off-target effects of MOs in zebrafish (Danio rerio) and identify the underlying mechanisms.
  • To determine if p53 activation is a common off-target effect of knockdown technologies.

Main Methods:

  • Utilized zebrafish embryos as a model system, comparing MO-injected animals with known mutants.
  • Assessed off-target effects using TUNEL, acridine orange, and p21 transcriptional assays.
  • Investigated the role of p53 by concurrent knockdown and analyzed p53 isoform transcription via qPCR, microarrays, and in situ hybridization.

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Main Results:

  • Observed indistinguishable off-targeting effects for various MO types, primarily mediated by p53 activation.
  • Demonstrated that p53 knockdown specifically ameliorates MO-induced cell death without affecting intended gene knockdown.
  • Identified diagnostic transcription of a truncated p53 isoform associated with MO off-targeting.

Conclusions:

  • Morpholino off-targeting induces a p53-dependent cell death pathway, a phenomenon also observed with siRNAs.
  • p53 inhibition can mitigate off-target effects of knockdown technologies, potentially applicable across different systems.
  • Understanding and controlling p53-mediated off-target effects is crucial for accurate gene function studies.