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Related Experiment Videos

Widespread siRNA "off-target" transcript silencing mediated by seed region sequence complementarity.

Aimee L Jackson1, Julja Burchard, Janell Schelter

  • 1Rosetta Inpharmatics, LLC, Seattle, WA 98109, USA. aimee_jackson@merck.com

RNA (New York, N.Y.)
|May 10, 2006
PubMed
Summary

Short interfering RNAs (siRNAs) and microRNAs (miRNAs) can unintentionally silence unintended transcripts through seed region complementarity. This off-target gene silencing is widespread and sequence-dependent, impacting protein levels.

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Area of Science:

  • Molecular Biology
  • RNA Interference
  • Gene Regulation

Background:

  • Small interfering RNAs (siRNAs) and microRNAs (miRNAs) are key regulators of gene expression.
  • siRNA-mediated gene silencing can lead to unintended "off-target" effects, mimicking natural miRNA regulation.
  • The mechanisms and prevalence of these off-target effects require further elucidation.

Purpose of the Study:

  • To investigate the prevalence and mechanisms of unintended off-target silencing by siRNAs.
  • To determine the role of sequence complementarity, particularly in the seed region, in off-target effects.
  • To compare off-target silencing induced by siRNAs and short hairpin RNAs (shRNAs).

Main Methods:

  • Transfection of siRNAs and inducible shRNAs into cells.

Related Experiment Videos

  • Analysis of transcript levels using sequencing.
  • Assessment of protein loss corresponding to silenced transcripts.
  • Systematic evaluation of seed region complementarity and mismatches.

    • Main Results:

    • A significant proportion of unintended transcripts silenced by siRNAs exhibited complementarity to the siRNA seed region, often in the 3' UTR.
    • Modifications in the siRNA seed region altered the set of silenced transcripts, confirming sequence-specific interactions.
    • Inducible shRNA demonstrated sequence-mediated, delivery-independent off-target silencing.
    • Off-target silencing resulted in a loss of corresponding proteins and was dose-dependent.

    Conclusions:

    • Off-target transcript silencing by siRNAs and shRNAs is a widespread phenomenon.
    • Short stretches of sequence complementarity to the siRNA/shRNA seed region are critical determinants of unintended gene silencing.
    • These findings highlight the importance of considering off-target effects in RNA-based gene regulation studies.