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Related Experiment Videos

RNAi is antagonized by A-->I hyper-editing.

A D Scadden1, C W Smith

  • 1Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1GA, UK.

EMBO Reports
|December 18, 2001
PubMed
Summary
This summary is machine-generated.

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Adenosine to inosine conversion by ADAR2 inhibits RNA interference (RNAi). Increased deamination of double-stranded RNA (dsRNA) progressively blocks siRNA production, explaining RNAi inhibition.

Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • RNA interference (RNAi) and adenosine to inosine (A-to-I) conversion are dsRNA-responsive pathways with potential antiviral functions.
  • RNAi degrades mRNA via siRNAs, while A-to-I editing alters RNA coding and structure.

Purpose of the Study:

  • To investigate the impact of A-to-I RNA editing on the RNAi pathway.
  • To determine if ADAR2-mediated deamination affects dsRNA processing into siRNAs.

Main Methods:

  • Treatment of dsRNA with ADAR2 enzyme to induce A-to-I editing.
  • Analysis of siRNA production and RNAi efficiency in response to edited dsRNA.

Main Results:

  • ADAR2-mediated deamination of dsRNA inhibits RNA interference.

Related Experiment Videos

  • Progressive inhibition of RNAi correlates with increased levels of dsRNA deamination.
  • dsRNA hyper-editing is sufficient to explain the observed inhibition of RNAi.

    • Conclusions:

    • A-to-I RNA editing by ADAR2 antagonizes the RNAi pathway.
    • This interaction suggests a regulatory mechanism where RNA editing can suppress RNAi-mediated antiviral defense.