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A link between mRNA turnover and RNA interference in Arabidopsis

S Gazzani1, T Lawrenson, C Woodward

  • 1Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK.

Science (New York, N.Y.)
|November 6, 2004
PubMed

Insights

RNA-dependent RNA polymerase (RdRp) amplifies RNA interference (RNAi) by synthesizing double-stranded RNA (dsRNA). This study reveals that decapped messenger RNA (mRNA) is the substrate for RdRp, initiating RNAi in plants.

Area of Science:

  • Molecular Biology
  • Plant Science
  • Genetics

Background:

  • RNA interference (RNAi) is a conserved biological process involving the degradation of homologous messenger RNA (mRNA) by double-stranded RNA (dsRNA).
  • RNA-dependent RNA polymerase (RdRp) plays a crucial role in initiating or amplifying RNAi in many organisms.
  • The in vivo substrate for dsRNA synthesis by RdRp remains largely unknown.

Purpose of the Study:

  • To investigate the substrate used by RdRp for dsRNA synthesis in the context of transgene silencing in Arabidopsis.
  • To elucidate the role of the ribonuclease XRN4 in RNAi and its relationship with RdRp activity.

Main Methods:

  • Genetic analysis involving mutations in XRN4 and RdRp genes in Arabidopsis.
  • Analysis of transgene mRNA accumulation in wild-type and mutant plants.
  • Investigating the role of mRNA decapping in the RNAi pathway.

Main Results:

  • Mutation of XRN4, a ribonuclease involved in mRNA turnover via decapping and 5'-3' exonucleolysis, led to RdRp-dependent transgene silencing.
  • In plants mutated for both XRN4 and RdRp, decapped transgene mRNA accumulated significantly.
  • This accumulation suggests that decapped mRNA is a substrate for RdRp.

Conclusions:

  • Decapped mRNA, lacking its 5' cap structure, becomes accessible to RdRp.
  • This accessibility allows RdRp to synthesize dsRNA, thereby initiating or maintaining the RNAi pathway.
  • The findings provide a novel mechanistic insight into the initiation of RNAi by linking mRNA decay pathways to dsRNA synthesis.

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