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Related Experiment Videos

Effective ribozyme delivery in plant cells

R Perriman1, G Bruening, E S Dennis

  • 1Center for Engineering Plants Resistant Against Pathogens (CEPRAP), University of California, Davis 95616, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 20, 1995
PubMed
Summary

Incorporating hammerhead ribozymes into tyrosine transfer RNA (tRNA(Tyr)) enhanced their in vivo efficacy. This tRNA(Tyr) ribozyme effectively reduced target gene activity, demonstrating its potential for gene regulation.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Therapeutics

Background:

  • Hammerhead ribozymes are catalytic RNA molecules with gene-silencing potential.
  • Optimizing ribozyme delivery and expression is crucial for effective in vivo applications.
  • Tyrosine transfer RNA (tRNA(Tyr)) offers a potential scaffold for ribozyme integration.

Purpose of the Study:

  • To investigate the in vivo efficacy of hammerhead ribozymes integrated into tRNA(Tyr).
  • To compare the performance of tRNA(Tyr)-embedded ribozymes with non-embedded ribozymes and antisense sequences.
  • To assess the role of expression levels and ribozyme/substrate ratios in catalytic activity.

Main Methods:

  • Construction and expression of tRNA(Tyr)-hammerhead ribozymes and non-embedded ribozymes using a viral vector.

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  • In vitro and in vivo assays measuring target RNA cleavage and gene activity (chloramphenicol acetyltransferase - CAT).
  • Analysis of mRNA levels and cleavage products to confirm ribozyme activity.

    • Main Results:

    • In vitro, non-embedded ribozymes showed higher target cleavage than tRNA(Tyr) ribozymes.
    • In vivo, tRNA(Tyr) ribozymes significantly reduced CAT activity (<20% of control), outperforming non-embedded ribozymes and antisense sequences.
    • Evidence of specific mRNA cleavage in vivo confirmed the functionality of the tRNA(Tyr) ribozyme.

    Conclusions:

    • Integration into tRNA(Tyr) significantly enhances ribozyme activity in vivo.
    • High expression levels driven by the RNA polymerase III promoter contribute to ribozyme efficiency.
    • tRNA(Tyr)-embedded hammerhead ribozymes represent a promising strategy for targeted gene silencing.