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Related Experiment Videos

Endogenously expressed multimeric self-cleaving hammerhead ribozymes ablate mutant collagen in cellulo.

Belinda E Peace1, Jane B Florer, David Witte

  • 1Cincinnati Children's Hospital Research Foundation, ML 7016, Cincinnati, OH 45229-3039, USA. belinda.peace@cchmc.org

Molecular Therapy : the Journal of the American Society of Gene Therapy
|June 21, 2005
PubMed
Summary

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Hammerhead ribozymes effectively target and degrade RNA. Multimeric hammerhead ribozymes (M8Rz547) significantly reduced target RNA and protein, restoring normal collagen phenotype in osteoblasts.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Gene Regulation

Background:

  • Hammerhead ribozymes are catalytic RNA molecules capable of targeted RNA cleavage.
  • Developing tools for precise gene silencing is crucial for understanding gene function and developing therapies.

Observation:

  • A novel vector (pCOLZ) was engineered to express multimeric (M8Rz547) and monomeric (Rz547) hammerhead ribozymes in MC3T3-E1 osteoblasts.
  • Coexpression with a truncated COL1A1 target transcript demonstrated ribozyme activity.
  • The multimeric ribozyme underwent self-cleavage, producing active monomers.

Findings:

  • Cells expressing M8Rz547 showed significantly increased ribozyme expression compared to Rz547.
  • Nearly complete ablation of target COL1A1 transcript and protein was observed with M8Rz547.

Related Experiment Videos

  • Rz547 expression resulted in a modest reduction of target transcript and protein.

    • Implications:

    • The multimeric hammerhead ribozyme (M8Rz547) effectively silences gene expression at the RNA level.
    • Restoration of a normal collagen phenotype, including increased fibril diameter and reduced turnover, was observed in cells expressing M8Rz547.
    • These findings highlight the potential of engineered hammerhead ribozymes for therapeutic applications targeting specific RNA molecules.