Abstract
The emerging knowledge about RNA-based enzymes has already had great impact on our concept of evolutionary history, making the 'RNA world' more likely. It may well have an equally important impact on the diagnostic and therapeutic practices of human and veterinary medicine in the next decade. We are not quite there yet. This review addresses the design and application of hammerhead ribozymes, two aspects of a conserved and most commonly studied and used enzymatically active entity among the RNA enzymes. The emerging picture is one of great diversity. There is at this stage no general cell model nor a clearly preferable ribozyme structure. Each and every cell line (and tissue) may be unique in that they vary with respect to structural requirements for optimal uptake, activity and stability of ribozymes. We may have seen only the tip of the iceberg when it comes to RNA-based enzymes and their roles in biology and medicine.
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