Gene-based therapies
The treatment of most genetic disorders is based on conventional therapeutic approaches.
Gene therapy is an umbrella term for a number of techniques aimed at treating or preventing genetic disease.
The mechanisms of gene-based therapies include:
· replacing the mutated copy of a gene with a functional copy, restoring protein function.
· inactivating a mutated gene that has impaired function (‘knocking out’)
· introduction of a new gene for the production of a beneficial protein.
There are a variety of types of gene therapy products, including:
1. Plasmid DNA: Circular DNA molecules can be genetically engineered to carry therapeutic genes into human cells.
2. Viral vectors: Viruses have a natural ability to deliver genetic material into cells, and therefore some gene therapy products are derived from viruses. Once viruses have been modified to remove their ability to cause infectious disease, these modified viruses can be used as vectors (vehicles) to carry therapeutic genes into human cells.
3. Bacterial vectors: Bacteria can be modified to prevent them from causing infectious disease and then used as vectors (vehicles) to carry therapeutic genes into human tissues.
4. Human gene editing technology: The goals of gene editing are to disrupt harmful genes or to repair mutated genes.
5. Patient-derived cellular gene therapy products: Cells are removed from the patient, genetically modified (often using a viral vector) and then returned to the patient.
