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Gene therapy is a medical technology that aims to produce a therapeutic effect through the manipulation of gene expression or through altering the biological properties of living cells. [ 1 ] [ 2 ] [ 3 ]
The gene to be inserted must be combined with other genetic elements in order for it to work properly. The gene can be modified at this stage for better expression or effectiveness. As well as the gene to be inserted most constructs contain a promoter and terminator region as well as a selectable marker gene.
The success of gene therapy depends on the efficient insertion of therapeutic genes at an appropriate chromosomal target site within the human genome, without causing cell injury, oncogenic mutations, or an immune response. The construction of plasmid vectors is simple and straightforward.
With the discovery of various types of immune-related disorders, there is a need for diversification in prevention and treatment. Developments in the field of gene therapy are being studied to be included in the scope of this treatment, but of course more research is needed to increase the positive results and minimize the negative effects of gene therapy applications. [27]
The ideal gene therapy practice is one that replaces the defective gene with a normal allele at its natural location. This is advantageous over a virally-delivered gene, as there is no need to include the full coding sequences and regulatory sequences when only a small proportion of the gene needs to be altered, as is often the case.
The gene therapy will compete with Australia-based CSL Behring’s Hemgenix, a similar treatment that won FDA approval for hemophilia B in 2022. That drug has a similar list price of $3.5 million ...
Gene therapy seeks to modulate or otherwise affect gene expression via the introduction of a therapeutic transgene. Gene therapy by viral vectors can be performed by in vivo delivery by directly administering the vector to the patient, or ex vivo by extracting cells from the patient, transducing them, and then reintroducing the modified cells ...
In gene therapy a gene that is intended for delivery is packaged into a replication-deficient viral particle to form a viral vector. [29] Viruses used for gene therapy to date include retrovirus, adenovirus, adeno-associated virus and herpes simplex virus. However, there are drawbacks to using viruses to deliver genes into cells.