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Gene therapy may be classified into two types by the type of cell it affects: somatic cell and germline gene therapy. In somatic cell gene therapy (SCGT), the therapeutic genes are transferred into any cell other than a gamete , germ cell , gametocyte , or undifferentiated stem cell .
Human germline engineering (HGE) is the process by which the genome of an individual is modified in such a way that the change is heritable. This is achieved by altering the genes of the germ cells, which mature into eggs and sperm.
A germline mutation can also occur due to exogenous factors. Similar to somatic mutations, germline mutations can be caused by exposure to harmful substances, which damage the DNA of germ cells. This damage can then either be repaired perfectly, and no mutations will be present, or repaired imperfectly, resulting in a variety of mutations. [11]
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]
Somatic recombination, as opposed to the genetic recombination that occurs in meiosis, is an alteration of the DNA of a somatic cell that is inherited by its daughter cells. The term is usually reserved for large-scale alterations of DNA such as chromosomal translocations and deletions and not applied to point mutations .
The light chain genes possess either a single (Cκ) or four (Cλ) Constant gene segments with numerous V and J gene segments but do not have D gene segments. [3] DNA rearrangement causes one copy of each type of gene segment to go in any given lymphocyte, generating an enormous antibody repertoire; roughly 3×10 11 combinations are possible ...
Gene therapy in patients is typically carried out on somatic cells in order to treat conditions such as some leukaemias and vascular diseases. [28] [29] [30] Human germline gene therapy in contrast is restricted to in vitro experiments in some countries, whilst others prohibited it entirely, including Australia, Canada, Germany and Switzerland ...
In female mice, somatic cells were also found to have a higher mutation frequency than germline cells. [4] It was suggested that elevated levels of DNA repair enzymes play a prominent role in the lower mutation frequency of male and female germline cells, and that enhanced genetic integrity is a fundamental characteristic of germline cells. [ 4 ]
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