Genetic engineering techniques
overview of the techniques of genetic engineering
Genetic engineering techniques allow the modification of animal and plant genomes. Techniques have been devised to insert, delete, and modify DNA at multiple levels, ranging from a specific base pair in a specific gene to entire genes. There are a number of steps that are followed before a genetically modified organism (GMO) is created. Genetic engineers must first choose what gene they wish to insert, modify, or delete. The gene must then be isolated and incorporated, along with other genetic elements, into a suitable vector. This vector is then used to insert the gene into the host genome, creating a transgenic or edited organism.
The ability to genetically engineer organisms is built on years of research and discovery on gene function and manipulation. Important advances included the discovery of restriction enzymes, DNA ligases, and the development of polymerase chain reaction and sequencing.
Added genes are often accompanied by promoter and terminator regions as well as a selectable marker gene. The added gene may itself be modified to make it express more efficiently.
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