Introduction - Gene Regions
The promoter and the coding region are the gene regions that are normally modified. Using special DNA modifying enzymes, geneticists can cut apart the gene regions, remove one of them, and replace it with another that will direct gene expression as desired. The gene is then considered recombinant DNA since it has a new combination of DNA. This part of the genetic engineering process can be very time consuming but also gives the genetic engineer a wide array of gene design options to try.