Thank you for your help. Some of those ways will show up in the news, like the police work or the tomatoes. This strategy can be used when the cell is constantly dividing. One form of genetic immunodeficiency disease is caused by a defective gene in a bone marrow cell and has been cured by this approach. Some cells are not in a state of constant division but the cells can be infected with a virus that has been engineered not to cause disease and also to contain the normal gene.
Cystic fibrosis is a lung disease caused by a mutant gene.
Scientists have placed the normal gene in a disabled virus and infected kids and restored partial normal lung function. Another problem is that the defective gene also causes other organs to function abnormally. There are other strategies that you may be able to read about. DNA has may other uses. Argonne National Laboratory, Division of Educational Programs, Harold Myron, Ph.D., Division Director.