In the early 1950s, scientists discovered the double-helix structure of DNA. Since then, scientists have thought about the possibility of artificially modifying DNA to change the functions of the organism. It was first trialed in 1990, when “a four-year-old girl had her white blood cells removed, augmented with the genes that produce an enzyme called adenosine deaminase (ADA), and then reinjected into her body to treat ADA deficiency, a genetic condition that hampers the immune system’s ability to fight disease,” reports Smithsonian Mag.
If we can edit genes, there’s a host of discoveries that will help the future. Furthermore, “the patient’s body began producing the ADA enzyme. But new white blood cells with the corrected gene were not produced, and she had to continue receiving injections.” This is pretty remarkable and opened a ton of new doors for researchers and scientists. They might be able to discover diseases like cancer by modifying the cells and reinjecting them into the body (Smithsonian Mag).