![]() ![]() Some types of virus, such as retroviruses, integrate their genetic material (including the new gene) into a chromosome in the human cell. The viruses are modified so they can't cause disease when used in people. Certain viruses are often used as vectors because they can deliver the new gene by infecting the cell. Instead, a carrier called a vector is genetically engineered to deliver the gene. If a mutated gene causes a necessary protein to be faulty or missing, gene therapy may be able to introduce a normal copy of the gene to restore the function of the protein.Ī gene that is inserted directly into a cell usually does not function. ![]() Gene therapy is designed to introduce genetic material into cells to compensate for abnormal genes or to make a beneficial protein.
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