What do you guys know about Gene Therapy?

Answer 1

Any virus with the ability to insert its own DNA into a cell's genome may potentially be used for gene therapy. Examples being used currently are retroviruses, adenovirus, and lentivirus. The point of this is that you can use the virus to insert genes that the patient may otherwise be missing, and they can produce proteins and enzymes that they were not able to before.

An actual and very famous example is research in severe combined immune deficiency syndrome (SCIDS), in which the principal disorder is that the patient is missing the blood enzyme adenosine deaminase. They have actually successfully replaced the gene responsible for producing adenosine deaminase (through viral gene therapy), and thus corrected the immune disorder, which was previously untreatable and terminal before this breakthrough.

Answer 2

Viruses inject their DNA into you to trick your cells to make more viruses. Gene therapy is putting helpful DNA inside a virus (or other vector) to get it inside cells, typically to make a working protein that a diseased cell cannot.