gene therapy

Gene therapy treats disease at its source: instead of managing the symptoms of a broken gene, it tries to fix the instructions themselves. The basic idea is to add a working copy of a gene, switch a harmful one off, or edit a faulty sequence directly inside a patient’s cells.

Getting genetic material into cells usually relies on a delivery vehicle, most often an engineered, harmless virus that carries the therapeutic gene to its target. Some treatments work on cells removed from the body and then returned; newer approaches use genome editing to correct a mutation in place.

It is a genuine frontier, with approved treatments for several once-untreatable conditions — but a realistic one. Challenges include reaching the right tissues, lasting long enough, avoiding immune reactions, and high cost. Most current gene therapy targets the patient’s own body cells, not the inheritable germline, which raises distinct ethical questions.