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Gene Therapy To Treat Blindness

Scientists from the University of Oxford have shown how gene therapy could potentially reverse blindness.

Most causes of untreatable blindness occur from the loss of millions of light-sensitive photoreceptor cells that line the retina. Once a patient’s eyesight has been lost, the remaining cells that are not light-sensitive are still intact. Scientists ejected a gene into the remaining retinal cells of mice, reprogramming them to become light sensitive.

Lead author of the study, Samantha de Silva said: “There are many blind patients in our clinics and the ability to give them some sight back with a relatively simple genetic procedure is very exciting. Our next step will be to start a clinical trial to assess this in patients.”

Gene Therapy To Treat Blindness - Benchmark - Lab Relocations

Gene Therapy To Treat Blindness – Benchmark – Lab Relocations

The mice were monitored for over a year, maintaining their vision during this time, and were able to recognise objects in their environment, indicating a high level of visual perception. The retinal cells that were injected expressed a light-sensitive protein, melanopsin and were able to send visual signals to the brain.

Eyesight diseases such as retinitis pigmentosa are inherited and affect around 1 in 4,000 people, causing a slow loss of vision and eventual blindness. Previous work by the researchers revealed that unaffected cells can be stimulated to mimic visual responses and have their vision restored using a small electronic implant.

Robert MacLaren, who led the Researcher at the Nuffield Laboratory of Ophtalmology in Oxford, said: “The effect of retinitis pigmentosa on families with the disease is devastating and we have spent many years working out new ways to slow the loss of sight and to begin restoring it. This new approach is exciting because by using a human protein that is already present in the eye we reduce the chances of causing an immune response.”

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