DNA editing partially restores sight

Blind animals have had their vision partially restored using a revolutionary DNA editing technique that scientists say could in future be applied to a range of devastating genetic diseases.

The study shows that a gene editing tool called Crispr can be used to replace faulty genes with working versions in the cells of adults – in this case adult rats.

Previously, the powerful procedure, in which strands of DNA are snipped out and replaced, had been used only in dividing cells but the latest advance paves the way for Crispr to be used to treat a range of incurable illnesses, such as muscular dystrophy, haemophilia and cystic fibrosis, by overwriting faulty genes.

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