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A collaboration between scientists in the UK and the USA has shown that gene therapy can give life-long protection to the light-sensitive photoreceptor cells responsible for colour vision in a mouse model of the most common inherited eye disorder.

Prevention of retinal degeneration using CNTF gene therapy applied to one eye of a mouse model of retinitis pigmentosa, which also has fluorescent cones that can be counted. At 8 weeks (PW8) both eyes appear similar, but by 30 weeks retinal pigment changes can be seen in the sham injected eye (c) as the degeneration progresses with all cones lost (d). In contrast, the CNTF treated eye (g, h) has a virtually unchanged fundal appearance and over 50% of cones surviving
Prevention of retinal degeneration using CNTF gene therapy applied to one eye of a mouse model of retinitis pigmentosa, which also has fluorescent cones that can be counted. At 8 weeks (PW8) both eyes appear similar, but by 30 weeks retinal pigment changes can be seen in the sham injected eye (c) as the degeneration progresses with all cones lost (d). In contrast, the CNTF treated eye (g, h) has a virtually unchanged fundal appearance and over 50% of cones surviving

Results published in the journal Molecular Therapy demonstrate that the preserved cells were able to drive visually-guided behaviour, even in later stages of the condition and despite becoming less sensitive to light.

These findings are significant because they open up a new line of research to prevent nerve cell death in retinitis pigmentosa and age-related macular degeneration. They may also have a wider application to neurodegenerative disorders such as amyotrophic lateral sclerosis (ALS).

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