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Prevention of Photoreceptor Cell Loss in a Cln6 nclf Mouse Model of Batten Disease Requires CLN6 Gene Transfer to Bipolar Cells.
Molecular Therapy 2018 May 3
The neuronal ceroid lipofuscinoses (NCLs) are inherited lysosomal storage disorders characterized by general neurodegeneration and premature death. Sight loss is also a major symptom in NCLs, severely affecting the quality of life of patients, but it is not targeted effectively by brain-directed therapies. Here we set out to explore the therapeutic potential of an ocular gene therapy to treat sight loss in NCL due to a deficiency in the transmembrane protein CLN6. We found that, although Cln6nclf mice presented mainly with photoreceptor degeneration, supplementation of CLN6 in photoreceptors was not beneficial. Because the level of CLN6 is low in photoreceptors but high in bipolar cells (retinal interneurons that are only lost in Cln6-deficient mice at late disease stages), we explored the therapeutic effects of delivering CLN6 to bipolar cells using adeno-associated virus (AAV) serotype 7m8. Bipolar cell-specific expression of CLN6 slowed significantly the loss of photoreceptor function and photoreceptor cells. This study shows that the deficiency of a gene normally expressed in bipolar cells can cause the loss of photoreceptors and that this can be prevented by bipolar cell-directed treatment.
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