Safety and efficacy of ATSN-101 in patients with Leber congenital amaurosis caused by biallelic mutations in GUCY2D: a phase 1/2, multicentre, open-label, unilateral dose escalation study

Leber congenital amaurosis type 1 (LCA1) is a rare genetic eye disease that causes severe vision loss or blindness in early childhood. It is caused by changes in a gene called GUCY2D.


In this study, scientists tested a new gene therapy called ATSN-101. They injected it directly under the retina (the light-sensitive layer at the back of the eye) in patients with LCA1. The goal was to see if the treatment was safe and if it could help improve vision.


The trial included patients who received different doses of ATSN-101. Researchers found that the treatment was generally safe. Some patients showed improvements in their vision, such as better ability to see light and improved visual fields.

What this means for Usher syndrome: This study shows that gene therapy like ATSN-101 may be a safe and effective way to treat this type of inherited blindness. Although more research is still needed, these early results are promising and bring hope to people with LCA1 and other inherited eye conditions like Usher syndrome. They could also lead to new treatments for more genetic eye diseases in the future.

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