This will be a non-randomized, open-label, Phase 1/2 study of the safety and efficacy of AGTC-401 administered to one eye by subretinal injection in individuals with achromatopsia caused by mutations in the CNGB3 gene. The primary study endpoint will be safety and the secondary study endpoint will be efficacy.
Subjects will be enrolled sequentially in seven dosing groups. Subjects in Groups 1, 2, 3, 4, 5, and 6 will be at least 18 years of age and will receive varying dose levels of study agent. Subjects in Group 4a will be 6 to 17 years of age and will receive the same dose as Group 4. Subjects in Groups 5a and 7 will be between 4 and 8 years of age. Subjects in Group 5a will receive the same dose as Group 5, and subjects in Group 7 will receive the maximum tolerated dose identified in Groups 1, 2, 3, 4, 4a, 5, 5a, and 6.
Safety will be monitored by evaluation of ocular and non-ocular adverse events and hematology and clinical chemistry parameters. Efficacy parameters will include visual acuity, light discomfort testing, color vision, static visual field, ERG, adaptive optics retinal imaging, functional MRI (fMRI), color brightness test and OCT.
