| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| The condition to be investigated is severe early-onset inherited retinal degeneration due to defects in the gene encoding RPE65 |  | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 13.1 |  
| E.1.2 | Level | PT |  
| E.1.2 | Classification code | 10038845 |  
| E.1.2 | Term | Retinal degeneration |  
| E.1.2 | System Organ Class | 10015919 - Eye disorders |  | 
| E.1.3 | Condition being studied is a rare disease | Yes | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| The main objective is to assess the safety and efficacy of a single subretinal administration of tgAAG76 in up to 12 patients with retinal dystrophy due to mutations in RPE65. 
 |  | 
| E.2.2 | Secondary objectives of the trial |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| 1. individuals who have severe early-onset retinal dystrophy 2. individuals who are homozygous or compound heterozygous for a mutation(s) in RPE65
 3. individuals who are able to give informed consent, with or without the guidance of their parent/guardian where appropriate
 4. individuals aged 5 to 30 years
 |  | 
| E.4 | Principal exclusion criteria | 
| 1. individuals who have contraindications for transient immune-suppression (hypertension, diabetes mellitus, tuberculosis, renal impairment, immunocompromise, osteoporosis, gastric ulceration, severe affective disorder) 2. are pregnant or lactating women
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| The primary end point for each subject is defined as any improvement in visual (rod or cone-derived) function, as determined by an array of psychophysical and electrophysiological techniques, that is greater than the test-retest variation for each test. |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | Yes | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | Yes | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | Yes | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | No | 
| E.8.1.1 | Randomised | Information not present in EudraCT | 
| E.8.1.2 | Open | Information not present in EudraCT | 
| E.8.1.3 | Single blind | Information not present in EudraCT | 
| E.8.1.4 | Double blind | Information not present in EudraCT | 
| E.8.1.5 | Parallel group | Information not present in EudraCT | 
| E.8.1.6 | Cross over | Information not present in EudraCT | 
| E.8.1.7 | Other | Information not present in EudraCT | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | Information not present in EudraCT | 
| E.8.2.2 | Placebo | Information not present in EudraCT | 
| E.8.2.3 | Other | Information not present in EudraCT | 
| E.8.3 | The trial involves single site in the Member State concerned | Yes | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 1 | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | Information not present in EudraCT | 
| E.8.7 | Trial has a data monitoring committee | Yes | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial | 
| The trial will end when the last subject completes their final assessment, 3 years after receiving the IMP. |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 4 | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial years | 4 |