Study of Subretinally Injected ATSN-101 Administered in Patients With Leber Congenital Amaurosis Caused by Biallelic Mutations in GUCY2D

Inclusion criteria : * Male or female participant with clinical diagnosis of Leber congenital amaurosis caused by biallelic mutations in the GUCY2D (retinal guanylate cyclase) gene with all of the following: a) Documented mutations in both alleles of the GUCY2D gene per testing in a CLIA-approved laboratory, b) For Cohort 1-3, best corrected visual acuity (BCVA) of 20/200 or worse in the eye to be injected; subsequent cohorts may include BCVA of 20/80 or worse in the eye to be injected, c) Photoreceptor (outer nuclear) layer structure identifiable on an optical coherence tomography (OCT) scan across the central retina. * Age ≥18 years for Cohorts 1 through 4, and age ≥ 6 years and \<18 years for Cohort 5. * Male and female participants must follow the contraception requirements of the trial. * Participants must agree to not donate blood, organs, tissues, cells or sperm for at least three months following ATSN-101 administration. Exclusion criteria: * Complicating systemic diseases (such as medical conditions causing immunosuppression) that would preclude the gene transfer, ocular surgery or planned study procedures. * History of human immunodeficiency virus (HIV) infection. * Pre-existing eye conditions in the study eye that would preclude the planned surgery or interfere with the assessment and interpretation of study endpoints: for example, glaucoma or optic neuropathy that has resulted in significant visual loss, corneal or lenticular abnormalities or opacities that would preclude view of the fundus or performance of the outcome measures, uveitis, retinopathy and maculopathy that in the opinion of the Investigator are causing significant visual loss. * Presence of significant ocular abnormalities in the study eye that in the opinion of the Investigator would preclude the planned surgery, effective safety follow-up, or interfere with the interpretation of study endpoints (eg, glaucoma, corneal or significant lens abnormalities or opacities, pre-existing uveitis, intraocular infection, choroidal neovascularization). * Any contraindication to the planned surgical procedure, such as contraindications to the use of anaesthesia or allergy to medications planned in the peri-operative period. * Known allergy or hypersensitivity to any component of the investigational medicinal product (IMP), diagnostic agents used during the study or medications planned for use in the peri-operative period, particularly corticosteroids. * Women who are pregnant (defined as positive beta-Human Chorionic Gonadotropin (HCG) blood or urine test), lactating or breastfeeding. * Any ocular procedure, either planned or performed within 6 months of Day 1, which would interfere with the planned surgery or the interpretation of study endpoints in the opinion of the Principal Investigator (PI). * Laboratory test abnormalities or abnormalities in electrocardiogram that in the opinion of the PI would make the participant unsuitable for participation in the study. * Significant intercurrent illness or infection during the 28 days prior to enrollment. * Current substance use disorder. * Use of any investigational agent administered within 5 times the elimination half-life of that investigational agent prior to ATSN-101 administration. * Enrollment in any other clinical treatment study, for any condition, including those relating to GUCY2D-LCA, throughout the duration of the ATSN-101 study participation. * Use of anticoagulation therapy within two weeks prior to surgery. * Use of immunosuppressive medications. * Current, planned during the course of this trial, or past (within 5 times the elimination half-life of that therapy prior to ATSN-101 administration) use of anti-viral therapy that would inactivate the investigational agent. * Received gene therapy within the last 15 years. The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.