AAV-CNGA3, a gene therapy treatment designed to restore cone function, is delivered to the cone receptors at the back of the eye via subretinal injection. It was designed with a synthetic promoter associated with strong gene expression to account for the larger amount of protein needed to restore cone function in achromatopsia (ACHM) patients with a CNGA3 gene mutation.

MeiraGTx is conducting a Phase 1/2 clinical trial of AAV-CNGA3 in children aged 3-15 years old with ACHM caused by mutations in the CNGA3 gene.

AAV-CNGA3 was granted Orphan Drug designation by the FDA and EMA, as well as Rare Pediatric Disease designation and Fast Track designation by the FDA, for the treatment of ACHM caused by mutations in the CNGA3 gene.