Gene therapy specialist Meiragtx Holdings plc is heading for its first marketing approval following the successful treatment of 11 children with Leber amaurosis, a severe form of congenital retinal dystrophy that rendered them blind at birth. The 11 children, aged between 1 and 4 years old, all gained visual acuity following a single delivery of a correct version of the AIPL1 (aryl-hydrocarbon interacting protein-like1) gene, which codes for a photoreceptor protein in the cones and rods.