CRISPR/Cas9 technology generated a GA to AC change at position 1760-1761 (c.1760_1761delinsAC) resulting in an arginine to histidine substitution at amino acid 516 (p.R516H). In addition, a synonymous c.1764G>C mutation was generated to create a TaqI restriction enzyme site. Western blot analysis indicates a 60% decrease in protein in homozygotes. This is a missense mutation identified in individuals with Leber congenital amaurosis.