Isoleucine codon 65 in exon 4 was targeted with sgRNAs (targeting TGTTTCAGGCTCAGAAATCCNGG and ATAAAATGCTCTTTCAATCCNGG ) and an ssODN (ATGGGGGTCTTTGGTGCTCGGTATGATGTGAACACATTCTCTTTTATAAAATGCTCTTTCCATCCAAGACTTCTGAGCCTGAAACAAAACGAGAGAGAGAGAAAAAAAGATGAATATAAATTTTAAATCT ) using CRISPR/Cas9 technology, resulting in a T-to-G mutation (c.195T>G) that changes it to a methionine codon (p.I65M). This mutation mimics a mutation associated with early-onset or pediatric cataract in humans.