Using crRNA and tracrRNA (targeting GTCATTAGTAAATTTCGCAC) and an ssODN template (TTCTTCTCCTAATTAGAAGATCTGAATGTGTTTAGCATCACAAAATTTAATTTATTAAAAATGTTTCCACAGACTGAACAAAAAGAAGTCATTAGTAAATTTCACACTGGCGAAATAAATCTGCTTATCGCTACGACGGTGGCAGAGGAAGGCCTGGATATCAAAGAGTGCAATATTGTTATTCGTTATGGCCTTGTC) with CRISPR/Cas9 technology, arginine codon 779 (CGC) was changed to histidine (CAC) (c.2336G>A, p.R779H). This mutation mimics one found in Aicardi-Goutieres Syndrome (AGS) patients. (J:324284)