OGT and cask-related x-linked intellectual disability: Over the past few years, a syndromic form of XLID affecting multiple families has been described which co-segregates with variants in the human OGT gene (Vaidyanathan et al., 2017; Willems et al., 2017; Selvan et al., 2018; Pravata et al., 2019, 2020a, 2020b).