ALG1 and Intellectual disability: Other N-glycosylation-related CDGs include ALG1-CDG, which results in intellectual disability, developmental delay, and epilepsy [49]; NGLY1-CDG, which causes intellectual disability and alacrimia [34]; and SRD5A3-CDG, which causes severe developmental disability, skin problems, cerebellar ataxia and ocular anomalies [34, 50].