Onychodystrophy, Osteodystrophy, Impaired Intellectual Development, and Seizures Syndrome, also known as glycosylphosphatidylinositol biosynthesis defect 24, is related to deafness, onychodystrophy, osteodystrophy, impaired intellectual development, and seizures syndrome and ivic syndrome. An important gene associated with Onychodystrophy, Osteodystrophy, Impaired Intellectual Development, and Seizures Syndrome is PIGF (Phosphatidylinositol Glycan Anchor Biosynthesis Class F). Affiliated tissues include eye, and related phenotypes are global developmental delay and intellectual disability, severe