Hypomagnesemia, Seizures, and Impaired Intellectual Development 1, also known as homgsmr1, is related to hypomagnesemia, seizures, and impaired intellectual development 2 and visual epilepsy. An important gene associated with Hypomagnesemia, Seizures, and Impaired Intellectual Development 1 is CNNM2 (Cyclin And CBS Domain Divalent Metal Cation Transport Mediator 2). Affiliated tissues include brain, and related phenotypes are intellectual disability and global developmental delay