Spastic Paraplegia 91, Autosomal Dominant, with or Without Cerebellar Ataxia, also known as spg91, is related to developmental delay with or without epilepsy. An important gene associated with Spastic Paraplegia 91, Autosomal Dominant, with or Without Cerebellar Ataxia is SPTAN1 (Spectrin Alpha, Non-Erythrocytic 1). Affiliated tissues include brain and eye.