Cerebellar Ataxia, Impaired Intellectual Development, and Dysequilibrium Syndrome 1, also known as dysequilibrium syndrome, is related to cerebellar ataxia, mental retardation and dysequlibrium syndrome and cerebellar hypoplasia, and has symptoms including cerebellar ataxia, action tremor and dysdiadochokinesis. An important gene associated with Cerebellar Ataxia, Impaired Intellectual Development, and Dysequilibrium Syndrome 1 is VLDLR (Very Low Density Lipoprotein Receptor). Affiliated tissues include cerebellum and brain, and related phenotypes are intellectual disability and hyperreflexia