Nescav Syndrome, also known as neurodegeneration and spasticity with or without cerebellar atrophy or cortical visual impairment, is related to spastic paraparesis and hereditary spastic paraplegia, and has symptoms including muscle spasticity An important gene associated with Nescav Syndrome is KIF1A (Kinesin Family Member 1A), and among its related pathways/superpathways is Rett syndrome causing genes. Affiliated tissues include brain, and related phenotypes are nystagmus and flexion contracture