Spastic Paraplegia 84, Autosomal Recessive, also known as spg84, is related to spastic paraplegia 86, autosomal recessive and spastic paraplegia 85, autosomal recessive. An important gene associated with Spastic Paraplegia 84, Autosomal Recessive is PI4KA (Phosphatidylinositol 4-Kinase Alpha), and among its related pathways/superpathways are Integrated breast cancer pathway and Ectoderm differentiation. Affiliated tissues include spinal cord, and related phenotypes are hyperreflexia and hypertonia