Spastic Paraplegia Type 5a, also known as spastic paraplegia 5a, is related to spastic paraplegia 5a, autosomal recessive and spastic paraplegia 9b, autosomal recessive. An important gene associated with Spastic Paraplegia Type 5a is CYP7B1 (Cytochrome P450 Family 7 Subfamily B Member 1). Affiliated tissues include brain and liver.