Any hereditary spastic paraplegia in which the cause of the disease is a mutation in the ATL1 gene. The disease is hereditary spastic paraplegia 3A (MONDO_0008437, a Monarch Disease Ontology entry). Also known as: ATL1 hereditary spastic paraplegia, FSP1, SPG3A, Strümpell disease, autosomal dominant familial spastic paraplegia 1, autosomal dominant spastic paraplegia 3, autosomal dominant spastic paraplegia type 3, hereditary spastic paraplegia caused by mutation in ATL1.