Other allelic neurological disorders with the same gene associations are ataxia with oculomotor apraxia (SETX), HSP (ALS2, SPG11, ERLIN1, and DDHD1), JPLS (ALS2), dHMN (SIGMAR1), distal myopathy (GNE), and distal SMA (BICD2). Here, DDHD1 is linked to hereditary spastic paraplegia.