WAllan–Herndon–Dudley syndrome
WCongenital distal spinal muscular atrophy
WGLUT1 deficiency
WDentatorubral–pallidoluysian atrophy
WDistal spinal muscular atrophy type 1
WFragile X syndrome
WHereditary motor and sensory neuropathy
WKohlschütter-Tönz syndrome
WMcLeod syndrome
WPontocerebellar hypoplasia
WRoussy–Lévy syndrome
WSpinal muscular atrophy
WSpinal muscular atrophy with lower extremity predominance
WSpinal muscular atrophy with progressive myoclonic epilepsy
WTourette syndrome