B4GALNT1 and Parkinson disease: Even more noteworthy is the finding that OligoGM1 injection in a sporadic Parkinson’s disease model, the B4galnt1+/- mouse, in which the neuronal GM1 content is decreased due to a reduced expression of B4galnt1 glycosyltransferase, promoted a recovery of both behavioral and biochemical features, reaching healthy conditions [25].