Spinal muscular atrophy (SMA) is a neuromuscular disease characterized by degeneration of motor neurons, resulting in progressive muscle atrophy and paralysis. The most common form of SMA is caused by mutations of the SMN gene, that encodes the SMN protein, which regulates snRNP assembly. Four types of SMA are recognized depending on the age of onset and the severity of the disease: type I (Werdning-Hoffman), type II (intermediate), type III (Kugeleberg-Welander) and type IV (adult form). Other forms of spinal muscular atrophy are caused by mutation of other genes, some known and others not yet defined.
An 11 base pair duplication in exon 6 of the SMN gene produces a type I spinal muscular atrophy (SMA) phenotype: further evidence for SMN as the primary SMA-determining gene.
Harms MB, Ori-McKenney KM, Scoto M, Tuck EP, Bell S, Ma D, Masi S, Allred P, Al-Lozi M, Reilly MM, Miller LJ, Jani-Acsadi A, Pestronk A, Shy ME, Muntoni F, Vallee RB, Baloh RH
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Mutations in the tail domain of DYNC1H1 cause dominant spinal muscular atrophy.
Dyment DA, Sell E, Vanstone MR, Smith AC, Garandeau D, Garcia V, Carpentier S, Le Trionnaire E, Sabourdy F, Beaulieu CL, Schwartzentruber JA, McMillan HJ, Majewski J, Bulman DE, Levade T, Boycott KM
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Evidence for clinical, genetic and biochemical variability in spinal muscular atrophy with progressive myoclonic epilepsy.