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Objective To investigate the SOD1 gene mutations in patients with sporadic ALS.Methods In this study, we screened for the SOD1 mutations in 51 patients who had been clinically diagnosed with sporadic amyotrophic lateral sclerosis(SALS) using PCR and direct sequencing.Results A novel SOD1 mutation was identified in a female Chinese patient with ALS.A 47-year-old Chinese woman first noticed mild muscle weakness in both lower extremities, with muscle pain andfasciculation in 2009.