A novel P66S mutation in exon 3 of the SOD1 gene with early onset and rapid progression.

Amyotrophic lateral sclerosis (ALS) is a fatal motor neuron disease in adults of unknown origin in most cases. Here we report a novel P66S mutation in exon 3 of the SOD1 gene in an apparently sporadic ALS patient with unusual early onset and rapid disease progression. Our data widen the spectrum of SOD1 mutations and clinical presentations of ALS.