A novel de novo mutation in SOD1
Amyotrophic lateral sclerosis (ALS) is a fatal, progressive neurodegenerative disease of motor neurons. Most ALS cases are considered sporadic due to the presence of a  combination of environmental and complex genetic risk factors, while approximately 10% of cases have a family history. Pathogenic variants in the SOD1 gene are the second most frequent causative of genetics-based ALS worldwide, after C9ORF72 hexanucleotide repeat expansion. De novo occurrence of pathogenic mutations in ALS-associated genes and its effect on disease progression has been studied before, especially in the FUS gene. Recent studies have shown that a very small portion of SOD1 cases occurred de novo. Here we present the first de novo case of the SOD1 His47Arg mutation in a young female patient with mild symptoms and a slow progression for seven years now.