Chow et al. (2009) reported 5 unrelated patients diagnosed with probable or definite ALS. Two had a family history of the disorder. All had adult onset and showed prominent corticospinal tract findings. Nerve conduction velocity studies were normal, ... Chow et al. (2009) reported 5 unrelated patients diagnosed with probable or definite ALS. Two had a family history of the disorder. All had adult onset and showed prominent corticospinal tract findings. Nerve conduction velocity studies were normal, but EMG studies showed some denervation.
In 5 unrelated patients with amyotrophic lateral sclerosis, Chow et al. (2009) identified heterozygosity for a missense, 2 splice site, and 2 truncating mutations in the FIG4 gene (see, e.g., 609390.0006-609390.0008). The mutations were shown to result in ... In 5 unrelated patients with amyotrophic lateral sclerosis, Chow et al. (2009) identified heterozygosity for a missense, 2 splice site, and 2 truncating mutations in the FIG4 gene (see, e.g., 609390.0006-609390.0008). The mutations were shown to result in complete or highly significant loss of protein function. Five different missense FIG4 mutations were identified in 5 patients with a diagnosis of ALS or adult-onset primary lateral sclerosis (PLSA1; 611637), but these mutations were not clearly shown to be pathogenic.