Abstract
Amyotrophic lateral sclerosis (ALS) is a fatal disorder of motor neuron degeneration with unclear etiology and no effective treatment to date. ALS is, however, increasingly recognized as a multisystem disorder associated with impaired cognition. The overlap between ALS and dementia at clinical, genetic and neuropathologic levels indicates a spectrum of clinical phenotypes that may include features of frontotemporal lobar degeneration (FTLD). Most cases of ALS are sporadic (SALS), but approximately 10% of all ALS cases are familial ALS (FALS). Mutations in the Cu/Zn superoxide dismutase-1 gene (SOD-1) occur in about 20% of FALS cases. Mutations in the TAR DNA-binding protein 43 gene (TARDBP or TDP-43) may occur in 3-4% of FALS cases, and less frequently, in FTLD. Recently, mutations in the fused in sarcoma/translation in liposarcoma gene (FUS/TLS) were identified as causing about 4-5% of FALS, SALS, and FTLD cases, but not SOD-1 ALS cases, indicating a pathogenic role of FUS, together with TDP-43, in possibly all types of ALS, except for SOD-1 linked ALS. TDP-43 and FUS have striking structural and functional similarities, most likely implicating altered RNA processing as a major event in ALS pathogenesis. Thus, TARDBP and FUS/T...Continue Reading
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