Amyotrophic Lateral Sclerosis 20, also known as amyotrophic lateral sclerosis type 20, is related to lateral sclerosis and amyotrophic lateral sclerosis 1. An important gene associated with Amyotrophic Lateral Sclerosis 20 is HNRNPA1 (Heterogeneous Nuclear Ribonucleoprotein A1), and among its related pathways/superpathways is Amyotrophic lateral sclerosis (ALS). Affiliated tissues include spinal cord and brain, and related phenotypes are rimmed vacuoles and muscular dystrophy