C9orf72 and amyotrophic lateral sclerosis: Here, we conducted temporal RNA sequencing (RNA-seq) profiling of human induced pluripotent stem cells (hiPSCs) and induced pluripotent stem cell (iPSC)-derived motor neurons (iMNs) carrying C9orf72, FUS, TARDBP, or SOD1 mutations in both patients with amyotrophic lateral sclerosis (ALS) and healthy individuals.