C9orf72 and amyotrophic lateral sclerosis: In addition to rare loss of function GRN mutations, single-nucleotide polymorphisms (SNPs) in the GRN locus, such as rs5848, rs2269906 and rs850738, have been identified by genome-wide association studies as genetic determinants of other neurologic diseases, including Alzheimer’s disease, limbic-predominant age-related TDP-43 encephalopathy (LATE), amyotrophic lateral-sclerosis (ALS) and FTLD caused by expansion of C9orf72 and Gaucher disease [23].