NCIt definition : Human C9orf72 wild-type allele is located in the vicinity of 9p21.2 and is approximately
27 kb in length. This allele, which encodes guanine nucleotide exchange factor C9orf72
protein, is involved in guanyl-nucleotide exchange activity that mediates cellular
stress responses and regulates autophagy. An expanded GGGGCC hexanucleotide repeat
in the non-coding region of the C9orf72 gene is associated with amyotrophic lateral
sclerosis and frontotemporal dementia.;