One of the identified genetic factors underlying neurological disorders, such as amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), involves a significant expansion of GGGGCC (G4C2) repeats within the C9orf72 gene (Brčić and Plavec 2017). This evidence concerns the gene C9orf72 and amyotrophic lateral sclerosis.