C9orf72 and amyotrophic lateral sclerosis: Among those C9orf72 is a well-known genetic mutation of ALS previously detected in both European population (The Alsgen Consortium, 2013; Diekstra et al., 2014; McLaughlin et al., 2015; van Rheenen et al., 2016; Nicolas et al., 2018; Dekker et al., 2019) and East Asian population (Benyamin et al., 2017).