Since then, approximately twenty other genes have been identified to play a role: C9ORF72, mutation of which is observed in over 40% of familial forms, TARDBP, FUS/TLS, etc
[inserm.fr]
In the familial form of ALS several genes mutations have been identified (e.g. SOD1, TDP-43, FUS, and the hexanucleotide repeat expansion in C9ORF72 ) 5.
[radiopaedia.org]
About 10% of the people with ALS have at least one relative with the disease and are said to have have a familial (inherited) form of the disease (FALS).
[rarediseases.info.nih.gov]