C9orf72 and frontotemporal dementia: FTD-causing mutations, including C9orf72, 10 + 16 MAPT, and CHCHD10, have been connected with abnormalities in mitochondrial dynamics (Fatouros et al., 2012; Bannwarth et al., 2014; Onesto et al., 2016; Liu et al., 2020a; Liu et al., 2020b).