GRN and frontotemporal dementia: FTD-related studies demonstrated distinct patterns of neurodegeneration based on genetic mutations (C9orf72, MAPT, GRN), suggesting that genotype-specific atrophy patterns could inform early diagnostic biomarkers.(Sellami, et al. 2018) (Cash et al. 2018) (Shinagawa et al. 2015) (Lee et al. 2014).