GRN and frontotemporal dementia: In many of these cases, FTD is inherited with an autosomal-dominant pattern, and disease-causing mutations have been recognized in several genes (http://www.molgen.ua.ac.be/ADMutations/; https://www.alzforum.org/), among which the microtubule associated protein Tau (MAPT), the progranulin (GRN), and the chromosome 9 open reading frame 72 (C9orf72) genes represent the main key-players of inherited FTD [9,10].