CHMP2B and mild neurocognitive disorder: Our study identified only one carrier of C9ORF72 expansion, a single carrier of a pathogenic variant in GRN (Additional file 1: Figure S29), and no disease-causing variants in CHMP2B, FUS, or VCP. While the frequency of the identified mutations differs from those reported in European descent cohorts [59, 113], all the identified pathogenic variants in these FTLD-MND associated genes resided on European haplotypes.