FUS and frontotemporal dementia: The pathology of FTD, termed frontotemporal lobar degeneration (FTLD), is characterised by three subclasses of aggregated misfolded proteins: phosphorylated transactive response DNA binding protein 43 kDa (FTLD‐TDP), phosphorylated tau (FTLD‐tau) and fused in sarcoma (FTLD‐FUS) [4].