Tukey post hoc analysis revealed a significant decline of GABRQ/total L5‐ratio in donors with FTLD‐TDP (p = 0.001) and FTLD‐FUS (p < 0.001) compared to controls, but not in FTLD‐tau (p = 0.99) and AD (p = 0.78) (Figure 2G). Here, MAPT is linked to Alzheimer disease.