TBK1 and Alzheimer disease: The loss of function of TBK1variants or functional deficits of TBK1 missense mutations cause a dominant form of ALS, FTD, ALS‐FTD (Freischmidt et al., 2015), and other rare phenotypes such as corticobasal syndrome (CBS; van der Zee et al., 2017) and AD (Verheijen et al., 2018).