Degeneration of the basal forebrain in preclinical, but cognitively normal suspected prodromal AD, is associated with increased microglial inflammation and amyloid and tau accumulation in vivo at the earliest stages of the disease, which suggests that the loss of central cholinergic tone from the basal forebrain may enable microglial inflammation induced by amyloid and tau accumulation [28]. The gene discussed is MAPT; the disease is Alzheimer disease.