The neurodegenerative process in Alzheimer’s disease (AD) is considered the consequence of the deposition of misfolded amyloid-β (Aβ) and hyperphosphorylated tau (p-tau) proteins, with histopathological hallmarks that include Aβ-rich extracellular plaques, p-tau-rich neurofibrillary tangles, microgliosis, astrogliosis, and neuronal loss. This evidence concerns the gene MAPT and early-onset autosomal dominant Alzheimer disease.