A comparative immunoblotting and immunohistochemical study of SIRT1, 3, and 5 in the entorhinal cortex and hippocampal subregions and white matter of AD cases grouped according to Braak and Braak stages of neurofibrillary degeneration revealed that the neuronal subcellular redistribution of SIRT1 parallels the decrease in its expression, suggesting stepwise loss of neuroprotection dependent on the neuronal population, and that SIRT1 and 3 decrease in parallel to AD progression, while expression of SIRT5 increases during the progression of AD [71]. The gene discussed is SIRT5; the disease is Alzheimer disease.