Two genes are consistently associated with all seven memory scores: neuron navigator 2 (NAV2) and Translocase Of Outer Mitochondrial Membrane 40 Homolog (TOMM40), where TOMM40 is proximal to APOE and has been reported to be associated with the memory impairment (Berbee et al., 2011). This evidence concerns the gene NAV2 and memory impairment.