GNAT1 and Alzheimer disease: Three genes, namely GNAT1 (OMIM*610,444), PDE6B (OMIM*163,500), and RHO (OMIM*610,445), are associated with the AD form, two genes of CACNA1F (OMIM*300,071) and NYX (OMIM*300,278) are associated with the XL form, and other 12 genes, including CABP4 (OMIM*608,965), GNAT1 (OMIM*616,389), GUCY2D (OMIM*618,555), GNB3 (OMIM*617,024), GPR179 (OMIM*614,515), GRK1 (OMIM*613,411), GRM6 (OMIM*257,270), LRIT3 (OMIM*615,058), RDH5 (OMIM*601,617), SAG (OMIM*181,031), SLC24A1 (OMIM*613,830) and TRPM1 (OMIM*603,576) are associated with the AR form [5, 6].