MS4A6A and Alzheimer disease: However, it should be noted that recent tests of SNPs in the AD risk genes ABCA7, BIN1, CD2AP, CD33, CLU, CR1, EPHA1, MS4A6A, MS4A6E, and PICALM for associations with the expression of their respective genes in brain tissue from AD and healthy control subjects have been largely negative (38, 39).