To interrogate a poly-T variant (rs10524523, '523) in <i>TOMM40</i>, a gene adjacent to the <i>APOE</i> gene on chromosome 19, in older persons with <i>APOE</i> ε3/3 homozygosity for association with cognitive decline, the clinical hallmark of Alzheimer disease (AD).
The very long (VL) poly-T variant at rs10524523 ("523") of the TOMM40 gene may hasten the onset of late-onset Alzheimer's disease (LOAD) and induce more profound cognitive impairment compared with the short (S) poly-T variant.