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The  APOE  ɛ4 allele is associated with a risk of Alzheimer’s disease in the elderly, with the association being pronounced in females. Conversely, findings of the effects of the  APOE  ɛ4 allele in young adults are mixed. Here, we investigated the sex–genotype interaction effects of the  APOE  ɛ4 allele on cognitive functions as well as brain structures among 1258 young adults. After adjusting for multiple comparisons, there were significant effects of the interaction between sex and the number of  APOE  ɛ4 allele on some speed tasks (e.g., simple processing speed tasks and the reverse Stroop task) as well as on regional white matter volume (rWMV). The observed sex–genotype interaction conferred better cognitive performance and greater rWMV in the anterior frontal and precentral white matter areas in females having more  APOE  ɛ4 alleles and reduced rWMV in the same areas in male having more  APOE  ɛ4 alleles. These findings support the long-debated antagonistic pleiotropic effects of the  APOE  ɛ4 allele in females.

Sex-Dependent Effects of the APOE ɛ4 Allele on Behavioral Traits and White Matter Structures in Young Adults