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Published on: August 22, 2012
Public Health
Daniel A Dorfsman1,2, Dingtian Cai1, Kara L Hamilton-Nelson1
1John P. Hussman Institute for Human Genomics, University of Miami Miller School of Medicine, Miami, FL, USA.
Background:
Educational attainment (EA) is a key contributor towards cognitive reserve, providing the brain with a degree of resilience to Alzheimer's disease pathology (ADP). However, research suggests that the influence of education on cognitive reserve varies across racial and ethnic groups and APOE genotype, highlighting the importance of characterizing these effects in diverse populations. This study explores the relationship between EA, APOE ε4 status, and cognitive function in a Puerto Rican (PR) cohort, focusing on individuals exhibiting elevated ADP as indicated by plasma pTau181 levels.
Method:
A subset of 793 PR older adults with elevated (>mean+1SD, n = 124) plasma log(pTau181) was analyzed. Cognitive function was estimated using a composite functional score calculated as the sum of the non-memory items in the Clinical Dementia Rating scale (CDR-FUNC, range=0-12). EA was dichotomized as high (>9 years) and low (≤9 years). Associations between CDR-FUNC, EA, and APOE ε4 carrier status were performed using the Mann-Whitney U test.
Result:
Among individuals with elevated pTau181, those with lower EA exhibited significantly worse cognitive function (p = 6.5×10-4). When stratified by APOE ε4 status, the association between EA and cognitive function was more pronounced among ε4 carriers (p = 1.52×10-3) than non-carriers (p = 0.06). In addition, within the low EA group, APOE ε4 carriers had poorer cognitive function than non-carriers (p = 0.045). However, this difference was not observed in the high EA stratum.
Conclusion:
These results suggest that EA may enhance cognitive reserve and promote resilience to ADP in the PR population. Overall, high EA confers a cognitive advantage against functional decline in the presence of elevated pTau181. Furthermore, carrying the APOE ε4 allele increases the risk of cognitive decline in individuals with low EA compared to those with high EA. These findings underscore the importance of considering both educational background and genetic risk factors in efforts to understand and develop interventions to prevent cognitive decline globally.
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