Do apolipoprotein E genotype and educational attainment predict the rate of cognitive decline in normal aging? A 12-year follow-up of the Maastricht Aging Study

P.W.M. van Gerven, M.P.J. van Boxtel, E.E.B. Ausems, O. Bekers, J. Jolles

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Abstract

OBJECTIVE: We investigated suspected longitudinal interaction effects of apolipoprotein E (APOE) genotype and educational attainment on cognitive decline in normal aging. METHOD: Our sample consisted of 571 healthy, nondemented adults aged between 49 and 82 years. Linear mixed-models analyses were performed with four measurement time points: baseline, 3-year, 6-year, and 12-year follow-up. Covariates included age at baseline, sex, and self-perceived physical and mental health. Dependent measures were global cognitive functioning (Mini-Mental State Examination; Folstein, Folstein, & McHugh, 1975), Stroop performance (Stroop Color-Word Test; Van der Elst, Van Boxtel, Van Breukelen, & Jolles, 2006a), set-shifting performance (Concept Shifting Test; Van der Elst, Van Boxtel, Van Breukelen, & Jolles, 2006b), cognitive speed (Letter-Digit Substitution Test; Van der Elst, Van Boxtel, Van Breukelen, & Jolles, 2006c), verbal learning (Verbal Learning Test: Sum of five trials; Van der Elst, Van Boxtel, Van Breukelen, & Jolles, 2005), and long-term memory (Verbal Learning Test: Delayed recall). RESULTS: We found only faint evidence that older, high-educated carriers of the APOE-epsilon4 allele (irrespective of zygosity) show a more pronounced decline than younger, low-educated carriers and noncarriers (irrespective of educational attainment). Moreover, this outcome was confined to concept-shifting performance and was especially observable between 6- and 12-year follow-ups. No protective effects of higher education were found on any of the six cognitive measures. CONCLUSIONS: We conclude that the combination of APOE-epsilon4 allele and high educational attainment may be a risk factor for accelerated cognitive decline in older age, as has been reported before, but only to a very limited extent. Moreover, we conclude that, within the cognitive reserve framework, education does not have significant protective power against age-related cognitive decline.
Original languageEnglish
Pages (from-to)459-472
Number of pages14
JournalNeuropsychology
Volume26
Issue number4
DOIs
Publication statusPublished - Jul 2012

Keywords

  • normal aging
  • APOE genotype
  • education
  • cognitive reserve
  • longitudinal design
  • PARTICIPANTS AGED 24-81
  • ALZHEIMERS-DISEASE
  • HEALTH-STATUS
  • POPULATION
  • RESERVE
  • MEMORY
  • SEX
  • ASSOCIATION
  • PERFORMANCE
  • ALLELE

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