Cognition Research Today is a free monthly online journal that collates and summarizes the latest research about Cognition, including details on psychology, neuroscience, memory, brain theory. | ||||||||
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Apolipoprotein E epsilon4, Alzheimer's disease, and cognitive performance in elderly Mexican Mestizos.Villalpando-Berumen JM, Mejia-Arango S, Aguilar-Salinas CA, Ordonez-Sanchez ML, Gutierrez-Robledo LM Geriatrics Clinic, Instituto Nacional de Ciencias Medicas y Nutricion Salvador Zubiran, Mexico City, Mexico. OBJECTIVES: To determine the relationship between apolipoprotein E (APOE) epsilon4 and Alzheimer's disease (AD) in the Mexican Mestizo population, as well as its effects on the cognitive profile of AD and elderly Mestizos without dementia. DESIGN: Cross-sectional analysis of a cohort study. SETTING: Evaluations were conducted at the geriatrics clinic of an academic medical hospital in Mexico City. PARTICIPANTS: Forty-nine elderly subjects with AD and 141 controls selected from a representative sample of Mexican Mestizos aged 65 to 96 who participated in the Prevalence Survey of Dementia in the Mexico City Elderly Population cohort. MEASUREMENTS: All subjects underwent APOE genotypification and a comprehensive clinical and neuropsychological evaluation. RESULTS: There were no significant differences in epsilon3 and epsilon4 frequencies between the subjects with and without AD and a tendency toward higher epsilon4 and lower epsilon3 allele frequencies in subjects aged 75 and older. No association was found between APOE epsilon4 and the presence of AD. The age-, sex-, and education-adjusted risk for AD associated with at least one epsilon4 allele was 1.01 (95% confidence interval=0.45-2.23). Performance on a long-term visual memory test was significantly worse in APOE epsilon4 carriers than in APOE epsilon3 carriers only in the group with AD. CONCLUSION: APOE epsilon4 did not increase the risk for AD in this Mexican Mestizo elderly urban population sample, although the presence of this allele seems to modify its clinical expression. Published 2 April 2008 in J Am Geriatr Soc, 56(4): 677-82.
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