{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T22:29:48Z","timestamp":1791066588919,"version":"4.1.0"},"reference-count":56,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2009,12,23]],"date-time":"2009-12-23T00:00:00Z","timestamp":1261526400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Annals of Neurology"],"published-print":{"date-parts":[[2010,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To study the effect of apolipoprotein E \u03f54 status on biomarkers of neurodegeneration (atrophy on magnetic resonance imaging [MRI]), neuronal injury (cerebrospinal fluid [CSF] t\u2010tau), and brain A\u03b2 amyloid load (CSF A\u03b2<jats:sub>1\u201342<\/jats:sub>) in cognitively normal subjects (CN), amnestic subjects with mild cognitive impairment (aMCI), and patients with Alzheimer disease (AD).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We included all 399 subjects (109 CN, 192 aMCI, 98 AD) from the Alzheimer's Disease Neuroimaging Initiative study with baseline CSF and MRI scans. Structural Abnormality Index (STAND) scores, which reflect the degree of AD\u2010like anatomic features on MRI, were computed for each subject.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A clear \u03f54 allele dose effect was seen on CSF A\u03b2<jats:sub>1\u201342<\/jats:sub> levels within each clinical group. In addition, the proportion of the variability in A\u03b2<jats:sub>1\u201342<\/jats:sub> levels explained by APOE \u03f54 dose was significantly greater than the proportion of the variability explained by clinical diagnosis. On the other hand, the proportion of the variability in CSF t\u2010tau and MRI atrophy explained by clinical diagnosis was greater than the proportion of the variability explained by APOE \u03f54 dose; however, this effect was only significant for STAND scores.<\/jats:p><\/jats:sec><jats:sec><jats:title>Interpretation<\/jats:title><jats:p>Low CSF A\u03b2<jats:sub>1\u201342<\/jats:sub> (surrogate for A\u03b2 amyloid load) is more closely linked to the presence of APOE \u03f54 than to clinical status. In contrast, MRI atrophy (surrogate for neurodegeneration) is closely linked with cognitive impairment, whereas its association with APOE \u03f54 is weaker. The data in this paper support a model of AD in which CSF A\u03b2<jats:sub>1\u201342<\/jats:sub> is the earliest of the 3 biomarkers examined to become abnormal in both APOE carriers and noncarriers. 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