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Clemens R. Scherzer, MD; Katrin Offe, MS; Marla Gearing, PhD; Howard D. Rees, PhD; Guofu Fang, MS; Craig J. Heilman, BS; Chica Schaller, PhD; Hideaki Bujo, MD, PhD; Allan I. Levey, MD, PhD; James J. Lah, MD, PhD

Arch Neurol. 2004;61:1200-1205.

Background  Genetic, epidemiologic, and biochemical evidence suggests that apolipoprotein E, low-density lipoprotein receptors, and lipid metabolism play important roles in sporadic Alzheimer disease (AD).

Objective  To identify novel candidate genes associated with sporadic AD.

Design  We performed an unbiased microarray screen for genes differentially expressed in lymphoblasts of patients with sporadic AD and prioritized 1 gene product for further characterization in AD brain.

Setting  Emory University, Atlanta, Ga.

Subjects  Cell lines were used from 14 patients with AD and 9 normal human control subjects.

Results  Six genes were differentially expressed in lymphoblasts of 2 independent groups of patients with probable AD and autopsy-proven AD. We hypothesized that 1 of the genes, termed low-density lipoprotein receptor relative with 11 binding repeats (LR11) (reduced 1.8- and 2.5-fold in AD lymphoblasts vs controls), might be associated with sporadic AD on the basis of its function as neuronal apolipoprotein E receptor. We found dramatic and consistent loss of immunocytochemical staining for LR11 in histologically normal-appearing neurons in AD brains. This reduction of LR11 protein was confirmed by quantitative Western blotting (P = .01).

Conclusions  There is loss of the microarray-derived candidate, LR11, in neurons of AD brains. This study shows that microarray analysis of widely available lymphoblasts derived from patients with AD holds promise as a primary screen for candidate genes associated with AD.

Author Affiliations: Departments of Neurology (Drs Scherzer, Rees, Levey, and Lah and Messrs Fang and Heilman) and Pathology (Dr Gearing), Center for Neurodegenerative Disease (Ms Offe; Drs Gearing, Rees, Levey, and Lah; and Messrs Fang and Heilman), and Graduate Program in Neuroscience (Ms Offe and Dr Levey), Emory University, Atlanta, Ga; Zentrum für Molekulare Neurobiologie, Universität Hamburg, Hamburg, Germany (Dr Schaller); and Department of Genome Research and Clinical Application, Graduate School of Medicine, Chiba University, Chiba, Japan (Dr Bujo). Dr Scherzer is now with the Center for Neurologic Diseases, Harvard Medical School and Brigham and Women’s Hospital, Boston, Mass.

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