Archives Express
April 2007

The Association Between Genetic Variants in SORL1 and Alzheimer Disease in an Urban, Multiethnic, Community-Based Cohort

Author Affiliations

Author Affiliations: Taub Institute on Alzheimer's Disease and the Aging Brain (Drs Lee, Cheng, Schupf, Manly, Lantigua, Stern, and Mayeux), Gertrude H. Sergievsky Center (Drs Lee, Cheng, Schupf, Manly, Stern, and Mayeux); Departments of Neurology (Drs Stern and Mayeux), Psychiatry (Drs Stern and Mayeux), and Medicine (Dr Lantigua), College of Physicians and Surgeons, and Department of Epidemiology, School of Public Health (Drs Lee and Mayeux), Columbia University, New York, NY; Centre for Research in Neurodegenerative Diseases, Department of Medicine, University of Toronto, and Toronto Western Hospital Research Institute, Toronto, Ontario (Drs Rogaeva, Wakutani, and St. George-Hyslop); and Departments of Medicine (Genetics Program), Neurology, Genetics and Genomics, Epidemiology, and Biostatistics, Boston University Schools of Medicine and Public Health, Boston, Mass (Dr Farrer).


Copyright 2007 American Medical Association. All Rights Reserved. Applicable FARS/DFARS Restrictions Apply to Government Use.2007

Arch Neurol. 2007;64(4):501-506. doi:10.1001/archneur.64.4.501

Objective  To investigate the association between Alzheimer disease (AD) and variant alleles in SORL1 using a series of single nucleotide polymorphisms (SNPs) in an urban, multiethnic, community-based population.

Design  We used a nested case-control analysis in a population-based, prospective study of aging and dementia in Medicare recipients, 65 years and older.

Setting  Northern Manhattan, NY.

Participants  There were 296 patients with probable AD and 428 healthy, elderly controls. The participants were African American (34%), Caribbean Hispanic (51%), or non-Hispanic white (15%).

Main Outcome Measures  We genotyped all 29 SNPs in SORL1 that were examined in the earlier report. We assessed allelic association with AD using standard case-control methods, which included apolipoprotein E genotype as a covariate.

Results  Several individual SNPs and SNP haplotypes were significantly associated with AD in this prospectively collected community-based cohort, confirming the previously reported positive association of SORL1 with AD. Single nucleotide polymorphism 12, near the 5′ region, was associated with AD in African American and Hispanic individuals. Two SNPs in the 3′ region were also associated with AD in African American (SNP 26) and non-Hispanic white (SNP 20) individuals. A single haplotype in the 3′ region was associated with AD in Hispanic individuals. However, several different haplotypes were associated with AD in African American and white individuals, including the TTC haplotypes at SNPs 23 through 25 (P = .035), which was significantly associated with AD in the North European white individuals in our previous report.

Conclusions  This study confirms the association between genetic variants in SORL1 and AD. While the associations observed in these data sets overlap with those previously reported, the finding of novel SNP and haplotype associations suggests that there may be extensive allelic heterogeneity in SORL1. Broad regions of the SORL1 gene will therefore need to be scrutinized for functional pathogenic variants.