The association between genetic variants in SORL1 and Alzheimer disease in an urban, multiethnic, community-based cohort.
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.


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


METHODS
Northern Manhattan, NY.


METHODS
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%).


METHODS
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.
Lee
Joseph H
JH
Taub Institute on Alzheimer's Disease and the Aging Brain, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.
Cheng
Rong
R
Schupf
Nicole
N
Manly
Jennifer
J
Lantigua
Rafael
R
Stern
Yaakov
Y
Rogaeva
Ekaterina
E
Wakutani
Yosuke
Y
Farrer
Lindsay
L
St George-Hyslop
Peter
P
Mayeux
Richard
R
D001741:Black or African American / Q000235:genetics; D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000208:ethnology / Q000235:genetics* / Q000473:pathology; D016009:Chi-Square Distribution; D015331:Cohort Studies; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006239:Haplotypes; D006630:Hispanic or Latino / Q000235:genetics; D006801:Humans; D026502:LDL-Receptor Related Proteins / Q000235:genetics*; D015810:Linkage Disequilibrium; D008297:Male; D026901:Membrane Transport Proteins / Q000235:genetics*; D009518:New York; D020641:Polymorphism, Single Nucleotide; D014505:Urban Population / Q000706:statistics & numerical data*; D044465:White People / Q000235:genetics
D026502:LDL-Receptor Related Proteins; D026901:Membrane Transport Proteins; C102582:SORL1 protein, human