BACKGROUND: The association between Alzheimer disease (AD) and genotypes at the apolipoprotein E (APOE) locus has been confirmed in numerous populations worldwide, but appears to be inconsistent in African American subjects. OBJECTIVE: To investigate the association between APOE genotypes and AD in elderly African American subjects. DESIGN: Clinic-based, multicenter case-control study and a family study. PARTICIPANTS: A total of 338 African American probands meeting criteria for probable or definite AD, 301 cognitively healthy, elderly unrelated control subjects (spouses and community volunteers), and 108 siblings of 88 AD probands. MAIN OUTCOME MEASURES: Odds of AD according to APOE genotype. RESULTS: Compared with individuals with the APOEepsilon3/epsilon3, the odds of having AD were significantly increased among those with 1 or more copies of the epsilon4 allele; the odds ratio (OR) for the epsilon3/epsilon4 genotype was 2.6 (95% confidence interval [CI], 1.8-3.7), and the OR for the epsilon4/epsilon4 genotype was 10.5 (95% CI, 5.1-21.8). These risks decreased substantially after 68 years of age. The risk for AD was lower among individuals with the epsilon2/epsilon3 genotype (OR, 0.41; 95% CI, 0.22-0.79). The patterns of association were similar in men and women. These results obtained from comparisons of unrelated AD patients and controls were bolstered by results of analysis of family data that showed preferential transmission of the epsilon4 allele to demented siblings (P<<.001) and of the epsilon2 allele to nondemented siblings (P=.005). CONCLUSIONS: The presence of 1 or 2 epsilon4 alleles is a determinant of AD risk in African American subjects. The age-related risk for decline associated with the epsilon4 allele and the apparent protective effect of the epsilon2 allele are similar to patterns observed in white subjects.
BACKGROUND: The association between Alzheimer disease (AD) and genotypes at the apolipoprotein E (APOE) locus has been confirmed in numerous populations worldwide, but appears to be inconsistent in African American subjects. OBJECTIVE: To investigate the association between APOE genotypes and AD in elderly African American subjects. DESIGN: Clinic-based, multicenter case-control study and a family study. PARTICIPANTS: A total of 338 African American probands meeting criteria for probable or definite AD, 301 cognitively healthy, elderly unrelated control subjects (spouses and community volunteers), and 108 siblings of 88 AD probands. MAIN OUTCOME MEASURES: Odds of AD according to APOE genotype. RESULTS: Compared with individuals with the APOEepsilon3/epsilon3, the odds of having AD were significantly increased among those with 1 or more copies of the epsilon4 allele; the odds ratio (OR) for the epsilon3/epsilon4 genotype was 2.6 (95% confidence interval [CI], 1.8-3.7), and the OR for the epsilon4/epsilon4 genotype was 10.5 (95% CI, 5.1-21.8). These risks decreased substantially after 68 years of age. The risk for AD was lower among individuals with the epsilon2/epsilon3 genotype (OR, 0.41; 95% CI, 0.22-0.79). The patterns of association were similar in men and women. These results obtained from comparisons of unrelated ADpatients and controls were bolstered by results of analysis of family data that showed preferential transmission of the epsilon4 allele to demented siblings (P<<.001) and of the epsilon2 allele to nondemented siblings (P=.005). CONCLUSIONS: The presence of 1 or 2 epsilon4 alleles is a determinant of AD risk in African American subjects. The age-related risk for decline associated with the epsilon4 allele and the apparent protective effect of the epsilon2 allele are similar to patterns observed in white subjects.
Authors: Mark W Logue; Matthew Schu; Badri N Vardarajan; Jacki Buros; Robert C Green; Rodney C P Go; Patrick Griffith; Thomas O Obisesan; Rhonna Shatz; Amy Borenstein; L Adrienne Cupples; Kathryn L Lunetta; M Daniele Fallin; Clinton T Baldwin; Lindsay A Farrer Journal: Arch Neurol Date: 2011-12
Authors: Ekaterina Rogaeva; Yan Meng; Joseph H Lee; Yongjun Gu; Toshitaka Kawarai; Fanggeng Zou; Taiichi Katayama; Clinton T Baldwin; Rong Cheng; Hiroshi Hasegawa; Fusheng Chen; Nobuto Shibata; Kathryn L Lunetta; Raphaelle Pardossi-Piquard; Christopher Bohm; Yosuke Wakutani; L Adrienne Cupples; Karen T Cuenco; Robert C Green; Lorenzo Pinessi; Innocenzo Rainero; Sandro Sorbi; Amalia Bruni; Ranjan Duara; Robert P Friedland; Rivka Inzelberg; Wolfgang Hampe; Hideaki Bujo; You-Qiang Song; Olav M Andersen; Thomas E Willnow; Neill Graff-Radford; Ronald C Petersen; Dennis Dickson; Sandy D Der; Paul E Fraser; Gerold Schmitt-Ulms; Steven Younkin; Richard Mayeux; Lindsay A Farrer; Peter St George-Hyslop Journal: Nat Genet Date: 2007-01-14 Impact factor: 38.330
Authors: Karen T Cuenco; Robert C Green; J Zhang; Kathryn Lunetta; Porat M Erlich; L Adrienne Cupples; Lindsay A Farrer; Charles DeCarli Journal: J Neuroimaging Date: 2008-07 Impact factor: 2.486
Authors: Ibidapo Akinleye; J Scott Roberts; Charmaine D M Royal; Erin Linnenbringer; Thomas O Obisesan; Grace-Ann Fasaye; Robert C Green Journal: J Genet Couns Date: 2011-06-09 Impact factor: 2.537
Authors: Jill R Murrell; Brandon Price; Kathleen A Lane; Olusegun Baiyewu; Oye Gureje; Adesola Ogunniyi; Frederick W Unverzagt; Valerie Smith-Gamble; Sujuan Gao; Hugh C Hendrie; Kathleen S Hall Journal: Arch Neurol Date: 2006-03