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Evidence for an Alzheimer Disease Susceptibility Locus on Chromosome 12 and for Further Locus Heterogeneity
Ekaterina Rogaeva, PhD;
Smita Premkumar, PhD;
Youqiang Song, PhD;
Sandro Sorbi, MD;
Nicholas Brindle, MBBCh, MRCP;
Andrew Paterson, MD, FRCPC;
Ranjan Duara, MD;
Georges Levesque, PhD;
Gang Yu, PhD;
Masaki Nishimura, MD, PhD;
Masaki Ikeda, MD;
Colleen O'Toole, BA;
Toshitaka Kawarai, MD, PhD;
Ricardo Jorge, MD, PhD;
Daniel Vilarino, MD;
Amalia C. Bruni, MD;
Lindsay A. Farrer, PhD;
Peter H. St. George-Hyslop, MD, FRCPC
JAMA. 1998;280:614-618.
Context.— Alzheimer disease (AD) susceptibility genes have been identified on chromosomes 1, 14, 19, and 21, and a recent study has suggested a locus on chromosome 12.
Objective.— To confirm or refute the existence of a familial AD susceptibility locus on chromosome 12 in an independent sample of familial AD cases.
Design.— Retrospective cohort study. DNA data for 6 chromosome 12 genetic markers were evaluated using parametric lod score and nonparametric linkage methods and linkage heterogeneity tests. The latter include the admixture test of homogeneity in the total group of families and the predivided sample test in families stratified by the presence or absence of an apolipoprotein E (APOE)  4 allele among affected members. Parametric analyses were repeated assuming autosomal dominant inheritance of AD and either age- and sex-dependent penetrance or zero penetrance for the analysis of unaffected relatives.
Setting.— Clinical populations in the continental United States, Canada, Argentina, and Italy.
Patients.— Fifty-three white families composed of multiple members affected with AD, from whom DNA samples were obtained from 173 patients with AD whose conditions were diagnosed using established criteria and from 146 nondemented relatives.
Main Outcome Measure.— Presence of an APOE 4 allele among affected family members.
Results.— Using parametric methods, no evidence for linkage to the region spanned by the chromosome 12 markers could be detected if familial AD is assumed to arise from the same genetic locus in all 53 families. However, significant evidence for linkage was detected in the presence of locus heterogeneity using the admixture test (odds ratio, 15, 135:1). The estimated proportion of linked families within the 53 families examined varied between 0.40 and 0.65, depending on the genetic model assumed and APOE status. The precise location of the AD gene could not be determined, but includes the entire region suggested previously. Nonparametric linkage analysis confirmed linkage to chromosome 12 with the strongest evidence at D12S96 (P<.001).
Conclusions.— Our data provide independent confirmation of the existence of an AD susceptibility locus on chromosome 12 and suggest the existence of AD susceptibility genes on other chromosomes. Screening a larger set of families with additional chromosome markers will be necessary for identifying the chromosome 12 AD gene.
From the Centre for Research in Neurodegenerative Diseases, Division of Neurology, Department of Medicine (Drs Rogaeva, Song, Brindle, Levesque, Yu, Nishimura, Ikeda, Kawarai, and St. George-Hyslop and Ms O\'Toole) and the Neurogenetics Laboratory, Clarke Institute of Psychiatry (Dr Paterson), University of Toronto, and the Division of Neurology, Department of Medicine, The Toronto Hospital (Drs Rogaeva, Song, Brindle, Levesque, Yu, Nishimura, Ikeda, Kawarai, and St George-Hyslop and Ms O\'Toole), Toronto, Ontario; the Genetics Program, Boston University School of Medicine, Boston, Mass (Drs Premkumar and Farrer); the Department of Neurology and Psychiatry, University of Florence, Firenze, Italy (Dr Sorbi); the Department of Neurology, Mount Sinai Medical Center, Miami Beach, Fla (Dr Duara); the Department of Neurology, Hospital de Clinicas, Buenos Aires University, Buenos Aires, Argentina (Drs Jorge and Vilarino); and the Centro Regionale di Neurogenetica ASL 6, Lamezia Terme, Italy (Dr Bruni).
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