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Covariate analysis of late-onset Alzheimer disease refines the chromosome 12 locus

Abstract

Alzheimer disease (AD) is a progressive neurodegenerative disorder of later life with a complex etiology and a strong genetic component. Several genomic screens have suggested that a region between chromosome 12p13 and 12q22 contains at least one additional locus underlying the susceptibility of AD. However, localization of this locus has been difficult. We performed a 5 cM microsatellite marker screen across 74 cM on chromosome 12 with 15 markers in 585 multiplex families consisting of 994 affected sibpairs and 213 other affected relative pairs. Analyses across the entire data set did not reveal significant evidence of linkage. However, suggestive linkage was observed in several subsets. In the 91 families where no affected individuals carry an ApoE ɛ4 allele, an HLOD score of 1.55 was generated at D12S1042. We further examined the linkage data considering the proposed linkages to chromosome 9 (D9S741) and chromosome 10 (α-catenin gene). There was a modest (P=0.20) increase in the LOD score for D12S368 (MLOD=1.70) when using the D9S741 LOD scores as a covariate and a highly significant (P<0.001) increase in the MLOD score (4.19) for D12S1701 in autopsy-confirmed families (n=228) when using α-catenin LOD scores as a covariate. In both cases, families with no evidence of linkage to D9S741 or α-catenin demonstrated most of the evidence of linkage to chromosome 12, suggesting locus heterogeneity. Taken together, our data suggest that the 16 cM region between D12S1042 and D12S368 should be the subject of further detailed genomic efforts for the disease.

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Acknowledgements

We thank all of the families who participated in this study. This study was supported by NIH Grants AG019757, AG021547, AG20135, and U24 AG21886 and a grant from the Alzheimer Association (IIRG-00-2006). This work used the core resources of the GCRC (MO1 RR-00095) and the CHGR at VUMC, and the CHG at DUMC.

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Correspondence to J L Haines.

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Liang, X., Schnetz-Boutaud, N., Kenealy, S. et al. Covariate analysis of late-onset Alzheimer disease refines the chromosome 12 locus. Mol Psychiatry 11, 280–285 (2006). https://doi.org/10.1038/sj.mp.4001766

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