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Linkage disequilibrium in the 13q12 region in Finnish late onset Alzheimer's disease patients.

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By Hiltunen M, Mannermaa A, Koivisto AM, Lehtovirta M • www.ProHealth.com • September 1, 1999


Alzheimer's disease (AD) is a complex neurodegenerative disorder, for which several disease-associated loci have been located on different chromosomes. We have used a population-based linkage disequilibrium mapping approach in order to find potential AD-associated loci on chromosome 13. To avoid population stratification, late onset AD patients and age-matched controls were carefully chosen from the same geographical area in Eastern Finland, where the population is mainly descended from a small group of original founders.

During the initial screening with chromosome 13-specific microsatellite markers, tetranucleotide marker D13S787 was found to be in linkage disequilibrium in the 13q12 region. Screening this region with additional microsatellite markers revealed that marker D13S292 was also significantly associated with AD. Stratification of the AD patients and controls into groups according to apolipoprotein E, sex, and familial/sporadic status indicated that the 13q12 locus was associated with female familial AD patients regardless of ApoE genotype. Based on the physical data from the region 13q12, markers D13S292 and D13S787 were estimated to reside in a 810kb long YAC clone 754h7 together with two infant brain-derived ESTs and the H,K-ATPase alpha-subunit protein gene (ATP1AL1).

The localisation of these sequences at the linkage disequilibrium region suggests that they may be candidate genes involved in a sex-specific effect during development of AD.

Source: Eur J Hum Genet 1999 Sep;7(6):652-8
PMID: 10482953, UI: 99415283

(Department of Neurology, University Hospital and University of Kuopio, Finland. mhiltune@messi.uku.fi)




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