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Study finds genes associated with hippocampal atrophy
Date:6/28/2012

(Boston) -- In a genome-wide association (GWA) study, researchers from Boston University Schools of Medicine (BUSM) and Public Health (BUSPH) have identified several genes which influence degeneration of the hippocampus, the part of the brain most associated with Alzheimer disease (AD). The study, which currently appears online as a Rapid Communication in the Annals of Neurology, demonstrates the efficacy of endophenotypes for broadening the understanding of the genetic basis of and pathways leading to AD.

AD is a progressive neurodegenerative disorder for which there are no prevention methods. Available drugs only marginally affect disease severity and progression, making AD effectively untreatable.

GWA studies using very large samples have increased the number of robust associations to 10 genes, including APOE. However, these genes account for no more than 35 percent of the inherited risk of AD and most of the genetic underpinning of the disorder remains unexplained. According to the researchers, magnetic resonance imaging (MRI) of the brain provides in vivo quantitative measures of neurodegenerative and cerebrovascular brain injury that may represent AD-related changes long before clinical symptoms appear. These measures are more powerful than comparisons of individuals with AD with cognitively healthy persons because they avoid misclassification of normal persons who will develop disease in the future.

BUSM researchers conducted a two-stage GWA study for quantitative measures of hippocampal volume (HV), total cerebral volume (TCV) and white matter hyperintensities (WMH). Brain MRI measures of HV, TCV and WMH were obtained from 981 Caucasian and 419 African-American AD cases and their cognitively normal siblings in the MIRAGE (Multi Institutional Research in Alzheimer's Genetic Epidemiology) Study. In addition, similar MRI measures were obtained from 168 AD cases, 336 individuals with mild cognitive impairment and 188 co
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Contact: Gina DiGravio
gina.digravio@bmc.org
617-638-8480
Boston University Medical Center
Source:Eurekalert

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