期刊
BEHAVIOURAL BRAIN RESEARCH
卷 207, 期 2, 页码 377-386出版社
ELSEVIER
DOI: 10.1016/j.bbr.2009.10.022
关键词
BDNF Val(66)Met; fMRI; Multiple sclerosis; Working memory; Imaging genetic
资金
- Fondazione Italiana Sclerosi Multipla [2003/R/24]
Relatively little is known about genetic determinants of cognitive dysfunction in multiple sclerosis (MIS). A growing body of evidence demonstrates that a functional variant of the brain-derived neurotrophic factor (BDNF) gene, the Val(66)Met polyrnorphism, contributes to poor hippocampal and prefrontal functions, particularly memory processes, in healthy controls. In contrast, findings from previous association studies examining this polymorphism and memory performance in MS patients yielded conflicting results. However, the way in which this BDNF polymorphism affects brain function in MS patients has not been examined. In line with the intermediate phenotype approach, we assessed effects of the BDNF Val(66)Met polymorphism on brain activity during a spatial working memory task. We used functional magnetic resonance imaging (fMRI) to measure brain responses in a total of 61 subjects comprising 29 relapsing-remitting MS patients and 32 healthy controls. The fMRI results demonstrated association of the BDNF polymorphism with brain activity during working memory, with opposite effects in MS patients and controls. Healthy carriers of the Met(66) allele showed increased activation of the parieto-prefrontal network and altered disengagement of the ventro-medial prefrontal cortex and hippocampus in comparison with their respective Val(66) counterparts. Analysis within the group demonstrated that this working memory-related activation pattern was absent in MIS patients. Our imaging genetic study demonstrates that the Val(66)Met polymorphism of the BDNF gene contributes to some of the individual variability in the functional response to a working memory challenge in healthy controls but it does not provide evidence for an MS-specific pattern of gene action. (C) 2009 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据