Functional brain network centrality is related to APOE genotype in cognitively normal elderly
Brain Behav. 2018-08-22; 8(9): e01080
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Wink AM(1), Tijms BM(2), Ten Kate M(2), Raspor E(1), de Munck JC(3), Altena E(4)(5), Ecay-Torres M(6), Clerigue M(6), Estanga A(6), Garcia-Sebastian M(6), Izagirre A(6), Martinez-Lage Alvarez P(6), Villanua J(6)(7), Barkhof F(1)(8), Sanz-Arigita E(1)(4).
(1)Department of Radiology, Nuclear Medicine and PET Research, Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands.
(2)Department of Neurology, Alzheimer Centre, Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands.
(3)Department of Physics and Medical Technology, Neuroscience Campus Amsterdam, VU University Medical Centre, Amsterdam, The Netherlands.
(4)Université Bordeaux, Bordeaux, France.
(5)CNRS, SANPSY, USR 3413, Bordeaux, France.
(6)CITA Alzheimer Foundation, Donostia University Hospital, San Sebastian, Spain.
(7)Donostia Unit, Osatek, Donostia University Hospital, San Sebastian, Spain.
(8)Institutes of Neurology and Healthcare Engineering, University College London, London, UK.
INTRODUCTION: Amyloid plaque deposition in the brain is an early pathological change in Alzheimer’s disease (AD), causing disrupted synaptic connections. Brain network disruptions in AD have been demonstrated with eigenvector centrality (EC), a measure that identifies central regions within networks. Carrying an apolipoprotein (APOE)-ε4 allele is a genetic risk for AD, associated with
increased amyloid deposition. We studied whether APOE-ε4 carriership is associated with EC disruptions in cognitively normal individuals.
METHODS: A total of 261 healthy middle-aged to older adults (mean age 56.6 years) were divided into high-risk (APOE-ε4 carriers) and low-risk (noncarriers) groups. EC was computed from resting-state functional MRI data. Clusters of between-group differences were assessed with a permutation-based method. Correlations between cluster mean EC with brain volume, CSF biomarkers, and psychological test scores were assessed.
RESULTS: Decreased EC in the visual cortex was associated with APOE-ε4 carriership, a genetic risk factor for AD. EC differences were correlated with age, CSF amyloid levels, and scores on the trail-making and 15-object recognition tests.
CONCLUSION: Our findings suggest that the APOE-ε4 genotype affects brain connectivity in regions previously found to be abnormal in AD as a sign of very early disease-related pathology. These differences were too subtle in healthy elderly to use EC for single-subject prediction of APOE genotype.
© 2018 The Authors. Brain and Behavior published by Wiley Periodicals, Inc.