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APOE ‐ ε4 shapes temporo‐parietal network properties in middle‐aged, cognitively unimpaired individuals: A graph theory analysis: Neuroimaging / imaging and genetics
Ist Teil von
Alzheimer's & dementia, 2020-12, Vol.16 (S4)
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Wiley Blackwell Single Titles
Beschreibungen/Notizen
Abstract
Background
The allele
ε4
of the
APOLIPOPROTEIN E
gene (
APOE‐ε4
) is the strongest genetic risk factor for sporadic Alzheimer's disease (AD). However, the underlying mechanisms are not well understood. Our objective was to assess the effect of the
APOE
‐
ε4
allele dose on brain functional connectivity networks in cognitively unimpaired middle‐age individuals, using resting‐state functional magnetic resonance imaging (rs‐fMRI) and graph theory.
Method
This research included resting state 3 tesla functional Magnetic Resonance Imaging (rs‐fMRI) data from 349 cognitively unimpaired subjects from the ALFA+ cohort study, in which clinical, genetic and AD core cerebrospinal fluid biomarkers (Aβ42 and p‐tau), measured using Elecsys® immunoassays (Roche Diagnostics) data were also collected. The sample was composed of 127 men and 222 women with a mean age of 60.2 years, 32 homozygous
ε4
, 123 heterozygous
ε4
and 164 non‐carriers. The CONN toolbox (matlab toolbox) was used to preprocess and analyze the fMRI images with the default pipelines and adjusting by age, sex and years of education. ROI‐to‐ROI bivariate correlations were performed using cortical ROIs of Harvard‐Oxford atlas to compute each subject adjacency matrix. After thresholding and binarizing these results, graph theory was used to analyze the differences between
APOE‐ε4
groups and false discovery rate (p‐FDR= 0.05) was applied.
Results
We observed
APOE‐ε4
allele‐dose dependent effects on multiple network properties, including reduced degree centrality, reduced global efficiency and increased average path length located in temporo‐parietal nodes: left temporo‐occipital fusiform cortex, occipital fusiform gyrus, right lateral parietal cortex, temporal pole and posterior superior temporal gyrus. In addition, increased betweenness centrality of the precuneus was also observed. (Figure 1). These results survived after adjusting the model for Aβ42 and p‐tau values.
Conclusion
APOE‐ε4
allele modulates the functional integration among cortical nodes within temporo‐parietal networks, which typically present structural and metabolic alterations in AD. Importantly, these effects survived after adjustment by AD core biomarkers, suggesting that they were selectively mediated by
APOE
genotype. The inclusion of neuropsychological data shall clarify whether this distinctive network configuration may represent a network vulnerability or underlie compensatory strategies.
Sprache
Englisch
Identifikatoren
ISSN: 1552-5260
eISSN: 1552-5279
DOI: 10.1002/alz.045092
Titel-ID: cdi_crossref_primary_10_1002_alz_045092
Format
–
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