Cited by 173Functional Brain Connectivity StudiesAdvanced Neuroimaging Techniques and ApplicationsComplex Network Analysis Techniques

Breakdown of Brain Connectivity Between Normal Aging and Alzheimer's Disease: A Structural k -Core Network Analysis

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Daianu, Madelaine, Jahanshad, Neda, Nir, Talia M., Toga, Arthur W., Jack, Clifford R., Weiner, Michael W., Thompson, for the Alzheimer's Disea, Paul M.·2013·Brain Connectivity

Abstract

Brain connectivity analyses show considerable promise for understanding how our neural pathways gradually break down in aging and Alzheimer's disease (AD). Even so, we know very little about how the brain's networks change in AD, and which metrics are best to evaluate these changes. To better understand how AD affects brain connectivity, we analyzed anatomical connectivity based on 3-T diffusion-weighted images from 111 subjects (15 with AD, 68 with mild cognitive impairment, and 28 healthy elderly; mean age, 73.7±7.6 SD years). We performed whole brain tractography based on the orientation distribution functions, and compiled connectivity matrices showing the proportions of detected fibers interconnecting 68 cortical regions. We computed a variety of measures sensitive to anatomical network topology, including the structural backbone--the so-called "k-core"--of the anatomical network, and the nodal degree. We found widespread network disruptions, as connections were lost in AD. Among other connectivity measures showing disease effects, network nodal degree, normalized characteristic path length, and efficiency decreased with disease, while normalized small-worldness increased, in the whole brain and left and right hemispheres individually. The normalized clustering coefficient also increased in the whole brain; we discuss factors that may cause this effect. The proportions of fibers intersecting left and right cortical regions were asymmetrical in all diagnostic groups. This asymmetry may intensify as disease progressed. Connectivity metrics based on the k-core may help understand brain network breakdown as cognitive impairment increases, revealing how degenerative diseases affect the human connectome.

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Authors
Daianu, M., Jahanshad, N., Nir, T. M., Toga, A. W., Jack, C. R., Weiner, M. W., & Thompson, F. T. A. D.
Affiliations
  • University of California, Los Angeles (US)
  • Mayo Clinic (US)
  • San Francisco VA Medical Center (US)
  • Department of Neurology, Imaging Genetics Center, Laboratory of Neuro Imaging, UCLA School of Medicine, Los Angeles, California.
Venue
Brain Connectivity
Published
2013-08
Volume
3
Issue
4
Pages
407-422
ISSN
  • 2158-0014 (ISSN-L)
  • 2158-0022
OpenAlex
W2079903691
Cited by
173
References
62
Citations by year
2026: 4 · 2025: 9 · 2024: 7 · 2023: 12 · 2022: 10 · 2021: 13 · 2020: 12 · 2019: 14 · 2018: 21 · 2017: 17 · 2016: 16 · 2015: 19 · 2014: 14 · 2013: 5
FWCI
9.87
Type
journal article
Language
en
Open access
Locations
  • Brain Connectivity (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • Foundation for the National Institutes of Health (P30AG010129, K01 AG030514, U01AG024904, Grant U01 AG024904, AG024904)
  • Alzheimer's Association (AG010129, U01 AG024904)
  • Bristol-Myers Squibb (U01 AG024904, AG024904)
  • Eli Lilly and Company (U01 AG024904, AG024904)
  • Pfizer (AG024904, U01 AG024904)
  • AstraZeneca
  • Biogen (U01 AG024904, AG024904)
  • F. Hoffmann-La Roche (AG024904, U01 AG024904)
  • Medpace (U01 AG024904)
  • Meso Scale Diagnostics (U01 AG024904, AG024904)
  • Synarc (U01 AG024904, P30 AG010129, K01 AG030514)
  • Alzheimer's Disease Neuroimaging Initiative (U01AG024904, AG024904, P30 AG010129, K01 AG030514)
  • Amorfix Life Sciences
  • BioClinica (U01 AG024904, AG024904)
  • Novartis Pharmaceuticals Corporation (U01 AG024904, AG024904)
  • Northern California Institute for Research and Education (U01 AG024904, K01 AG030514, P30 AG010129)
  • Bayer HealthCare
  • Eisai (U01 AG024904, AG024904)
  • Servier (AG024904, U01 AG024904)
  • IXICO (AG024904, U01 AG024904)
  • National Institutes of Health (3u01ag024904-10s2, U01-AG024904, Grant U01 AG024904, P30 AG010129 and K01 AG030514, AG010129, AG024904)
  • Genentech (AG024904, U01 AG024904)
  • University of California, Los Angeles
  • University of California, San Diego
  • Canadian Institutes of Health Research (U01 AG024904, K01 AG030514, P30 AG010129)
  • National Institute on Aging (U01-AG-024904, P30AG010129, AG 024904, K01AG030514, AG010129, EB008281)
  • National Institute of Biomedical Imaging and Bioengineering (R01EB008432, R01EB008281, U01 AG024904, AG024904)
  • Johnson and Johnson Pharmaceutical Research and Development (U01 AG024904)
  • Janssen Alzheimer Immunotherapy Research And Development (AG024904, U01 AG024904)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Complex Network Analysis Techniques
Keywords
Alzheimer's disease, normal aging, tractography, diffusion-weighted imaging, mild cognitive impairment, hemispheric lateralization, small-worldness, node degree
MeSH terms
Aged, Aged, 80 and over, Aging, Alzheimer Disease, Brain, Brain Mapping, Female, Humans, Magnetic Resonance Imaging, Male, Middle Aged, Nerve Net, Neural Pathways, Case-Control Studies, Diffusion Tensor Imaging, Cognitive Dysfunction

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