Cited by 64Advanced Neuroimaging Techniques and ApplicationsDementia and Cognitive Impairment ResearchFunctional Brain Connectivity Studies

An advanced white matter tract analysis in frontotemporal dementia and early-onset Alzheimer’s disease

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Daianu, Madelaine, Mendez, Mario F., Baboyan, Vatche G., Jin, Yan, Melrose, Rebecca J., Jimenez, Elvira E., Thompson, Paul M.·2016·Brain Imaging and Behavior

Abstract

Cortical and subcortical nuclei degenerate in the dementias, but less is known about changes in the white matter tracts that connect them. To better understand white matter changes in behavioral variant frontotemporal dementia (bvFTD) and early-onset Alzheimer's disease (EOAD), we used a novel approach to extract full 3D profiles of fiber bundles from diffusion-weighted MRI (DWI) and map white matter abnormalities onto detailed models of each pathway. The result is a spatially complex picture of tract-by-tract microstructural changes. Our atlas of tracts for each disease consists of 21 anatomically clustered and recognizable white matter tracts generated from whole-brain tractography in 20 patients with bvFTD, 23 with age-matched EOAD, and 33 healthy elderly controls. To analyze the landscape of white matter abnormalities, we used a point-wise tract correspondence method along the 3D profiles of the tracts and quantified the pathway disruptions using common diffusion metrics - fractional anisotropy, mean, radial, and axial diffusivity. We tested the hypothesis that bvFTD and EOAD are associated with preferential degeneration in specific neural networks. We mapped axonal tract damage that was best detected with mean and radial diffusivity metrics, supporting our network hypothesis, highly statistically significant and more sensitive than widely studied fractional anisotropy reductions. From white matter diffusivity, we identified abnormalities in bvFTD in all 21 tracts of interest but especially in the bilateral uncinate fasciculus, frontal callosum, anterior thalamic radiations, cingulum bundles and left superior longitudinal fasciculus. This network of white matter alterations extends beyond the most commonly studied tracts, showing greater white matter abnormalities in bvFTD versus controls and EOAD patients. In EOAD, network alterations involved more posterior white matter - the parietal sector of the corpus callosum and parahipoccampal cingulum bilaterally. Widespread but distinctive white matter alterations are a key feature of the pathophysiology of these two forms of dementia.

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  • Raw structural connectivity models showed alterations in the uncinate fasciculus, superior longitudinal fasciculus, corpus callosum, dentatorubrothalamic tract, and inferior fronto-occipital fasciculus.

    “we found alterations in the uncinate fasciculus (Agosta et al., 2012; Daianu et al., 2016; Iaccarino et al., 2015; Nguyen et al., 2013), superior longitudinal fasciculus (Agosta et al., 2012; Daianu et al., 2016), corpus callosum (Tovar-Moll et al., 2014), dentatorubrothalamic tract (Whitwell et al., 2011a), and inferior fronto-occipital fasciculus (Meijboom et al., 2017).”

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  1. Morris, R. G. (1996). Neurobiological correlates of cognitive dysfunc- tion. In R. G. Morris (Ed.), The cognitive neuropsychology of Alzheimer-type dementia (pp. 223-254). Oxford: Oxford University Press.
  2. Morrison, J., Scherr, S., Lewis, D., Campbell, M., Bloom, F., & Rogers, J. (1986). The laminar and regional distribution of neocortical somato- statin and neuritic plaques: Implications for Alzheimer's disease as a global neocortical disconnection syndrome. In A. Scheibel, A. Wechsler, & M. Brazier (Eds.), The biological substrates of Alzheimer's disease (pp. 115-131). Orlando: Academic.

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Authors
Daianu, M., Mendez, M. F., Baboyan, V. G., Jin, Y., Melrose, R. J., Jimenez, E. E., & Thompson, P. M.
Affiliations
  • University of Southern California (US)
  • University of California, Los Angeles (US)
Corresponding author
Thompson, Paul M.
Venue
Brain Imaging and Behavior
Published
2015-10-29
Volume
10
Issue
4
Pages
1038-1053
ISSN
  • 1931-7557 (ISSN-L)
  • 1931-7565
OpenAlex
W1919284595
Cited by
64
References
88
Citations by year
2026: 6 · 2025: 5 · 2023: 5 · 2022: 4 · 2021: 6 · 2020: 3 · 2019: 9 · 2018: 9 · 2017: 7 · 2016: 6 · 2015: 4
FWCI
7.02
Type
journal article
Language
en
Open access
Locations
  • Brain Imaging and Behavior (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (EB020403, MH097268)
  • National Institute on Aging (AG-016570, P50AG016570, AG040060, R01AG040060, R01AG034499, EB008281, P01AG052350)
  • National Institute of Mental Health (MH097268, R01MH097268)
  • National Institute of Biomedical Imaging and Bioengineering (EB 01651, R01EB008432, R01EB008281, U54EB020403, P41EB015922)
  • U.S. National Library of Medicine (EB008432, LM 05639, R01LM005639, EB008281)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
Keywords
behavioral variant frontotemporal dementia, early-onset Alzheimer's disease, white matter tracts, diffusion-weighted imaging, tractography, mean diffusivity, radial diffusivity, fractional anisotropy, uncinate fasciculus, corpus callosum, anterior thalamic radiation, cingulum, superior longitudinal fasciculus, white matter microstructure
MeSH terms
Alzheimer Disease, Brain, Female, Humans, Male, Mental Status Schedule, Middle Aged, Cohort Studies, Age of Onset, Imaging, Three-Dimensional, Diffusion Magnetic Resonance Imaging, Diffusion Tensor Imaging, Frontotemporal Dementia, White Matter

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