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Thalamo-cortical network hyperconnectivity in preclinical progranulin mutation carriers.
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Lee, Suzee E; Sias, Ana C; Kosik, Eena L; Flagan, Taru M; Deng, Jersey; Chu, Stephanie A; Brown, Jesse A; Vidovszky, Anna A; Ramos, Eliana Marisa; Gorno-Tempini, Maria Luisa; Karydas, Anna M; Coppola, Giovanni; Geschwind, Daniel H; Rademakers, Rosa; Boeve, Bradley F; Boxer, Adam L; Rosen, Howard J; Miller, Bruce L; Seeley, William W. - : eScholarship, University of California, 2019
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Abstract:
Mutations in progranulin (GRN) cause heterogeneous clinical syndromes, including behavioral variant frontotemporal dementia (bvFTD), primary progressive aphasia (PPA), corticobasal syndrome (CBS) and Alzheimer-type dementia (AD-type dementia). Human studies have shown that presymptomatic GRN carriers feature reduced connectivity in the salience network, a system targeted in bvFTD. Mice with homozygous deletion of GRN, in contrast, show thalamo-cortical hypersynchrony due to aberrant pruning of inhibitory synapses onto thalamo-cortical projection neurons. No studies have systematically explored the intrinsic connectivity networks (ICNs) targeted by the four GRN-associated clinical syndromes, or have forged clear links between human and mouse model findings. We compared 17 preclinical GRN carriers (14 "presymptomatic" clinically normal and three "prodromal" with mild cognitive symptoms) to healthy controls to assess for differences in cognitive testing and gray matter volume. Using task-free fMRI, we assessed connectivity in the salience network, a non-fluent variant primary progressive aphasia network (nfvPPA), the perirolandic network (CBS), and the default mode network (AD-type dementia). GRN carriers and controls showed similar performance on cognitive testing. Although carriers showed little evidence of brain atrophy, markedly enhanced connectivity emerged in all four networks, and thalamo-cortical hyperconnectivity stood out as a unifying feature. Voxelwise assessment of whole brain degree centrality, an unbiased graph theoretical connectivity metric, confirmed thalamic hyperconnectivity. These results show that human GRN disease and the prevailing GRN mouse model share a thalamo-cortical network hypersynchrony phenotype. Longitudinal studies will determine whether this network physiology represents a compensatory response as carriers approach symptom onset, or an early and sustained preclinical manifestation of lifelong progranulin haploinsufficiency.
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Keyword:
2.1 Biological and endogenous factors; Acquired Cognitive Impairment; Adult; Aged; Aging; Alzheimer's Disease; Alzheimer's Disease including Alzheimer's Disease Related Dementias (AD/ADRD); Alzheimer's Disease Related Dementias (ADRD); Behavioral and Social Science; Brain Disorders; Cerebral Cortex; Clinical Research; Cognitive Dysfunction; Connectome; Dementia; Female; Frontotemporal Dementia; Frontotemporal Dementia (FTD); GRN; Heterozygote; Humans; Magnetic Resonance Imaging; Male; Middle Aged; MRI; Nerve Net; Neurodegenerative; Neurological; Neurosciences; Prodromal Symptoms; Progranulin; Progranulins; Rare Diseases; Thalamus
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URL: https://escholarship.org/uc/item/6vv8g8qt
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Thalamo-cortical network hyperconnectivity in preclinical progranulin mutation carriers.
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Discourse Process Training and Attention Process Training 2 in Adults with Traumatic Brain Injury
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Bilingualism and language similarity modify the neural mechanisms of selective attention. ...
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Bilingualism and language similarity modify the neural mechanisms of selective attention.
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Language lateralisation measured across linguistic and national boundaries.
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In: Cortex; a journal devoted to the study of the nervous system and behavior, vol. 111, pp. 134-147 (2019)
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