{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T17:30:10Z","timestamp":1777397410014,"version":"3.51.4"},"reference-count":73,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2025,7,1]],"date-time":"2025-07-01T00:00:00Z","timestamp":1751328000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2025,7,1]],"date-time":"2025-07-01T00:00:00Z","timestamp":1751328000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"name":"Alzheimer's Research UK"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Journal of Alzheimer\u2019s Disease"],"published-print":{"date-parts":[[2025,7]]},"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Late-onset Alzheimer's disease is consistently associated with alterations in the default-mode network (DMN)\u2014a large-scale brain network associated with self-related processing and memory. However, the functional organization of DMN is far less clear in young-onset Alzheimer's disease (YOAD).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>The current study aimed to identify effective connectivity changes in the core DMN nodes between YOAD variants and healthy controls.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We assessed resting-state DMN effective connectivity in two common YOAD variants (i.e., amnestic variant (n\u2009=\u200926) and posterior cortical atrophy (n\u2009=\u200913) and healthy participants (n\u2009=\u200924) to identify disease- and variant-specific connectivity differences using spectral dynamic causal modelling.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Patients with the amnestic variant showed increased connectivity from prefrontal cortex to posterior DMN nodes relative to healthy controls, whereas patients with posterior cortical atrophy exhibited decreased posterior DMN connectivity. Right hippocampus connectivity differentiated the two patient groups. Furthermore, disease-related connectivity alterations were also predictive of group membership and cognitive performance.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>These findings suggest that resting-state DMN effective connectivity provides a new understanding of neural mechanisms underlying the disease pathology and cognition in YOAD.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/13872877251344325","type":"journal-article","created":{"date-parts":[[2025,5,22]],"date-time":"2025-05-22T03:15:50Z","timestamp":1747883750000},"page":"653-667","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Neural mechanisms of disease pathology and cognition in young-onset Alzheimer's disease variants"],"prefix":"10.1177","volume":"106","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4734-9835","authenticated-orcid":false,"given":"Seda","family":"Sacu","sequence":"first","affiliation":[{"name":"Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Catherine F","family":"Slattery","sequence":"additional","affiliation":[{"name":"Department of Neurodegenerative Disease, Institute of Neurology, University College London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karl J","family":"Friston","sequence":"additional","affiliation":[{"name":"Wellcome Centre for Human Neuroimaging, Institute of Neurology, University College London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ross W","family":"Paterson","sequence":"additional","affiliation":[{"name":"Department of Neurodegenerative Disease, Institute of Neurology, University College London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexander JM","family":"Foulkes","sequence":"additional","affiliation":[{"name":"Department of Neurodegenerative Disease, Institute of Neurology, University College London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keir","family":"Yong","sequence":"additional","affiliation":[{"name":"Department of Neurodegenerative Disease, Institute of Neurology, University College London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sebastian","family":"Crutch","sequence":"additional","affiliation":[{"name":"Department of Neurodegenerative Disease, Institute of Neurology, University College London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jonathan M","family":"Schott","sequence":"additional","affiliation":[{"name":"Department of Neurodegenerative Disease, Institute of Neurology, University 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