{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"medRxiv"}],"indexed":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T16:08:46Z","timestamp":1784304526413,"version":"3.55.0"},"posted":{"date-parts":[[2026,7,15]]},"group-title":"Occupational and Environmental Health","reference-count":91,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T00:00:00Z","timestamp":1784073600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,7,15]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:sec>\n                  <jats:title>Background<\/jats:title>\n                  <jats:p>Post-traumatic stress disorder (PTSD) remains highly prevalent affecting ~23% of World Trade Center (WTC) responders more than two decades after 9\/11. While MRI studies have identified neural differences associated with PTSD, these findings have not translated into improved treatment. We introduce a novel multimodal MRI approach, DAta-driven Network Connectivity Estimate (DANCE), integrating structural and functional magnetic resonance imaging (MRI) to better capture PTSD mechanisms and inform biomarkers.<\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>In 96 WTC responders, including 45 with current WTC-related PTSD and 51 without PTSD. We applied graph theory to resting-state functional MRI to identify functional hubs via eigenvector centrality and identified divergence between groups using partial least squares discriminant analysis (PLS-DA). From diffusion MRI, we reconstructed five anatomical tracts (i.e., streamlines) in the temporal lobes. Using DANCE, we quantified the differential distribution of streamlines of the reconstructed tracts connecting the functional hubs. We then tested whether WTC exposure duration moderated associations between PTSD and DANCE indices.<\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>Responders with PTSD showed altered centrality in nine functional hubs (AUC=0.75 (0.651-0.847)) including bilateral anterior inferior temporal gyrus, right superior parietal lobule, right anterior parahippocampal gyrus, right anterior\/posterior superior temporal gyrus (STG), right caudate nucleus, left amygdala and brainstem. Connectivity differences emerged in four tracts: hippocampus, parahippocampus, inferior and superior temporal gyri (STG). DANCE differed in the inferior fronto-occipital fasciculus (IFOF), medial (IFLmed) and lateral (IFLlat) components of the inferior longitudinal fasciculus and in the middle longitudinal fascicle (MdLF). WTC exposure duration significantly moderated the association between PTSD and DANCE values in the IFLmed, right posterior STG (p= 0.035).<\/jats:p>\n                <\/jats:sec>\n                <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>Our novel DANCE approach revealed converging functional and anatomical connectivity alterations uniquely associated with PTSD in WTC responders and offers compelling evidence for distinct neurobiological signatures of the disorder. These findings significantly advance our understanding of PTSD pathophysiology and highlight potential biomarkers for diagnosis and targeted intervention.<\/jats:p>\n                <\/jats:sec>","DOI":"10.64898\/2026.07.13.26357932","type":"posted-content","created":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T17:30:49Z","timestamp":1784136649000},"source":"Crossref","is-referenced-by-count":0,"title":["Toward multimodal MRI biomarkers of PTSD: functional and structural connectivity signatures in WTC responders"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7411-8552","authenticated-orcid":false,"given":"Azzurra","family":"Invernizzi","sequence":"first","affiliation":[{"name":"Department of Environmental Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Davide","family":"Folloni","sequence":"additional","affiliation":[{"name":"Nash Family Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA"},{"name":"Lipschultz Center for Cognitive Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elza","family":"Rechtman","sequence":"additional","affiliation":[{"name":"Department of Environmental Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alison C.","family":"Pellecchia","sequence":"additional","affiliation":[{"name":"World Trade Center Health and Wellness Program, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephanie","family":"Santiago-Michels","sequence":"additional","affiliation":[{"name":"World Trade Center Health and Wellness Program, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evelyn J.","family":"Bromet","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA, Department of Medicine, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto G.","family":"Lucchini","sequence":"additional","affiliation":[{"name":"Department of Environmental Health Sciences, Robert Stempel School of Public Health, Florida International University, Miami, Florida, USA, Program in Public Health and Department of Family, Population, and Preventive Medicine, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9008-7004","authenticated-orcid":false,"given":"Benjamin J.","family":"Luft","sequence":"additional","affiliation":[{"name":"World Trade Center Health and Wellness Program, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA"},{"name":"Department of Environmental Health Sciences, Robert Stempel School of Public Health, Florida International University, Miami, Florida, USA, Program in Public Health and Department of Family, Population, and Preventive Medicine, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6124-0329","authenticated-orcid":false,"given":"Sean A.","family":"Clouston","sequence":"additional","affiliation":[{"name":"World Trade Center Health and Wellness Program, Renaissance School of Medicine at Stony Brook University, Stony Brook, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheuk Y.","family":"Tang","sequence":"additional","affiliation":[{"name":"Department of Radiology and Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Megan K.","family":"Horton","sequence":"additional","affiliation":[{"name":"Department of Environmental Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"54368","reference":[{"key":"2026071708450682000_2026.07.13.26357932v1.1","doi-asserted-by":"crossref","unstructured":"Pietrzak, R. 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