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This study reports the first genome-wide association study of cortical LBA, as estimated by a deep neural network from the\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>1<\/jats:italic>\n                    <\/jats:sub>\n                    -weighted magnetic resonance images of 41,708 cognitively normal adults in the UK Biobank. We identified 1,212 single-nucleotide polymorphisms (SNPs) significantly associated with LBA in at least one brain region. Genes mapped to these SNPs are involved in developmental, metabolic, immune, and cytoskeletal pathways. Dimensionality reduction of SNP association profiles uncovered three clusters linked to morphogenetic, cytoskeletal, and immuno-epigenetic processes, helping to relate neuroanatomic, immunosenescent and epigenetic mechanisms of brain aging. Top variants are mapped to\n                    <jats:italic>KCNK2<\/jats:italic>\n                    ,\n                    <jats:italic>NUAK1<\/jats:italic>\n                    ,\n                    <jats:italic>GMNC<\/jats:italic>\n                    ,\n                    <jats:italic>MSL2<\/jats:italic>\n                    , and to other genes implicated in neurodevelopment and neurodegeneration. Spatial clustering of LBA-associated variants in default mode, limbic, and motor network regions parallel regional vulnerability to Alzheimer\u2019s disease and frontotemporal dementia. These findings establish a polygenic architecture for regional brain aging and support LBA as a genetically informed phenotype for studying aging-related neurodegeneration. Our results suggest that cortical aging is not governed by isolated loci but by coordinated genetic programs\u2014rooted in development, metabolism, and cellular structure\u2014that confer lifelong patterns of regional brain vulnerability and resilience. This first genetic dissection of spatially specific brain aging reveals a polygenic landscape of coordinated genetic programs, developmentally encoded and metabolically maintained during senescence. This study reframes aging as an anatomically specific genetic process reflecting the varying structural vulnerabilities observed across neurodegenerative diseases.\n                  <\/jats:p>","DOI":"10.1007\/s11357-025-02046-1","type":"journal-article","created":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T21:53:07Z","timestamp":1765489987000},"page":"3729-3753","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Deep neural networks and genome-wide associations reveal the polygenic architecture of local brain aging"],"prefix":"10.1007","volume":"48","author":[{"given":"Nicholas J.","family":"Kim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ayati","family":"Mishra","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nahian F.","family":"Chowdhury","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel D.","family":"Anderson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Owen M.","family":"Vega","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikhil N.","family":"Chaudhari","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenneth H.","family":"Buetow","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul M.","family":"Thompson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9254-9388","authenticated-orcid":false,"given":"Andrei","family":"Irimia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,12,11]]},"reference":[{"issue":"3","key":"2046_CR1","doi-asserted-by":"publisher","first-page":"883","DOI":"10.1016\/j.neuroimage.2010.01.005","volume":"50","author":"K Franke","year":"2010","unstructured":"Franke K, Ziegler G, Kl\u00f6ppel S, Gaser C, Alzheimer\u2019s Disease Neuroimaging Initiative. 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