{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T05:24:03Z","timestamp":1787203443424,"version":"build-2736575974"},"reference-count":54,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:00:00Z","timestamp":1787011200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004772","name":"Natural Science Foundation of Ningxia Province","doi-asserted-by":"publisher","award":["2023AAC05036"],"award-info":[{"award-number":["2023AAC05036"]}],"id":[{"id":"10.13039\/501100004772","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004772","name":"Natural Science Foundation of Ningxia Province","doi-asserted-by":"publisher","award":["2024AAC03247"],"award-info":[{"award-number":["2024AAC03247"]}],"id":[{"id":"10.13039\/501100004772","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004772","name":"Natural Science Foundation of Ningxia Province","doi-asserted-by":"publisher","award":["2024BEH04022"],"award-info":[{"award-number":["2024BEH04022"]}],"id":[{"id":"10.13039\/501100004772","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Ningxia Medical University","award":["XT2022024"],"award-info":[{"award-number":["XT2022024"]}]},{"name":"Ningxia Medical University","award":["XJKF230109"],"award-info":[{"award-number":["XJKF230109"]}]},{"name":"Ningxia Medical University","award":["XJKF230204"],"award-info":[{"award-number":["XJKF230204"]}]},{"name":"Ningxia Medical University","award":["JCXK2025003"],"award-info":[{"award-number":["JCXK2025003"]}]},{"award":["XT2022024"],"award-info":[{"award-number":["XT2022024"]}],"id":[{"id":"https:\/\/ror.org\/02h8a1848","id-type":"ROR","asserted-by":"publisher"}]},{"award":["XJKF230109"],"award-info":[{"award-number":["XJKF230109"]}],"id":[{"id":"https:\/\/ror.org\/02h8a1848","id-type":"ROR","asserted-by":"publisher"}]},{"award":["XJKF230204"],"award-info":[{"award-number":["XJKF230204"]}],"id":[{"id":"https:\/\/ror.org\/02h8a1848","id-type":"ROR","asserted-by":"publisher"}]},{"award":["JCXK2025003"],"award-info":[{"award-number":["JCXK2025003"]}],"id":[{"id":"https:\/\/ror.org\/02h8a1848","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biology"],"abstract":"<jats:p>Background: Elevated plasma homocysteine (HCY) is a risk factor for Alzheimer\u2019s disease (AD), but its relationship with structural brain changes across the AD continuum remains unclear. The choroid plexus (CP) regulates cerebrospinal fluid homeostasis and may interface with peripheral metabolic signals. Whether HCY relates to CP structural alterations and disease progression remains unknown. Methods: We analyzed 819 Alzheimer\u2019s Disease Neuroimaging Initiative (ADNI) participants (229 cognitively normal (CN), 397 with mild cognitive impairment (MCI), and 193 with AD dementia). Multinomial logistic regression assessed associations between HCY and diagnosis under stepwise covariate adjustment. Phenotype-wide structural magnetic resonance imaging (MRI) mapping identified HCY-associated signals. Cox models evaluated associations of CP volume (CPV) with CN-to-MCI and MCI-to-AD dementia conversion and whether CPV added prognostic discrimination beyond baseline disease-severity markers. Independent human CP single-nucleus and spatial transcriptomic datasets were reanalyzed to characterize epithelial expression states and their spatial organization in a hypothesis-generating analysis. Results: Higher HCY was associated with MCI and AD dementia; however, the AD association attenuated after adjustment for renal function, vitamin B12, and medications, whereas the MCI association remained stable. CPV was among the HCY-associated MRI signals that persisted after progressive covariate adjustment. Right and bilateral CPV showed model-dependent associations with MCI-to-AD dementia conversion. In the disease-severity sensitivity analysis, larger right and bilateral CPV remained associated with a higher risk of progression from MCI to AD dementia. Single-nucleus analysis identified two CP epithelial states with relatively high expression of one-carbon metabolism-related genes, termed one-carbon metabolism-enriched epithelial state A (OCM-Epi-A) and state B (OCM-Epi-B). Donor-level pseudobulk analysis did not identify pathway enrichment after false discovery rate correction, whereas OCM-Epi-A\u2013like spots were located near endothelial spots more often than expected by chance in three of the four spatial samples. Conclusions: Circulating HCY was associated with larger CPV, and larger CPV showed model-dependent associations with MCI-to-AD dementia progression. Independent transcriptomic reanalysis identified one-carbon metabolism-enriched epithelial states and their spatial organization in postmortem CP tissue, providing hypothesis-generating tissue-level context for the ADNI associations.<\/jats:p>","DOI":"10.3390\/biology15161423","type":"journal-article","created":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T13:11:57Z","timestamp":1787058717000},"page":"1423","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Circulating Homocysteine and Choroid Plexus Volume Across the Alzheimer\u2019s Disease Continuum: Cross-Sectional and Progression-Related Associations"],"prefix":"10.3390","volume":"15","author":[{"given":"Chenjie","family":"Feng","sequence":"first","affiliation":[{"name":"College of Medical Information and Engineering, Ningxia Medical University, Yinchuan 750004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tian","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Medical Information and Engineering, Ningxia Medical University, Yinchuan 750004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianglong","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Public Health, Ningxia Medical University, Yinchuan 750004, China"},{"name":"Ningxia Key Laboratory of Environmental Factors and Chronic Disease Control, Yinchuan 750004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhe","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Medical Information and Engineering, Ningxia Medical University, Yinchuan 750004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Zhao","sequence":"additional","affiliation":[{"name":"School of Public Health, Ningxia Medical University, Yinchuan 750004, China"},{"name":"Ningxia Key Laboratory of Environmental Factors and Chronic Disease Control, Yinchuan 750004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Medical Information and Engineering, Ningxia Medical University, Yinchuan 750004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"60","DOI":"10.1186\/s13195-017-0283-5","article-title":"On the Path to 2025: Understanding the Alzheimer\u2019s Disease Continuum","volume":"9","author":"Aisen","year":"2017","journal-title":"Alzheimers Res. 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