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Mol. Neurosci."],"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>Alzheimer\u2019s disease (AD) is the most common neurodegenerative disease, imposing huge mental and economic burdens on patients and society. The specific molecular pathway(s) and biomarker(s) that distinguish AD from other neurodegenerative diseases and reflect the disease progression are still not well studied.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Four frontal cortical datasets of AD were integrated to conduct differentially expressed genes (DEGs) and functional gene enrichment analyses. The transcriptional changes after the integrated frontal cortical datasets subtracting the cerebellar dataset of AD were further compared with frontal cortical datasets of frontotemporal dementia and Huntingdon\u2019s disease to identify AD-frontal-associated gene expression. Integrated bioinformatic analysis and machine-learning strategies were applied for screening and determining diagnostic biomarkers, which were further validated in another two frontal cortical datasets of AD by receiver operating characteristic (ROC) curves.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Six hundred and twenty-six DEGs were identified as AD frontal associated, including 580 downregulated genes and 46 upregulated genes. The functional enrichment analysis revealed that immune response and oxidative stress were enriched in AD patients. Decorin (DCN) and regulator of G protein signaling 1 (RGS1) were screened as diagnostic biomarkers in distinguishing AD from frontotemporal dementia and Huntingdon\u2019s disease of AD. The diagnostic effects of DCN and RGS1 for AD were further validated in another two datasets of AD: the areas under the curve (AUCs) reached 0.8148 and 0.8262 in GSE33000, and 0.8595 and 0.8675 in GSE44770. There was a better value for AD diagnosis when combining performances of DCN and RGS1 with the AUCs of 0.863 and 0.869. Further, DCN mRNA level was correlated to CDR (Clinical Dementia Rating scale) score (<jats:italic>r<\/jats:italic> = 0.5066, <jats:italic>p<\/jats:italic> = 0.0058) and Braak staging (<jats:italic>r<\/jats:italic> = 0.3348, <jats:italic>p<\/jats:italic> = 0.0549).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>DCN and RGS1 associated with the immune response may be useful biomarkers for diagnosing AD and distinguishing the disease from frontotemporal dementia and Huntingdon\u2019s disease. DCN mRNA level reflects the development of the disease.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fnmol.2023.1152279","type":"journal-article","created":{"date-parts":[[2023,5,10]],"date-time":"2023-05-10T16:42:21Z","timestamp":1683736941000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Identification of biomarkers differentiating Alzheimer\u2019s disease from other neurodegenerative diseases by integrated bioinformatic analysis and machine-learning strategies"],"prefix":"10.3389","volume":"16","author":[{"given":"Boru","family":"Jin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guoqiang","family":"Fei","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shaoming","family":"Sang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chunjiu","family":"Zhong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2023,5,10]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1877","DOI":"10.1093\/brain\/aww083","article-title":"Thalamic pathology and memory loss in early Alzheimer\u2019s disease: moving the focus from the medial temporal lobe to Papez circuit.","author":"Aggleton","year":"2016","journal-title":"Brain."},{"key":"B2","doi-asserted-by":"publisher","first-page":"327","DOI":"10.1002\/alz.12328","article-title":"2021 Alzheimer\u2019s disease facts and figures","volume":"17","year":"2021","journal-title":"Alzheimers Dement"},{"key":"B3","doi-asserted-by":"publisher","DOI":"10.1016\/j.arr.2022.101619","article-title":"Oxidative stress: the core pathogenesis and mechanism of Alzheimer\u2019s disease.","volume":"77","author":"Bai","year":"2022","journal-title":"Ageing Res. 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