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Despite this realization, whole blood is generally viewed as a challenging analytical matrix in comparison to plasma or serum. Moreover, proteomic analyses of whole blood proteomics have almost exclusively focused on (non)targeted analyses of protein abundances and much less on post-translational modifications (PTMs). Here, we developed a streamlined workflow for processing twenty microliters of venous blood collected by volumetric absorptive microsampling that incorporates serial trypsinization, N-glycopeptide and phosphopeptide enrichment and avoids laborious sample dry-down or cleanup steps. Up to 10,000 analytes (reported as protein groups, glycopeptidoforms and phosphosites) were quantified by liquid chromatography-tandem mass spectrometry (LC-MS\/MS) in approximately 2 h of MS acquisition time. Using these methods, we explored the stability of \u201cdried\u201d and \u201cwet\u201d blood proteomes, as well as effects of ex vivo inflammatory stimulus or phosphatase inhibition. Multi-omics factor analysis enabled facile identification of analytes that contributed to inter-individual variability of the blood proteomes, including N-glycopeptides that distinguish immunoglobulin heavy constant alpha 2 allotypes. Collectively, our results help to establish feasibility and best practices for the integrated MS-based quantification of proteins and PTMs from dried blood.<\/jats:p>","DOI":"10.1101\/2025.09.26.678912","type":"posted-content","created":{"date-parts":[[2025,9,29]],"date-time":"2025-09-29T04:15:11Z","timestamp":1759119311000},"source":"Crossref","is-referenced-by-count":3,"title":["Development and validation of a streamlined workflow for proteomic analysis of proteins and post-translational modifications from dried blood"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0212-2346","authenticated-orcid":false,"given":"Matthew W.","family":"Foster","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Youwei","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9351-3996","authenticated-orcid":false,"given":"Marlene","family":"Violette","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael T.","family":"Forrester","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. 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