Abstract
We present a pilot, single-subject longitudinal analysis of plasma antibodies and proteome dynamics across 310 days spanning COVID-19 vaccination and subsequent SARS-CoV-2 infection. Serial plasma samples were analyzed by DIA-LC-MS/MS, identifying 1502 proteins. Comparative analyses across key intervals (pre-vaccination, post-dose 1, post-dose 2, and post-infection) showed minimal proteomic shifts after vaccination but distinct, coordinated expression changes after SARS-CoV-2 infection.
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Data availability
The raw and processed mass spectrometry data have been deposited in JPOST (JPST003696) and registered with ProteomeXchange (PXD062242).
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Acknowledgements
We would like to express our sincere appreciation to Ms. Akiko Fukuda (Laboratory for Systems Biology and Medicine, Isotope Science Center, The University of Tokyo) for her invaluable assistance in conducting the antibody titer measurements, and to Ms. Noriko Kagi (Biotage Japan Ltd., Tokyo, Japan) for her expert technical support with the LV-200 experiments.
Funding
This study was supported by Medical & Biological Laboratories Co., Ltd., and Shenzhen YHLO Biotech Co., Ltd. (the distributor and manufacturer of the antibody measurement system, iFlash 3000); by grants from Peace Winds Japan, Kowa Co., and the Research Center for Advanced Science and Technology at the University of Tokyo; and by the Japan Agency for Medical Research and Development (AMED) under the Grant-in-Aid for the Development of Vaccines for the Novel Coronavirus Disease (Grant Number: 22nf0101638h0002).
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Author ContributionsT.F. performed plasma sample preprocessing, DIA-LC–MS analysis, data evaluation, and verification of analytical accuracy and validity. He also prepared all tables and figures and wrote the main text of the manuscript.A.N. conducted antibody titer measurements and performed DIA-LC–MS sample measurements.Y.C. examined the DIA-LC–MS results and analyzed the data using DIA-NN.Y.B. supervised the experimental application of DIA-NN and the S-Trap method.T.K. verified the accuracy and validity of antibody assays and DIA-LC–MS analysis, and supervised the overall progress of the study.All authors reviewed and approved the final manuscript.
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During the preparation of this work, the author used ChatGPT (OpenAI) to improve the clarity and readability of the manuscript. After using this tool, the authors reviewed and edited the content as needed and took full responsibility for the content of the publication.
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The authors declare no competing interests.
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This study was approved by the Institutional Ethics Committee of The University of Tokyo (approval number: 23–230). Informed consent was obtained from all individual participants included in the study.
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Fukuda, T., Nakayama, A., Chikaoka, Y. et al. Antibody profiling and plasma proteomics in SARS-CoV-2 infection: a pilot study. Sci Rep (2026). https://doi.org/10.1038/s41598-026-48765-z
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DOI: https://doi.org/10.1038/s41598-026-48765-z


