Molecular Systems Biology (Mar 2022)

Ultra‐high sensitivity mass spectrometry quantifies single‐cell proteome changes upon perturbation

  • Andreas‐David Brunner,
  • Marvin Thielert,
  • Catherine Vasilopoulou,
  • Constantin Ammar,
  • Fabian Coscia,
  • Andreas Mund,
  • Ole B Hoerning,
  • Nicolai Bache,
  • Amalia Apalategui,
  • Markus Lubeck,
  • Sabrina Richter,
  • David S Fischer,
  • Oliver Raether,
  • Melvin A Park,
  • Florian Meier,
  • Fabian J Theis,
  • Matthias Mann

DOI
https://doi.org/10.15252/msb.202110798
Journal volume & issue
Vol. 18, no. 3
pp. n/a – n/a

Abstract

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Abstract Single‐cell technologies are revolutionizing biology but are today mainly limited to imaging and deep sequencing. However, proteins are the main drivers of cellular function and in‐depth characterization of individual cells by mass spectrometry (MS)‐based proteomics would thus be highly valuable and complementary. Here, we develop a robust workflow combining miniaturized sample preparation, very low flow‐rate chromatography, and a novel trapped ion mobility mass spectrometer, resulting in a more than 10‐fold improved sensitivity. We precisely and robustly quantify proteomes and their changes in single, FACS‐isolated cells. Arresting cells at defined stages of the cell cycle by drug treatment retrieves expected key regulators. Furthermore, it highlights potential novel ones and allows cell phase prediction. Comparing the variability in more than 430 single‐cell proteomes to transcriptome data revealed a stable‐core proteome despite perturbation, while the transcriptome appears stochastic. Our technology can readily be applied to ultra‐high sensitivity analyses of tissue material, posttranslational modifications, and small molecule studies from small cell counts to gain unprecedented insights into cellular heterogeneity in health and disease.

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