SWATH mass spectrometry applied to cerebrospinal fluid differential proteomics: establishment of a sample-specific method

Sandra I. Anjo, Cátia Santa, Bruno Manadas*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

Mass spectrometry (MS) has become the gold standard method for proteomics by allowing the simultaneous identification and/or quantification of thousands of proteins of a given sample. Over time, mass spectrometry has evolved into newer quantitative approaches with increased sensitivity and accuracy, such as the sequential windows acquisition of all theoretical fragment-ion spectra (SWATH)-MS approach. Moreover, in the past few years, some improvements were made in the SWATH-acquisition algorithm, allowing the design of sample-customized acquisition methods by adjusting the Q1 windows’ width in order to reduce it in the most populated m/z regions. This customization results in an increase in the specificity and a reduction in the interferences, ultimately leading to an improvement in the amount of quantitative data extracted to eventually increase the proteome coverage. These improvements are especially relevant for clinical neuroproteomics, which is mainly based on the analysis of circulatory biofluids, in particular the cerebrospinal fluid (CSF) due to its close connection with the brain. In the present chapter, a detailed description of the methodologies necessary to perform a whole-proteome relative quantification of CSF samples by SWATH-MS is presented, starting with the isolation of the protein fraction, its preparation for MS analysis, with all the necessary information for the design of a SWATH-MS method specific for each sample batch, and finally providing different methodologies for the analysis of the quantitative data obtained.
Original languageEnglish
Title of host publicationMethods in molecular biology
PublisherHumana Press Inc.
Pages169-189
Number of pages21
ISBN (Electronic)9781493997060
ISBN (Print)9781493997053
DOIs
Publication statusPublished - 2019
Externally publishedYes

Publication series

NameMethods in Molecular Biology
Volume2044
ISSN (Print)1064-3745
ISSN (Electronic)1940-6029

Keywords

  • CSF
  • SWATH-MS
  • Untargeted proteomics
  • Variable Q1 windows

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