Publication — IRIC

Proteogenomics and Differential Ion Mobility Enable the Exploration of the Mutational Landscape in Colon Cancer Cells.

The sensitivity and depth of proteomic analyses are limited by isobaric ions and interferences that preclude the identification of low abundance peptides. Extensive sample fractionation is often required to extend proteome coverage when sample amount is not a limitation. Ion mobility devices provide a viable alternate approach to resolve confounding ions and improve peak capacity and mass spectrometry (MS) sensitivity. Here, we report the integration of differential ion mobility with segmented ion fractionation (SIFT) to enhance the comprehensiveness of proteomic analyses. The combination of differential ion mobility and SIFT, where narrow windows of ∼m/z 100 are acquired in turn, is found particularly advantageous in the analysis of protein digests and typically provided more than 60% gain in identification compared to conventional single-shot LC-MS/MS. The application of this approach is further demonstrated for the analysis of tryptic digests from different colorectal cancer cell lines where the enhanced sensitivity enabled the identification of single amino acid variants that were correlated with the corresponding transcriptomic data sets.

Publication date
September 6, 2022
Principal Investigators
Wu Z, Bonneil E, Belford M, Boeser C, Ruiz Cuevas MV, Lemieux S, Dunyach JJ, Thibault P
PubMed reference
Anal Chem 2022;94(35):12086-12094
PubMed ID
35995421
Affiliation
Institute for Research in Immunology and Cancer (IRIC), Université de Montréal, Montréal, Quebec 514 343-6910, Canada.