Evaluating False Transfer Rates from the Match-Between-Runs algorithm with a two-proteome model
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ABSTRACT: Stochasticity between independent LC-MS/MS runs is a challenging problem in the field of proteomics resulting in significant missing values (i.e., abundance measurements) among observed peptides. To address this issue, several approaches have been developed including computational methods such as MaxQuant’s Match-Between-Runs (MBR) algorithm. Often dozens of runs are all considered at once by MBR, transferring identifications from any one run to any of the others. To evaluate the error associated with these transfer events, we created a two-sample/two-proteome approach. In this way, samples containing no yeast lysates were assessed for false identification transfers from samples containing yeast. Overall, transfers from any of 20 runs with yeast were assessed to any of 20 runs without yeast were measured. While MBR increased the total number of spectral identifications by ~40%, we also found that 44% of all identified yeast proteins had identifications transferred to at least one sample without yeast. However, of these only 2.7% remained in the final dataset after applying the MaxQuant LFQ algorithm. We conclude that false transfers by MBR are plentiful, but likely have only a small impact on the final dataset due to downstream removal.
INSTRUMENT(S): Orbitrap Fusion Lumos
ORGANISM(S): Homo Sapiens (human) Saccharomyces Cerevisiae (baker's Yeast)
SUBMITTER: Joao Paulo
LAB HEAD: Steven P. Gygi
PROVIDER: PXD014415 | Pride | 2019-09-25
REPOSITORIES: Pride
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