Significance estimation for large scale metabolomics annotations by spectral matching.

Significance estimation for large scale metabolomics annotations by spectral matching.
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DOI:
10.1038/s41467-017-01318-5
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发表时间:
2017-11-14
影响因子:
16.6
通讯作者:
Böcker S
Böcker S
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Scheubert K;Hufsky F;Petras D;Wang M;Nothias LF;Dührkop K;Bandeira N;Dorrestein PC;Böcker S

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The annotation of small molecules in untargeted mass spectrometry relies on the matching of fragment spectra to reference library spectra. While various spectrum-spectrum match scores exist, the field lacks statistical methods for estimating the false discovery rates (FDR) of these annotations. We present empirical Bayes and target-decoy based methods to estimate the false discovery rate (FDR) for 70 public metabolomics data sets. We show that the spectral matching settings need to be adjusted for each project. By adjusting the scoring parameters and thresholds, the number of annotations rose, on average, by +139% (ranging from −92 up to +5705%) when compared with a default parameter set available at GNPS. The FDR estimation methods presented will enable a user to assess the scoring criteria for large scale analysis of mass spectrometry based metabolomics data that has been essential in the advancement of proteomics, transcriptomics, and genomics science. Matching fragment spectra to reference library spectra is an important procedure for annotating small molecules in untargeted mass spectrometry based metabolomics studies. Here, the authors develop strategies to estimate false discovery rates (FDR) by empirical Bayes and target-decoy based methods which enable a user to define the scoring criteria for spectral matching.
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