Two data pre‑processing workflows to facilitate the discovery of biomarkers by 2D NMR metabolomics

[en] Abstract Introduction The pre-processing of analytical data in metabolomics must be considered as a whole to allow the construction of a global and unique object for any further simultaneous data analysis or multivariate statistical modelling. For 1D 1H-NMR metabolomics experiments, best practices for data pre-processing are well defined, but not yet for 2D experiments (for instance COSY in this paper). Objective By considering the added value of a second dimension, the objective is to propose two workflows dedicated to 2D NMR data handling and preparation (the Global Peak List and Vectorization approaches) and to compare them (with respect to each other and with 1D standards). This will allow to detect which methodology is the best in terms of amount of metabolomic content and to explore the advantages of the selected workflow in distinguishing among treatment groups and identifying relevant biomarkers. Therefore, this paper explores both the necessity of novel 2D pre-processing workflows, the evaluation of their quality and the evaluation of their performance in the subsequent determination of accurate (2D) biomarkers. Methods To select the more informative data source, MIC (Metabolomic Informative Content) indexes are used, based on clustering and inertia measures of quality. Then, to highlight biomarkers or critical spectral zones, the PLS-DA model is used, along with more advanced sparse algorithms (sPLS and L-sOPLS). Results Results are discussed according to two different experimental designs (one which is unsupervised and based on human urine samples, and the other which is controlled and based on spiked serum media). MIC indexes are shown, leading to the choice of the more relevant workflow to use thereafter. Finally, biomarkers are provided for each case and the predictive power of each candidate model is assessed with cross-validated measures of RMSEP. Conclusion In conclusion, it is shown that no solution can be universally the best in every case, but that 2D experiments allow to clearly find relevant cross peak biomarkers even with a poor initial separability between groups. The MIC measures linked with the candidate workflows (2D GPL, 2D vectorization, 1D, and with specific parameters) lead to visualize which data set must be used as a priority to more easily find biomarkers. The diversity of data sources, mainly 1D versus 2D, may often lead to complementary or confirmatory results.

Disciplines :

Human health sciences: Multidisciplinary, general & others

Author, co-author :

Feraud, Baptiste

Leenders, Justine ; Université de Liège - ULiège > Département des sciences cliniques > Labo de biologie des tumeurs et du développement

Martineau, Estelle

Giraudeau, Patrick

Govaerts, Bernadette

De Tullio, Pascal ; Université de Liège - ULiège > CIRM > Metabolomics group

Language :

English

Title :

Two data pre‑processing workflows to facilitate the discovery of biomarkers by 2D NMR metabolomics

Publication date :

2019

Journal title :

Metabolomics

ISSN :

1573-3882

eISSN :

1573-3890

Publisher :

Springer, Germany

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 24 April 2019

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