Abstract
Metabolomics is currently an important field within bioanalytical science and NMR has become a key technique for drawing the full metabolic picture. However, the analysis of 1H NMR spectra of metabolomics samples is often very challenging, as resonances usually overlap in crowded regions, hindering the steps of metabolite profiling and resonance integration. In this context, a pre-processing method for the analysis of 1D 1H NMR data from metabolomics samples is proposed, consisting of the blind resolution and integration of all resonances of the spectral dataset by multivariate curve resolution-alternating least squares (MCR-ALS). The resulting concentration estimates can then be examined with traditional chemometric methods such as principal component analysis (PCA), ANOVA-simultaneous component analysis (ASCA), and partial least squares-discriminant analysis (PLS-DA). Since MCR-ALS does not require the use of spectral templates, the concentration estimates for all resonances are obtained even before being assigned. Consequently, the metabolomics study can be performed without neglecting any relevant resonance. In this work, the proposed pipeline performance was validated with 1D 1H NMR spectra from a metabolomics study of zebrafish upon acrylamide (ACR) exposure. Remarkably, this method represents a framework for the high-throughput analysis of NMR metabolomics data that opens the way for truly untargeted NMR metabolomics analyses.
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Data availability
The data is available upon request.
Abbreviations
- 1D 1H NMR:
-
One-dimensional proton nuclear magnetic resonance
- AAMA:
-
N-Acetyl-S-(carbamoylethyl)-L-cysteine
- ACR:
-
Acrylamide
- ANOVA:
-
Analysis of variance
- ASCA:
-
ANOVA-simultaneous component analysis
- AXP:
-
Adenosine nucleotides
- BATMAN:
-
Bayesian automated metabolite analyzer for NMR
- C:
-
Concentrations matrix in the MCR-ALS analysis
- D:
-
Input matrix in the MCR-ALS analysis
- DSS:
-
2,2-Dimethyl-2-silapentane-5-sulfonate
- GABA:
-
Gamma-aminobutyric acid
- GUI:
-
Graphical user interface
- MCR-ALS:
-
Multivariate curve resolution-alternating least squares
- NMR:
-
Nuclear magnetic resonance
- NOESY:
-
Nuclear Overhauser Effect SpectroscopY
- PC1:
-
First principal component
- PC2:
-
Second principal component
- PCA:
-
Principal component analysis
- PLS-DA:
-
Partial least squares-discriminant analysis
- PQN:
-
Probabilistic quotient normalization
- SCA:
-
Simultaneous component analysis
- ST :
-
Spectrum matrix in the MCR-ALS analysis
- SVD:
-
Single value decomposition
- UDP:
-
Uridine diphosphate
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Code availability
The MCR-ALS GUI can be downloaded from www.mcrals.info.
Funding
The research leading to these results has received funding from the NATO SfP project MD.SFPP 984777.
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B Piña and D Raldúa designed the experiments. M Casado and Y Pérez performed the experiments. F Puig-Castellví performed the chemometric analysis. All authors have contributed in the manuscript writing and have given approval to its final version.
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All procedures were approved by the Institutional Animal Care and Use Committees at the CID-CSIC and conducted in accordance with the institutional guidelines under a license from the local government (agreement number 9027).
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Pérez, Y., Casado, M., Raldúa, D. et al. MCR-ALS analysis of 1H NMR spectra by segments to study the zebrafish exposure to acrylamide. Anal Bioanal Chem 412, 5695–5706 (2020). https://doi.org/10.1007/s00216-020-02789-0
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DOI: https://doi.org/10.1007/s00216-020-02789-0