Recent Advances in Computational Methods for Data Analysis in Untargeted Mass-Spectrometry Based Metabolomics

A special issue of Metabolites (ISSN 2218-1989). This special issue belongs to the section "Bioinformatics and Data Analysis".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 2662

Special Issue Editors


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Guest Editor
Laboratório de FTICR e Espectrometria de Massa Estrutural, MARE-Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
Interests: systems biology; metabolomics; omics data analysis; kinetic modeling of cellular systems, computational biochemistry

E-Mail Website
Guest Editor
Laboratório de FTICR e Espectrometria de Massa Estrutural, MARE-Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
Interests: metabolomics; chemical profile of grapevine and wine; identification of biomarkers of disease resistance through extreme resolution mass spectrometry-based metabolomics

E-Mail Website
Guest Editor
Laboratório de FTICR e Espectrometria de Massa Estrutural, MARE-Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
Interests: fourier transform-ion-cyclotron resonance mass spectrometry; protein and PTM characterization; native MS; metabolomics

Special Issue Information

Dear Colleagues,

The emergence of analytical platforms that achieved unprecedent sensitivity, resolution, and mass accuracy projected mass-spectrometry-based metabolomics  to a remarkable development in recent years, leading to an increase in reliability and coverage in the analysis of complex samples, ranging from environmental organic matter to biological materials.

In any metabolomics workflow, but particularly applied to untargeted approaches, data analysis is one of the most critical stages, due to the inherent complexity of the methodology. The continuous increase in this complexity, fostered by the evolution of instrumental and analytical techniques, brings new challenges to data analysis, and the development of new methods is paramount to follow up with analytical progress. In this context, the time is right to develop new computational methods of metabolomics data analysis to take full advantage of the increase in analytical performance. Therefore, this Special Issue of Metabolites will be dedicated to current advances in the development of data analysis methods, encompassing various aspects of the metabolomics workflow: analysis of raw instrumental signals, spectral feature processing, hyphenated methods’ annotations, spectra alignment, data pretreatment and preprocessing, deep learning and other machine learning methods, data representation and visualization, information extraction, and multiomics integration.

Prof. Dr. António Ferreira
Dr. Marta Sousa Silva
Dr. Carlos Cordeiro
Guest Editors

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Keywords

  • metabolomics data analysis
  • mass-spectrometry-based metabolomics
  • signal processing
  • spectral feature annotation
  • machine learning in metabolomics
  • multiomics integration
  • computational methods
  • untargeted metabolomics

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Published Papers (1 paper)

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Research

15 pages, 3194 KiB  
Article
Imputation of Missing Values for Multi-Biospecimen Metabolomics Studies: Bias and Effects on Statistical Validity
by Machelle D. Wilson, Matthew D. Ponzini, Sandra L. Taylor and Kyoungmi Kim
Metabolites 2022, 12(7), 671; https://doi.org/10.3390/metabo12070671 - 21 Jul 2022
Cited by 5 | Viewed by 2041
Abstract
The analysis of high-throughput metabolomics mass spectrometry data across multiple biological sample types (biospecimens) poses challenges due to missing data. During differential abundance analysis, dropping samples with missing values can lead to severe loss of data as well as biased results in group [...] Read more.
The analysis of high-throughput metabolomics mass spectrometry data across multiple biological sample types (biospecimens) poses challenges due to missing data. During differential abundance analysis, dropping samples with missing values can lead to severe loss of data as well as biased results in group comparisons and effect size estimates. However, the imputation of missing data (the process of replacing missing data with estimated values such as a mean) may compromise the inherent intra-subject correlation of a metabolite across multiple biospecimens from the same subject, which in turn may compromise the efficacy of the statistical analysis of differential metabolites in biomarker discovery. We investigated imputation strategies when considering multiple biospecimens from the same subject. We compared a novel, but simple, approach that consists of combining the two biospecimen data matrices (rows and columns of subjects and metabolites) and imputes the two biospecimen data matrices together to an approach that imputes each biospecimen data matrix separately. We then compared the bias in the estimation of the intra-subject multi-specimen correlation and its effects on the validity of statistical significance tests between two approaches. The combined approach to multi-biospecimen studies has not been evaluated previously even though it is intuitive and easy to implement. We examine these two approaches for five imputation methods: random forest, k nearest neighbor, expectation-maximization with bootstrap, quantile regression, and half the minimum observed value. Combining the biospecimen data matrices for imputation did not greatly increase efficacy in conserving the correlation structure or improving accuracy in the statistical conclusions for most of the methods examined. Random forest tended to outperform the other methods in all performance metrics, except specificity. Full article
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