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Molecular BioSystems Vol - 13 Issue - 4

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Prediction of metabolic fluxes from gene expression data with Huber penalty convex optimization function

Content Provider	Royal Society of Chemistry (RSC)
Author	Gou, Wang-Long Li, Yan Zhang, Shao-Wu
Copyright Year	2017
Abstract	As one of the critical parameters of a metabolic pathway, the metabolic flux in a metabolic network serves as an essential role in physiology and pathology. Constraint-based metabolic models are the widely used frameworks for predicting metabolic fluxes in genome-scale metabolic networks. Integrating the transcriptomic data into the constraint-based metabolic models can effectively predict context-specific fluxes across different conditions. However, these methods always need user-defined thresholds to identify the expression levels of metabolic genes or restrain the rate of biomass production, and the predictive results are sensitive to the thresholds. In this work, we present the Huber penalty convex optimization function (HPCOF) combined with the flux minimization principle to predict metabolic fluxes. Our HPCOF method integrates gene expression profiles into the genome-scale metabolic models (GEMs) to reduce the sensitivity to outliers, and uses continuous expression data to avoid selection of arbitrary threshold parameters. In the case studies of Saccharomyces cerevisiae (S. cerevisiae) and Escherichia coli (E. coli) strains under different conditions, the results show that our HPCOF method has a better fit to the experimentally measured values, and has a higher Pearson correlation coefficient, a smaller P-value and a lower sum of squared error than other methods. The HPCOF code can be freely downloaded from https://github.com/nwpu903/HPCOF for academic users.
Starting Page	901
Ending Page	909
Page Count	9
File Format	HTM / HTML PDF
ISSN	1742206X
Volume Number	13
Issue Number	5
Journal	Molecular BioSystems
DOI	10.1039/c6mb00811a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Metabolic network Escherichia coli Metabolic pathway Biomass Huber Pathology Pearson product-moment correlation coefficient Pearson Flux (metabolism) Gene Convex optimization Physiology Saccharomyces cerevisiae P-value
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Biotechnology

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Prediction of metabolic fluxes from gene expression data with Huber penalty convex optimization function

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