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Metabolic Flux Estimation-A Self-Adaptive Evolutionary Algorithm with Singular Value Decomposition

Published: 01 January 2007 Publication History

Abstract

Metabolic flux analysis is important for metabolic system regulation and intracellular pathway identification. A popular approach for intracellular flux estimation involves using ^{13}{\rm C} tracer experiments to label states that can be measured by nuclear magnetic resonance spectrometry or gas chromatography mass spectrometry. However, the bilinear balance equations derived from ^{13}{\rm C} tracer experiments and the noisy measurements require a nonlinear optimization approach to obtain the optimal solution. In this paper, the flux quantification problem is formulated as an error-minimization problem with equality and inequality constraints through the ^{13}{\rm C} balance and stoichiometric equations. The stoichiometric constraints are transformed to a null space by singular value decomposition. Self-adaptive evolutionary algorithms are then introduced for flux quantification. The performance of the evolutionary algorithm is compared with ordinary least squares estimation by the simulation of the central pentose phosphate pathway. The proposed algorithm is also applied to the central metabolism of Corynebacterium glutamicum under lysine-producing conditions. A comparison between the results from the proposed algorithm and data from the literature is given. The complexity of a metabolic system with bidirectional reactions is also investigated by analyzing the fluctuations in the flux estimates when available measurements are varied.

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  • (2012)Parameter Estimation Using Metaheuristics in Systems BiologyIEEE/ACM Transactions on Computational Biology and Bioinformatics10.1109/TCBB.2011.639:1(185-202)Online publication date: 1-Jan-2012

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Published In

cover image IEEE/ACM Transactions on Computational Biology and Bioinformatics
IEEE/ACM Transactions on Computational Biology and Bioinformatics  Volume 4, Issue 1
January 2007
160 pages

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IEEE Computer Society Press

Washington, DC, United States

Publication History

Published: 01 January 2007
Published in TCBB Volume 4, Issue 1

Author Tags

  1. Evolutionary computing
  2. least squares method
  3. metabolic flux analysis
  4. singular value decomposition.

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  • (2012)Parameter Estimation Using Metaheuristics in Systems BiologyIEEE/ACM Transactions on Computational Biology and Bioinformatics10.1109/TCBB.2011.639:1(185-202)Online publication date: 1-Jan-2012

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