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Optimization of auto-induction medium for G-CSF production by Escherichia coli using artificial neural networks coupled with genetic algorithm

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Abstract

Granulocyte colony-stimulating factor (G-CSF) is a cytokine widely used in cancer patients receiving high doses of chemotherapeutic drugs to prevent the chemotherapy-induced suppression of white blood cells. The production of recombinant G-CSF should be increased to meet the increasing market demand. This study aims to model and optimize the carbon source of auto-induction medium to enhance G-CSF production using artificial neural networks coupled with genetic algorithm. In this approach, artificial neural networks served as bioprocess modeling tools, and genetic algorithm (GA) was applied to optimize the established artificial neural network models. Two artificial neural network models were constructed: the back-propagation (BP) network and the radial basis function (RBF) network. The root mean square error, coefficient of determination, and standard error of prediction of the BP model were 0.0375, 0.959, and 8.49 %, respectively, whereas those of the RBF model were 0.0257, 0.980, and 5.82 %, respectively. These values indicated that the RBF model possessed higher fitness and prediction accuracy than the BP model. Under the optimized auto-induction medium, the predicted maximum G-CSF yield by the BP-GA approach was 71.66 %, whereas that by the RBF-GA approach was 75.17 %. These predicted values are in agreement with the experimental results, with 72.4 and 76.014 % for the BP-GA and RBF-GA models, respectively. These results suggest that RBF-GA is superior to BP-GA. The developed approach in this study may be helpful in modeling and optimizing other multivariable, non-linear, and time-variant bioprocesses.

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Acknowledgments

This work has been supported by the Fundamental Research Funds for the Central Universities (Program No. JKQ2011043), Jiangsu 333 High-level Talents Cultivating Program and Qing Lan Projects.

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Authors and Affiliations

  1. State Key Laboratory of Natural Medicines, College of Life Science and Technology, China Pharmaceutical University, Nanjing, 210009, China

    H. Tian, C. Liu, X. D. Gao & W. B. Yao

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  1. H. Tian
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  2. C. Liu
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  3. X. D. Gao
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  4. W. B. Yao
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Correspondence to W. B. Yao.

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H. Tian, and C. Liu contributed equally to this paper.

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Tian, H., Liu, C., Gao, X.D. et al. Optimization of auto-induction medium for G-CSF production by Escherichia coli using artificial neural networks coupled with genetic algorithm. World J Microbiol Biotechnol 29, 505–513 (2013). https://doi.org/10.1007/s11274-012-1204-1

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