Network reconstruction of the mouse secretory pathway applied on CHO cell transcriptome data

Anne Mathilde Lund, Christian Schrøder Kaas, Julian Brandl, Lasse Ebdrup Pedersen, Helene Faustrup Kildegaard, Claus Kristensen, Mikael Rørdam Andersen

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Background: Protein secretion is one of the most important processes in eukaryotes. It is based on a highly complex machinery involving numerous proteins in several cellular compartments. The elucidation of the cell biology of the secretory machinery is of great importance, as it drives protein expression for biopharmaceutical industry, a 140 billion USD global market. However, the complexity of secretory process is difficult to describe using a simple reductionist approach, and therefore a promising avenue is to employ the tools of systems biology. 
Results: On the basis of manual curation of the literature on the yeast, human, and mouse secretory pathway, we have compiled a comprehensive catalogue of characterized proteins with functional annotation and their interconnectivity. Thus we have established the most elaborate reconstruction (RECON) of the functional secretion pathway network to date, counting 801 different components in mouse. By employing our mouse RECON to the CHO-K1 genome in a comparative genomic approach, we could reconstruct the protein secretory pathway of CHO cells counting 764 CHO components. This RECON furthermore facilitated the development of three alternative methods to study protein secretion through graphical visualizations of omics data. We have demonstrated the use of these methods to identify potential new and known targets for engineering improved growth and IgG production, as well as the general observation that CHO cells seem to have less strict transcriptional regulation of protein secretion than healthy mouse cells. 
Conclusions: The RECON of the secretory pathway represents a strong tool for interpretation of data related to protein secretion as illustrated with transcriptomic data of Chinese Hamster Ovary (CHO) cells, the main platform for mammalian protein production.
Original languageEnglish
Article number37
JournalB M C Systems Biology
Issue number1
Number of pages17
Publication statusPublished - 2017

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© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0
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  • Chinese hamster ovary cells
  • Pathway reconstruction
  • Protein secretion
  • RNA-Seq
  • Secretion pathway

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