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PLS-SEM Mediation Analysis of Gene-Expression Data for the Evaluation of a Drug Effect

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Computational Intelligence Methods for Bioinformatics and Biostatistics (CIBB 2016)

Part of the book series: Lecture Notes in Computer Science ((LNBI,volume 10477))

Abstract

Gene expression analysis can unveil the genes associated with the molecular action of a drug. However, it is not always clear how the differentially expressed genes restore the phenotype and whether, globally, the drug has an effect on the disease. We propose a method that exploits gene-expression data and network biology information to build a mediation analysis model for the evaluation of the effect of treatment on the disease at molecular level. First, differentially expressed genes (DEGs) associated to the drug and the disease are discovered. Then, based on a pathway analysis, shortest paths between drug DEGs and disease DEGs are obtained. This allows discovering the mediator genes that connect drug genes to disease genes. The expression values of the three sets of genes are used to conduct a mediation analysis that evaluates the effect of the drug on the disease. The effect could be direct, indirect by mediators, or both. The latent variables and mediation model are constructed by using the PLS-SEM. The procedure is applied to a real example concerning the effect of abacavir on HIV samples. The proposed pipeline can offer an additional tool for the understanding of the etiology of a disease and unveiling the mechanisms of action of a drug at gene level.

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Acknowledgement

This research was funded by the MIMOmics grant of the European Union’s Seventh Framework Programme (FP7-Health-F5-2012) under the grant agreement number 305280.

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Authors and Affiliations

  1. I-BioStat, Hasselt University, Campus Diepenbeek, Hasselt, Belgium

    Daniele Pepe & Tomasz Burzykowski

Authors
  1. Daniele Pepe
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  2. Tomasz Burzykowski
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Corresponding author

Correspondence to Daniele Pepe .

Editor information

Editors and Affiliations

  1. Computing Science and Mathematics, University of Stirling, Stirling, United Kingdom

    Andrea Bracciali

  2. School of Informatics, University of Edinburgh, Edinburgh, United Kingdom

    Giulio Caravagna

  3. Department of Computer Science, Brunel University London, Uxbridge, Middlesex, United Kingdom

    David Gilbert

  4. Department of Management and Innovation Systems DISA-MIS, University of Salerno, Fisciano, Italy

    Roberto Tagliaferri

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Pepe, D., Burzykowski, T. (2017). PLS-SEM Mediation Analysis of Gene-Expression Data for the Evaluation of a Drug Effect. In: Bracciali, A., Caravagna, G., Gilbert, D., Tagliaferri, R. (eds) Computational Intelligence Methods for Bioinformatics and Biostatistics. CIBB 2016. Lecture Notes in Computer Science(), vol 10477. Springer, Cham. https://doi.org/10.1007/978-3-319-67834-4_5

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  • DOI: https://doi.org/10.1007/978-3-319-67834-4_5

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-67833-7

  • Online ISBN: 978-3-319-67834-4

  • eBook Packages: Computer ScienceComputer Science (R0)

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