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Robustness-based model validation of an apoptosis signalling network model
Schliemann, Monica; Findeisen, Rolf; Bullinger, Eric
2012In Proceedings of the 16th IFAC Symposium on System Identification, Brussels, Belgium, 11–13 July 2012
Peer reviewed
 

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Keywords :
polynomial models; robustness; perturbation analysis; biochemical systems
Abstract :
[en] Models of intracellular biochemical reaction networks are difficult to parameterise due to the low number of quantitative time series experimental values. Therefore, model validation or invalidation plays an important role, as it allows to check qualitatively whether a model structure is suited or not to reproduce qualitatively the experimental findings. This paper analyses the robustness of an experimentally validated polynomial differential equation model of TNF-induced pro-and anti-apoptotic signalling. The bistability of the median model is shown robust to large single parameter variations. Only two parameters (XIAP and Procaspase-3 production rates) are shown to be fragile, in particular when changed simultaneously. Therefore, the model seems valid from the point of view of robustness analysis of the bistability. Many biological experiments quantify average concentrations or the percentage of viable cells, while other methods such as microscopy-based experiments observe single cells. The integration of single cell and cell population behaviour of TNF-induced pro- and anti-apoptotic signalling has been achieved via a cell ensemble model, whose robustness is also analysed here. We show that within the cell population there are cells with not only quantitative differences, but also qualitative ones. In particular, all cells are not bistable. The degree of robustness applicable for the median cell is expanded to combine mono- and bistable models. This measure, applied solely to the two-dimensional subspace of fragile parameters, is shown to correlate well with the time of death. While robustness of bistability can serve for model validation of the median cell model, it cannot for the model of the cell population.
Research center :
Giga-Systems Biology and Chemical Biology - ULiège
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Schliemann, Monica ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes et modélisation : Méth. computat. pour la bio.syst.
Findeisen, Rolf
Bullinger, Eric ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes et modélisation : Méth. computat. pour la bio.syst.
Language :
English
Title :
Robustness-based model validation of an apoptosis signalling network model
Publication date :
2012
Event name :
16th IFAC Symposium on System Identification
Event place :
Brussels, Belgium
Event date :
from 11-07-2012 to 13-07-2012
Audience :
International
Main work title :
Proceedings of the 16th IFAC Symposium on System Identification, Brussels, Belgium, 11–13 July 2012
Pages :
930–935
Peer reviewed :
Peer reviewed
Available on ORBi :
since 13 August 2012

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