Symbiose Project Team - INRIA/Irisa © 2007 - 2008

Jeudi 3 Février, Elisabetta De Maria, INRIA Rocquencourt |

Written by Pierre PETERLONGO | |

## Computer Science Logic for Structure Prediction, String Comparison, and Model Coupling.10h30 Salle AurignyFormal methods of Computer Science are more and more applied to the study of biological issues. In literature, they are extensively used to model and simulate biological systems and to express formal properties of such systems. In the talk I'll show how model checking, game theory, and the combination of temporal logic and parameter learning techniques can be exploited to develop effective solutions to three relevant classes of biological problems: the protein structure prediction and protein folding problems, the sequence comparison problems, and the problems of coupling biological models and validating the resulting model. As for the protein structure prediction and protein folding problems, we model the space of protein conformations as a finite transition system whose states are all the possible conformations of a protein and whose transitions represent admissible transformations of conformations. Then, we show how meaningful properties of such a transition system can be expressed in temporal logic and we use the model checking machinery to algorithmically check them. As for the sequence comparison problems, we model biological sequences as labeled structures with a "limited order" relation and we define a criterion which allows one to measure their degree of similarity in terms of the number of remaining rounds in an Ehrenfeucht-Fraissé game played on such structures. Finally, as for the last issue is concerned, we study the coupling of different models playing a role in the mammalian cell cycle and in cancer therapies. We show how the formalization of experimental observations in temporal logic with numerical constraints can be used to automatically validate a coupled model and optimize unknown parameter values with respect to experimental data. We illustrate this constraint-based approach through the coupling of existing biochemical models of the mammalian cell cycle, the circadian clock, the p53/Mdm2 DNA-damage repair system, and irinotecan metabolism. |

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