SeMoVi - 090610 Robin Charles — BioSyL - Réseau de Biologie Systémique de l'Université de Lyon

14h00 - 15h00	Stéphane Robin, AgroParisTech / INRA Using "null" models to study biological networks
15h00 - 15h30	Pause café
15h30 - 16h30	Hubert Charles, INSA de LYON Exploring the regulatory network of Buchnera aphidicola, a case-study of genome evolution in a symbiotic context
16h30 - 17h00	Discussion générale

Stéphane Robin, AgroParisTech / INRA
Using "null" models to study biological networks

Network analysis is now one of the most active parts of computational biology. Most methods refer to some modelling of the network(s) under study, although the meaning of `modelling' varies quite a lot. In this talk, we will present some methods where the model is neither a mechanistic description of how the network behaves, nor a realistic description of the way it has been build. `Null' models can be seen as naive and yet reasonably faithful descriptions of what is observed. Such a model must account for some information, and enable us to discover some other information. We will consider the problem of motif detection in interaction or metabolic network. We will present several random graph models that can be used as null models. We will then show how they can be used to detect exceptional patterns in a network, or to compare networks based on patterns frequencies.

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SeMoVi - 090610 Robin Charles