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© Inria / Photo C. Morel
Quantitative biology: numbers and fluorescent cells. InBio team (Inria/Institut Pasteur)
Publication : IEEE European Control Conference (ECC’19)

Can optimal experimental design serve as a tool to characterize highly non-linear synthetic circuits?

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in IEEE European Control Conference (ECC’19) - 25 Jun 2019

Maxim Kryukov, Arthur Carcano, Grégory Batt, and Jakob Ruess

ECC 2019, pp. 1176-1181

One of the most crippling problems in quantitative and synthetic biology is that models aiming to describe the real mechanisms of biochemical processes inside cells typically contain too many unknown parameters to be reliably inferable from available experimental data. Recent years, however, have seen immense progress in the development of experimental platforms that allow not only to measure biological systems more precisely but also to administer external control inputs to the cells. Optimal experimental design has been identified as a tool that can be used to decide how to best choose these control inputs so as to excite the systems in ways that are particularly useful for learning the biochemical rate constants from the corresponding data. Unfortunately, the experiment that is best to learn the parameters of a system depends on the precise values of these parameters, which are naturally unknown at the time at which experiments need to be designed. In this paper, we use a recently constructed genetic toggle switch as a case study to investigate how close to the best possible experiment we can hope to get with the most widely used optimal design approaches in the field. We find that, for strongly nonlinear systems such as the toggle switch, reliably predicting the information that can be gained from a priori fixed experiments can be difficult if the system parameters are not known very precisely. This suggests that a better strategy to guarantee informative experiments might be to use feedback control and to adjust the experimental plan in real time.

https://hal.inria.fr/hal-02304425