A purely mechanical model with asymmetric features for early morphogenesis of rod-shaped bacteria micro-colony

Marie Doumic (1) , Sophie Hecht (1) , Diane Peurichard (1)

1 MAMBA - Modelling and Analysis for Medical and Biological Applications

To model the morphogenesis of rod-shaped bacterial micro-colony, several individual-based models have been proposed in the biophysical literature. When studying the shape of micro-colonies, most models present interaction forces such as attraction or filial link. In this article, we propose a model where the bacteria interact only through non-overlapping constraints. We consider the asymmetry of the bacteria, and its influence on the friction with the substrate. Besides, we consider asymmetry in the mass distribution of the bacteria along their length. These two new modelling assumptions allow us to retrieve mechanical behaviours of micro-colony growth without the need of interaction such as attraction. We compare our model to various sets of experiments, discuss our results, and propose several quantifiers to compare model to data in a systematic way.

Mots clés: Individual-based model; Asymmetric friction; Micro-colony morphogenesis; Rod-shaped bacteria

Domaines: Analyse numérique [math.NA]; Bactériologie; Mécanique des solides [physics.class-ph]

Marie Doumic, Sophie Hecht, Diane Peurichard. A purely mechanical model with asymmetric features for early morphogenesis of rod-shaped bacteria micro-colony. Mathematical Biosciences and Engineering, 2020, 17 (6), http://aimspress.com/article/doi/10.3934/mbe.2020356. ⟨10.3934/mbe.2020356⟩. ⟨hal-02865566⟩