Biological complexity: bacterial controlled clumps (Introduction)

by David Turell , Thursday, August 13, 2020, 01:14 (1346 days ago) @ David Turell

A very strange bacterial multicellular activity:

https://www.sciencedaily.com/releases/2020/08/200812094849.htm

"Research has revealed that multicellular physiology in the social bacterium Myxococcus xanthus--a bacterium that can actively reorganize its community according to the environment in which it is found -- is modulated by the secretion of two natural sugar polymers in separate zones of a swarm.

***

"Professor Salim Timo Islam has been carrying out research in bacterial physiology for four years, focusing on the interactions of bacterial cells with each other, as well as with underlying surfaces. Along with his PhD student Fares Saïdi, they are investigating the origins of multicellularity. More precisely, their work revolves around the factors that allow cells to multiply, specialize, communicate, interact, and move. These behaviours are all associated with multicellularity as they promote the expansion of a community of cells and the formation of complex structures.

"Their research has characterized two compounds contributing to multicellularity and the distinct areas of production, for each, within a community. Exopolysaccharide (EPS) is produced more by cells at the periphery of the swarm. Production of the second sugar polymer, a novel biosurfactant (BPS), is enriched toward the centre of the swarm. "Since the factors contributing to the development of bacterial communities remain poorly understood, it is very exciting to have identified another," mentions Professor Islam, a specialist in microbial biochemistry and co-first author of the study along with his PhD student Fares Saïdi.

"Multicellularity is typically associated with organisms such as fungi, plants, and animals. As part of this study, the researchers studied the basis for this evolutionary transition on a smaller scale: the bacterium Myxococcus xanthus. This organism has the distinction of being able to reorganize the structure of its population, allowing it to react to different environmental signals and even eat other bacteria.

"In response to a hostile environment, such as in instances of nutrient deficiency, this bacterium directs its homogenous population to specialize into three subtypes of cells. These communities thus form 3-dimensional structures, visible to the naked eye. It is thanks to this multicellular lifestyle that they ensure the survival of their community."

Comment: multicellularity had to start somehow. This is group action. Amoeba also have similar activities. Designed by God?