Читать книгу Algorithms in Bioinformatics - Paul A. Gagniuc - Страница 51

A third hypothesis for the origin of multicellularity suggests an early unicellular organism that underwent repeated divisions with incomplete separations between generations, which further led to a forced cooperation and specialization for a primitive tissue formation. Plant embryos and animal embryos adhere to this behavior. More to the point, the eukaryotic microorganism Saccharomyces cerevisiae (the budding yeast) is an ideal example for this hypothesis [158]. Yeast colonies growing on solid media show specific structural patterns in their three-dimensional multicellular organization. These structural patterns are specific to each yeast strain [159]. Moreover, variations in the multicellular organization appear to be dependent on the environmental parameters, such as the position of surrounding cells, nutrient gradients, temperature, and so on [160].