De novo origins of multicellularity in response to predation
De novo origins of multicellularity in response to predation
复制标题
DOI：
10.1038/s41598-019-39558-8
复制
发表时间：
2019-02-20
影响因子：
4.6
通讯作者：
Ratcliff, William C.
中科院分区：
文献类型：
--
作者：
Herron, Matthew D.;Borin, Joshua M.;Ratcliff, William C.
从单细胞生命到多细胞生命的转变是生命史上为数不多的重大事件之一，为更复杂的生物系统的进化创造了新的机会。捕食被假设为一种选择压力，可能推动了多细胞生物的进化。在这里，我们表明，从头起源的简单的多细胞生物可以进化的捕食。我们进行了异交种群的单细胞绿色衣藻莱茵衣藻选择过滤器喂养的捕食草履虫tetraurelia。五个实验种群中有两个进化出多细胞结构，而在750个无性世代内没有观察到这种结构。进化的多细胞生活史中存在相当大的变化，细胞数量和繁殖体的大小不同的菌株。生存分析表明，进化的多细胞性状提供有效的保护，防止捕食。这些结果支持了这样的假设，即捕食者施加的选择可能在多细胞生物的某些起源中发挥了作用。
The transition from unicellular to multicellular life was one of a few major events in the history of life that created new opportunities for more complex biological systems to evolve. Predation is hypothesized as one selective pressure that may have driven the evolution of multicellularity. Here we show that de novo origins of simple multicellularity can evolve in response to predation. We subjected outcrossed populations of the unicellular green alga Chlamydomonas reinhardtii to selection by the filter-feeding predator Paramecium tetraurelia. Two of five experimental populations evolved multicellular structures not observed in unselected control populations within similar to 750 asexual generations. Considerable variation exists in the evolved multicellular life cycles, with both cell number and propagule size varying among isolates. Survival assays show that evolved multicellular traits provide effective protection against predation. These results support the hypothesis that selection imposed by predators may have played a role in some origins of multicellularity.