Centrosome loss in the evolution of planarians.

Centrosome loss in the evolution of planarians.
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DOI:
10.1126/science.1214457
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发表时间:
2012-01-27
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Marshall WF
Marshall WF
中科院分区:
其他
文献类型:
--
作者:
Azimzadeh J;Wong ML;Downhour DM;Sánchez Alvarado A;Marshall WF

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中心体是由被微管组织基质包围的圆柱状中心粒形成的细胞质细胞器,是动物细胞的标志。中心体是保守的,对目前所描述的所有动物物种的发育都是必不可少的。在这里,我们展示了,与其他动物不同的是,平面动物以及可能还有其他扁虫完全没有中心体。我们发现,在浮游生物中,中心粒仅通过所谓的无着丝点路径在末端分化的纤毛细胞中组装,以触发纤毛的组装。这一独特的特征使我们能够识别动物中中心粒组装所需的一大组保守蛋白质,以及从脊椎动物基因组中缺失的中心体签名蛋白质。我们的研究揭示了动物中心体的分子结构和进化,并强调了动物细胞生物学和发育的可塑性。
The centrosome, a cytoplasmic organelle formed by cylinder-shaped centrioles surrounded by a microtubule-organizing matrix, is a hallmark of animal cells. The centrosome is conserved and essential for the development of all animal species described so far. Here, we show that, unlike the rest of animals, planarians and possibly other flatworms as well completely lack centrosomes. We found that in planarians, centrioles are only assembled in terminally differentiating ciliated cells through a so-called acentriolar pathway to trigger the assembly of cilia. This unique characteristic allowed us to identify a large set of conserved proteins required for centriole assembly in animals, as well as the centrosome signature proteins missing from the planarian genome. Our study uncovers the molecular architecture and evolution of the animal centrosome and emphasizes the plasticity of animal cell biology and development.
DOI: 10.1083/jcb.200908114
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